Automotive-grade regulator transistors tolerate 60V transients

November 30, 2017 // By Christoph Hammerschmidt
Smaller footprint resulting from lower component count and the ability of tolerating voltage spikes up to 60V – these are the most striking features of three new voltage regulator trasnsistors from Diodes, Inc. With an input of 12V or 24V, the devices are well suited for deployment in vehicles. And, yes, they are automotive-qualified to the AEC-Q101 standard. Output voltage is 5V, 8V or 12V.

By monolithically integrating a transistor, Zener diode, and resistor into a SOT23 package, the ZXTR2105FQ, ZXTR2108FQ and ZXTR2112FQ regulator transistors reduce component count, which minimizes PCB area and increases system reliability by reducing PCB interconnect. The ZXTR2105FQ is targeted at applications that require a 5V ±5% regulated supply from a 12V battery, e.g., for a stable MCU supply within the required 4.7V to 5.3V supply range. The ZXTR2112FQ is aimed at cars and trucks that have 24V batteries but need a 12V ±10% supply for applications such as the VCC supply for gate driver ICs. All these regulator transistors deliver an output current up to 15mA.

The 60V maximum input rating of all these regulators ensures sufficient headroom in the event of transient over-voltage conditions, while their line and load regulation safeguards continuous operation by ensuring transient voltage drops cannot cause latch-up, further contributing to system reliability.

The automotive-qualified ZXTR21xxFQ devices provide a highly reliable and compact solution to common voltage regulator requirements in vehicle electronics and are priced at $0.15 in 10k quantities. Further information is available at


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