MMBTA28

Single Bipolar Transistors Overview

The MMBTA28 is an NPN Darlington transistor manufactured by onsemi, designed for applications requiring high current gain with a collector current up to 500 mA. It utilizes the 03 process technology and is available in a compact SOT-23 surface-mount package. The device features a collector-emitter voltage rating of 80 V and a continuous collector current capacity of 800 mA. It operates within a junction temperature range of -55 °C to +150 °C. The component is lead-free and suitable for general electronic designs where high gain and moderate power handling are required.

Single Bipolar Transistors Feature Summary

• High current gain capability optimized for driving loads at collector currents up to 500 mA
• Robust thermal performance with a maximum junction temperature rating of 150 °C
• Lead-free construction compliant with environmental standards

Single Bipolar Transistors Applications

• General-purpose switching circuits requiring high input impedance
• Driver stages for relays or small motors
• Logic-to-analog interface circuits

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix to confirm package type and reel specifications. Ensure the selected variant meets any automotive qualification requirements if applicable, as standard versions may differ from AEC-Q101 certified parts. Confirm pinout compatibility with existing PCB footprints before finalizing procurement decisions.

Single Bipolar Transistors Selection Notes

Select this component when high DC current gain is necessary to drive moderate loads directly from low-current logic outputs. Consider the SOT-23 package constraints for thermal dissipation in dense layouts. Evaluate the 80 V breakdown voltage against circuit supply rails to ensure adequate safety margins during transient conditions.

Single Bipolar Transistors Part Context

This part belongs to onsemi's lineup of NPN Darlington transistors, which also includes the PZTA28 in a larger SOT-223 package. The MMBTA28 specifically targets space-constrained designs where the smaller SOT-23 footprint is preferred over through-hole or larger surface-mount options while maintaining similar electrical characteristics.

Single Bipolar Transistors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official cross-reference guides or manufacturer datasheets for verified equivalents that match the SOT-23 package and electrical ratings.