UNR521D00L

Overview

The UNR521D00L is a Silicon NPN epitaxial planar transistor with built-in bias resistors, designed for digital circuits. It features an S-Mini3-G1 package (EIAJ SC-70) with three terminals: Base, Emitter, and Collector. The device has a maximum collector current of 100 mA and a total power dissipation of 150 mW at 25°C. Key electrical ratings include a collector-emitter voltage of 50 V and a collector-base voltage of 50 V. For the UNR521D variant, the internal resistor values are R1 = 47 kΩ and R2 = 10 kΩ, resulting in a resistance ratio of approximately 4.7. The minimum forward current transfer ratio (hFE) is 30.

Feature Summary

• Integrates two bias resistors within a single compact package to reduce component count and board space.
• Utilizes an S-Mini type package suitable for automatic insertion via tape or magazine packing.
• Designed specifically for use in digital switching circuits.

Applications

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

Procurement Notes

Verify the specific suffix '00L' against Panasonic's official documentation to confirm packaging details such as reel size or tape specifications. Confirm the product lifecycle status, as this series may be subject to maintenance or discontinuation plans. Ensure compliance with RoHS directives applicable to your region before procurement.

Selection Notes

Select the UNR521D variant when a 47 kΩ base resistor and a 10 kΩ emitter resistor are required for the specific biasing network. Verify that the 100 mA collector current and 50 V voltage ratings meet the circuit requirements. Consider the thermal characteristics and total power dissipation limits when designing for high ambient temperatures.

Part Context

The UNR521D00L belongs to the UNR521x Series (also known as UN521x Series), which comprises various NPN transistors with built-in resistors. This series offers multiple resistor combinations to suit different digital circuit needs while maintaining a consistent small outline package form factor for standardized manufacturing processes.

Replacement Considerations

Consult Panasonic's official cross-reference guides for verified substitute part numbers. Generic equivalents may not match the precise built-in resistor ratios or hFE characteristics defined in the datasheet.