The ULN2001A is an obsolete high-voltage, high-current Darlington transistor array. It consists of seven npn Darlington pairs with high-voltage outputs and common-cathode clamp diodes for switching inductive loads. Each Darlington pair has a collector-current rating of 500mA and can be paralleled for higher current capability. It is suitable for applications such as relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers.
The ULN2001A family (ULN2001A, ULN2002A, ULN2003A, ULN2004A, ULQ2003A, ULQ2004A) are high‑voltage, high‑current Darlington transistor arrays designed for driving inductive loads such as relays, lamps, and LED displays. Each device contains seven NPN Darlington pairs with common‑cathode clamp diodes, offering up to 500 mA collector current per pair and the ability to parallel pairs for higher current capability.
The datasheet includes ordering information for various package types (D, N, NS, PW, etc.), absolute maximum ratings, electrical characteristics, and mechanical dimensions. It also contains a notice about the ULN2001A being obsolete and no longer supplied, along with TI's standard warranty and usage disclaimer.
No, the ULN2001A is obsolete and no longer supplied.
Each Darlington pair is rated for a maximum collector current of 500 mA.
The ULN2003A is offered in D, N, NS, and PW packages.