Hall-Effect Latches and Bipolar Switches

mangentic latch, hall effect switch, magnetic switch sensorHall-effect latches and bipolar switches are most commonly used in sensing multipole ring magnets for speed sensing, motor commutation, or position encoding, because these require a south pole of sufficient strength to turn the output on and a north pole of sufficient strength to turn the output off. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of automotive applications.

Specific advantages of Allegro’s solutions include:

  • 4× chopper stabilization for superior temperature stability and resistance to physical stress
  • Symmetrical switchpoints for true latch behavior
  • Industry-leading jitter performance that is 2× better than competitor devices
  • Low-voltage (3 V) operation
  • Key performance characteristics specified over the full operating voltage and ambient temperature ranges

Allegro is a market leader in the area of Hall latches, and has a broad range of devices that cover any desired magnetic switchpoints for just about any application requirement.

Solutions using Hall-effect switches, magnetic latches, and magnetic switch sensor ICs

General Purpose Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A1220 5 to 40 -40 to -5 Typ 45 E, L LH, UA Open Drain A3280
A1221 15 to 90 -90 to -15 Typ 100 E, L LH, UA Open Drain A3281
A1222 70 to 150 -150 to -70 Typ 220 E, L LH, UA Open Drain
A1223 100 to 180 -180 to -100 Typ 300 E, L LH, UA Open Drain A3283
A1260 5 to 50 -50 to 5 Typ 50 E, L LH, UA Open Drain Vertical Hall
General Purpose Low Voltage Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
New as of June 2016
APS12205

5 to 40

-40 to -5

Typ 45

L

LH, UA

Open Drain

Low Voltage Version of A1220

New as of June 2016
APS12215

15 to 90 -90 to -15 Typ 100
L LH, UA Open Drain

Low Voltage Version of A1221

New as of June 2016
APS12235
*
100 to 180 -180 to -100 Typ 300
L LH, UA
Open Drain
Low Voltage Version of A1223
Two-Wire Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A1244

5 to 80

-80 to -5

40 to 110

L

LH, UA

Current Source

A1245 5 to 40 -40 to -5 15 to 65 L LH, UA Current Source

Bipolar Hall-Effect Switches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
 A1250  -10 to 25  -25 to 10  5 to 25  L  LH, UA Open Drain A3230
Commercial-Grade Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A3290 5 to 50 -50 to -5 10 to 100 K LH, UA Open Drain
A3291 10 to 100 -100 to -10 20 to 100 K LH, UA Open Drain
 Temperature range codes: S = -20°C to 85°C, E = -40°C to 85°C, K = -40°C to 125°C, L = -40°C to 150°C 

 

*Contact Allegro for availability

Certain special-purpose latches are designed to survive very harsh transients without external components.  See EMC-Robust Chopper-Stabilized Latches.  Continuous-time devices are also available for those specific applications that call for them.  See Continuous-Time Latches

The following Hall-effect latches and bipolar switches have been discontinued:

A3230

.

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