Industrial-strength driver chip provides 7-ch, drop-in Darlington replacement

June 26, 2014 // By Graham Prophet
This 7-channel, NMOS low-side driver replaces Darlington transistor arrays in high-voltage systems; the drop-in compatible relay driver reduces power, cost and board space

Texas Instruments' TPL7407L replaces half of the transistor arrays required to drive high current loads, providing a new option for high voltage systems that previously required a number of transistor arrays or a motor driver. Reducing power by 40%, this new device drives the LED matrix, relay or stepper motor in high-voltage applications, such as white goods, building automation, lighting and HVAC.

When used with the SN74HC595 register, one or multiple TPL7404 can be controlled with three GPIO pins; the TPL7407L handles drain current of 600 mA per channel, reducing the number of relay drivers required per board. It supports energy-efficiency in high-voltage systems, reducing power dissipation by 40% compared to Darlington arrays, and is pin-to-pin compatible with traditional arrays. Then part is tested and compatible with the full -40C to 125C temperature range for harsh environments within industrial, automotive and telecommunications applications.

In 16-pin SOIC and TSSOP packages, pricing starts at $0.40 (1000). There is a TPL7407LEVM evaluation board for $49.00.

TI; www.ti.com/tpl7407l-pr-eu