UNR421K00A

Overview

The UNR421K00A is a Silicon NPN epitaxial planar transistor with built-in resistors, designed for digital circuits. It features an NS-B1 package with three pins: Emitter (Pin 1), Collector (Pin 2), and Base (Pin 3). The device has a maximum collector-emitter voltage of 50 V and a collector current rating of 100 mA. Total power dissipation is rated at 300 mW. The internal configuration includes a base resistor (R1) of 10 kΩ and an emitter resistor (R2) of 4.7 kΩ. The forward current transfer ratio (hFE) ranges from 20 to 460 depending on the rank classification.

Feature Summary

• Reduces equipment size and component count by integrating biasing resistors directly into the transistor package.
• Utilizes a new S-type package that supports radial taping supply methods.

Applications

• Digital circuit switching applications
• General electronic equipment such as office machines and measuring instruments

Procurement Notes

Verify the specific ordering suffix against official Panasonic documentation to confirm exact resistance values and packaging type. Confirm compliance with RoHS Directive requirements prior to procurement. Ensure the latest product standards are consulted during the purchasing phase to account for potential specification changes or lifecycle status updates.

Selection Notes

Select this component when a compact NPN transistor with integrated biasing is required for digital logic interfaces. Verify that the 10 kΩ base resistor and 4.7 kΩ emitter resistor align with the target circuit design parameters. Ensure the operating ambient temperature remains within the specified range to maintain performance characteristics.

Part Context

This part belongs to the UNR421x Series, which comprises various configurations of transistors with built-in resistors. The series offers different resistor combinations to suit diverse digital circuit needs while maintaining a consistent physical footprint and electrical interface structure across the family.

Replacement Considerations

Consult official cross-reference data for verified substitutes. Ensure any replacement maintains the same pinout configuration and electrical ratings to guarantee compatibility in existing designs.