DTD543ZETL

Overview

The DTD543ZETL is a single NPN digital transistor manufactured by Rohm Semiconductor, featuring built-in bias resistors within an EMT3 (SOT-416) surface-mount package. It provides a collector-emitter breakdown voltage of 12 V and supports a maximum continuous collector current of 500 mA. The device includes a base resistor (R1) of 4.7 kΩ and an emitter-base resistor (R2) of 47 kΩ. Key electrical characteristics include a DC current gain (hFE) of at least 140 at 100 mA and 2 V, a saturation voltage of 300 mV max at 5 mA base/100 mA collector, and a transition frequency of 260 MHz. Power dissipation is rated at 150 mW.

Feature Summary

• Integrates NPN bipolar junction transistor with dual internal bias resistors for simplified circuit design.
• Optimized for high-speed switching applications with a transition frequency of 260 MHz.
• Utilizes compact EMT3 surface-mount packaging to minimize board space requirements.

Applications

• General-purpose switching circuits in consumer electronics.
• Driver stages for low-current loads requiring level shifting.
• Logic interface circuits between microcontrollers and peripheral devices.

Procurement Notes

Verify the complete part number including suffixes such as 'TL' to confirm tape-and-reel packaging specifications. Confirm RoHS compliance status and moisture sensitivity level prior to procurement. Ensure the supplier source is authorized to guarantee component authenticity and traceability. Check for any specific handling requirements related to electrostatic discharge during storage and assembly processes.

Selection Notes

Select this component when a 12 V rating and 500 mA current capacity are required for NPN switching. The specific 4.7 kΩ input resistance suits interfaces driven by standard logic levels. Compare against alternative digital transistors if higher voltage ratings or different resistance ratios are needed. Consider thermal management constraints due to the 150 mW power dissipation limit in the small EMT3 package.

Part Context

This component belongs to Rohm's DTD series of digital transistors, which integrate bias resistors directly onto the silicon die. The DTD543 variant specifically denotes the NPN polarity with 12 V breakdown and 4.7 kΩ input resistance. The ZETL suffix indicates the specific packaging and taping configuration used for automated surface-mount assembly.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and electrical parameters before considering any cross-reference components from other manufacturers.