DTD543ZMT2L

Overview

The DTD543ZMT2L 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 12 V and supports a continuous collector current of 500 mA. The device includes an input resistor (R1) of 4.7 kOhms and an emitter-base resistor (R2) of 47 kOhms, yielding a typical resistance ratio of 10. Key electrical parameters include a minimum DC current gain (hFE) of 140 at 100 mA and 2 V, a transition frequency of 260 MHz, and a power dissipation rating of 150 mW. It is housed in an EMT3 (SOT-416) surface-mount package.

Feature Summary

• Integrates NPN bipolar junction transistor with thin-film bias resistors to eliminate external components.
• Provides high-speed switching capability with a transition frequency of 260 MHz.
• Features low saturation voltage for efficient signal inversion applications.

Applications

• General-purpose logic level shifting and signal inversion circuits.
• Driver stages for relays, solenoids, or small loads requiring moderate current.
• Interface circuits between microcontrollers and peripheral devices.

Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before finalizing any hardware architecture. Confirm that the EMT3 package dimensions align with existing PCB footprints. Ensure supply chain availability accounts for potential end-of-life constraints associated with this specific manufacturing phase.

Selection Notes

Select this component when a 12 V breakdown voltage and 500 mA current capacity are required in a compact SMD form factor. The fixed 4.7 kOhm input resistance suits standard logic families. Consider complementary PNP variants if negative logic control is necessary. Validate thermal performance within the 150 C maximum operating temperature limit during integration.

Part Context

This part belongs to the DTD543 series of digital transistors from ROHM Semiconductor. It shares functional similarities with other pre-biased transistors but is distinguished by its specific 12 V rating and 500 mA current handling. The Z suffix typically denotes specific internal resistor values and packaging variations within the manufacturer's lineup.

Replacement Considerations

Publicly confirmed direct substitutes are not available in the provided documentation. Engineering teams should evaluate alternative ROHM models such as the DTC143 series for different voltage ratings or the DTA143 series for PNP polarity requirements, ensuring pin compatibility and electrical parameter matching.