Through-hole ULN2803A 8-channel Darlington transistor array in an 18-pin DIP package with open-collector outputs and common clamp-diode pin. Drives relays, solenoids, lamps, and unipolar stepper motor windings.
| Pin | Position | Type |
|---|---|---|
| 1B | 1 | Unknown |
| 2B | 2 | Unknown |
| 3B | 3 | Unknown |
| 4B | 4 | Unknown |
| 5B | 5 | Unknown |
| 6B | 6 | Unknown |
| 7B | 7 | Unknown |
| 8B | 8 | Unknown |
| GND | 9 | Ground |
| COM | 10 | Unknown |
| 8C | 11 | Unknown |
| 7C | 12 | Unknown |
| 6C | 13 | Unknown |
| 5C | 14 | Unknown |
| 4C | 15 | Unknown |
| 3C | 16 | Unknown |
| 2C | 17 | Unknown |
| 1C | 18 | Unknown |
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