DDTC143TUA-7-F

Overview

The DDTC143TUA-7-F is an NPN pre-biased small signal surface mount transistor manufactured by Diodes Incorporated. It features epitaxial planar die construction and a built-in biasing resistor (R1 only) with a nominal value of 4.7 kΩ. The device operates within a collector-emitter voltage range of up to 50 V and supports a maximum continuous collector current of 100 mA. Electrical characteristics include a DC current transfer ratio (hFE) ranging from 100 to 600 at IC = 1mA, VCE = 5V, and a gain-bandwidth product of 250 MHz. Power dissipation is rated at 200 mW with a thermal resistance of 625 °C/W. The component is housed in a SOT323 package, complies with RoHS standards, and is available in 3,000-unit reels.

Feature Summary

• Integrates a single built-in biasing resistor for simplified circuit design
• Utilizes epitaxial planar die construction for reliable performance
• Housed in a compact SOT323 surface mount package suitable for automated assembly

Applications

• Switching applications requiring integrated base biasing
• Driver circuits for low-power loads
• General-purpose digital logic interfacing

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packing quantity and carrier type. Confirm that the requested part number matches the active status listed in the manufacturer's current catalog. Ensure compliance with environmental directives such as RoHS 3 and halogen-free requirements if applicable to the target market. Cross-reference the date code marking format to validate production timing.

Selection Notes

Select this component when a single NPN transistor with a fixed 4.7 kΩ input resistor is required. Ensure the application voltage does not exceed the 50 V collector-emitter rating. Verify that the 100 mA current limit meets load requirements. Consider the SOT323 footprint constraints during PCB layout. Compare hFE ranges if precise gain control is necessary for the specific operating point.

Part Context

This part belongs to the DDTC (R1-ONLY SERIES) UA family from Diodes Incorporated. It shares the same physical package and general electrical structure as other variants in the series, differing primarily in the nominal value of the internal biasing resistor. The 'UA' suffix denotes the SOT323 package style.

Replacement Considerations

Direct substitutes within the same series include DDTC113TUA-7-F (1kΩ), DDTC123TUA-7-F (2.2kΩ), DDTC114TUA-7-F (10kΩ), DDTC124TUA-7-F (22kΩ), DDTC144TUA-7-F (47kΩ), DDTC115TUA-7-F (100kΩ), and DDTC125TUA-7-F (200kΩ). Verify resistor tolerance and hFE specifications match the original design requirements.