DDTD143TU-7-F

Overview

The DDTD143TU-7-F is an NPN pre-biased transistor manufactured by Diodes Incorporated, housed in a surface-mount SOT-323 package. It features built-in biasing resistors with nominal values of R1 = 4.7 kΩ and R2 = Open. The device supports a collector-emitter breakdown voltage (BVCEO) of 40 V and a continuous collector current of 500 mA. Electrical characteristics include a minimum DC current gain (hFE) of 100 at IC = 5 mA and a typical gain-bandwidth product (fT) of 200 MHz. Thermal performance specifies a power dissipation of 250 mW and a junction-to-ambient thermal resistance of 500 °C/W. Operating temperatures range from -55°C to +150°C.

Feature Summary

• Epitaxial planar die construction for reliable semiconductor performance
• Integrated biasing resistors simplify circuit design and reduce component count
• Totally lead-free and fully RoHS compliant manufacturing process
• Halogen and antimony-free green device suitable for automated assembly

Applications

• General-purpose switching applications requiring integrated base drive
• Driver circuits for low-power loads such as LEDs or relays
• Logic interface buffering between microcontrollers and peripheral devices

Procurement Notes

Verify the obsolete status of this specific part number against current manufacturer catalogs before finalizing procurement plans. Confirm that alternative components within the DDTD series meet the required electrical specifications and packaging constraints. Ensure compliance with environmental directives such as RoHS 3 and REACH if applicable to the target market. Review the latest datasheet revision for any updates to mechanical dimensions or absolute maximum ratings.

Selection Notes

Select this component when a single NPN transistor with a 4.7 kΩ base resistor is required in a compact SOT-323 footprint. Verify that the 40 V collector-emitter voltage rating aligns with the system supply rails. Consider the 500 mA output current capability for load requirements. Evaluate the thermal resistance of 500 °C/W to ensure adequate heat dissipation on the printed circuit board layout under expected operating conditions.

Part Context

This component belongs to the DDTD series of NPN pre-biased transistors offered by Diodes Incorporated. The series provides various resistor combinations tailored for different logic families and drive requirements. The DDTD143TU variant specifically utilizes a 4.7 kΩ input resistor configuration. It shares the same SOT-323 package and epitaxial construction as other members of the family, ensuring consistent mechanical integration across designs.

Replacement Considerations

The official datasheet lists the DDTD143TU-7-F as Obsolete. No direct substitute part numbers are provided in the source material. Designers should consult the manufacturer's website or authorized distributors for current active replacements within the DDTD series that match the 4.7 kΩ resistor specification and SOT-323 package.