TEXAS INSTRUMENTS ULN200x NPN Darlington Transistor Array DIP 16-Pin

The TEXAS INSTRUMENTS ULN200x is a high-voltage, high-current NPN Darlington transistor array integrated circuit. Housed in a standard 16-pin DIP (Dual In-line Package), this robust component contains seven independent open-collector Darlington pairs with common emitters, making it an exceptionally versatile driver solution for a wide range of applications. Its design is optimised for interfacing between low-level logic circuits and higher power loads.

A key integrated feature is the built-in suppression diode across each output, which provides crucial protection for the transistors when switching inductive loads like relays and motors, preventing damage from back EMF. The outputs are open-collector and can be paralleled together to achieve a higher current handling capability, offering design flexibility for demanding projects. The input stage is compatible with a broad spectrum of logic families including TTL, CMOS, PMOS, and DTL, ensuring easy integration into both new and legacy digital systems.

Ideal Applications

This Darlington array excels as a reliable driver for various components. It is perfectly suited for controlling relay coils, driving stepper motors and DC brushed motors, powering indicator lamps, and driving display elements such as LEDs or gas-discharge panels. It also serves effectively as a line driver or logic buffer, providing the necessary current amplification to drive multiple inputs or long lines. The clever pinout, with input pins placed directly opposite their corresponding output pins, greatly simplifies printed circuit board layout and routing.

Specifications & Features

• High Power Handling: Capable of switching loads up to 50V and 500mA per channel, with a total power dissipation of 25W.
• High Current Gain: Offers a high DC current gain (hFE) of 600, ensuring effective signal amplification.
• Robust Construction: Through-hole mounting allows