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发布时间：2007-07-14 浏览：7008次
The Hall-effect digital latches will always switch on with a south magnetic of sufficient strength and switch off with a north magnetic field of sufficient strength. The output will not change if the magnetic field is removed. To change the output state, the opposite magnetic field polarity must be applied. Allegro offers a variety of latching Hall-effect switches each with a different operate threshold (Bop) with respect to the south pole of a magnet and an release threshold (Brp) with the opposite value in respect to the north pole of a magnet.
| Part Number | Operate Point (G) | Release Point (G) | Hysteresis (G) | Temperature Ranges | Packages | Output | Comments |
|---|---|---|---|---|---|---|---|
| A1210 | 25 to 150 | -150 to -25 | >50 (typ 180) | E, L | LH, UA | Open Collector | Replaces UGN3177 |
| A1211 | 15 to 180 | -180 to -15 | >80 (typ 180) | E, L | LH, UA | Open Collector | Replaces UGN3175 |
| A1212 | 50 to 175 | -175 to -50 | 100 to 350 | E, L | LH, UA | Open Collector | Replaces A3187 |
| A1213 | 80 to 200 | -200 to -80 | 160 to 400 | E, L | LH, UA | Open Collector | Replaces A3188, A3189 |
| A1214 | 140 to 300 | -300 to -140 | 280 to 600 | E, L | LH, UA | Open Collector | Replaces A3185 |
| A1242 | 5 to 80 | -80 to -5 | 40 to 110 | E, L | LH, UA | Current Source | Two-wire operation |
| A3280 | 5 to 40 | -40 to -5 | Typ 45 | E, L | LH, LT, UA | Open Collector | Chopper-stabilized |
| A3281 | 15 to 90 | -90 to -15 | Typ 100 | E, L | LH, LT, UA | Open Collector | Chopper-stabilized |
| A3282 | 70 to 150 | -150 to -70 | >140 (typ 220) | E, L | LH, UA | Open Collector | Chopper-stabilized |
| A3283 | 100 to 180 | -180 to -100 | Typ 300 | E, L | LH, LT, UA | Open Collector | Chopper-stabilized |
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