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5 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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The Allegro Microsystems A2557KLB is a protected quad driver designed for cost-effective relay-driving applications. Each of its four outputs can sink up to 300 mA with a minimum breakdown voltage of 60 V. The device includes independent overcurrent protection and thermal limiting for each channel, with overcurrent protection activated at a nominal 500 mA. It also features fault-detection circuitry for open or shorted loads, indicated by a single FAULT output.
Designed for TTL and 5V CMOS compatibility, the A2557KLB offers a low-power Sleep Mode that reduces supply current to below 100 μA. It is available in a 16-SOIC package suitable for surface-mount applications. The device also includes integral output flyback/clamp diodes and output SOA protection.
This driver is suitable for applications where turn-on time is not a primary concern, such as driving incandescent lamps. Its robust protection features make it a reliable choice for various industrial and automotive control systems requiring precise load management.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.75 | $0.75 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The nominal supply voltage is 5 V, with a range of 4.75 V to 5.25 V.
The output current per channel is 300 mA nominal, with a maximum output current of 500 mA and short-circuit limit at 500 mA.
The breakdown voltage is 60 V minimum.
The operating temperature range is -40°C to 125°C (ambient).
The A2557KLB is offered in a 16-SOIC surface-mount package.
It includes fixed current limiting at 500 mA and over-temperature protection, with a status flag output to indicate faults.
It is a low-side driver with bipolar outputs.