The ULN2001A, ULN2002A, ULN2003A, ULN2004A, ULQ2003A, and ULQ2004A are high-voltage, high-current Darlington transistor arrays. Each consists of seven npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of a single Darlington pair is 500 mA. The Darlington pairs can be paralleled for higher current capability. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers.
The ULN200xA and ULQ200xA families are high‑voltage, high‑current Darlington transistor arrays designed for relay, lamp, display, line‑driver and logic‑buffer applications. Each device contains seven NPN Darlington pairs with common‑cathode clamp diodes, allowing safe switching of inductive loads. Input pins include Zener protection and series resistors to limit input current for TTL or CMOS logic levels.
Key electrical parameters include a 50 V collector‑emitter rating, 500 mA peak collector current per pair, and operating temperature ranges from –20 °C to 70 °C (ULN) or –40 °C to 85 °C (ULQ). The devices are offered in multiple packages such as PDIP, SOIC, SOP, and TSSOP, with thermal impedance values ranging from 64 °C/W to 108 °C/W. The series is obsolete and no longer supplied, but the datasheet provides full mechanical and electrical details for reference.
| Collector‑emitter voltage (VCE) max | 50 V |
|---|---|
| Clamp diode reverse voltage max | 50 V |
| Input voltage (Vj) max | 30 V |
| Peak collector current per Darlington pair | 500 mA |
| Total emitter‑terminal current | -2.5 A |
| Typical input current (5 V input) | 0.35 mA |
The maximum collector‑emitter voltage is 50 V.
No, the ULN200xA series is obsolete and no longer supplied.
Typical input current is about 0.35 mA at a 5 V input.