UNR321300L

Overview

The Panasonic UNR321300L is an NPN pre-biased bipolar junction transistor (BJT) designed for digital circuits. It integrates a monolithic bias network consisting of two resistors: R1 and R2, both rated at 47 kΩ. The device operates with a maximum collector-emitter voltage of 50 V and a continuous collector current of 100 mA. Key electrical characteristics include a DC current gain (hFE) of 80 at IC=5mA/VCE=10V, a saturation voltage of 250 mV at IB=0.3mA/IC=10mA, and a transition frequency of 150 MHz. Total power dissipation is limited to 100 mW.

Feature Summary

• Integrates dual bias resistors (R1 and R2) into a single compact package to reduce component count.
• Optimized for downsizing equipment and facilitating high-density surface mounting.
• Designed to contribute to low power consumption in digital circuit applications.

Applications

• General-purpose digital logic circuits
• Switching applications in office equipment
• Communications equipment signal processing
• Household appliance control boards

Procurement Notes

Verify the specific suffix 'L' against the manufacturer's latest documentation to confirm packaging configuration. Confirm current lifecycle status as the datasheet indicates maintenance or discontinuation phases for this series. Ensure compliance with RoHS requirements if applicable to the target market. Validate that the SSSMini3-F1 package dimensions match the PCB footprint design constraints.

Selection Notes

Select this component when a compact NPN solution with integrated base and emitter-base resistors is required. The 47kΩ resistor values are suitable for standard TTL or CMOS logic interfacing. Consider the 150 MHz transition frequency for moderate-speed switching applications. Verify thermal management capabilities given the 100 mW total power dissipation limit in the small SSSMini3-F1 package.

Part Context

This part belongs to the Panasonic UNR321x series of silicon NPN epitaxial planar transistors. The series includes variants with different internal resistance configurations, such as the UNR3210 (single 47kΩ resistor), UNR3216 (single 4.7kΩ resistor), and UNR321N (4.7kΩ/47kΩ). The UNR321300L specifically utilizes the dual 47kΩ configuration within the SSSMini3-F1 surface-mount package.

Replacement Considerations

Direct substitutes must match the NPN pre-biased topology, 50V rating, 100mA current, and identical 47kΩ/47kΩ internal resistor network. Verify pinout compatibility with the SSSMini3-F1 package. Check for equivalent hFE and fT specifications to ensure circuit performance parity.

FAQ

What are the specific values of the internal resistors in the UNR321300L?

The UNR321300L contains two internal resistors: R1 (Base resistor) is 47 kΩ and R2 (Emitter-Base resistor) is also 47 kΩ.

What is the maximum collector current for this transistor?

The absolute maximum rating for the collector current (IC) is 100 mA at an ambient temperature of 25°C.

How does the UNR321300L differ from the UNR3210?

The UNR321300L includes two internal resistors (R1 and R2, both 47 kΩ), whereas the UNR3210 includes only one internal resistor (R1, 47 kΩ).