FFB3904

Overview

The FFB3904 is a dual NPN silicon small-signal transistor housed in a SC-70-6 surface-mount package. It features two independent elements within a single carrier, providing a compact solution for general-purpose amplification and switching applications. The device supports a maximum collector current of 200 mA and a collector-emitter voltage rating of 40 V. Key electrical characteristics include a maximum turn-on time of 38 ns and a maximum turn-off time of 175 ns. The component utilizes matte tin terminal coatings and is designed for lead-free assembly processes.

Feature Summary

• Dual NPN configuration integrating two separate elements into a single compact package
• Optimized for high-speed switching with defined turn-on and turn-off time parameters
• General-purpose design suitable for both amplifier and switch circuit functions

Applications

• General purpose signal amplification circuits
• High-speed digital switching applications
• Compact multi-channel transistor arrays

Procurement Notes

Verify the specific manufacturer datasheet to confirm pinout orientation, as documentation indicates symmetrical pinouts where pin 1 and pin 4 are interchangeable. Ensure the selected variant matches the required SC-70-6 footprint and lead-free compliance standards. Cross-reference absolute maximum ratings against your specific operating conditions to prevent exceeding the 40 V collector-emitter voltage or 200 mA continuous collector current limits during implementation.

Selection Notes

Select this component when space constraints require multiple NPN transistors in a minimal footprint. The dual-element structure simplifies layout compared to discrete single transistors. Verify that the 38 ns turn-on and 175 ns turn-off speeds meet the timing requirements of the target switching frequency. Confirm compatibility with standard surface-mount reflow soldering profiles given the plastic/epoxy packaging material.

Part Context

This device belongs to the family of general-purpose small-signal bipolar junction transistors. It serves as a multi-chip alternative to individual discrete transistors, offering improved board density. The technology is sourced from Process 23, indicating a specific manufacturing lineage for consistent performance characteristics across production batches.

Replacement Considerations

Public confirmed substitute part numbers: FMB3904, MMPQ3904.