Product Overview
Legacy 2N3745 NPN Power Transistor with Gold Metal Case
This component is a medium-power transistor designed for linear and switching roles in earlier solid-state equipment. Devices of this class were widely used in industrial, audio, and OEM electronics where rugged through-hole mounting and effective heat transfer were required. When servicing legacy hardware, matching the original JEDEC transistor type and mounting style is often essential. This part reflects the silicon / discrete power era of transistorized design.
Product Condition
Unused, New Old Stock. This transistor has never been installed and remains preserved from original production-era inventory.
Product Overview
The Solid State, Inc. 2N3745 is a JEDEC-numbered silicon NPN power transistor intended for medium-power amplification and control applications. The 2N3745 designation was used by multiple U.S. manufacturers and specified directly in equipment documentation. It is associated with through-hole, heatsink-mounted designs and is now primarily used for form-fit-function replacement in vintage and legacy electronics.
Key Features
- Silicon NPN power transistor
- JEDEC-standard 2N3745 designation
- Medium-power, high-dissipation device class
- Designed for linear amplifier and switching stages
- Gold-finish metal power case
- Through-hole, chassis or heatsink mounting style
- Includes mica insulator for electrical isolation
- Includes original through-hole mounting hardware
Applications
- Restoration of vintage audio power amplifiers
- Repair of linear power supplies and regulators
- Industrial control and driver circuitry maintenance
- OEM equipment built around JEDEC-specified transistors
- Form-fit-function replacement in legacy power stages
Frequently Asked Questions
What type of transistor is the 2N3745?
It is a silicon NPN power transistor designed for medium-power amplification and control applications.
Is this intended for modern circuit design?
This transistor is best suited for maintaining or restoring existing designs rather than for new product development.
Does this include mounting accessories?
Yes. This listing includes the original through-hole mounting hardware and a mica insulator for heatsink installation.
Why is the gold metal case significant?
The metal case provides mechanical strength and efficient thermal coupling to a heatsink, which was standard for power transistors of this class.
You can restore a vintage audio power amplifier or linear regulator by mounting this silicon NPN power transistor to the original heatsink using the included mica insulator and hardware specified by the equipment design.
