DDTD143EU-7-F

Overview

The DDTD143EU-7-F is an NPN pre-biased transistor manufactured by Diodes Incorporated, housed in a surface-mount SOT323 package. It integrates built-in biasing resistors with nominal values of R1 = 4.7 kΩ and R2 = 4.7 kΩ. The device supports a maximum supply voltage (VCC) of 50 V and handles a continuous output current (IC) of 500 mA. Electrical characteristics include a minimum DC current gain (hFE) of 47 at IC = 50 mA, and a typical gain-bandwidth product (fT) of 200 MHz. Thermal performance specifies a power dissipation (PD) of 250 mW and a junction-to-ambient thermal resistance (RθJA) of 500 °C/W.

Feature Summary

• Integrates dual biasing resistors to simplify circuit design and reduce component count.
• Utilizes epitaxial planar die construction for reliable semiconductor performance.
• Designed for automated assembly using a compact surface-mount SOT323 package.

Applications

• General-purpose switching applications requiring integrated biasing.
• Driver circuits for low-power loads where space efficiency is critical.
• Logic interface circuits utilizing the pre-biased configuration.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm availability status. The datasheet indicates that this specific part number may be classified as obsolete; therefore, confirm current production status directly with Diodes Incorporated or authorized distributors before initiating procurement processes.

Selection Notes

Select this component when a single NPN transistor with dual 4.7 kΩ biasing resistors is required in a small form factor. Ensure the application voltage does not exceed the 50 V supply rating and that the load current remains within the 500 mA limit. Verify that the SOT323 package dimensions align with the target PCB layout constraints.

Part Context

This component belongs to the DDTD series of NPN pre-biased transistors from Diodes Incorporated. The series offers various resistor combinations tailored for different logic levels and drive requirements. All devices in this family share the same SOT323 mechanical footprint and general electrical architecture, differing primarily in their internal resistor values.

Replacement Considerations

Consult the manufacturer's datasheet for alternative part numbers within the DDTD series that offer different resistor ratios. Cross-referencing with other manufacturers' pre-biased transistor catalogs is recommended if this specific obsolete part is unavailable, ensuring pinout and electrical ratings match.