Unipolar Hall-Effect Switches

temperature switch, hall sensor, hall effect switchesHall-effect switches are most commonly used in sensing absolute position or proximity, because they require a south pole of sufficient strength to turn the output on and then removal of that field to turn the output off. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of automotive applications. Typical applications include: shift selectors, wiper end/home position, door ajar/open, and vane-interrupt systems. Allegro also offers a wide selection of two-wire devices, which are often used in safety critical applications, such as seat belt buckle and seat position sensing.

Specific advantages of Allegro’s solutions include:

  • 4× chopper stabilization for superior temperature stability and resistance to physical stress
  • 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
  • Designed to survive harsh automotive environments

Allegro has a broad range of devices sensitivities that cover just about any application requirement.

Solutions using temperature switches, Hall-effect switches, and magnetic sensor IC switches

General Purpose Chopper-Stabilized Switches
Part Number Operate Point (G) Release Point (G) Hysteresis (G) Temperature Ranges Packages Output Replaces
A1120 <50 (typ 35) >5 (typ 25) Typ 10 E, L LH, UA Open Drain A3240
A1121 <120 >40 >10 Typ 25 E, L LH, UA Open Drain A3241
A1122 <205 >105 >10 Typ 25 E, L LH, UA Open Drain A3242
A1123 <355 >150 >30 Typ 55 E, L LH, UA Open Drain n/a
A1125 <50 (typ 35) >5 (typ 25) Typ 10 E, L LH, UA Open Drain A3340
A1126 <|55| <|50| 5 to 30 L LH, UA Open Drain A3245
Chopper-Stabilized Switches with Integrated Diagnostics
A1160 <245 >60 Typ 55 L LH Open Drain User-enabled self-diagnostics
A1162
5 to 250 >60 5 to 65 L LE Open Drain Programmable, user-enabled self diagnostics
General Purpose Low Voltage Switches
New as of Aug 2016
APS11205
<50 (typ 35)
>5 (typ 25)
Typ 10
L LH, UA Open Drain Low Voltage Version of A1120
Fixed-Switchpoint Two-Wire Chopper-Stabilized Switches
A1150 <110 >45 5 to 30 L LH, UA Current Source A1140
A1152 <110 >45 5 to 30 L LH, UA, UB
Current Source A3361, A1142
A1153 <110 >45 5 to 30 L LH, UA, UB
Current Source A3163, A3362, A1143
A1155 20 to 60 10 to 55 5 to 30 L LH, UA, UB
Current Source A1145
A1156 20 to 60 10 to 55 5 to 30 L LH, UA, UB
Current Source A1146
A1157 20 to 80 10 to 60 5 to 30 L LH, UA Current Source A1147
A1158 20 to 80 10 to 60 5 to 30 L LH, UA Current Source A1148
User-Programmable Chopper-Stabilized Switches
A1190 10 to 200   5 to 30 L LH, UA, UB
Current Source A1180
A1192 10 to 200 5 to 30 L LH, UA, UB Current Source
A1182, A1185
A1192-F
10 to 200

5 to 30
L LH, UA, UB
Current Source
Ferrite Tc Option
A1193 10 to 200 5 to 30 L LH, UA, UB
Current Source
A1183, A1186
A1193-F
10 to 200

5 to 30
L LH, UA, UB
Current Source
Ferrite Tc Option
A1128 20 to 650
-650 to -20
5 to 30 L UA 3-Wire
Commercial-Grade Unipolar Switches
A3295 <75 >5 Typ 10 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

Back-Biased Chopper-Stabilized Switches
Part Number Supply Voltage (V) Output Type Power-On State Specified Air Gap Range (>20 Hz) Key Spec Min. Speed Packages
ATS128
4.2 to 24 3-wire TPO 2.5 mm max User programmable switch point Zero speed SE

 

 

Continuous-time devices are also available for those specific applications that call for them.  See Continuous-Time Unipolar Switches

The following Hall-effect unipolar switches have been discontinued: A1140, A1142, A1143, A1145, A1146, A1147, A1148A1180, A1181, A1182, A1183, A1184, A1185, A1186, A3161, A3163, A3245, A3250, A3251

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