Product Overview
Military-Grade Small Signal Silicon Transistor TO-92 125°C Rated
Condition
Unused, New Old Stock (NOS). Visual inspection completed with no issues noted. Source unknown. Three units available.
Ships same business day. Hard-to-find parts since 1999. Fair prices, real help.
Product Overview
Fairchild S19254 is a silicon NPN small-signal transistor originally produced for high-reliability military and aerospace programs. The "S" prefix in Fairchild's nomenclature designated special or selected devices built to tighter performance criteria than standard commercial equivalents. Rated for 60V collector-emitter operation and 0.2 watt power dissipation, the S19254 is intended for low-power switching and amplification tasks in precision circuits.
Housed in a TO-92 plastic package and specified for operation up to 125°C, this device reflects an era when discrete transistors were screened for demanding environmental conditions. As an End-of-Life component, available units are limited to remaining legacy inventory.
Key Features
- Part number: S19254
- Polarity: NPN silicon transistor
- Maximum collector-emitter voltage: 60V DC
- Power dissipation: 0.2 W (200 mW) at 25°C
- Operating temperature rating up to 125°C
- TO-92 plastic package
- Originally manufactured for military-grade applications
- Suitable for low-power switching and signal amplification
Applications
- Legacy military or aerospace electronics repair
- Radar and communications hardware restoration
- Precision small-signal amplification stages
- Low-power driver circuits
- Industrial control board maintenance
- Vintage discrete transistor projects
- Replacement in circuits specifying Fairchild S-series devices
Frequently Asked Questions
Is this a power transistor?
No. With a 0.2 watt dissipation rating, it is intended for small-signal switching and amplification rather than high-power applications.
What is the maximum voltage rating?
The maximum collector-emitter voltage is rated at 60V DC.
What temperature range does it support?
It is specified for operation up to 125°C, consistent with military-grade temperature requirements.
Is this still in production?
No. The S19254 is an End-of-Life device and available only as remaining legacy inventory.
Can a standard NPN transistor replace this?
Replacement suitability depends on the original circuit requirements. "S" series devices were often selected for specific performance criteria, so matching voltage, power, and environmental ratings is important.
Built for circuits that could not afford surprises. If you are restoring hardware that calls out Fairchild S-series silicon, this S19254 keeps the design period-correct and electrically aligned.
