FJN3304RBU

Overview

The FJN3304RBU is an NPN epitaxial silicon transistor manufactured by Fairchild Semiconductor, designed for switching applications with built-in bias resistors. It features a TO-92 cylindrical plastic package and operates with a maximum collector-emitter voltage of 50 V and a continuous collector current of 0.1 A. The device includes integrated bias resistors with a ratio of 1 (R1 = 22 kΩ, R2 = 22 kΩ), ensuring a minimum DC current gain (hFE) of 56. Complementary to the FJN3303RBU, this component supports inverter, interface, and driver circuits while maintaining compliance with environmental standards.

Feature Summary

• Integrated dual bias resistors with a fixed 1:1 ratio for simplified circuit design
• Optimized for high-speed switching, inversion, and signal interfacing tasks
• Complementary pairing capability with the FJN3303RBU for push-pull configurations

Applications

• Switching circuits requiring minimal external components
• Inverter logic stages in digital systems
• Interface circuits between different voltage domains
• Driver circuits for low-power loads

Procurement Notes

Verify the specific suffix 'RBU' against official Fairchild documentation to confirm tape-and-reel packaging specifications. Ensure the part number matches the exact resistor values and hFE binning requirements for your design. Cross-reference the manufacturer's latest datasheet to confirm RoHS compliance status and lead-free terminal plating details before finalizing procurement orders.

Selection Notes

Select the FJN3304RBU when a compact NPN solution with pre-biased resistors is required for space-constrained designs. Its complementary nature to the FJN3303RBU makes it suitable for balanced push-pull output stages. Verify that the 0.1 A current rating and 50 V voltage limits align with the load requirements. Consider the TO-92 package thermal characteristics for power dissipation constraints in the target application environment.

Part Context

This component belongs to Fairchild's Bias Resistor Built-In (BRBI) transistor family, which integrates base and emitter resistors directly onto the die. These devices simplify circuit layouts by reducing component count and improving switching speed consistency. The FJN3304RBU specifically serves as the NPN counterpart to other variants, offering standardized biasing for common switching topologies without external resistor networks.

Replacement Considerations

Publicly confirmed substitutes include the FJN3303RBU for complementary NPN/PNP roles within the same BRBI series. Verify pinout compatibility and resistor tolerance matching when substituting with equivalent parts from other manufacturers.