FJN4301RTA

Overview

The FJN4301RTA is a pre-biased PNP silicon epitaxial transistor manufactured by onsemi. It integrates a single bipolar transistor with built-in bias resistors in a compact TO-92 package. The device supports a maximum collector current of 0.1 A and a collector-emitter voltage rating of 50 V. Key electrical characteristics include a minimum DC current gain (hFE) of 30. The component is RoHS compliant and lead-free, designed for applications requiring integrated biasing solutions in small signal switching circuits.

Feature Summary

• Integrates a PNP transistor with built-in bias resistors to simplify circuit design
• Utilizes a standard TO-92 cylindrical plastic/epoxy package for through-hole mounting
• Constructed from silicon epitaxial material for reliable small-signal performance

Applications

• General-purpose small signal switching applications
• Low-power logic interface circuits
• Biasing networks in analog signal processing

Procurement Notes

Verify the manufacturer designation carefully, as historical records indicate this part number was also associated with Fairchild Semiconductor prior to corporate restructuring. Confirm that the specific revision matches the required RoHS compliance status and lead-free specifications. Ensure the TO-92 package variant aligns with the intended PCB footprint requirements for the target assembly process.

Selection Notes

Select this component when a pre-biased PNP configuration is required to reduce external component count. The integrated resistor ratio simplifies base drive calculations compared to discrete transistors. Verify that the 50V collector-emitter voltage and 100mA current limits meet the operational demands of the specific switching load. Consider the thermal dissipation capabilities inherent to the TO-92 package for the expected duty cycle.

Part Context

This component belongs to the family of pre-biased transistors offered by onsemi and its predecessor entities. These devices combine a single transistor element with internal biasing resistors to streamline design. The FJN4301RTA specifically addresses the need for PNP switching elements with integrated resistance, distinguishing it from standard discrete bipolar transistors that require external biasing networks.

Replacement Considerations

Cross-reference with other pre-biased PNP transistors in the TO-92 package. Verify pinout compatibility and electrical parameter equivalence, specifically the hFE minimum and voltage ratings, before substituting.