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Product Detailed Parameters
- Description：JFET N-Channel -50V Low Ciss
- Series：SMP4338
- Mfr：InterFET
- Package：Tape & Reel (TR)
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：50 V
- Current - Drain (Idss) @ Vds (Vgs=0)：40 µA @ 15 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：700 mV @ 100 nA
- Input Capacitance (Ciss) (Max) @ Vds：3pF @ 15V
- Resistance - RDS(On)：1.2 kOhms
- 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 SMP4338TR is a surface-mount N-channel JFET from InterFET, packaged in SOT-23 and supplied in tape and reel. It features an InterFET N0016H geometry with low gate leakage of less than 750fA typical at room temperature. The device exhibits a low input capacitance (Ciss) of 7pF typical and a forward transconductance ranging from 600 to 1800 μS. It offers high radiation tolerance and complies with RoHS, REACH, and CMR standards.
Feature Summary
- Utilizes proprietary InterFET N0016H geometry for exceptionally high radiation tolerance
- Provides extremely low gate leakage current, typically under 750fA at room temperature
- Features low input capacitance and low noise characteristics suitable for precision amplifier stages
- Supports custom test and binning options alongside standard SMT packaging
Applications
- Low noise precision amplifier stages
- Radar and satellite communications systems
- Medical imaging systems and ultrasound equipment
- Hydrophone preamplifiers and missile guidance systems
Procurement Notes
Verify the specific ordering suffix to confirm the tape and reel quantity limits, as the datasheet indicates maximums of 3,000 pieces for 7-inch reels and 9,000 pieces for 13-inch reels. Ensure that the required electrical parameters align with the minimum and maximum ranges specified for the 2N4338 variant in the static characteristics table before finalizing procurement.
Selection Notes
Select this component when designing circuits requiring high radiation tolerance and ultra-low leakage currents. The SMP4338TR is appropriate for applications where low input capacitance is critical for signal integrity. Consider the SOT-23 package constraints regarding thermal power dissipation and derating values if operating near the maximum junction temperature limits defined in the datasheet.
Part Context
This part belongs to the InterFET 2N4338/2N4339 family of N-channel JFETs designed for -50V operation. It serves as a surface-mount alternative to through-hole variants like the TO-18 or TO-92 packages. The device is engineered to replace industry standard crosses such as the 2N3460 and MMBFJ201 while offering superior radiation hardness and lower noise performance.
Replacement Considerations
Public confirmed substitutes include the 2N3460, 2N3969, 2N4220, 2N4867, 2N4868, MMBFJ201, MMBFJ202, SST201, SST202, and SST230. InterFET similar parts such as IFN201, IFN202, SMP3460, and SMPJ201 are also documented as compatible alternatives.
