Summary
The article discusses the ULN200x series (ULN2001, ULN2002, ULN2003, ULN2004), which are high-voltage, high-current Darlington transistor arrays containing seven open collector pairs with common emitters. Each channel supports 500 mA continuous current and 600 mA peak, featuring integrated suppression diodes for inductive loads. These arrays are compatible with various logic families and are ideal for driving loads such as solenoids, relays, motors, displays, and printheads. They come in 16-pin DIP and SO-16 packages designed for better thermal management and simplified PCB layout.Parts used in the ULN2003 Darlington Array:
- Seven open collector Darlington transistor pairs
- Integrated suppression diodes
- 16-pin DIP package
- Small outline package (SO-16)
The ULN2001, ULN2002, ULN2003 and ULN2004 are high-voltage, high-current Darlington arrays each containing seven open collector Darlington pairs with common emitters. Each channel is rated at 500 mA and can withstand peak currents of 600 mA. Suppression diodes are included for inductive load driving and the inputs are pinned opposite the outputs to simplify board layout.
The versions interface to all common logic families: ULN2001 (general purpose, DTL, TTL, PMOS, CMOS); ULN2002 (14 – 25 V PMOS); ULN2003 (5 V TTL, CMOS); ULN2004 (6 – 15 V CMOS, PMOS).
These versatile devices are useful for driving a wide range of loads including solenoids, relay DC motors, LED display filament lamps, thermal printheads and high-power buffers.
The ULN2001A/2002A/2003A and 2004A are supplied in a 16-pin DIP package with a copper leadframe to reduce thermal resistance. They are available also in small outline package (SO-16) as ULN2001D1/2002D1/2003D1/ 2004D1.
Key Features
- Seven Darlingtons per package
- Output current 500 mA per driver (600 mA peak)
- Output voltage 50 V
- Integrated suppression diodes for inductive loads
- Outputs can be paralleled for higher current
- TTL/CMOS/PMOS/DTL compatible inputs
- Input pins placed opposite to output pins to simplify layout
Read more: ULN2003 – SEVEN DARLINGTON ARRAYS IN NEW TSSOP16 PACKAGE
