MUN5138T1G

Overview

The MUN5138T1G is a single NPN digital transistor from onsemi, featuring built-in bias resistors within an SC-59 (SOT-23) surface-mount package. It provides a collector-emax voltage of 50 V and continuous collector current of 100 mA with a power dissipation rating of 338 mW. The device includes a typical input resistance of 47 kOhms and a minimum DC current gain (hFE) of 160. Designed for operation between -55°C and +150°C, it integrates internal circuitry to simplify switching applications while maintaining standard bipolar transistor performance characteristics in a compact form factor.

Feature Summary

• Integrates NPN transistor with dual bias resistors to reduce external component count
• Provides high current gain for efficient signal switching in low-power circuits
• Operates across extended industrial temperature ranges for robust reliability

Applications

• General-purpose switching and logic interface circuits
• Driver stages for small-signal loads and relays
• Level shifting between different voltage domains in digital systems

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm exact packaging and tape specifications. Ensure that any alternative sourcing channels provide valid traceability and authenticity certificates. Cross-reference the part number with the latest datasheet revisions to confirm compliance with current environmental standards and material declarations before finalizing procurement orders.

Selection Notes

Select this component when a single NPN configuration with high input impedance is required. The 47 kOhm input resistor suits direct interfacing with standard logic outputs without excessive loading. Verify that the 100 mA current capacity meets load requirements and that the SC-59 package fits the available PCB footprint constraints compared to larger transistor packages.

Part Context

This part belongs to the MUN series of pre-biased transistors designed to replace discrete resistor-transistor networks. It consolidates multiple components into a single surface-mount device, reducing assembly time and board space. The series offers various configurations and resistance values to accommodate diverse circuit design needs while maintaining consistent electrical performance profiles.

Replacement Considerations

Direct substitutes include other NPN digital transistors with similar 50V ratings and SC-59 packaging, such as the MUN2216T1G or MUN2233T1G, provided their internal resistor ratios and current gains align with the original circuit design requirements.