FMC4AT148

Overview

The FMC4AT148 is a dual digital transistor manufactured by ROHM Semiconductor, featuring two PNP transistors in an SOT-25-5 package. It supports a maximum collector-emitter voltage of -30V and a continuous collector current of -100mA. The device includes built-in bias resistors with typical values of 2.2kOhms for the base resistor and a ratio of 21. Key electrical parameters include a minimum DC current gain (hfe) of 80 at -10mA and -5V, a maximum operating frequency of 250MHz, and power dissipation of 350mW. The emitter-base voltage is rated at -1.1V, with a saturation voltage of -100mV.

Feature Summary

• Integrates dual PNP transistors with pre-biased internal resistors to simplify circuit design.
• Optimized for high-speed switching applications with a transition frequency up to 250 MHz.
• Compact SMD/SMT packaging suitable for space-constrained surface mount layouts.

Applications

• General-purpose signal switching in consumer electronics
• Driver circuits for low-power loads
• Logic level translation interfaces

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific ordering suffixes that may indicate tape-and-reel versus cut-tape packaging variants. Ensure storage conditions adhere to moisture sensitivity levels defined in the datasheet to prevent degradation prior to assembly.

Selection Notes

Select this component when dual PNP switching with integrated biasing is required. Compare against similar models like FMG3AT148 if NPN polarity is needed instead. Consider the 350mW power dissipation limit and -30V voltage rating to ensure adequate headroom for the target application's electrical stress conditions.

Part Context

This part belongs to the FMA5AT series of digital transistors from ROHM Semiconductor. It is designed as a small-signal solution replacing discrete transistor networks. The series focuses on reducing board space and assembly costs by integrating resistors directly onto the silicon die within standard surface-mount packages.

Replacement Considerations

FMG3AT148 serves as a functional alternative if NPN polarity is acceptable rather than PNP. Verify pinout compatibility between SOT-25-5 variants before substitution. Electrical characteristics such as hfe and Vceo must be reviewed to ensure they meet the original design requirements.