DTC143EUA

Overview

The DTC143EUA is an NPN digital transistor manufactured by Micro Commercial Components (MCC). It integrates a single NPN transistor with built-in biasing resistors in a compact SOT-323 package. Key electrical parameters include a supply voltage of 50V, a collector current of 0.1A, and a power dissipation of 200mW. The device features typical input and emitter-base resistances of 4.7kΩ each, resulting in a resistor ratio of 1. It offers a minimum DC current gain (hFE) of 30 at 10mA and 5V, with a maximum operating frequency of 250MHz. The component supports surface mount installation and operates within a temperature range up to +150°C.

Feature Summary

• Integrates NPN transistor with dual 4.7kΩ biasing resistors for simplified circuit design
• Compact SOT-323 surface-mount package suitable for space-constrained applications
• High switching speed with a maximum operating frequency of 250MHz

Applications

• General-purpose inverter circuits
• Driver circuits for relays and solenoids
• Logic level shifting and buffering

Procurement Notes

Verify the manufacturer designation carefully, as the DTC143EUA part number is historically associated with ROHM Semiconductor. Confirm that the supplied units are explicitly from Micro Commercial Components (MCC) or its authorized distribution channels. Ensure the datasheet provided matches the MCC specifications for the SOT-323 package and electrical characteristics to avoid compatibility issues with designs expecting ROHM-specific parameters.

Selection Notes

Select this component when a compact NPN digital transistor with integrated 4.7kΩ base and emitter-base resistors is required. It is suitable for applications needing a single-transistor solution for switching or inversion. Verify that the 50V collector-emitter voltage and 100mA continuous current ratings meet the system requirements. Consider the SOT-323 footprint constraints during PCB layout planning.

Part Context

The DTC143EUA belongs to the family of Bias Resistor Built-in Transistors (BRTs). These devices simplify digital circuit design by replacing external discrete resistors with integrated components. The 'DTC' prefix typically denotes an NPN configuration with two internal resistors. This specific variant consolidates the transistor and resistive network into a single three-terminal package, reducing board space and assembly complexity compared to discrete solutions.

Replacement Considerations

Direct pin-compatible replacements include the ROHM DTC143EU3 and DTC143EU3HZG. Other manufacturers may offer equivalent parts under different numbering schemes, but verification of the internal resistor values (R1=4.7kΩ, R2=4.7kΩ) and hFE characteristics is essential before substitution.