MUN2138T1G

Overview

The MUN2138T1G is a Bias Resistor Transistor (BRT) manufactured by onsemi, classified as a digital transistor. It features a single PNP bipolar junction transistor integrated with a monolithic bias network consisting of two resistors: a series base resistor and a base-emitter resistor. The device is housed in an SC-59 (SOT-23) surface-mount package. Key electrical parameters include a maximum collector-emitter voltage (VCEO) of 50 V, a continuous collector current of 100 mA, and a power dissipation rating of 230 mW at 25°C ambient temperature. The typical input resistance is 47 kOhms, with a minimum DC current gain (hFE) of 80.

Feature Summary

• Integrates a single PNP transistor with a monolithic bias network to replace discrete components
• Reduces printed circuit board space and component count in circuit designs
• Simplifies circuit design by eliminating external biasing resistors

Applications

• General-purpose switching applications
• Driver circuits for relays and solenoids
• Logic level translation interfaces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm exact packaging and tape-and-reel specifications. Ensure compliance with RoHS directives and lead-free requirements relevant to the target assembly process. Cross-reference the part number with the latest datasheet revision to confirm pinout consistency and thermal characteristics before finalizing procurement orders.

Selection Notes

Select this component when a compact PNP solution with built-in biasing is required for low-power switching tasks. The 50 V rating and 100 mA current capacity suit standard logic interface duties. Compare the 47 kOhm input resistance against other variants in the MUN21xx series to ensure compatibility with the driving source impedance and desired switching speed requirements.

Part Context

This component belongs to the MUN21xx series of Bias Resistor Transistors from onsemi. These devices are designed to simplify analog and digital circuit layouts by combining a transistor and bias resistors into a single SMD package. The series offers various resistor ratios and values to accommodate different drive conditions while maintaining a small footprint suitable for dense PCB designs.

Replacement Considerations

Compatible substitutes within the same family include MMUN2138LT1G and MUN2138DT1G. Verify that alternative part numbers maintain identical pin configurations and electrical ratings to ensure direct interchangeability without schematic modifications.