UNR921DJ0L

Overview

The UNR921DJ0L is a Silicon NPN epitaxial planar transistor with built-in resistors, designed for digital circuits. It features an SS-Mini3-F1 package (EIAJ SC-89) with three pins. The device has a collector-emitter voltage rating of 50 V and a collector current capacity of 100 mA. Total power dissipation is rated at 125 mW. The internal configuration includes a base resistor (R1) of 47 kΩ and an emitter resistor (R2) of 10 kΩ. The forward current transfer ratio (hFE) ranges from 30 to 60 under standard conditions.

Feature Summary

• Integrates two bias resistors within a single compact package to reduce component count and board space.
• Utilizes an SS-Mini type surface-mount package suitable for automatic insertion via tape packing.
• Designed specifically for digital circuit applications requiring downsizing and cost reduction.

Applications

• Digital logic interface circuits
• Switching applications in consumer electronics
• General-purpose signal processing in office equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest product standards before purchase. Confirm that the component meets the required RoHS compliance and halogen-free specifications for the target assembly process. Ensure the storage and handling conditions align with the moisture sensitivity level defined in the datasheet to prevent package damage during soldering.

Selection Notes

Select this component when a pre-biased NPN transistor with a 4.7 resistance ratio between base and emitter resistors is required. The 47 kΩ base resistor suits moderate drive currents, while the 10 kΩ emitter resistor provides stability. Verify that the 125 mW power dissipation limit accommodates the thermal environment of the final application design.

Part Context

This part belongs to the Panasonic UNR921xJ series of transistors with built-in resistors. The series offers various resistor combinations to suit different digital switching requirements. The UNR921DJ variant specifically pairs a 47 kΩ base resistor with a 10 kΩ emitter resistor, distinguishing it from other series members like the UNR9210J or UNR921AJ which feature different resistance values or single-resistor configurations.

Replacement Considerations

Direct substitutes include other UNR921xJ series parts with identical pinout and electrical ratings but different resistor values, such as UNR921EJ or UNR921FJ, if the resistance ratio can be adjusted in the circuit design. Cross-brand equivalents must match the 50V VCEO, 100mA IC, and SSMini3 package dimensions.