The L9131 is an automotive power/driver IC originally made by STMicroelectronics. It’s commonly used on engine control unit (ECU) circuit boards to drive loads such as fuel injectors, solenoids, relays and various actuators in automotive engine management systems.
📌 Overview of the L9131
Part number: L9131
Manufacturer: STMicroelectronics
Description: Automotive ECU drive IC (power driver for high‑current loads).
Package: SOP‑36 / SSOP‑36 surface‑mount package.
Typical applications:
Fuel injector driver
Idle speed control actuator
Solenoid valve driver
Engine control relays and actuators
General automotive load control