DTD123EKT146

Overview

The DTD123EKT146 is a single NPN digital transistor manufactured by ROHM Semiconductor, housed in an SOT-346-3 (SMT3) surface-mount package. It integrates bias resistors to simplify circuit design. Key electrical parameters include a collector-emitter voltage (VCEO) of 50 V and a continuous collector current of 500 mA. The device features a typical input resistance (R1) of 2.2 kOhms and an emitter-base resistance (R2) of 2.2 kOhms. It offers a minimum DC current gain (hFE) of 39 at 50 mA and 5 V, with a maximum operating frequency of 200 MHz. Power dissipation is rated at 200 mW, and the maximum operating temperature reaches +150°C.

Feature Summary

• Integrates built-in bias resistors to enable inverter circuit configuration without external input components.
• Utilizes thin-film resistors for complete isolation, allowing negative input biasing and minimizing parasitic effects.
• Simplifies design by requiring only on/off condition settings for operation.

Applications

• General-purpose switching applications
• Inverter circuits
• Driver circuits for relays and lamps

Procurement Notes

Verify the specific suffix KT146 to confirm the SMT3 packaging and taping specifications. Ensure compatibility with RoHS directives if required by the target application. Confirm that the component is suitable for non-automotive use, as standard series products are generally not recommended for automotive equipment. Cross-reference datasheet revisions to ensure parameter consistency.

Selection Notes

Select this component when a compact NPN switch with integrated biasing is needed for low-power applications. The 500 mA current rating and 50 V breakdown voltage suit general signal or small load switching. Consider the SOT-346 footprint for space-constrained PCB layouts. Verify thermal management requirements given the 200 mW power dissipation limit in small packages.

Part Context

This part belongs to the DTD123EK series of digital transistors from ROHM. It is a standard-grade product designed for general electronic equipment. The series is characterized by high reliability and simplified circuit design through integrated resistors. It is distinct from automotive-grade variants like the DTC123JKAFRA, which support AEC-Q101 standards.

Replacement Considerations

Direct substitutes may include other NPN digital transistors with similar R1/R2 values and package types, such as the DTD123YKT146 or DTD123ECT116, provided pinout and electrical ratings match. Always verify saturation voltage and hFE characteristics against the original design requirements before substitution.