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Product Detailed Parameters
- Description：JFET N-CH 40V TO18
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：40 V
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：100 mA @ 15 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：6 V @ 500 pA
- Input Capacitance (Ciss) (Max) @ Vds：18pF @ 10V
- Resistance - RDS(On)：40 Ohms
- Power - Max：360 mW
- Operating Temperature：-65°C ~ 200°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-206AA, TO-18-3 Metal Can
- Supplier Device Package：TO-18 (TO-206AA)
- Grade：Military
- Qualification：MIL-PRF-19500/385
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Overview
The MX2N4857 is an N-channel Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. It is a military-grade device equivalent to the MIL-PRF-19500/385 specification, housed in a TO-206AA metal can package. The component operates in depletion mode with a maximum drain-source voltage of 40 V and a gate-source voltage limit of -40 V. It features a maximum feedback capacitance of 8 pF and supports a junction temperature range from -65°C to +200°C.
Feature Summary
- Military-grade reliability compliant with MIL-PRF-19500/385 standards
- High thermal stability supporting operation up to 200°C
- Metal can construction for robust environmental protection
Applications
- High-reliability aerospace electronic systems
- Defense circuitry requiring strict qualification standards
- Precision analog signal processing in extreme environments
Procurement Notes
Verify that the specific order includes the 'MX' prefix to ensure receipt of the JANTX qualified variant rather than the standard commercial or JAN versions. Confirm package integrity upon arrival, as the metal TO-206AA housing requires careful handling to prevent mechanical damage to the leads or case during installation.
Selection Notes
Select this component when a depletion-mode N-channel JFET with military qualification is required. Ensure the design accommodates the TO-206AA through-hole mounting style. Verify that the 40 V breakdown voltage and 8 pF capacitance meet the specific circuit requirements for high-frequency or high-voltage applications.
Part Context
This part belongs to the 2N485x series of N-channel JFETs produced under military specifications. The 'MX' suffix denotes the JANTX quality level, which offers tighter parameter tolerances compared to the base JAN version. These devices are designed for critical applications where standard commercial components do not meet reliability or environmental endurance requirements.
Replacement Considerations
Direct substitutes include the 2N4857 (JAN grade) and other equivalents listed under MIL-PRF-19500/385. Verify pinout compatibility and electrical parameter overlaps before substituting.
