Product Overview
Siliconix UC4250C Monolithic Dual N-Channel JFET, Ultra-Low Leakage, TO-99 Metal Can, 8 Gold Leads
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Markings legible: UC4250C, date/batch code 3279, Siliconix S logo. Eight gold-plated leads straight and undamaged.
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Product Overview
Siliconix UC4250C - monolithic dual N-channel JFET in a TO-99 metal can. Two N-channel JFETs on a single chip deliver ultra-low leakage current and stable operation over temperature, making this the go-to building block for high input impedance, low-drift analog front ends. The 8-lead configuration with gold-plated headers and leads fits precision circuit layouts where standard plastic packages fall short.
Key Features
- Monolithic dual N-channel JFET on a single chip
- Ultra-low leakage current
- TO-99 metal can package
- 8-lead configuration
- Gold-plated headers and leads
- Date/batch code 3279 stamped on canister housing
Applications
- Low-drift differential input stages in precision bench multimeters and calibration instruments
- Electrometer front ends where picoamp-level input currents matter
- High input impedance op-amp input buffers in instrumentation amplifiers
- Low-noise preamplifiers for audio and measurement circuits
- Restoring or maintaining vintage test equipment that originally specified this part
- Breadboard experimentation and analog circuit design for makers learning differential JFET topologies
Frequently Asked Questions
Is this the actual UC4250C or a relabeled substitute?
This is the genuine Siliconix UC4250C. The part number UC4250C and date/batch code 3279 are stamped directly on the metal canister housing, and the crisp Siliconix S logo is present and legible. Sourced from a distributor consolidating legacy inventory.
What package is this, and will it fit a TO-99 footprint?
TO-99 metal can, 8-lead configuration. It fits any board or socket designed for the standard TO-99 8-lead pinout. Confirm your specific layout matches before ordering.
Is a datasheet or documentation included?
Not included. This is a component sale only.
Can this substitute for a single JFET in a single-JFET circuit?
The UC4250C contains two N-channel JFETs on one chip in an 8-lead TO-99 package. It is not a pin-compatible drop-in for single JFET packages. Verify your circuit's pinout and bias requirements match a dual JFET configuration before use.
Siliconix built these in metal cans for a reason - when your signal is measured in picoamps, the package matters as much as the silicon. This one has been waiting in inventory for the circuit that deserves it.
