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The unipolar Hall-effect switch is characterized by the magnetic operate threshold (Bop). If the Hall cell is exposed to a magnetic flux density greater than the operate threshold, the output transistor is switched on; by dropping below the threshold (Brp), the transistor is switched off. The hysteresis (Bhys) is the difference between the two thresholds (Bop-Brp). This built in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. The digital output from a unipolar Hall-effect can be adapted to various logic systems. These devices are ideal for use with simple bar or rod magnets. Allegro offers a variety of unipolar Hall-effect switches that each have a different operate threshold and hysteresis with respect to the south pole of a magnet.
| Part Number | Operate Point (G) | Release Point (G) | Hysteresis (G) | Temperature Ranges | Packages | Output | Comments |
|---|---|---|---|---|---|---|---|
| A1101 | 30 to 175 | 10 to 140 | 20 to 80 | E, L | LH, UA | Open Collector | Replaces A3141 |
| A1102 | 115 to 245 | 60 to 190 | 30 to 80 | E, L | LH, UA | Open Collector | Replaces A3142 |
| A1103 | 205 to 355 | 150 to 300 | 30 to 80 | E, L | LH, UA | Open Collector | Replaces A3143 |
| A1104 | 35 to 450 | 25 to 430 | >20 | E, L | LH, UA | Open Collector | Replaces A3144 |
| A1106 | 260 to 430 | 160 to 330 | 70 to 140 | E, L | LT, UA | Open Collector | Replaces A3121, A3122, A3123 |
| A1142 | <115 | >45 | 5 to 30 | E, L | LH, UA | Current Source | Replaces A3361 |
| A1143 | <115 | >45 | 5 to 30 | E, L | LH, UA | Current Source | Replaces A3163, A3362 |
| A1145 | 20 to 60 | 10 to 55 | 5 to 30 | E, L | LH, UA | Current Source | |
| A1146 | 20 to 60 | 10 to 55 | 5 to 30 | E, L | LH, UA | Current Source | |
| A1147 | 20 to 80 | 10 to 60 | 5 to 30 | E, L | LH, UA | Current Source | |
| A1148 | 20 to 80 | 10 to 60 | 5 to 30 | E, L | LH, UA | Current Source | |
| A1180 | 60 to 200 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1181 | 60 to 200 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1182 | 60 to 200 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1183 | 60 to 200 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1184 | 300 to 600 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1185 | 10 to 60 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A1186 | 10 to 60 | 5 to 30 | E, L | LH, UA | Current Source | ||
| A3240 | <50 (typ 35) | >5 (typ 25) | Typ 10 | E, L | LH, LT, UA | Open Collector | Chopper-stabilized |
| A3241 | <120 | >40 | >10 Typ 25 | E, L | LH, UA | Open Collector | Chopper-stabilized |
| A3242 | <205 | >105 | >10 Typ 25 | E, L | LH, UA | Open Collector | Chopper-stabilized |
| A3250 | 50 to 350 | Typ 13 G below Bop | 5< 13-18 Typ <35 | E, L | LH, UA | Open Collector | Programmable switchpoints |
| A3251 | 50 to 350 | Typ 13 G below Bop | 5< 13-18 Typ <35 | E, L | LH, UA | Open Collector | Programmable switchpoints |
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