A3425

A3425 ALLEGRO

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A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com Allegro MicroSystems, Inc. AB SO LUTE MAX I MUM RAT INGS Output Sink Current, IOUTPUT(SINK). Internally Limited Operating Temperature Ambient, T

• Two matched Hall effect switches on a single substrate
• Sensor element spacing approximately 1 mm
• Superior temperature stability
• 3.3 V to 18 V operation
• Integrated ESD diode from OUTPUT and VCC pins to GND
• High-sensitivity switchpoints
• Robust structure for EMC protection
• Solid-state reliability The A3425 is a dual-output channel, bipolar switch with two separate Hall-effect sensor circuits, each providing a separate digital output for speed and direction signal processing capability. Each sensor circuit has its own independent Hall element, which are photolithographically aligned to better than 1 µm. Maintaining accurate mechanical location between the two active Hall elements eliminates the major manufacturing hurdle encountered in fi ne-pitch detection applications. The A3425 is a highly sensitive, temperature-stable magnetic sensing device, which is ideal for use in ring magnet-based speed and direction systems used in harsh automotive and industrial environments. The A3425 monolithic integrated circuit contains two independent Hall effect switches, located approximately 1 mm apart. The digital outputs are 90º out of phase so that the outputs are in quadrature with the proper ring magnet design. This allows for easy processing of speed and direction signals. Extremely low- drift amplifi ers guarantee symmetry between the switches to maintain signal quadrature. The patented chopper stabilization technique cancels offsets in each channel, and provides stable operation over the operating temperature and voltage ranges. An on-chip regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming provides sensitive switchpoints that are symmetrical between the two switches. The A3425 is available in a plastic 8-pin SOIC surface mount package and a plas- tic 4-pin SIP, both in two temperature ranges. Each package is available in a lead (Pb) free version with 100% matte tin plated leadframe. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch VCC OUTPUTA OUTPUTB GND No connection No connection No connection No connection Package L, 8-pin SOIC Package K, 4-pin SIP 1 2 3 4 1. VCC 2. OUTPUTA 3. OUTPUTB 4. GND Features and Benefi ts

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Amp Output Drive Amp Output Drive 4B i t s 4B i t s Regulator Programmable Trim OUTPUTA OUTPUTB VCC 8B i t s Sample and Hold Dynamic Offset Cancellation Sample and Hold Dynamic Offset Cancellation Pass Filter Low- Pass Filter Low- GND Functional Block Diagram Terminal List Symbol Description Package KL VCC Connects power supply to on-chip voltage regulator 1 1 OUTPUTA Output from fi rst Schmitt circuit 2 2 OUTPUTB Output from second Schmitt circuit 3 3 GND Ground 4 4 – No connection – 5, 6, 7, 8

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 *Contact Allegro for additional packing options. Part Number Pb-free Packing* Mounting Ambient, T A A3425EK – Bulk, 98 pieces/bag 4-pin SIP through hole –40ºC to 85ºC A3425EK-T Yes Bulk, 98 pieces/bag A3425EKTN – 13-in. reel, 4000 pieces/reel A3425EKTN-T Yes 13-in. reel, 4000 pieces/reel A3425EL – Bulk, 500 pieces/bag 8-pin SOIC surface mount A3425EL-T Yes Bulk, 500 pieces/bag A3425ELTR – 13-in. reel, 3000 pieces/reel A3425ELTR-T Yes 13-in. reel, 3000 pieces/reel A3425LK – Bulk, 98 pieces/bag 4-pin SIP through hole –40ºC to 150ºC A3425LK-T Yes Bulk, 98 pieces/bag A3425LKTN – 13-in. reel, 4000 pieces/reel A3425LKTN-T Yes 13-in. reel, 4000 pieces/reel A3425LL – Bulk, 500 pieces/bag 8-pin SOIC surface mount A3425LL-T Yes Bulk, 500 pieces/bag A3425LLTR – 13-in. reel, 3000 pieces/reel A3425LLTR-T Yes 13-in. reel, 3000 pieces/reel Product Selection Guide

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 OPERATING CHARACTERISTICS Valid over operating temperature ranges unless otherwise noted; typical data applies to VCC = 12 V, and TA = 25ºC Characteristic Symbol Test Conditions Min. Typ. Max Units

ELECTRICAL CHARACTERISTICS

Supply Voltage1 VCC Operating; TA ≤ 150°C 3.3 – 18 V Output Leakage Current I OUTPUT(OFF) Either output – < 1 10 µA Output Rise Time t r CLOAD = 20 pF, RLOAD = 820 Ω – 110 – ns Output Fall Time t f CLOAD = 20 pF, RLOAD = 820 Ω –5 5 – n s Supply Current ICC(OFF) B < BRP(A) ,B < BRP(B) – 3.5 6.0 mA ICC(ON) B > BOP(A) ,B > BOP(B) – 4.0 6.0 mA Low Output Voltage V OUTPUT(ON) Both outputs; IOUTPUT(SINK) = 20 mA; B > BOP(A), B > BOP(B) – 160 500 mV Output Sink Current I OUTPUT(SINK) – – 20 mA Output Sink Current, Continuous2 IOUTPUT(SINK)C TJ < TJ(max) ,VOUTPUT = 12 V – – 70 mA Output Sink Current, Peak3 IOUTPUT(SINK)P t < 3 seconds – – 220 mA Chopping Frequency f C – 340 – kHz TRANSIENT PROTECTION CHARACTERISTICS Supply Zener Voltage V Z ICC = 15 mA 28 33 37 V Supply Zener Current4 IZ VS = 28 V – – 9.0 mA Reverse-Battery Current I RCC VRCC = –18 V, TJ < TJ(max) – 2 15 mA Continued on the next page...

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 MAGNETIC CHARACTERISTICS, K Package5 Operate Point: B > BOP BOP(A), BOP(B) – 7 35 G Release Point: B < BRP BRP(A), BRP(B) –35 –7 – G Hysteresis: BOP(A) – BRP(A), BOP(B) – BRP(B) BHYS(A), BHYS(B) 51 64 0 G Symmetry: Channel A, Channel B, BOP(A) + BRP(A), BOP(B) + BRP(B) SYMA, SYMB –40 – 40 G Operate Symmetry: BOP(A) – BOP(B) SYMAB(OP) –30 – 30 G Release Symmetry: BRP(A) – BRP(B) SYMAB(RP) –30 – 30 G MAGNETIC CHARACTERISTICS, L Package5 Operate Point: B > BOP BOP(A), BOP(B) – 7 30 G Release Point: B < BRP BRP(A), BRP(B) –30 –7 – G Hysteresis: BOP(A) – BRP(A), BOP(B) – BRP(B) BHYS(A), BHYS(B) 51 43 5 G Symmetry: Channel A, Channel B, BOP(A) + BRP(A), BOP(B) + BRP(B) SYMA, SYMB –35 – 35 G Operate Symmetry: BOP(A) – BOP(B) SYMAB(OP) –25 – 25 G Release Symmetry: BRP(A) – BRP(B) SYMAB(RP) –25 – 25 G 1 When operating at maximum voltage, never exceed maximum junction temperature, TJ(max). Refer to power derating curve charts. 2 Device will survive the current level specifi ed, but operation within magnetic specifi cation cannot be guaranteed. 3 Short circuit of the output to VCC is protected for the time duration specifi ed. 4 Maximum specifi cation limit is equivalent to ICC(max) + 3 mA. 5 Magnetic fl ux density, B, is indicated as a negative value for north-polarity magnetic fi elds, and as a positive value for south-polarity magnetic fi elds. This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the fi eld is indicated by the absolute value of B, and the sign indicates the polarity of the fi eld (for example, a –100 G fi eld and a 100 G fi eld have equivalent strength, but opposite polarity). OPERATING CHARACTERISTICS (continued) Valid over operating temperature ranges unless otherwise noted; typical data applies to VCC = 12 V, and TA = 25ºC Characteristic Symbol Test Conditions Min. Typ. Max Units EMC Contact Allegro MicroSystems for EMC performance.

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions Value Units Package Thermal Resistance RθJA Package K, minimum-K PCB (single-sided with copper limited to solder pads) 177 ºC/W Package L, minimum-K PCB (single-sided with copper limited to solder pads) 140 ºC/W Package L, high-K PCB (multilayer with signifi cant copper areas, based on JEDEC standard) 80 ºC/W 20 40 60 80 100 120 180 140 160 Temperature (ºC) Maximum Allowable VCC (V) TJ(max) = 165ºC; ICC =I CC(max) Power Derating Curve (RθJA = 140 ºC/W) Minimum-K PCB, Package L (RθJA = 177 ºC/W) Minimum-K PCB, Package K (RθJA = 80 ºC/W) High-K PCB, Package L VCC(min) VCC(max) 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 Temperature, TA (°C) Power Dissipation, PD (mW) Power Dissipation versus Temperature θJA = 140 ºC/W) Minimum-K PCB, Package L θJA =1 77 ºC/W) Minimum-K PCB, P ackage K θJA =8 0 ºC/W) High -K PCB, Packa ge L

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Functional Description Chopper-Stabilized Technique When using Hall effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset that can be produced at the output of the Hall device. This makes it diffi cult to process the signal and maintain an accurate, reliable output over the specifi ed tem- perature and voltage range. Chopper stabilization is a unique approach used to minimize Hall offset on the chip. The patented Allegro technique, dynamic quadrature offset can- cellation, removes key sources of the output drift induced by thermal and mechanical stress. This offset reduction technique is based on a signal modulation- demodulation process. The undesired offset signal is separated from the magnetically induced signal in the frequency domain through modulation. The subse- quent demodulation acts as a modulation process for the offset, causing the magnetically-induced signal to recover its original spectrum at the baseband level, while the dc offset becomes a high-frequency signal. Then, using a low-pass fi lter, the signal passes while the modulated dc offset is suppressed. The chopper stabilization technique uses a 170 kHz high-frequency clock. The Hall element chopping occurs on each clock edge, resulting in a 340 kHz chop frequency. This high-frequency operation allows for a greater sampling rate, which produces higher accuracy and faster signal processing capability. This approach desensitizes the chip to the effects of ther- mal and mechanical stress. The disadvantage to this approach is that jitter, also known as 360° repeatability, can be induced on the output signal. The sample-and- hold process, used by the demodulator to store and recover the signal, can slightly degrade the signal-to- noise ratio. This is because the process generates rep- licas of the noise spectrum at the baseband, causing a decrease in jitter performance. However, the improve- ment in switchpoint performance, resulting from the reduction of the effects of thermal and mechanical stress, outweighs the degradation in the signal-to-noise ratio. This technique produces devices that have an extremely stable quiescent Hall element output volt- age, are immune to thermal stress, and have precise recoverability after temperature cycling. This tech- nique is made possible through the use of a BiCMOS process, which allows the use of low-offset and low-noise amplifi ers in combination with high-density logic integration and sample-and-hold circuits. This process is illustrated in the following diagram. Chopper stabilization circuit (dynamic quadrature offset cancellation) Amp Regulator Low- Pass Filter Sample and Hold

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Typical Applications Operation Quadrature output signal confi guration. The outputs of the two output channels have a phase difference of 90º when used with a properly designed magnet that has an optimal pole pitch of twice the Hall ele- ment spacing of 1.0 mm. BOP BRP BHYS VOUTPUT(OFF) VOUTPUT VOUTPUT(ON)(sat) Switch to Low Switch to High Output voltage in relation to sensed magnetic fl ux density. Output on each channel independently follows the same pattern of transition through B OP followed by transition through BRP. Output Sensor B Output Sensor A Magnetic Field Sensor A Magnetic Field Sensor B

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Regulated supply

1 A3425

0.1 uF VOUTPUTB VOUTPUTA OUTPUTA OUTPUTB GND VCC 0.1 uF 100 Ω This device requires minimal protection circuitry during operation with a low-voltage regulated line. The on-chip voltage regulator provides immunity to power supply variations between 3.3 and 18 V . Because the device has open-collector outputs, pull- up resistors must be included. If protection against coupled and injected noise is required, then a simple low-pass fi lter on the supply (RC) and a fi ltering capacitor on each of the outputs may also be needed, as shown in the unregulated supply diagram. For applications in which the device receives its power from unregulated sources, such as a car bat- tery, full protection is generally required to protect the device against supply-side transients. Specifi cations for such transients vary for each application, so the design of the protection circuit should be optimized for each application. For example, the circuit shown in the unregulated supply diagram includes a Zener diode that offers high voltage load-dump protection and noise fi ltering by means of a series resistor and capacitor. In addi- tion, it includes a series diode that protects against high-voltage reverse battery conditions. Unregulated supply Typical Applications Circuits

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Typical Thermal Performance The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating sup- plied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating T J. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RθJA, is a fi gure of merit sum- marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, R θJC, is relatively small component of RθJA. Ambient air temperature, TA, and air motion are signifi cant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate T J, at PD. PD = VIN × IIN (1) ∆ T = PD × RθJA (2) T J = TA + ∆T (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then: P D = VCC × ICC = 12 V × 4 mA = 48 mW ∆ T = PD × RθJA = 48 mW × 140 °C/W = 7°C A worst-case estimate, PD(max), represents the maximum allow- able power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RθJA and TA. Example: Reliability for VCC at TA = 150°C, package L, using minimum-K PCB Observe the worst-case ratings for the device, specifi cally: RθJA = 140 °C/W, TJ(max) = 165°C, VCC(max) = 18 V , and ICC(max) = 6 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ∆Tmax = TJ(max) – TA = 165 °C – 150 °C = 15 °C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = ∆Tmax ÷ RθJA = 15°C ÷ 140 °C/W = 107 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 107 mW ÷ 6 mA = 18 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli- able operation between VCC(est) and VCC(max) requires enhanced RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Electrical Operating Characteristics, Package L ICC(off) -50 0 50 100 150 200 Temperature (°C) Current (mA) 3.3 V 18 V 0 5 10 15 20 VCC (V) Current (mA) -40°C 25°C 150°C ICC(on) -50 0 50 100 150 200 Temperature (°C) Current (mA) 3.3 V 18 V 0 5 10 15 20 VCC (V) Current (mA) -40°C 25°C 150°C VCC = 3.3 V, Isink = 20 mA 100 200 300 400 500 -50 0 50 100 150 200 Ch. A Ch. B Vsat (mV) Output Saturation Voltage ICC(off) ICC(on) Temperature (°C)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package L Additional magnetic characteristics on next page Channel A, BOP and BRP -30 -20 -10 0 5 10 15 20 Switchpoint (G) -40°C 25°C 150°C -30 -20 -10 -50 0 50 100 150 200 Switchpoint (G) 3.3 V 12 V 18 V Channel B, BOP and BRP -30 -20 -10 0 5 10 15 20 Switchpoint (G) -40°C 25°C 150°C Channel B, BOP and BRP -30 -20 -10 -50 0 50 100 150 200 Switchpoint (G) 3.3 V 12 V 18 V Channels A and B, Hysteresis 0 5 10 15 20 BOP - BRP (G) -40°C 25°C 150°C Channels A and B, Hysteresis -50 0 50 100 150 200 BOP - BRP (G) 3.3 V 12 V 18 V Channel A, BOP and BRP BOP BRP BOP BRP BOP BRP BOP BRP VCC (V) Temperature (°C) VCC (V) Temperature (°C) VCC (V) Temperature (°C)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package L (continued) Additional magnetic characteristics on next page BOP Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) Ch. A - Ch. B (G) -40°C 25°C 150°C BOP Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) Ch. A - Ch. B (G) 3.3 V 12 V 18 V BRP Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) Ch. A - Ch. B (G) -40°C 25°C 150°C BRP Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) Ch. A - Ch. B (G) 3.3 V 12 V 18 V

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package L (continued) Ch. A Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) BOP + BRP (G) -40°C 25°C 150°C Ch. A Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) BOP + BRP (G) 3.3 V 12 V 18 V Ch. B Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) BOP + BRP (G) -40°C 25°C 150°C Ch. B Symmetry 3.3 V 12 V 18 V -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) BOP + BRP (G)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Electrical Operating Characteristics, Package K ICC(off) -50 0 50 100 150 200 Temperature (°C) Current (mA) 3.3 V 18 V 0 5 10 15 20 VCC (V) Current (mA) -40°C 25°C 150°C ICC(on) -50 0 50 100 150 200 Temperature (°C) Current (mA) 3.3 V 18 V 0 5 10 15 20 VCC (V) Current (mA) -40°C 25°C 150°C ICC(off) ICC(on) VCC = 3.3 V, Isink = 20 mA 100 200 300 400 500 -50 0 50 100 150 200 Ch. A Ch. B Vsat (mV) Output Saturation Voltage Temperature (°C)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package K Additional magnetic characteristics on next page Channel A, BOP and BRP -30 -20 -10 0 5 10 15 20 Switchpoint (G) -40°C 25°C 150°C -30 -20 -10 -50 0 50 100 150 200 Switchpoint (G) 3.3 V 12 V 18 V Channel B, BOP and BRP -30 -20 -10 0 5 10 15 20 Switchpoint (G) -40°C 25°C 150°C Channel B, BOP and BRP -30 -20 -10 -50 0 50 100 150 200 Switchpoint (G) 3.3 V 12 V 18 V Channels A and B, Hysteresis 0 5 10 15 20 BOP - BRP (G) -40°C 25°C 150°C Channels A and B, Hysteresis -50 0 50 100 150 200 BOP - BRP (G) 3.3 V 12 V 18 V Channel A, BOP and BRP BOP BRP BOP BRP BOP BRP BOP BRP VCC (V) Temperature (°C) VCC (V) Temperature (°C) VCC (V) Temperature (°C)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package K (continued) Additional magnetic characteristics on next page BOP Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) Ch. A - Ch. B (G) -40°C 25°C 150°C BOP Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) Ch. A - Ch. B (G) 3.3 V 12 V 18 V BRP Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) Ch. A - Ch. B (G) -40°C 25°C 150°C BRP Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) Ch. A - Ch. B (G) 3.3 V 12 V 18 V

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Magnetic Operating Characteristics, Package K (continued) Ch. A Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) BOP + BRP (G) -40°C 25°C 150°C Ch. A Symmetry -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) BOP + BRP (G) 3.3 V 12 V 18 V Ch. B Symmetry -30 -20 -10 0 5 10 15 20 VCC (V) BOP + BRP (G) -40°C 25°C 150°C Ch. B Symmetry 3.3 V 12 V 18 V -30 -20 -10 -50 0 50 100 150 200 Temperature (°C) BOP + BRP (G)

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Package K, 4-pin SIP

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 Package L, 8-pin SOIC

A3425DS-Rev. ! Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A3425 The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical compo- nents in life-support devices or sys tems without express written approval. The in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon - si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. Copyright © 2005, Allegro MicroSystems, Inc.