FMMT555A

Single Bipolar Transistors Overview

The FMMT555A is a surface-mount medium power PNP bipolar junction transistor manufactured by Diotec Semiconductor. It operates with a collector-emitter voltage of -150 V and supports a continuous DC collector current of -1 A, with a peak collector current rating of -2 A. The device dissipates up to 500 mW of power at an ambient temperature of 25°C when mounted on a PCB with 225 mm² copper pads. It features a minimum DC current gain (hFE) of 50 at both 10 mA and 300 mA collector currents, reaching up to 300. The transition frequency (fT) is rated at 100 MHz. Operating temperatures range from -55°C to +150°C for both the junction and storage.

Single Bipolar Transistors Feature Summary

• High collector current capability suitable for medium power applications
• Medium collector-emitter voltage rating for robust switching performance
• Compliant with RoHS directives without exemptions and REACH regulations
• Available in automotive-grade variants compliant or qualified to AEC-Q101 standards

Single Bipolar Transistors Applications

• Switching circuits
• Signal amplification
• LED driver designs
• Small DC motor drives
• Coil and actuator drives

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix when purchasing. The standard commercial/industrial grade does not include automotive qualifications. Suffixes -Q indicate AEC-Q101 compliance, while -AQ indicates AEC-Q101 qualification. Confirm package availability as taped and reeled options are specified. Ensure design accounts for thermal resistance requirements based on PCB copper pad dimensions.

Single Bipolar Transistors Selection Notes

Select this component for applications requiring high collector current and medium voltage handling in a compact SOT-23 or TO-236 package. Consider the complementary NPN transistor FMMT455A for push-pull configurations. Evaluate thermal dissipation limits carefully, as power ratings depend on mounting conditions. Automotive projects must specify the correct suffix to meet reliability standards.

Single Bipolar Transistors Part Context

This part belongs to the FMMT555 series of SMD medium power PNP transistors. It is designed for commercial and industrial grade usage. The datasheet provides SPICE models and STEP files for simulation and mechanical integration. The marking code is listed as TBD in the provided documentation.

Single Bipolar Transistors Replacement Considerations

The recommended complementary NPN transistor is the FMMT455A.