Diotec Semiconductor AG

https://www.diotec.com

Sep 8, 2026

Diotec’s MMDTC907DW-AQ: Integrated Switching for Automotive Actuator Applications

Modern vehicles rely on a large number of electrically controlled functions. From door locks and relay drivers to interior and exterior lighting, many of these applications use compact actuators, solenoids or small motors that simply need to be switched on and off reliably. A typical low-side switching stage may require a transistor together with external bias components. In a conventional discrete implementation, this can mean a transistor and two resistors: one to define the base current and another to ensure the transistor remains reliably off when the control signal is inactive.

When this circuit is repeated across an automotive electronic control unit, the component count, PCB area and assembly requirements can quickly become significant.

Two Switching Channels in One Compact Package

Diotec Semiconductor addresses this requirement with the MMDTC907DW-AQ, a dual pre-biased NPN transistor designed for compact switching applications in automotive electronics.

The device integrates two 50 V, 100 mA NPN transistors, with the associated bias resistors incorporated into the semiconductor package. Both transistors are packaged in a compact SOT-363 case outline, providing two complete switching stages while reducing the number of individual external components required on the PCB.

For the designer, the integration can simplify the circuit around common microcontroller-controlled loads. Instead of implementing each switching channel with a discrete transistor and two external resistors, the MMDTC907DW-AQ combines these functions in a single component.

This can help reduce:

PCB component count
Board space requirements
Assembly complexity
Number of discrete interconnections
Design effort for repetitive switching stages
And last but not least the overall costs

Designed for Automotive Electronics

The MMDTC907DW-AQ is AEC-Q101 qualified, supporting its use in automotive applications where qualified discrete semiconductor technology is required.

With its dual-channel configuration and integrated biasing, the device is particularly suited to applications where multiple low-current loads must be controlled from logic-level signals. Potential applications include relay and solenoid drivers, lighting control and other simple actuator functions where a compact, defined switching stage is required.

Integration at the Semiconductor Level

The value of an integrated pre-biased transistor is easy to overlook because the function itself is straightforward. There is no complex power conversion or advanced control algorithm involved. The device performs a fundamental task: translating a low-power control signal into a reliable switched output.

However, these simple switching functions are often replicated many times throughout a vehicle. Integrating the transistor and bias network at semiconductor level therefore addresses a practical system-design issue: reducing repetition in the surrounding circuitry.

As a German based manufacturer with worldwide factories, Diotec develops and supplies discrete and integrated semiconductor solutions for applications where reliable switching, compact packaging and automotive qualification are important design considerations.

In a modern vehicle, a door lock actuator may only need a simple command: on or off. Delivering that command reliably starts with the semiconductor device that sits between the controller and the load.