The UDN2981A is an 8-channel source driver that is useful for interfacing between low-level logic and high-current loads. This device is recommended for high-side switching applications that benefit from separate logic and load grounds, with load supply voltages to 50 V and output currents to -500 mA.
The UDN2981A series are 8‑channel high‑side source drivers designed for interfacing low‑level logic with high‑current loads such as relays, solenoids, lamps, stepper or servo motors, print hammers and LEDs. They operate from a 5 V logic input and can switch load supply voltages up to 50 V, providing up to 500 mA of source current per channel.
Key features include TTL, DTL, PMOS and CMOS compatible inputs, transient‑protected outputs, and a variety of DIP and SOIC package options. The devices are rated for continuous operation at 120 mA per output at 15 V supply and 50 °C ambient, with an absolute maximum output current of –500 mA. Operating temperature ranges from –20 °C to +85 °C, and the series is available in lead‑free variants.
| Output Source Current Capability | 500 mA |
|---|---|
| Output Breakdown Voltage | 50 V |
| Input Voltage Range | 5 V to 50 V |
| Operating Temperature Range | -20 °C to +85 °C |
| Maximum Continuous Output Current | -500 mA |
Each output can continuously source up to 500 mA.
The drivers accept TTL, DTL, PMOS and CMOS 5 V logic inputs.
The devices are specified for –20 °C to +85 °C ambient temperature.
The output breakdown voltage is rated up to 50 V.