UNR421400A

Overview

The UNR421400A is a single NPN silicon epitaxial planar transistor with built-in bias resistors, designed for digital circuits. It features an NS-B1 package with three pins. Absolute maximum ratings include a collector-emitter voltage of 50 V, a collector current of 100 mA, and a total power dissipation of 300 mW at 25°C. The junction temperature range extends up to 150°C. Electrical characteristics specify a forward current transfer ratio (hFE) minimum of 80 at IC = 5 mA and VCE = 10 V. The transition frequency is 150 MHz. Internal resistance values are R1 = 10 kΩ and R2 = 47 kΩ.

Feature Summary

• Integrates bias resistors to reduce component count and equipment size
• Utilizes an S-type radial taping package for automated supply
• Complies with the RoHS Directive

Applications

• Digital circuits
• General electronic equipment
• Office equipment
• Communications equipment
• Measuring instruments

Procurement Notes

Verify the specific ordering suffix against official Panasonic documentation to confirm packaging details such as tape and reel specifications or quantity per container. Confirm the current lifecycle status, as this series may be subject to maintenance or discontinuation plans. Ensure compliance with export control regulations if applicable to your region.

Selection Notes

Select the UNR421400A when a pre-biased NPN transistor is required for logic interfacing or switching applications. Verify that the internal resistor values (10 kΩ base, 47 kΩ emitter) align with the circuit design requirements. Ensure the operating conditions remain within the specified absolute maximum ratings to prevent device failure.

Part Context

This component belongs to the UNR421x Series, which includes various part numbers differentiated by their internal resistor configurations. The series is manufactured by Panasonic Electronic Components using silicon NPN epitaxial planar technology. It serves as a compact solution for replacing discrete transistor and resistor networks in standard applications.

Replacement Considerations

Consult official Panasonic documentation for verified substitute part numbers within the UNR421x family or equivalent components from other manufacturers. Ensure any replacement matches the electrical characteristics, pin configuration, and package dimensions.