DTD743ZETL

Overview

The DTD743ZETL is an NPN digital transistor from the ROHM DTD743Z series, integrating bias resistors within a single SMD package. It features a collector-emitter voltage (VCC) of 30 V and a maximum continuous collector current (IC) of 200 mA. The device includes built-in thin-film resistors with R1 at 4.7 kOhms and R2 at 47 kOhms, yielding a resistance ratio of approximately 10. Key electrical characteristics include a DC current gain (GI) of 140 at 100 mA/2 V, a transition frequency (fT) of 260 MHz, and a power dissipation rating of 150 mW. It operates within a junction temperature range up to 150°C.

Feature Summary

• Built-in biasing resistors enable inverter circuit configuration without external input resistors.
• Thin-film resistors provide complete isolation, allowing negative input biasing and eliminating parasitic effects.
• Simplified operation requires only on/off condition settings for circuit design.

Applications

• Switching circuits
• Inverter circuits
• Interface circuits
• Driver circuits

Procurement Notes

Verify the specific suffix against official documentation to confirm the exact package type, as ordering codes may indicate variations in tape-and-reel specifications or marking codes. Confirm RoHS compliance status through the manufacturer's latest release notes before finalizing procurement orders.

Selection Notes

Select this component when a compact NPN solution with integrated biasing is required for logic-level inversion or switching. Ensure the 30 V collector voltage and 200 mA current limits accommodate the target load requirements. Verify that the 150 mW power dissipation capability is sufficient for the intended thermal environment.

Part Context

This part belongs to the DTD743Z series of NPN digital transistors manufactured by ROHM Semiconductor. It serves as the NPN counterpart to the DTB743Z PNP series. The device is designed for general-purpose electronic equipment, offering a space-saving alternative to discrete resistor-transistor combinations.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Cross-reference with other manufacturers' NPN digital transistors having similar 30 V ratings, 200 mA current capacity, and compatible pinouts if replacement is necessary.

FAQ

What is the function of the built-in resistors?

The built-in resistors allow the configuration of an inverter circuit without connecting external input resistors, simplifying the circuit design.

Can the input handle negative biasing?

Yes, the bias resistors consist of thin-film resistors with complete isolation, which allows for the negative biasing of the input.

What is the typical resistance ratio of R2 to R1?

The typical resistance ratio of R2 to R1 is 10, with R1 being 4.7 kOhms and R2 being 47 kOhms.