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Product Detailed Parameters
- Description：JFET N-Channel -40V Low Ciss
- Series：IFN201
- Mfr：InterFET
- Package：Strip
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：1 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：1.1 V @ 10 nA
- Input Capacitance (Ciss) (Max) @ Vds：4pF @ 20V
- Resistance - RDS(On)：850 Ohms
- Power - Max：350 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The InterFET IFN201ST3 is an N-channel JFET in a surface-mount SOT-23 package, designed for cost-sensitive low-noise applications. It utilizes the InterFET N106A geometry and offers high radiation tolerance. The device features extremely low gate leakage of 750 fA typical at 20V and low input capacitance (CISS) of 3pF typical. Static characteristics include a gate-to-source breakdown voltage of -40V and a forward transconductance (GFS) of 500 µS typical. Maximum ratings specify a continuous power dissipation of 350 mW and an operating junction temperature range from -55°C to 150°C.
Feature Summary
- Utilizes InterFET N106A geometry for optimized performance
- Provides high radiation tolerance suitable for demanding environments
- Features ultra-low gate leakage current and low input capacitance
- Offers RoHS, REACH, and CMR compliance
Applications
- Audio tone control circuits and microphone impedance transformation
- Medical imaging systems and ultrasound equipment
- Radar and communication systems in military/aerospace contexts
- Low leakage switches and signal mixers
Procurement Notes
Verify the specific suffix ST3 indicates bulk packaging in the SOT-23 case. Confirm that the ordering information matches the required quantity limits for tape and reel options if higher volumes are needed. Ensure compatibility with ESD shipping materials as specified for bulk product handling.
Selection Notes
Select the IFN201ST3 when low noise and low leakage are critical for audio or medical preamplifier designs. Consider the IFN201AST3 variant if tighter VGS(OFF) screening between -0.5V and -1.0V is required. Evaluate the IFN202ST3 if higher IDSS ranges up to 4.5 mA are necessary for the application circuit.
Part Context
The IFN201ST3 belongs to the IFN201 family, which includes the IFN201A and IFN202 variants. These parts are targeted at cost-sensitive low noise applications and serve as exact crosses for industry standard JFETs such as the SST201, MMBFJ201, J201, and J202. The family shares similar electrical characteristics but varies in screening bins.
Replacement Considerations
Publicly documented cross-compatible parts include SST201, MMBFJ201, J201, and J202. Similar parts listed by the manufacturer are 2N4338, 2N4339, 2N4867, 2N4868, 2N4869, J201, J202, 2N3458, 2N3459, and 2N3460. Verify pinout compatibility as source and drain pins are interchangeable in the SOT-23 package.
