UNR421800A

Overview

The Panasonic UNR421800A is a Silicon NPN epitaxial planar transistor with built-in resistors, designed for digital circuits. It features an NS-B1 package with radial taping supply. Key absolute maximum ratings include a collector-base voltage (V_CBO) of 50 V, collector-emitter voltage (V_CEO) of 50 V, collector current (I_C) of 100 mA, and total power dissipation (P_T) of 300 mW at 25°C. The junction temperature reaches 150°C. Electrical characteristics specify a forward current transfer ratio (h_FE) of 20 to 460 depending on the rank, a collector-emitter saturation voltage (V_CE(sat)) of 0.25 V max at I_C = 10 mA, and a transition frequency (f_T) of 150 MHz.

Feature Summary

• Integrates two internal resistors to reduce component count and equipment size
• Utilizes an NS-B1 package compatible with radial taping supply methods

Applications

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

Procurement Notes

Verify the specific part number against official Panasonic documentation to confirm availability status. This component may be subject to maintenance or discontinuation plans. Confirm compliance with RoHS Directive requirements before procurement. Ensure sourcing channels provide valid authorization and quality certifications.

Selection Notes

Select based on required resistor values and h_FE ranking. Verify that operating conditions remain within absolute maximum ratings. Consider thermal management for power dissipation limits. Check compatibility with standard digital logic levels and input/output voltage requirements.

Part Context

This component belongs to the UNR421x Series of transistors with built-in resistors. It serves as a discrete solution for digital logic interfacing where space savings and simplified circuit design are prioritized over high-frequency analog performance.

Replacement Considerations

Consult official Panasonic resources for verified substitute part numbers within the UNR421x series or equivalent NPN transistor-resistor combinations. Cross-referencing requires matching electrical parameters and package dimensions.