MMBTA42-7

Single Bipolar Transistors Overview

The MMBTA42-7 is an NPN small signal surface mount transistor manufactured using epitaxial planar die construction. It features a collector-base voltage (VCBO) and collector-emitter voltage (VCEO) of 300 V, with an emitter-base voltage (VEBO) of 6.0 V. The device supports a maximum collector current (IC) of 500 mA and power dissipation (Pd) of 300 mW at 25°C ambient temperature. Thermal resistance from junction to ambient is 417 K/W. Operating and storage temperatures range from -55°C to +150°C. DC current gain (hFE) ranges from 25 to 40 depending on collector current conditions. The saturation voltage (VCE(SAT)) is typically 0.5 V at IC = 20 mA. The transition frequency (fT) is 50 MHz.

Single Bipolar Transistors Feature Summary

• Epitaxial planar die construction for reliable performance
• High breakdown voltage suitable for medium power amplification and switching
• Miniature SOT-23 plastic package designed for surface mounting circuits

Single Bipolar Transistors Applications

• Medium power amplification
• Switching applications
• Surface mounting circuits

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix when purchasing. The base part number MMBTA42-7 indicates standard packaging. A lead-free version is available by adding the -F suffix to the part number. Confirm the tape and reel quantity matches project requirements before procurement. Ensure the component marking code aligns with the expected date code and product type for quality assurance.

Single Bipolar Transistors Selection Notes

Select this component for designs requiring high voltage handling in a compact surface mount footprint. The 300 V rating makes it suitable for high-side switching or amplifier stages where standard low-voltage transistors would fail. Consider the complementary PNP type, MMBTA92, if push-pull configurations are needed. Evaluate thermal constraints carefully due to the low power dissipation rating in the SOT-23 package.

Single Bipolar Transistors Part Context

This component belongs to the family of NPN small signal transistors produced by Diodes Incorporated. It is specifically engineered for applications demanding high voltage tolerance within a miniature form factor. The device utilizes epitaxial planar technology to ensure consistent electrical characteristics across operating temperatures. It serves as a discrete solution for signal processing and control tasks in consumer and industrial electronics.

Single Bipolar Transistors Replacement Considerations

The datasheet identifies the MMBTA92 as the complementary PNP type. No other direct NPN substitutes are listed in the official documentation.