UNR31A900L

Overview

The UNR31A900L is a small signal PNP silicon transistor with built-in bias resistors, designed for digital circuits. It features an SSSMini3-F1 surface-mount package with three pins. The device supports a collector-emitter voltage of -50 V and a maximum collector current of -80 mA. Internal resistors are configured as R1 (1 kΩ) and R2 (10 kΩ), yielding a resistance ratio of approximately 0.10. Key electrical characteristics include a forward current transfer ratio (hFE) of 30 at -5 mA and a transition frequency of 80 MHz. Total power dissipation is rated at 100 mW.

Feature Summary

• Integrated dual-resistor network simplifies circuit design by reducing component count.
• Optimized for high-density mounting to facilitate equipment downsizing.
• Designed to contribute to low power consumption in digital applications.

Applications

• General-purpose digital logic circuits
• Switching applications in office equipment
• Signal control in communications equipment

Procurement Notes

Verify the specific ordering suffix against Panasonic Industry's official product standards before purchase. Confirm that the component meets the required RoHS compliance specifications for your region. Ensure the supply chain provides valid traceability documentation. Check for any lifecycle status updates, such as planned maintenance or discontinuation notices, directly from the manufacturer's website to avoid obsolescence risks during production.

Selection Notes

Select this component when a compact PNP switching solution with integrated base drive resistors is required. The fixed resistor values eliminate the need for external biasing components, saving board space. Verify that the -50 V voltage rating and -80 mA current capacity align with the target circuit's operational limits. Consider the thermal derating curves if ambient temperatures exceed standard conditions.

Part Context

This part belongs to Panasonic's lineup of transistors with built-in resistors, specifically engineered for digital circuit applications. The UNR31A9 series utilizes a silicon epitaxial planar structure housed in the SSSMini3-F1 package. These devices are intended for standard electronic equipment rather than specialized high-reliability sectors like aerospace or medical life support systems.

Replacement Considerations

Consult Panasonic Industry's official substitution guide for verified equivalent parts. Do not assume functional compatibility with generic PNP transistors lacking integrated resistors. Verify pinout alignment and electrical parameter margins before implementing any alternative component in the design.

FAQ

What are the internal resistor values?

The device contains two internal resistors: R1 is 1 kΩ and R2 is 10 kΩ.

Is this component suitable for automotive safety applications?

No. The datasheet specifies use for general electronic equipment only and explicitly excludes automotive traffic control or safety devices.

What is the maximum total power dissipation?

The maximum total power dissipation is 100 mW at an ambient temperature of 25°C.