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Product Detailed Parameters
- Description：JFET 2N-CH 25V TO78-6
- Series：-
- Mfr：Vishay Siliconix
- Package：Tube
- FET Type：2 N-Channel (Dual)
- Voltage - Breakdown (V(BR)GSS)：25 V
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：24 mA @ 10 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：2 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：5pF @ 10V
- Resistance - RDS(On)：-
- Power - Max：500 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-78-6 Metal Can
- Supplier Device Package：TO-78-6
- Grade：-
- Qualification：-
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Overview
The U431 is a matched N-channel JFET pair housed in a TO-78 package. It features a two-chip design with a gate-source cutoff voltage range of -2 to -6 V and a minimum breakdown voltage of -25 V. The device provides a minimum forward transconductance of 10 mS, low gate leakage of 15 pA, and a common-mode rejection ratio of 75 dB. Power dissipation is rated at 300 mW per side and 500 mW total.
Feature Summary
- Two-chip matched N-channel JFET pair
- Low gate leakage current
- High common-mode rejection ratio
- Tight differential matching for offset and drift
Applications
- Wideband differential amplifiers
- High-speed comparators
- Impedance converters
Procurement Notes
Verify the specific revision level against the datasheet Document Number 70249. Confirm that the TO-78 package meets the required military processing specifications if applicable. Ensure the selected unit falls within the specified VGS(off) range of -2 to -6 V for the intended circuit design.
Selection Notes
Select the U431 when tight differential matching between two JFETs is required. The device offers high slew rate and low noise characteristics suitable for precision analog applications. Consider the TO-78 package constraints and power dissipation limits during thermal management planning.
Part Context
The U431 belongs to the Vishay Siliconix U430/U431 series of matched JFET pairs. These devices are designed for high-frequency performance, offering good power gain beyond 250 MHz. They serve as discrete alternatives to integrated matched transistor pairs in specialized analog circuits.
Replacement Considerations
The U430 is the primary alternative within the same series, featuring a different VGS(off) range of -1 to -4 V. Verify compatibility based on the specific cutoff voltage requirements of the application before substitution.
FAQ
What is the maximum gate-source breakdown voltage?
The minimum gate-source breakdown voltage (V(BR)GSS) is -25 V.
What is the typical gate leakage current?
The typical gate leakage current (IG) is 15 pA.
What is the common-mode rejection ratio?
The common-mode rejection ratio (CMRR) is 75 dB.
