FJX3005RTF

Overview

The FJX3005R is an NPN epitaxial silicon transistor with built-in bias resistors, designed for switching applications. It operates with a collector-emitter voltage of 50 V and a collector current of 100 mA. The device features a typical DC current gain (hFE) of 30 at 5 mA and a low saturation voltage of 0.3 V. Key electrical parameters include a cutoff frequency of 250 MHz and an output capacitance of 3.7 pF. The internal resistor network consists of R1 (4.7 kΩ nominal) and R2 (10 kΩ), facilitating direct interface with logic circuits. Packaged in SOT-323, it supports surface mount installation.

Feature Summary

• Integrated bias resistor network simplifies circuit design by eliminating external components.
• Optimized for high-speed switching with a 250 MHz transition frequency.
• Low saturation voltage ensures efficient power dissipation during conduction.
• Compact SOT-323 package suitable for space-constrained surface mount applications.

Applications

• Switching circuits
• Inverter applications
• Interface circuits
• Driver circuits

Procurement Notes

Verify the specific suffix 'T' or absence thereof against the manufacturer's current ordering guide to confirm packaging type, as standard datasheets may not specify reel quantities. Confirm RoHS compliance status for the exact lot code purchased. Ensure the component matches the original Fairchild Semiconductor specifications if sourcing from third-party distributors.

Selection Notes

Select this component when a compact NPN switch with integrated base drive is required. The built-in 4.7 kΩ resistor allows direct connection to standard logic outputs without additional base current limiting. Consider the 100 mA current limit and 50 V voltage rating to ensure operation within safe limits for the target load.

Part Context

This component belongs to the FJX series of Bias Resistor Built-In Transistors (BRBTs). It serves as the NPN complement to the P-channel FJX4005R, enabling complementary push-pull configurations in digital logic interfaces. The series is engineered for cost-effective integration in consumer electronics and general-purpose switching tasks.

Replacement Considerations

Direct pin-compatible replacements should be verified against the SOT-323 footprint and internal resistor values. Check for equivalent hFE ranges and VCE(sat) specifications to maintain circuit performance. No specific substitute part numbers are confirmed in the provided documentation.