DTD143ESTP

Overview

The DTD143ESTP is a single NPN digital transistor manufactured by Rohm Semiconductor, featuring built-in bias resistors for simplified circuit design. It operates with a maximum collector-emitter voltage of 50 V and supports a continuous collector current of 500 mA. The device incorporates a base resistor (R1) and an emitter-base resistor (R2), both typically valued at 4.7 kOhms. Key electrical characteristics include a minimum DC current gain (hFE) of 47 at 50 mA and 5 V, and a transition frequency of 200 MHz. Power dissipation is rated at 200 mW, and the component utilizes a surface-mount SOT-346-3 package.

Feature Summary

• Integrates dual bias resistors to eliminate external input components in inverter circuits
• Provides high-speed switching capability suitable for digital logic applications
• Offers robust current handling with 500 mA collector current capacity

Applications

• Digital interface circuits requiring level shifting or buffering
• Inverter configurations in microcontroller output stages
• Driver circuits for low-power loads in consumer electronics

Procurement Notes

Verify the exact suffix against the manufacturer's latest datasheet to confirm pinout compatibility and resistance values. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Check for obsolescence notices as product lifecycles may change. Ensure the selected packaging format matches the automated placement requirements of the manufacturing line.

Selection Notes

Select this component when a higher collector current than standard 100 mA digital transistors is required. The 4.7 kOhm internal resistor ratio suits general-purpose logic interfacing. Consider the SOT-346-3 footprint constraints during PCB layout. Compare power dissipation ratings against thermal management capabilities if operating near maximum limits.

Part Context

This part belongs to the DTD143EK series of NPN digital transistors from Rohm Semiconductor. The series is characterized by integrated bias networks designed to reduce board space and assembly costs. Variants within the family differ primarily in packaging styles such as SOT-346 or SOT-23, while maintaining similar electrical performance profiles for general-purpose switching tasks.

Replacement Considerations

Publicly confirmed substitutes include DTC143ESATP for NPN variants with different current ratings, and DTC143EU3T106 for compact SMD applications. Verify that replacement parts match the 50 V rating and 500 mA current requirement. Cross-reference internal resistor values to ensure compatible drive levels.