UNRF1A400A

Overview

The Panasonic UNRF1A4 is a silicon PNP epitaxial planar transistor with built-in resistors, designed for digital circuits. It utilizes an ML3-N2 ultraminiature leadless package measuring 0.6 mm by 1.0 mm with a height of 0.39 mm. The device features a collector-base voltage (V_CBO) and collector-emitter voltage (V_CEO) rating of -50 V. It supports a maximum collector current of -80 mA and total power dissipation of 100 mW at 25°C. Key electrical characteristics include a forward current transfer ratio (h_FE) of 80 at -5 mA, a transition frequency (f_T) of 80 MHz, and an input resistance (R1) of 10 kΩ.

Feature Summary

• Integrates internal base and emitter resistors to simplify circuit design and reduce component count.
• Ultraminiature leadless package enables high-density mounting and equipment downsizing.
• Suitable for standard applications in office equipment, communications, and household appliances.

Applications

• Digital logic interface circuits
• Signal switching applications
• General electronic equipment

Procurement Notes

Verify the current lifecycle status directly with Panasonic before procurement, as this component may be subject to maintenance or discontinuation plans. Confirm that the specific package dimensions and pinout align with your PCB footprint requirements. Ensure compliance with RoHS directives if applicable to your manufacturing standards.

Selection Notes

Select this component when space constraints require an ultraminiature footprint with integrated biasing resistors. Verify that the -50 V voltage ratings and -80 mA current limits meet the operational requirements of the target digital circuit. Consider the thermal management capabilities given the 100 mW power dissipation limit in the small leadless package.

Part Context

This part belongs to Panasonic's lineup of transistors with built-in resistors, specifically engineered for compact digital circuitry. The ML3-N2 package represents a specialized form factor distinct from standard surface-mount packages, prioritizing minimal board area occupation while maintaining necessary electrical isolation and performance for signal processing tasks.

Replacement Considerations

Consult official Panasonic documentation for verified substitute part numbers. Cross-referencing requires matching the PNP configuration, built-in resistor values, ML3-N2 package dimensions, and -50 V voltage ratings to ensure functional compatibility without redesigning the host circuit.

FAQ

What are the internal resistor values?

The datasheet specifies an input resistance (R1) of 10 kΩ with a tolerance of ±30%. The resistance ratio R1/R2 is listed as 0.21 typical, but exact individual values for R2 are not explicitly detailed in the provided text.

What is the maximum operating temperature?

The junction temperature (Tj) maximum rating is 125°C. The storage temperature range is specified as -55°C to +125°C.

Is this component suitable for automotive applications?

No. The datasheet explicitly states that these products are intended for standard applications such as office equipment and household appliances. Special applications like automobiles require separate consultation due to higher reliability requirements.