DDTD143EC-7-F

Overview

The DDTD143EC-7-F is an NPN pre-biased surface-mount transistor manufactured by Diodes Incorporated. It features a built-in biasing resistor network with nominal values of R1 = 4.7 kΩ and R2 = 4.7 kΩ. The device operates within a supply voltage range up to 50 V and supports a continuous collector current of 500 mA. It utilizes an epitaxial planar die construction housed in a SOT-23 package, providing a power dissipation capacity of 250 mW at +25°C ambient temperature. The component is fully RoHS compliant and halogen-free.

Feature Summary

• Integrated dual biasing resistors (R1 and R2) simplify circuit design by reducing external component count.
• Epitaxial planar die construction ensures reliable performance under standard operating conditions.
• Compliant with environmental standards including RoHS, halogen-free, and antimony-free specifications.

Applications

• General-purpose switching applications requiring simplified bias networks.
• Driver circuits for low-power loads where space efficiency is critical.
• Digital logic interface circuits utilizing the integrated base resistance.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm availability status. The datasheet indicates that certain variants within this series may be obsolete; therefore, cross-reference the exact part number with current production lists before finalizing procurement plans to ensure compatibility with long-term supply requirements.

Selection Notes

Select this component when an NPN configuration with specific 4.7 kΩ internal biasing resistors is required. Ensure the application voltage does not exceed the 50 V supply limit and that the thermal management strategy accommodates the 250 mW power dissipation rating in the SOT-23 package. Verify that the complementary PNP type is not needed for the specific circuit topology.

Part Context

This component belongs to the DDTD(XXXX)C series of NPN pre-biased transistors from Diodes Incorporated. It shares the same physical package and general electrical characteristics as other members of the family, distinguished primarily by the specific resistance values of its internal biasing network. The series offers complementary PNP types under the DDTB designation.

Replacement Considerations

Direct substitutes include other DDTD143EC-7-F units from Diodes Incorporated. Complementary designs using PNP technology should utilize the DDTB143EC-7-F variant. Verify pinout compatibility and internal resistor tolerances when considering alternative manufacturers.