Special Purpose Devices

Magnetic Digital Position Sensor Montage (hall effect sensor, hall sensor, hall effect current sensor)

This section includes products developed for very specific application needs.  Please consult with your local Allegro Field Applications Engineer to confirm if one of these products is the best choice for your design.

Continuous-time devices have generally been superseded by chopper-stabilized implementations.  However, there are a few specialized applications where continuous-time switches or latches might be appropriate:

  • Applications where the sensor is power-managed by switching its power supply on and off, as continuous-time devices have faster wake-up times
  • High-speed applications that demand the absolute lowest jitter or best repeatability, as there is no jitter produced by the action of the multiphase chopping

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

 

Certain latch products (A1225, A1227, A1229) are designed to survive very harsh automotive transient conditions, including double battery and 40 V load dump, without a limiting series resistor, eliminating the need for external components and preventing damage from transients. In general, our mainstream latch products are recommended for all new designs, but these products may be appropriate in cases of extremely harsh environments and/or where external components are not permissible.

EMC-Robust Chopper-Stabilized Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A1225 140 to 300 -300 to -140 340 to 540 L LT, UA Open Drain
A1227 50 to 175 -175 to -50 100 to 350 L LT, UA Open Drain
A1229 80 to 200 -80 to -200 160 to 400 L LT, 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 

 

Continuous-Time Latches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A1210 25 to 150 -150 to -25 >50 (typ 180) E, L LH, UA Open Drain UGN3177
A1211 15 to 180 -180 to -15 >80 (typ 180) L UA Open Drain UGN3175
A1212 50 to 175 -175 to -50 100 to 350 L LH, UA Open Drain A3187
A1213 80 to 200 -200 to -80 160 to 400 L LH, UA Open Drain A3188, A3189
A1214 140 to 300 -300 to -140 280 to 600 L LH, UA Open Drain A3185
Continuous-Time Unipolar Switches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temperature Ranges Packages Output Replaces
A1101 30 to 175 10 to 140 20 to 80 E, L LH, UA Open Drain A3141
A1102 115 to 245 60 to 190 30 to 80 E, L LH, UA Open Drain A3142
A1103 205 to 355 150 to 300 30 to 80 E, L LH, UA Open Drain A3143
A1104 35 to 450 25 to 430 >20 E, L LH, UA Open Drain A3144
A1106 260 to 430 160 to 330 70 to 140 E, L LH, UA Open Drain A3121, A3122, A3123
Continuous-Time Bipolar Hall-Effect Switches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temp. Ranges Packages Output Replaces
A1202  <75  >-75  >30  L  UA UGx3133
A1203  <95  >-95  >30  E, L  LH, UA UGx3132
A1205  -40 to 50  -50 to 40  5 to 55  L  LH, UA A3134
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 

 

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

A3230

.

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