DTB143EKT146

Overview

The DTB143EKT146 is a pre-biased PNP digital transistor manufactured by ROHM Semiconductor. It integrates bias resistors within a single SMT3 package to simplify circuit design. Key electrical specifications include a maximum collector-emitter voltage of 50 V and a continuous collector current of 500 mA. The device features a typical input resistance (R1) of 4.7 kOhms and an emitter-base resistance (R2) of 4.7 kOhms, resulting in a resistor ratio of 1. It offers a minimum DC current gain (hFE) of 47 at 50 mA and 5 V, with a transition 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 eliminate external components for inverter circuits
• Provides high-speed switching capability with a 200 MHz transition frequency
• Supports surface mount installation in a compact SMT3 package

Applications

• General-purpose inverter circuits
• Interface driving applications
• Logic level translation

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for AEC-Q101 automotive qualification if required for specific reliability standards. Ensure the ordering suffix matches the desired packaging format, such as cut tape or reel, to align with assembly line requirements.

Selection Notes

Select this component for designs requiring a PNP digital transistor with integrated biasing. The 4.7 kOhm input resistance suits standard logic interfaces. Consider the 500 mA current capacity and 200 mW power dissipation limits when designing thermal management solutions. Verify that the SMT3 package dimensions fit the available PCB space constraints.

Part Context

This part belongs to the DTB143EK series of pre-biased transistors from ROHM. It shares functional similarities with other members of the family but differs in polarity and specific resistor values. The SMT3 package provides a small footprint suitable for dense surface mount assemblies. It serves as a discrete alternative to complex driver ICs in low-power switching applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching PNP polarity, 50V VCEO, 500mA Ic, and SMT3/SOT-23-3 packaging. Verify internal resistor values and hFE characteristics against the original design requirements before substitution.