Product Overview
ASI 2N4924 Hermetic TO-39 NPN Transistor – Unused NOS
This component serves as a discrete NPN transistor for amplification and switching roles in higher-voltage signal paths found in legacy electronics. The metal-can construction supports stable electrical behavior and thermal tolerance, making it suitable where plastic-encapsulated devices are less desirable. A practical tip when working with metal-can devices is to verify lead orientation before installation, as TO-39 / TO-205AD layouts differ from modern molded packages.
Product Condition
Unused, New Old Stock. This transistor has not been installed or placed into service.
Product Overview
The ASI 2N4924 is a JEDEC-designated NPN silicon bipolar transistor supplied in a hermetic TO-39 metal can package. Devices of this type were widely used in industrial, military, and instrumentation electronics where reliability and environmental stability were priorities. The gold-plated leads support dependable solderability in through-hole assemblies.
Key Features
- NPN silicon bipolar transistor
- Hermetic TO-39 / TO-205AD metal can package
- Gold-plated leads for reliable solder connections
- Designed for medium-voltage amplification or switching roles
- Through-hole mounting for traditional PCB layouts
- Metal package supports heat dissipation and stability
- Suitable for extended-temperature environments
Applications
- Small power amplifier stages in analog equipment
- Switching functions in industrial control circuits
- Repair and maintenance of legacy instrumentation
- Replacement part in vintage or aerospace electronics
- Educational or laboratory electronics projects
Frequently Asked Questions
What type of transistor is the 2N4924?
It is an NPN silicon bipolar junction transistor intended for amplification and switching applications.
What package does this transistor use?
This device is housed in a hermetic TO-39 metal can with three through-hole leads.
Is this suitable for modern PCB designs?
It is best suited for through-hole or legacy designs rather than compact surface-mount layouts.
Why are metal-can transistors still used?
Metal-can packages provide mechanical robustness, stable thermal performance, and long-term reliability in demanding environments.
You can use this transistor to restore or maintain analog control stages by installing it into a through-hole PCB or socketed TO-39 footprint, benefiting from its hermetic metal can and gold-plated leads.
