UMH33NTN

Overview

The UMH33NTN is a dual NPN digital transistor array manufactured by ROHM Semiconductor, housed in a compact SOT-363 (UMT6) surface-mount package. It integrates two independent pre-biased NPN transistors with internal base resistors of 2.2 kΩ each. Key electrical specifications include a collector-emitter voltage (VCEO) of 20 V, a continuous collector current (IC) of 400 mA, and a maximum power dissipation (PD) of 150 mW. The device features a minimum DC current gain (hFE) ranging from 820 to 2700 at specified test conditions, with a typical output current of 0.4 A. It operates within a temperature range of -55°C to +150°C and complies with RoHS standards.

Feature Summary

• Integrates two independent NPN transistors with built-in base resistors for simplified circuit design
• Compact SOT-363 surface-mount packaging suitable for space-constrained applications
• High current gain capability supporting efficient switching performance

Applications

• Digital signal switching and logic level conversion circuits
• Small-signal amplification and buffering stages
• General-purpose control circuits in portable electronic devices

Procurement Notes

Verify the specific suffix and tape/reel configuration when ordering to ensure compatibility with automated assembly processes. Confirm that the 2.2 kΩ input resistance matches the target circuit requirements, as variations exist within the UMH series. Check for lead-free compliance documentation if required by specific manufacturing standards.

Selection Notes

Select this component when a dual NPN configuration with moderate input resistance is required in a minimal footprint. Compare against alternatives like the UMH37NTN if higher input impedance or different gain characteristics are needed. Ensure the 20 V voltage rating suffices for the application's supply voltage and transient conditions.

Part Context

This part belongs to ROHM's UMH series of digital transistors, which combine bipolar junction transistors with internal biasing resistors. The UMT6/SOT-363 package is widely used in consumer electronics and computer peripherals due to its small size and high pin density. It serves as a direct replacement for discrete resistor-transistor networks, reducing board space and assembly costs.

Replacement Considerations

Direct substitutes include other ROHM parts in the same series with identical pinouts but different resistor values, such as the UMH37NTN (10 kΩ) or UMX1NTN (different polarity/configuration). Verify that any cross-brand alternative maintains the same SOT-363 footprint and electrical ratings to ensure mechanical and functional compatibility.