DTD543XETL

Overview

The DTD543XETL is a single NPN digital transistor manufactured by ROHM Semiconductor, featuring built-in bias resistors within an SOT-416 (EMT3) surface-mount package. It operates with a collector-emitter voltage of 12 V and supports a continuous collector current of 500 mA. The device includes a typical input resistor (R1) of 4.7 kOhms and an emitter-base resistor (R2) of 47 kOhms, yielding a resistance ratio of 10. Key electrical parameters include a minimum DC current gain (hFE) of 140 at 100 mA and 2 V, a maximum operating frequency of 260 MHz, and a power dissipation rating of 150 mW. The saturation voltage is specified at 300 mV under standard test conditions.

Feature Summary

• Integrates NPN bipolar junction transistor with dual built-in bias resistors for simplified circuit design.
• Provides high-speed switching capability with a transition frequency up to 260 MHz.
• Features low saturation voltage to minimize power loss during conduction states.

Applications

• General-purpose logic level shifting and interface circuits.
• Driver stages for relays, solenoids, or small motors.
• Switching applications in consumer electronics and industrial control systems.

Procurement Notes

Verify the specific suffix 'TL' corresponds to the tape-and-reel packaging configuration required for automated assembly processes. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering part number matches the exact electrical characteristics defined in the datasheet to avoid functional mismatches in production environments.

Selection Notes

Select this component when a compact NPN solution with integrated base drive resistors is required for space-constrained designs. The 4.7 kOhm input resistance suits direct interfacing with standard logic outputs. Consider the 12 V breakdown voltage limit when designing for higher voltage rails. Evaluate the 150 mW thermal dissipation constraint against expected load currents to ensure reliable operation within the specified temperature range.

Part Context

This part belongs to the DTD543 series of digital transistors from ROHM Semiconductor. It shares the same internal structure as the DTD543XE but utilizes the 'TL' suffix to denote reel packaging. It is distinct from variants like DTC143ZETL which offer different voltage ratings and current capacities. The EMT3 package provides a small footprint suitable for high-density PCB layouts.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Engineers should consult the manufacturer's official cross-reference tools or equivalent product catalogs to identify compatible alternatives that match the SOT-416 package, NPN polarity, and 12 V/500 mA specifications.