FJX3003RTF

Overview

The FJX3003RTF is a pre-biased NPN epitaxial silicon transistor manufactured by Fairchild Semiconductor, now part of onsemi. It integrates bias resistors within a compact SOT-323 surface-mount package to simplify circuit design and reduce component count. The device features a maximum collector-emitter voltage (VCEO) of 50 V and supports a continuous collector current (IC) of 100 mA. Maximum power dissipation is rated at 200 mW. The built-in resistor network typically consists of two 22 kΩ resistors with a ratio of 1:1, facilitating direct interface with digital logic without external base drive components.

Feature Summary

• Integrates dual bias resistors directly into the transistor structure for simplified circuit topology
• Provides high gain switching capability suitable for low-power applications
• Utilizes a compact SOT-323 surface-mount package to minimize board space requirements

Applications

• Switching circuits in industrial segments
• Interface and driver circuits
• Digital logic inverters

Procurement Notes

Verify manufacturer documentation as Fairchild Semiconductor has been acquired by onsemi; ensure datasheets reflect current onsemi specifications. Confirm RoHS compliance status and lead times through authorized distributors, as availability may vary due to product lifecycle changes. Check for specific ordering suffixes that might indicate packaging variations or updated revision levels.

Selection Notes

Select this component when space-constrained designs require integrated biasing for NPN switching applications. Ensure the required collector current does not exceed 100 mA and the operating voltage remains below 50 V. Consider the thermal limitations imposed by the 200 mW power dissipation rating in the small SOT-323 package during high-duty-cycle operations.

Part Context

This component belongs to the FJX series of Digital Transistors, which are designed to replace discrete resistor-transistor networks. These devices are engineered to reduce assembly costs and improve reliability by minimizing the number of external components required for base drive and pull-up/pull-down functions in standard bipolar junction transistor configurations.

Replacement Considerations

Consult official cross-reference lists from onsemi for verified substitutes. Equivalent parts must match the NPN polarity, 50 V VCEO rating, 100 mA IC capability, and SOT-323 package form factor. Verify internal resistor values and ratios if precise biasing characteristics are critical to the application performance.