UNR521800L

Overview

The Panasonic UNR521L is a Silicon NPN epitaxial planar transistor with built-in resistors, designed for digital circuits. It features an S-Mini package (EIAJ SC-70) and operates within a collector-emitter voltage of 50 V and a collector current of 100 mA. The device includes two integrated resistors: R1 at 4.7 kΩ and R2 at 4.7 kΩ. Key electrical characteristics include a forward current transfer ratio (hFE) ranging from 60 to 200 at IC = 5 mA and VCE = 10 V, a transition frequency (fT) of 150 MHz, and a total power dissipation of 150 mW. The junction temperature rating reaches 150 °C.

Feature Summary

• Integrates dual resistors into a single compact component to reduce equipment size and part count.
• Supports automated manufacturing through tape packing and magazine packing configurations.

Applications

• Digital logic interface circuits
• General-purpose switching applications in consumer electronics
• Signal conditioning in office equipment

Procurement Notes

Verify the specific lifecycle status on the official Panasonic semiconductor website before finalizing procurement plans. Confirm that the SC-70 package dimensions align with your PCB footprint requirements. Ensure compliance with RoHS Directive standards if required by your regional regulations. Cross-reference the marking code '8Q' to validate the correct variant during incoming inspection.

Selection Notes

Select this component when space constraints require combining a transistor and biasing resistors into one footprint. Verify that the 4.7 kΩ resistor values match your circuit's base drive requirements. Check the hFE ranking to ensure it meets your gain specifications. Consider the 150 mW power dissipation limit under your expected ambient operating conditions.

Part Context

This component belongs to the UNR521x series, which offers various combinations of internal resistors. The UNR521L specifically pairs a 4.7 kΩ base resistor with a 4.7 kΩ collector-to-emitter resistor. This configuration differs from other series members like the UNR521K or UNR521M, which utilize different resistance ratios for distinct circuit topologies.

Replacement Considerations

Consult the official datasheet for confirmed substitute part numbers. Verify pinout compatibility and absolute maximum ratings before substituting any alternative components.

FAQ

What are the specific resistance values for R1 and R2 in the UNR521L?

Both R1 and R2 have a nominal value of 4.7 kΩ.

What is the maximum collector-emitter voltage rating?

The maximum collector-emitter voltage (VCEO) is rated at 50 V.

Does the UNR521L support high-frequency operation?

Yes, it has a transition frequency (fT) of 150 MHz, suitable for standard digital switching speeds.