DTC143EM-TP

Overview

The DTC143EM-TP is an NPN digital transistor manufactured by Micro Commercial Components (MCC). It integrates a single silicon NPN epitaxial planar transistor with built-in bias resistors in a compact SOT-523 surface-mount package. The device features a collector-emitter breakdown voltage of 50 V and a maximum continuous collector current of 100 mA. Internal resistance configuration includes a base resistor (R1) of 4.7 kΩ and an emitter-base resistor (R2) of 4.7 kΩ, establishing a fixed bias ratio of 1:1. Key electrical characteristics include a DC current gain (hFE) of at least 20 at IC=10mA and VCE=5V, with a saturation voltage (VCEsat) maximum of 300 mV at IB=500µA and IC=10mA. The component supports a transition frequency of 250 MHz and dissipates up to 150 mW of power.

Feature Summary

• Integrates NPN transistor with dual internal bias resistors for simplified circuit design
• Provides high-speed switching capability with a 250 MHz transition frequency
• Offers low saturation voltage for efficient power dissipation in logic interfaces
• Utilizes compact SOT-523 packaging for space-constrained applications

Applications

• General-purpose switching and logic level shifting
• Driver circuits for small-signal loads
• Interface between microcontrollers and peripheral devices
• Pull-up or pull-down resistor replacement in digital logic circuits

Procurement Notes

Verify the specific suffix 'EM' against the manufacturer's official datasheet to confirm the exact resistance values and package type, as suffixes often denote variations in internal resistor ratios or thermal ratings. Ensure the ordering documentation explicitly references the DTC143EM-TP part number to avoid confusion with similar variants like DTC143EE or DTC143XE. Confirm RoHS compliance status through the latest product specification sheet prior to procurement.

Selection Notes

Select this component when a pre-biased NPN solution is required with a 1:1 resistor ratio. The 50V rating and 100mA current capacity suit low-power digital switching tasks. Compare the 150mW power dissipation limit against the application's thermal requirements. Verify that the SOT-523 footprint matches the PCB layout constraints. Consider complementary PNP types if push-pull configurations are needed.

Part Context

The DTC143EM-TP belongs to the DTC143 series of pre-biased transistors from Micro Commercial Components. This series consolidates discrete transistor and resistor functions into a single surface-mount device. The 'TP' suffix typically indicates tape and reel packaging availability. The component serves as a direct replacement for standalone transistor-resistor networks, reducing board space and assembly complexity in modern electronic designs.

Replacement Considerations

Compatible substitutes include other NPN digital transistors with identical 50V/100mA ratings and 1:1 bias ratios, such as the DTC143EE-TP or DTC143XE-TP, provided the package and internal resistance values match. Verify pinout compatibility and thermal performance before substitution.