Product Overview
Siliconix 2627 N-Channel JFET, TO-92, Factory Binned, Low-Noise Audio and Instrument Grade
Condition
Unused NOS. Visual inspection passed - body clean, leads straight, no damage. Matte black TO-92 body with stamped 2627 and square-framed Siliconix S logo confirmed on face. Green and white paint slash visible on domed top, consistent with factory binning for electrical tolerances. Sourced from an electronics distributor consolidating inventory. Photos show the specific units you will receive.
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Product Overview
Siliconix 2627 N-Channel JFET in a TO-92 plastic package. Part of the E2627 and J2627 series line, engineered for low-noise, high-input-impedance amplification - the characteristics that make this family a go-to for vintage audio restoration and precision instrument repair. The color-coded paint slash on the dome top is Siliconix factory binning, applied at the line to identify units sorted to specific electrical tolerances. For restorers and repair techs, that marking confirms unaltered, authentic factory-sorted stock.
Key Features
- N-Channel Junction Field-Effect Transistor (JFET)
- TO-92 plastic encapsulated package, approximately 5 mm wide per photo measurements
- Low-noise, high-input-impedance amplification characteristics
- Factory color-coded top - green and white paint slash indicating electrical tolerance bin
- Siliconix square-framed S logo and 2627 part number stamped on face, confirmed by photo
- Three straight leads, no damage observed
- Part of the E2627 / J2627 series line
Applications
- Audio repair tech replacing faulty JFETs in a vintage microphone preamplifier, desoldering the old part and fitting the 2627 to restore original low-noise performance without adapter boards or circuit redesign
- Buying multiples to test and sort by pinch-off voltage on a bench meter, building closely matched pairs for balanced stereo channels in a vintage studio mixer or receiver
- Test equipment tech swapping a degraded JFET in the high-impedance input stage of a vintage multimeter, then recalibrating to restore accurate readings
- DIY audio builder dropping a factory-binned through-hole JFET into a discrete preamp circuit where a surface-mount substitute would require an adapter board and may not replicate the original transfer characteristics
- Hobbyist stocking a small bench supply of NOS Siliconix JFETs for ongoing restoration projects, keeping the color-coded bin markings intact as a quick visual sort tool
Frequently Asked Questions
What does the green and white paint on the top mean?
Siliconix applied color-coded paint slashes at the factory to visually bin JFETs by electrical tolerances - essentially a quick sorting mark so production and bench techs could identify which tolerance group a unit belongs to without individual testing. The green and white marking on these units is consistent with that factory practice. The specific tolerance range tied to this color combination for the 2627 series is not confirmed in available documentation.
Is this a direct drop-in for other TO-92 JFETs like the 2SK117 or J201?
The 2627 shares the N-channel JFET architecture and TO-92 package with those parts, but pin configuration and specific electrical parameters - VGS(off), IDSS, transconductance - should be verified against your circuit requirements before substituting. Package form factor matches; exact parametric compatibility depends on the application.
Can I use this in a circuit designed for a bipolar transistor or MOSFET?
No, not as a direct drop-in. JFETs require different biasing than bipolar transistors, and the gate characteristics differ from MOSFETs. The 2627 is suited to circuits designed for N-channel JFETs specifically.
Does this come with a datasheet?
Not included. A specific datasheet for the 2627 was not located in available references. General Siliconix JFET application notes from the era cover the broader series and may provide useful guidance.
Are these sold individually or in lots?
Sold individually. Volume pricing is available - see the price tiers on the listing.
The factory paint slash is still sharp, the leads are still straight, and the bin sort is still intact - these sat in distribution, not in a noisy circuit. Your matched pair starts here.
