UNR723100L

Overview

The Panasonic UNR7231 is a silicon NPN epitaxial planar pre-biased transistor designed for low-frequency amplification. It integrates internal resistors R1 (1 kΩ) and R2 (47 kΩ) to reduce component count and equipment size. Key electrical parameters include a collector-emitter breakdown voltage of 20 V, a continuous collector current of 0.7 A, and a peak collector current of 1.5 A. The device features a high forward current transfer ratio with a minimum hFE of 800 at IC = 150 mA. Total power dissipation reaches 1.0 W under standard thermal conditions, operating within a junction temperature range up to 150°C.

Feature Summary

• High forward current transfer ratio for efficient signal amplification
• Integrated base and emitter-base resistors simplify circuit design
• MiniP3-F1 surface mount package enables board space reduction

Applications

• Low-frequency amplification circuits
• General electronic equipment
• Office equipment
• Communications equipment
• Household appliances

Procurement Notes

Verify the specific lifecycle status before procurement, as the datasheet indicates maintenance or discontinuation stages may apply. Confirm that the MiniP3-F1 package dimensions align with the target PCB footprint. Ensure the 20V rating meets the maximum voltage requirements of the intended application environment.

Selection Notes

Select this component when a high-gain NPN switch or amplifier is required in a compact form factor. The integrated 1kΩ input resistor simplifies drive circuitry compared to discrete transistors. Verify that the 0.7A continuous current limit satisfies the load requirements, noting the 1.5A peak capability for transient states.

Part Context

The UNR7231 belongs to the UNR series of pre-biased transistors manufactured by Panasonic Electronic Components. This series consolidates bipolar junction transistors with built-in biasing resistors to minimize external components. The part utilizes the MiniP3-F1 surface-mount package, offering a compact solution for modern electronics manufacturing.

Replacement Considerations

Consult official Panasonic documentation for verified substitute part numbers. Cross-referencing should prioritize matching the MiniP3-F1 package, 20V VCEO rating, and NPN polarity. Ensure any replacement maintains similar hFE characteristics and internal resistance values.