A1121LUA-T

A1120_16 ALLEGRO | Alldatasheet

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Technical content

DESCRIPTION

The A1120, A1121, A1122, A1123, and A1125 Hall-effect unipolar switches are extremely temperature-stable and stress-resistant sensor ICs, especially suited for operation over extended temperature ranges to 150°C. Superior high- temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output to sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3 to 24 V . The advantage of operating down to 3 V is that the device can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high-voltage transient events. For the A1120, A1121, A1122, and A1123, a south pole of sufficient strength turns the output on. Removal of the magnetic field turns the output off. The A1125 is complementary, in that for these devices, a south pole turns the A1125 output off, and removal of the magnetic field turns the output on. Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface-mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, –T), with a 100% matte-tin-plated leadframe. A1120-DS, Rev. 16 FEATURES AND BENEFITS ▪ AEC-Q100 automotive qualified ▪ Unipolar switchpoints ▪ Resistant to physical stress ▪ Superior temperature stability ▪ Output short-circuit protection ▪ Operation from unregulated supply ▪ Reverse-battery protection ▪ Solid-state reliability ▪ Small package sizes Chopper-Stabilized Precision Hall-Effect Switches Packages: Functional Block Diagram Not to scale A1120, A1121, A1122, A1123, and A1125 3-pin SOT23W (suffix LH) (A1121, A1122, A1123, and A1125) (A1120) 3-pin SIP (suffix UA) Regulator GND VCC VOUT Control Current Limit Dynamic Offset Cancellation Sample and Hold To All Subcircuits Amp Low-Pass Filter

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A. Selection Guide Part Number Packing1 Mounting Ambient, TA Switchpoints (Typ.) Output In South (Positive) Magnetic Field BOP BRP A1120ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 85ºC 35 25 On (logic low) A1120ELHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1120EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1120LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 150ºCA1120LLHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1120LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1121ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 85ºC 95 70 A1121ELHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1121EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1121LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 150ºCA1121LLHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1121LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1122ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 85ºC 150 125 A1122ELHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1122EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1122LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 150ºCA1122LLHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1122LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1123LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 150ºC 280 225A1123LLHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1123LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1125ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 85ºC 35 25 Off (logic high) A1125ELHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1125EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1125LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount –40ºC to 150ºCA1125LLHLT-T2 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount A1125LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 1 Contact Allegro for additional packing options. 2 Available through authorized Allegro distributors only.

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Forward Supply Voltage VCC 26.5 V Reverse Supply Voltage VRCC –30 V Output Off Voltage VOUT 26 V Continuous Output Current IOUT 25 mA Reverse Output Current IROUT –50 mA Operating Ambient Temperature TA Range E –40 to 85 ºC Range L –40 to 150 ºC Maximum Junction Temperature TJ(max) 165 ºC Storage Temperature Tstg –65 to 170 ºC Pin-Out Diagrams Terminal List Name Description Number Package LH Package UA VCC Connects power supply to chip 1 1 VOUT Output from circuit 2 3 GND Ground 3 2 1 32GND VOUT VCC Package UAPackage LH 1 2

3 GND

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. ELECTRICAL CHARACTERISTICS: Valid over full operating voltage and ambient temperature ranges, unless otherwise noted Characteristics Symbol Test Conditions Min. Typ.1 Max. Unit2

Electrical Characteristics

Forward Supply Voltage VCC Operating, TJ < 165°C 3 – 24 V Output Leakage Current IOUTOFF A1120 A1121 A1122 A1123 V OUT = 24 V, B < BRP – – 10 µA A1125 VOUT = 24 V, B > BOP – – 10 µA Output Saturation Voltage VOUT(SAT) A1120 A1121 A1122 A1123 I OUT = 20 mA, B > BOP – 185 500 mV A1125 IOUT = 20 mA, B < BRP – 185 500 mV Output Current Limit IOM A1120 A1121 A1122 A1123 B > B OP 30 – 60 mA A1125 B < BRP 30 – 60 mA Power-On Time3 tPO VCC > 3.0 V, B < BRP(min) – 10 G, B > BOP(max) + 10 G – – 25 µs Chopping Frequency fC – 800 – kHz Output Rise Time3,4 tr RL = 820 Ω, CS = 20 pF – 0.2 2 µs Output Fall Time3,4 tf RL = 820 Ω, CS = 20 pF – 0.1 2 µs Supply Current ICC(ON) A1120 A1121 A1122 A1123 V CC = 12 V, B > BOP – – 4 mA A1125 VCC = 12 V, B < BRP – – 4 mA ICC(OFF) A1120 A1121 A1122 A1123 V CC = 12 V, B < BRP – – 4 mA A1125 VCC = 12 V, B > BOP – – 4 mA Reverse Supply Current IRCC VRCC = –30 V – – –5 mA Supply Zener Clamp Voltage VZ ICC = 5 mA; TA = 25°C 28 – – V Zener Impedance IZ ICC = 5 mA; TA = 25°C – 50 – Ω Continued on the next page…

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. ELECTRICAL CHARACTERISTICS (continued): Valid over full operating voltage and ambient temperature ranges, unless otherwise noted Characteristics Symbol Test Conditions Min. Typ.1 Max. Unit2 Magnetic Characteristics Operate Point BOP A1120 – 35 50 G A1121 50 95 135 G A1122 120 150 200 G A1123 205 280 355 G A1125 – 35 50 G Release Point BRP A1120 5 25 – G A1121 40 70 110 G A1122 110 125 190 G A1123 150 225 300 G A1125 5 25 – G Hysteresis BHYS A1120 (BOP – BRP) – 10 – G A1121 10 25 42 G A1122 10 25 42 G A1123 30 55 80 G A1125 – 10 – G 1 Typical data are are at TA = 25°C and VCC = 12 V, and are for initial design estimations only. 2 1 G (gauss) = 0.1 mT (millitesla). 3 Guaranteed by device design and characterization. 4 CS = oscilloscope probe capacitance.

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information Characteristic Symbol Test Conditions Value Units Package Thermal Resistance RθJA Package LH, 1-layer PCB with copper limited to solder pads 228 ºC/W Package LH, 2-layer PCB with 0.463 in.2 of copper area each side connected by thermal vias 110 ºC/W Package UA, 1-layer PCB with copper limited to solder pads 165 ºC/W 20 40 60 80 100 120 140 160 180 Temperature (ºC) Maximum Allowable VCC (V) TJ(max) = 165ºC; ICC = ICC(max) Power Derating Curve (RθJA = 228 ºC/W) Package LH, 1-layer PCB (RθJA = 110 ºC/W) Package LH, 2-layer PCB (RθJA = 165 ºC/W) Package UA, 1-layer PCB 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 (°C) Power Dissipation, PD (mW) Power Dissipation versus Ambient Temperature θJA = 165 ºC/W) Package UA, 1-layer PCB θJA = 228 ºC/W) Package LH, 1-layer PCB θJA = 110 ºC/W) Package LH, 2-layer PCB

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Characteristic Performance A1120, A1121, A1122, A1123, and A1125 Electrical Characteristics 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 2 6 10 14 18 22 26 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -60 -40 -20 0 20 40 60 80 100 120 140 160 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -60 -40 -20 0 20 40 60 80 100 120 140 160 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 2 6 10 14 18 22 26 100 150 200 250 300 - - - 0 20 40 60 80 100 120 140 160 100 150 200 250 300 2 6 10 14 18 22 2660 40 20 Average Supply Current (On) versus Average Supply VoltageAverage Supply Current (On) versus Ambient Temperature Average Supply Current (Off) versus Average Supply VoltageAverage Supply Current (Off) versus Ambient Temperature Average Output Saturation Voltage versus Supply VoltageAverage Output Saturation Voltage versus Ambient Temperature TA (°C) ICC(av) (mA) ICC(av) (mA) ICC(av) (mA) ICC(av) (mA) VOUT(sat) (V) VOUT(sat) (V) VCC (V) TA (°C) VCC (V) TA (°C) VCC (V) TA (°C) –40 150 VCC (V) 3.0 VCC (V) 3.0 3.8 4.2 A112x* *A1120, A1121, A1122, and A1125 A1123 VCC (V) 3.0 A112x* *A1120, A1121, A1122, and A1125 A1123 A112x* *A1120, A1121, A1122, and A1125 A1123 TA (°C) –40 150 A112x* *A1120, A1121, A1122, and A1125 A1123 TA (°C) –40 150 A112x* *A1120, A1121, A1122, and A1125 A1123 A112x* *A1120, A1121, A1122, and A1125 A1123

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. A1120 and A1125 Magnetic Characteristics -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 2 6 10 14 18 22 26 2 6 10 14 18 22 26 Average Operate Point versus Average Supply VoltageAverage Operate Point versus Ambient Temperature Average Release Point versus Average Supply VoltageAverage Release Point versus Ambient Temperature Average Switchpoint Hysteresis versus Supply VoltageAverage Switchpoint Hysteresis versus Ambient Temperature TA (°C) BOP (G) BOP (G) BRP (G) BRP (G) BHYS (G) BHYS (G) VCC (V) TA (°C) VCC (V) TA (°C) VCC (V) VCC (V) 3.0 VCC (V) 3.0 VCC (V) 3.0 TA (°C) –40 150 TA (°C) –40 150 TA (°C) –40 150

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. A1121 Magnetic Characteristics - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 26- 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 100 110 100 110 120 130 140 100 110 120 130 140 100 110 Average Operate Point versus Average Supply VoltageAverage Operate Point versus Ambient Temperature Average Release Point versus Average Supply VoltageAverage Release Point versus Ambient Temperature Average Switchpoint Hysteresis versus Supply VoltageAverage Switchpoint Hysteresis versus Ambient Temperature TA (°C) BOP (G) BOP (G) BRP (G) BRP (G) BHYS (G) BHYS (G) VCC (V) TA (°C) VCC (V) TA (°C) VCC (V) VCC (V) 3.0 VCC (V) 3.0 VCC (V) 3.0 TA (°C) –40 150 TA (°C) –40 150 TA (°C) –40 150

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. A1122 Magnetic Characteristics - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 26- 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 200 190 180 170 160 150 140 130 120 200 190 180 170 160 150 140 130 120 190 180 170 160 150 140 130 120 110 190 180 170 160 150 140 130 120 110 Average Operate Point versus Average Supply VoltageAverage Operate Point versus Ambient Temperature Average Release Point versus Average Supply VoltageAverage Release Point versus Ambient Temperature Average Switchpoint Hysteresis versus Supply VoltageAverage Switchpoint Hysteresis versus Ambient Temperature TA (°C) BOP (G) BOP (G) BRP (G) BRP (G) BHYS (G) BHYS (G) VCC (V) TA (°C) VCC (V) TA (°C) VCC (V) VCC (V) 3.0 VCC (V) 3.0 VCC (V) 3.0 TA (°C) –40 150 TA (°C) –40 150 TA (°C) –40 150

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. A1123 Magnetic Characteristics 355 350 305 280 255 230 205 355 350 305 280 255 230 205 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 2 6 10 14 18 22 26 2 6 10 14 18 22 26 300 275 250 225 200 175 150 300 275 250 225 200 175 150 Average Operate Point versus Average Supply VoltageAverage Operate Point versus Ambient Temperature Average Release Point versus Average Supply VoltageAverage Release Point versus Ambient Temperature Average Switchpoint Hysteresis versus Supply VoltageAverage Switchpoint Hysteresis versus Ambient Temperature TA (°C) BOP (G) BOP (G) BRP (G) BRP (G) BHYS (G) BHYS (G) VCC (V) TA (°C) VCC (V) TA (°C) VCC (V) TA (°C) –40 150 TA (°C) –40 150 TA (°C) –40 150 TA (°C) TA (°C) TA (°C)

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. CBYP A112x VOUT GND0.1 µF VCC Output RL VS Operation The output of the A1120, A1121, A1122, and A1123 devices switches low (turns on) when a magnetic field perpendicular to the Hall element exceeds the operate point threshold, BOP (see panel A of figure 1). When the magnetic field is reduced below the release point, BRP , the device output goes high (turns off). The output of the A1125 devices switches high (turns off) when a magnetic field perpendicular to the Hall element exceeds the operate point threshold, BOP (see panel B of figure 1). When the magnetic field is reduced below the release point, BRP , the device output goes low (turns on). After turn-on, the output voltage is VOUT(SAT) . The output tran- sistor is capable of sinking current up to the short circuit current limit, IOM, which is a minimum of 30 mA. The difference in the magnetic operate and release points is the hysteresis, B HYS , of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Powering-on the device in the hysteresis range (less than B OP and higher than BRP) will give an indeterminate output state. The correct state is attained after the first excursion beyond BOP or BRP .

Applications

It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall element) between the supply and ground of the device to reduce external noise in the application. As is shown in panel B of figure 1, a 0.1 µF capacitor is typical. Extensive applications information for Hall effect devices is available in:

• Hall-Effect IC Applications Guide, Application Note 27701
• Guidelines for Designing Subassemblies Using Hall-Effect Devices, Application Note 27703.1
• Soldering Methods for Allegro’ s Products – SMT and Through- Hole, Application Note 26009 All are provided on the Allegro Web site, www.allegromicro.com.

Figure 1. Device switching behavior. In panels A and B, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength. This behavior can be exhibited when using an electrical circuit such as that shown in panel C.

Worcester, Massachusetts 01615-0036 U.S.A. temperature and voltage ranges. of the output drift induced by thermal and mechanical stresses. Allegro sales representative. Figure 2. Model of chopper stabilization technique

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Power Derating The device must be operated below the maximum junction temperature of the device, T J(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- cation. This section presents a procedure for correlating factors affecting operating T J. (Thermal data is also available on the Allegro MicroSystems website.) The Package Thermal Resistance, RθJA, is a figure 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 significant 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 TJ, at PD. PD = VIN × IIN (1) ΔT = PD × RθJA (2) TJ = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 1.6 mA, and RθJA = 165 °C/W, then: PD = VCC × ICC = 12 V × 1.6 mA = 19 mW Δ T = PD × RθJA = 19 mW × 165 °C/W = 3°C T J = TA + ΔT = 25°C + 3°C = 28°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 LH, using a minimum-K PCB. Observe the worst-case ratings for the device, specifically: RθJA = 228°C/W, TJ(max) = 165°C, VCC(max) = 24 V , and ICC(max) = 4 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ΔTmax = 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) = ΔTmax ÷ RθJA = 15°C ÷ 228 °C/W = 66 mW Finally, invert equation 1 with respect to voltage: V CC(est) = PD(max) ÷ ICC(max) = 66 mW ÷ 4 mA = 16.5 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.

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A.

0.55 REF

0.25 BSC

0.95 BSC

0.95 1.00 0.70 2.40 A Active Area Depth, 0.28 mm REF B C B Reference land pattern layout All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Branding scale and appearance at supplier discretion A PCB Layout Reference View Branded Face C Standard Branding Reference View N = Last two digits of device part number T = Temperature code (letter) NNT N = Last three digits of device part number NNN 2.90 +0.10 –0.20 4°±4° 8X 10° REF 0.180+0.020 –0.053 0.05 +0.10 –0.05

0.25 MIN

1.91 +0.19 –0.06 2.98 +0.12 –0.08 1.00 ±0.13 0.40 ±0.10 For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown D Hall element, not to scale D D D1.49 0.96 Package LH, 3-Pin (SOT-23W)

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. 2 31

0.79 REF

1.27 NOM

2.16 MAX 0.51 REF 45° C 45° B E E E 2.04 1.44 Gate burr area A B C Dambar removal protrusion (6X) A D E D Branding scale and appearance at supplier discretion Hall element, not to scale Active Area Depth, 0.50 mm REF For Reference Only; not for tooling use (reference DWG-9049) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Standard Branding Reference View = Supplier emblem N = Last two digits of device part number T = Temperature code NNT Mold Ejector Pin Indent Branded Face 4.09 +0.08 –0.05 0.41 +0.03 –0.06 3.02 +0.08 –0.05 0.43 +0.05 –0.07 15.75 ±0.51 1.52 ±0.05 Package UA, 3-Pin SIP (A1120)

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Package UA, 3-Pin SIP (A1121, A1122, A1123, and A1125) 2 31 1.02 MAX 45° 45° C 1.52 ±0.05 B Gate and tie bar burr area A B C Dambar removal protrusion (6X) A D E E E 1.44 2.04 E Active Area Depth, 0.50 mm REF Branding scale and appearance at supplier discretion Hall element (not to scale) For Reference Only; not for tooling use (reference DWG-9065) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Mold Ejector Pin Indent D Standard Branding Reference View = Supplier emblem N = Last three digits of device part number NNN 0.41 +0.03 –0.06 0.43 +0.05 –0.07 14.99 ±0.25 4.09 +0.08 –0.05 3.02 +0.08 –0.05 10° Branded Face

Chopper-Stabilized Precision Hall-Effect Switches A1120, A1121, A1122, A1123, and A1125 Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A.

Revision History

Revision Revision Date Description of Revision

15 September 3, 2013 Update product offerings

16 September 16, 2015 Added AEC-Q100 qualification under Features

Copyright ©2015, Allegro MicroSystems, LLC Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, 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’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.