DTC123YUA-HF

Overview

The DTC123YUA-HF is an NPN digital transistor manufactured by Comchip Technology, featuring built-in biasing resistors for simplified circuit design. It operates with a maximum collector-emitter voltage of 50V and a continuous collector current of 100mA. The device incorporates a base resistor (R1) of 2.2kΩ and an emitter-base resistor (R2) of 10kΩ, yielding a typical resistance ratio of approximately 4.7. Packaged in the SOT-323 surface-mount format, it supports a power dissipation of 200mW and functions within a temperature range of -55°C to +150°C.

Feature Summary

• Integrates NPN bipolar junction transistor with dual built-in biasing resistors to reduce component count and board space.
• Provides stable switching performance with a defined internal resistance ratio for predictable logic interface behavior.
• Designed for surface-mount assembly using the compact SOT-323 package suitable for automated insertion.

Applications

• Logic level shifting and voltage translation between microcontrollers and peripheral devices.
• Driver circuits for low-power relays, LEDs, or small signal loads requiring direct logic control.
• Switching applications in consumer electronics where space constraints limit discrete resistor usage.

Procurement Notes

Verify the specific suffix against official Comchip Technology documentation to confirm exact electrical tolerances and packaging variations. Ensure compatibility with RoHS directives if required by your manufacturing standards. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when a compact NPN switch with integrated biasing is required. The 2.2kΩ base resistor suits moderate drive currents from standard logic outputs. Consider the 100mA collector current limit and 50V voltage rating to ensure adequate headroom for the target load. The SOT-323 package is appropriate for high-density PCB layouts.

Part Context

This device belongs to the family of pre-biased transistors offered by Comchip Technology. These components combine a single NPN transistor with two resistors in one package. The DTC123YUA-HF variant specifically denotes the NPN polarity with a 2.2kΩ input resistor configuration, distinguishing it from other ratios or PNP variants in the same series.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify pinout compatibility and electrical parameters such as Vceo, Ic, and R1/R2 values when evaluating alternative manufacturers' equivalents.