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Product Detailed Parameters
- Description：JFET N-CH 35V TO92
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：35 V
- Drain to Source Voltage (Vdss)：30 V
- Current - Drain (Idss) @ Vds (Vgs=0)：25 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：-
- Input Capacitance (Ciss) (Max) @ Vds：10pF @ 12V (VGS)
- Resistance - RDS(On)：60 Ohms
- Power - Max：310 mW
- Operating Temperature：-65°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Supplier Device Package：TO-92 (TO-226)
- Grade：-
- Qualification：-
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Overview
The Fairchild Semiconductor 2N5639 is a single N-channel Junction Field-Effect Transistor (JFET) housed in a TO-92 cylindrical package. It operates in enhancement mode with three leads. Key electrical parameters include a maximum drain-source on-resistance of 60 Ω and a maximum feedback capacitance (Crss) of 4 pF. The device supports a maximum power dissipation of 0.31 W and functions at temperatures up to 150 °C. It is available in lead-free RoHS-compliant versions.
Feature Summary
- Single N-channel JFET configuration
- Enhancement mode operation
- Low feedback capacitance for signal integrity
Applications
- General-purpose discrete semiconductor switching
- Amplifier circuits requiring low noise
- Electronic signal processing components
Procurement Notes
Verify the specific manufacturing lot against the required compliance standards, as historical data indicates variations between lead-free RoHS-compliant units and older tin/lead versions. Confirm the package orientation and lead spacing match the target PCB footprint before finalizing orders. Ensure the supplier provides official datasheets to validate the enhancement mode characteristics and maximum ratings.
Selection Notes
Select this component when an N-channel JFET with enhancement mode capability is required in a through-hole TO-92 package. Consider the 60 Ω on-resistance and 4 pF feedback capacitance limits for circuit design. Verify thermal management requirements against the 0.31 W power dissipation rating and ensure the operating temperature range fits the application environment.
Part Context
The 2N5639 belongs to the standard N-channel JFET family produced by Fairchild Semiconductor. It is distinct from MOSFETs despite some datasheet classifications mentioning metal-oxide technology; it is fundamentally a junction FET. The part is often compared with other small-signal transistors in the TO-92 form factor for general electronic applications.
Replacement Considerations
Cross-reference with equivalent N-channel JFETs in TO-92 packages. Verify pinout compatibility and electrical parameter overlaps, specifically drain-source resistance and capacitance, before substituting.
