UMX3NTR

Overview

The UMX3NTR is a dual NPN bipolar junction transistor array manufactured by Rohm Semiconductor. It features a maximum collector-emitter voltage of 50V and a continuous collector current of 150mA per transistor. The device operates with a transition frequency of 180MHz and has a maximum power dissipation of 150mW. It is housed in a surface-mount UMT6 package, equivalent to SOT-363 or SC-88. The component supports a maximum junction temperature of 150°C and exhibits a DC current gain (hFE) of at least 120 at 1mA and 6V. The part status is listed as not recommended for new designs.

Feature Summary

• Dual independent NPN transistors integrated into a single compact surface-mount package
• High-speed switching capability supported by a 180MHz transition frequency
• Low saturation voltage characteristics suitable for efficient signal switching applications

Applications

• Digital signal switching and logic level conversion circuits
• Small-signal amplification and buffering stages
• Differential amplifier configurations in portable electronic devices

Procurement Notes

Verify the obsolete status before procurement, as this component is not recommended for new designs. Confirm availability through authorized distributors, noting that stock levels may be limited due to end-of-life status. Ensure the ordering suffix matches the required tape and reel or cut tape format for your assembly process. Cross-reference pinouts carefully against the official datasheet to prevent installation errors in existing designs.

Selection Notes

Select this component only for retrofitting or maintaining existing equipment where the original design specified the UMX3NTR. Evaluate alternative dual NPN arrays if designing new hardware, given the obsolescence warning. Consider thermal management requirements, as the 150mW power dissipation limit in the small UMT6 package restricts high-current applications. Verify that the 50V voltage rating meets the circuit's operational demands without excessive margin.

Part Context

The UMX3NTR belongs to Rohm Semiconductor's UMX series of dual bipolar transistor arrays. This series provides compact solutions for space-constrained printed circuit boards. The UMT6 package allows for high-density mounting compared to discrete components. The part is widely recognized in legacy consumer electronics and industrial control systems requiring dual NPN functionality in a minimal footprint.

Replacement Considerations

The CMKT3920 TR PBFREE from Central Semiconductor Corp is identified as a direct substitute. Verify electrical compatibility and pin alignment before replacement. Other compatible dual NPN arrays in similar packages should be evaluated for new designs.