A3144

Part: Allegro MicroSystems, Inc. A3141 THRU A3144

Type: Sensitive Hall-Effect Switch

Description: Sensitive Hall-effect switches designed for high-temperature operation, featuring 4.5–24 V operation, an open-collector 25 mA output, and continuous operation up to +150 °C.

Operating Conditions:

• Supply voltage: 4.5–24 V
• Operating temperature: -40 °C to +150 °C
• Unipolar switching characteristic

Absolute Maximum Ratings:

• Max supply voltage: 28 V
• Max continuous current: 25 mA
• Max junction/storage temperature: +170 °C

Key Specs:

• Supply Voltage (VCC): 4.5 V (Min) to 24 V (Max)
• Output Saturation Voltage (VOUT(SAT)): 400 mV (Max) at IOUT = 20 mA, B > BOP
• Output Leakage Current (IOFF): <1.010 μA (Typ) at VOUT = 24 V, B < BRP
• Supply Current (ICC): 9.0 mA (Max) at B < BRP (Output OFF)
• Output Rise Time (tr): 2.0 μs (Max) at RL = 820 Ω, CL = 20 pF
• Output Fall Time (tf): 2.0 μs (Max) at RL = 820 Ω, CL = 20 pF
• Operate Point (BOP): 5 G to 450 G (over operating temp. range, varies by variant)
• Release Point (BRP): 10 G to 430 G (over operating temp. range, varies by variant)

Features:

• Superior Temp. Stability for Automotive or Industrial Applications
• 4.5 V to 24 V Operation
• Open-Collector 25 mA Output
• Reverse Battery Protection
• Activate with Small, Commercially Available Permanent Magnets
• Solid-State Reliability
• Small Size
• Resistant to Physical Stress

Applications:

• Use with a simple bar or rod magnet
• Automotive and industrial applications

Package:

• -LT (miniature SOT-89/TO-243AA)
• -U (three-lead plastic mini-SIP)
• -UA (three-lead ultra-mini-SIP)

• ■ Superior Temp. Stability for Automotive or Industrial Applications
• ■ 4.5 V to 24 V Operation … Needs Only An Unregulated Supply
• ■ Open-Collector 25 mA Output … Compatible with Digital Logic
• ■ Reverse Battery Protection
• ■ Activate with Small, Commercially Available Permanent Magnets
• ■ Solid-State Reliability
• ■ Small Size
• ■ Resistant to Physical Stress

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

A3141ELT

.

9.0mA

• Reverse Battery Voltage, V RCC ........... -35 V
• Magnetic Flux Density, B .......... Unlimited
• Output OFF Voltage, V OUT .................. 28 V
• Reverse Output Voltage, V OUT ........... -0.5 V
• Continuous Output Current, I OUT ...... 25mA
• Operating Temperature Range, T A
• Suffix 'E-' .................. -40 ° C to +85 ° C
• Suffix 'L-' ................ -40 ° C to +150 ° C
• Storage Temperature Range,
• T S .............................. -65 ° C to +170 ° C

These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150 ° C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. The four basic devices (3141, 3142, 3143, and 3144) are identical except for magnetic switch points.

Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, smallsignal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with bipolar or CMOS logic circuits. The A3141- and A3142- are improved replacements for the UGN/UGS3140-; the A3144- is the improved replacement for the UGN/UGS3120-.

The first character of the part number suffix determines the device operating temperature range. Suffix 'E-' is for the automotive and industrial temperature range of -40 ° C to +85 ° C. Suffix 'L-' is for the automotive and military temperature range of -40 ° C to +150 ° C. Three package styles provide a magnetically optimized package for most applications. Suffix '-LT' is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; suffix '-U' is a three-lead plastic mini-SIP, while suffix '-UA' is a three-lead ultra-mini-SIP.