3134 ALLEGRO

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Technical content

Always order by complete part number, e.g., A3134ELT .

FEATURES

I Superior Temperature Stability I Operation From Unregulated Supply I Open-Collector 25 mA Output I Reverse Battery Protection I Activate With Small, Commercially Available Permanent Magnets I Solid-State Reliability I Small Size I Resistant to Physical Stress This low-hysteresis bipolar Hall-effect switch is an extremely temperature-stable and stress-resistant sensor especially suited for operation over extended temperature ranges to +150°C. Superior high-temperature performance is made possible through a novel Schmitt trigger circuit that maintains operate and release point stability by compensating for temperature changes in the Hall element. Additionally, internal compensation provides magnetic switch points that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature. Its low hysteresis makes this device ideal for detecting small changes in magnetic field strength or for use with inexpensive magnets. The device includes on a single silicon chip a voltage regulator, quadratic Hall-voltage generator, temperature compensation circuit, signal amplifier, Schmitt trigger, and a buffered open-collector output to sink up to 25 mA. The on-board regulator permits operation with supply voltages of 4.5 volts to 24 volts. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix ‘L–’ is -40°C to +150°C. Two package styles provide a magneti- cally optimized package for most applications. Suffix ‘–LT’ is a minia- ture SOT89/TO-243AA transistor package for surface-mount applica- tions while suffix ‘–UA’ is a three-lead ultra-mini-SIP. Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C Continuous Output Current, Operating Temperature Range, TA Storage Temperature Range, Data Sheet27631.4D 3134 BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMPERATURE OPERATION Dwg. PH-003A 1SUPPLY V CC GROUND OUTPUT X

BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP . OPERATION

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating 4.5 — 24 V Output Saturation Voltage V OUT(SAT) IOUT = 20 mA, B > BOP — 175 400 mV Output Leakage Current I OFF VOUT = 24 V, B < BRP — 0.05 1.0 µA Supply Current I CC B < BRP (Output OFF) — 3.2 9.0mA B > BOP (Output ON) — 5.0— mA Output Rise Time t r RL = 820 Ω , CL = 20 pF — 100 — ns Output Fall Time t f RL = 820 Ω , CL = 20 pF — 100 — ns ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. MAGNETIC CHARACTERISTICS over oper. temp. and oper. supply voltage ranges. VCC X REG. Dwg. FH-005-3 GROUND OUTPUT FUNCTIONAL BLOCK DIAGRAM Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Operate Point B OP -408.5 60 G Release Point B RP -50-19 50 G Hysteresis B hys 5.027 55 G Copyright © 1995, 2003 Allegro MicroSystems, Inc. NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). As used here, negative flux densities are defined as less than zero (algebraic convention). Typical values are at TA = +25°C and VCC = 12 V. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).

BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP . OPERATION www.allegromicro.com TYPICAL OPERATING CHARACTERISTICS 0 25 50 75 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-053 125-25 SUPPLY CURRENT IN mA 5.0 4.0 3.0 2.0 1.0 150 V = 12 VCC B < BRP V = 24 VCC V = 4.5 VCC OUTPUT SATURATION VOLTAGE SUPPLY CURRENT 0 25 50 75 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-052 125-25 SWITCH POINT IN GAUSS -20 -40 RELEASE POINT OPERATE POINT 150 CCV = 4.5 V–24 V SWITCH POINTS HYSTERESIS 0 25 50 75 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-051 125-25 HYSTERESIS IN GAUSS 150 CCV = 4.5 V–24 V40 02 5 5 07 5 100 300 AMBIENT TEMPERATURE IN °°°°C 200 100 -50 Dwg. GH-029 SATURATION VOLTAGE IN mV 150-25 125 I = 20 mA V = 4.5–24 V OUT CC

BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP . OPERATION Worcester, Massachusetts 01615-0036 (508) 853-5000 APPLICATIONS INFORMATION Extensive applications information for Hall-effect sensors is available in:

  • Hall-Effect IC Applications Guide, Application Note 27701;
  • Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1;
  • Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703; and
  • Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2. All are provided in Allegro Electronic Data Book, AMS-702. or at www.allegromicro.com OPERATION The output of these devices (pin 3) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (BOP). At this point, the output voltage is VOUT(SAT). When the magnetic field is reduced to below the release point (BRP) the device output goes high. Note especially that release can occur when the magnetic field is removed but to ensure release, a field reversal is required. The difference in the magnetic operate and release points is called the hysteresis (Bhys) 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 up the device in the absence of a magnetic field (less than BOP and higher than BRP) will allow in indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP. Suffix “UA” SENSOR LOCATIONS (±0.005" [0.13 mm] die placement) 1 32 Dw g. MH-011-4C 0.0195" 0.50 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.083" 2.10 mm 0.060" 1.51 mm A Suffix “LT” 1 32 Dw g. MH-008-4C 0.0305" 0.775 mm NOM ACTIVE AREA DEPTH 0.050" 1.27 mm 0.090" 2.27 mm A The products described herein are manufactured under one or more of the following other patents pending. Allegro MicroSystems, Inc. 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 products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringe- ments of patents or other rights of third parties that may result from its use.

BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP . OPERATION www.allegromicro.com PACKAGE DESIGNATOR ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. Dwg. MA-009-3A in 1 23 0.072 0.064 0.167 0.155 0.059 BSC 0.0189 0.01420.047 0.035 0.102 0.090 0.063 0.055 0.0173 0.0138 0.090 0.0840.0221 0.0173 0.118 BSC 0.181 0.173 Dwg. MA-009-3A mm 1 23 4.60 4.40 1.83 1.62 4.25 3.94 1.50 BSC 0.48 0.361.20 0.89 2.60 2.29 1.60 1.40 0.44 0.35 2.29 2.130.56 0.44 3.00 BSC B 0.098 0.031 0.102 0.047 0.181 0.079 Dwg. MA-012-3 in Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.028 TYP 0.031 TYP A 3 13 B 2.5 0.8 2.6 1.2 4.6 2.0 Dwg. MA-012-3 mm Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.7 TYP 0.8 TYP A

BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP . OPERATION Worcester, Massachusetts 01615-0036 (508) 853-5000 Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) PACKAGE DESIGNATOR ‘UA’ NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal. 6. Supplied in bulk pack (500 pieces per bag). Dwg. MH-014E in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 BSC 45° 0.640 0.600 0.0189 0.0142 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE Dwg. MH-014E mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 BSC 45° 16.26 15.24 0.48 0.36 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE Radial Lead Form (order A3240xUA-LC) NOTE: Lead-form dimensions are the nominals produced on the forming equipment. No dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag). 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 0.108" (2.74 mm) 123