MUN2137T1G

Overview

The MUN2137T1G 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 SOT-23-3 surface-mount package. Key electrical specifications include a maximum collector-emitter voltage (VCEO) of 50 V, a continuous collector current of 100 mA, and a power dissipation rating of 338 mW at 25°C ambient temperature. The typical input resistance is 4.7 kOhms with a resistor ratio of 1. The component operates within a temperature range of -55°C to +150°C.

Feature Summary

• Integrates a single PNP transistor with a monolithic bias network to replace discrete components
• Reduces printed circuit board space and simplifies circuit design through component consolidation
• Provides built-in biasing via internal series base and base-emitter resistors

Applications

• General-purpose switching applications requiring simplified bias networks
• Low-power surface mount circuits where board space is limited
• Digital logic interface circuits replacing discrete resistor-transistor combinations

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm pinout configuration and electrical characteristics. Ensure the selected variant matches the required polarity and resistance values for the target application. Cross-reference the part number with the latest datasheet revision to confirm compliance with current environmental standards such as RoHS and lead-free requirements before finalizing procurement.

Selection Notes

Select this component when a PNP digital transistor with a 4.7 kOhm input resistance and unity resistor ratio is required. Confirm that the 50 V collector-emitter voltage and 100 mA current ratings exceed the maximum operational loads. Verify compatibility with the SOT-23-3 footprint during the layout phase. Compare performance metrics against alternative BRT families if specific gain or leakage characteristics are critical to the system design.

Part Context

This component belongs to the MUN2137 series of Bias Resistor Transistors from onsemi. These devices are engineered to simplify the design of digital circuits by integrating biasing resistors directly with the transistor die. The series offers a compact solution for applications previously requiring separate transistors and external resistor networks, thereby reducing assembly complexity and improving reliability in consumer and industrial electronics.

Replacement Considerations

Publicly confirmed substitute part numbers include MMUN2137LT1G and MUN2132T1G. Verify pinout compatibility and electrical parameter alignment with the original design requirements before substitution.