DTB543EETL

Overview

The DTB543EETL is a PNP digital transistor manufactured by ROHM Semiconductor, featuring integrated bias resistors for simplified circuit design. It operates with a collector-emitter voltage of 12 V and supports a continuous collector current of 500 mA. The device includes a base resistor (R1) of 4.7 kOhms and an emitter-base resistor (R2) of 4.7 kOhms, yielding a typical resistance ratio of 10. Key electrical parameters include a minimum DC current gain (hFE) of 115 at 100 mA and 2 V, a saturation voltage of 300 mV at 5 mA base and 100 mA collector currents, and a transition frequency of 260 MHz. Power dissipation is rated at 150 mW, housed in an EMT3 (SOT-416) surface-mount package.

Feature Summary

• Integrates dual bias resistors to reduce component count and simplify digital switching circuits.
• Provides high current gain and low saturation voltage for efficient signal switching.
• Engineered for high-frequency operation with a transition frequency up to 260 MHz.

Applications

• Digital logic interface circuits
• Switching applications in consumer electronics
• General-purpose digital signal buffering

Procurement Notes

Verify the specific ordering suffix to ensure correct packaging configuration, such as cut tape versus reel quantities. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into production lines. Cross-reference manufacturer datasheets for updated reliability data and recommended soldering profiles to maintain component integrity during assembly processes.

Selection Notes

Select this component when a PNP digital transistor with 12 V rating and 500 mA capacity is required. The 4.7 kOhm input resistance suits standard logic levels. Compare against NPN alternatives like DTC114EETL if polarity differs. Ensure the EMT3 package fits the PCB footprint constraints and thermal management needs relative to the 150 mW power dissipation limit.

Part Context

This part belongs to the DTB543 series of pre-biased transistors from ROHM Semiconductor. It shares the core transistor structure with variants differing primarily in resistance values or packaging. The EMT3 package offers a compact form factor suitable for space-constrained modern electronic designs requiring reliable digital switching performance.

Replacement Considerations

Direct substitutes within the same family may include DTB543EM, though availability status varies. Verify pin compatibility and electrical parameter equivalence before substitution. Alternative packages like SOT-723 require mechanical re-evaluation.