TPQ3904

Overview

The TPQ3904 is a bipolar junction transistor (BJT) array manufactured by Allegro MicroSystems. It contains four NPN transistors in a single package, designed for through-hole mounting. The device features a collector-emitter breakdown voltage of 40V and a maximum power dissipation of 2W. Its transition frequency is rated at 250MHz, supporting high-speed switching applications. The operating temperature range extends from -55°C to 150°C. The component utilizes a 14-pin DIP package configuration.

Feature Summary

• Integrates four independent NPN transistors within a single encapsulated unit
• Supports high-frequency operation with a 250MHz transition frequency rating
• Provides robust thermal performance across an extended industrial temperature range

Applications

• High-speed switching circuits requiring multiple matched NPN elements
• Amplification stages in analog signal processing systems
• Logic interface drivers utilizing through-hole mounting constraints

Procurement Notes

Verify the specific manufacturer source when ordering, as Allegro MicroSystems products may be distributed through authorized channels or secondary markets like Rochester Electronics. Confirm that the 14-DIP package matches the target PCB footprint. Ensure the application environment stays within the specified -55°C to 150°C operating range to maintain reliability. Check for any specific handling requirements associated with plastic/epoxy packages during assembly.

Selection Notes

Select this component when a design requires four identical NPN transistors with matching characteristics in a single package to save board space. The 40V voltage rating suits low-to-medium voltage logic and signal levels. Consider the 2W power dissipation limit for thermal management planning. The through-hole format is appropriate for legacy boards or high-reliability mechanical mounting needs where surface mount alternatives are unsuitable.

Part Context

This part belongs to the family of bipolar transistor arrays offered by Allegro MicroSystems. It serves as a discrete semiconductor solution for integrating multiple switching elements. The 14-pin DIP form factor aligns with traditional electronic assembly methods. It functions as a standalone active component rather than an integrated circuit with complex digital logic.

Replacement Considerations

Direct substitutes must match the 4NPN quad configuration, 40V V(BR)CEO, and 14-DIP package. Verify pinout compatibility before swapping. Generic BJT arrays may differ in transition frequency or power ratings. Consult official datasheets for equivalent parts from other manufacturers to ensure electrical parameter alignment.