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Product Detailed Parameters
- Description：JFET N-CH 40V TO92-3
- Series：-
- Mfr：onsemi
- Package：Bulk
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：40 V
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：30 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：5 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：16pF @ 20V
- Resistance - RDS(On)：30 Ohms
- Power - Max：625 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The PN4091 is a small-signal N-channel Junction Field-Effect Transistor (JFET) manufactured by onsemi, formerly Fairchild Semiconductor. It operates in depletion mode and is housed in a TO-92 cylindrical plastic package with three leads. Key electrical characteristics include a maximum Drain-Gate Voltage of 40 V and a Gate-Source Voltage of -40 V. The device features a maximum Drain-Source On Resistance (rDS(on)) of 30 Ω at ID = 1.0 mA. Zero-Gate Voltage Drain Current (IDSS) ranges from 30 mA to 40 mA at VDS = 20 V. Thermal resistance junction-to-ambient is 357 °C/W, with a total device dissipation of 625 mW.
Feature Summary
- Designed for low-level analog switching applications
- Suitable for sample and hold circuits
- Compatible with chopper stabilized amplifiers
Applications
- Low level analog switching
- Sample and hold circuits
- Chopper stabilized amplifiers
Procurement Notes
Verify the manufacturer origin, as the component was originally produced by Fairchild Semiconductor before its power management division became onsemi. Confirm the specific package variant (TO-92 vs SOT-23 for MMBF series) matches the design requirements. Ensure the datasheet revision corresponds to the production lot. Check for RoHS compliance status if environmental regulations apply to the final assembly.
Selection Notes
Select the PN4091 when a JFET with high IDSS (30-40 mA) and low rDS(on) (30 Ω) is required for analog signal paths. Compare against PN4092 and PN4093 if lower current or different cutoff voltages are needed. Consider the MMBF4091 for surface-mount implementations requiring SOT-23 packaging instead of through-hole TO-92. Verify thermal constraints given the 625 mW dissipation limit.
Part Context
This component belongs to the PN4091/4092/4093 family of N-channel JFETs. It is sourced from Process 51 technology. The device shares pinout compatibility with the MMBF4091 series, which offers the same electrical characteristics in a compact SOT-23 surface-mount package. Source and drain terminals are interchangeable in this configuration.
Replacement Considerations
Public confirmed substitute part numbers: MMBF4091 (SOT-23 equivalent), PN4092 (lower IDSS/rDS(on)), PN4093 (lowest IDSS/rDS(on)).
FAQ
Are the source and drain terminals interchangeable?
Yes, the datasheet explicitly notes that the source and drain terminals are interchangeable.
What is the maximum operating junction temperature?
The maximum operating and storage junction temperature range is -55 to +150 °C.
How does the PN4091 differ from the PN4092?
The PN4091 has a higher Zero-Gate Voltage Drain Current (30-40 mA vs 15 mA) and lower Drain-Source On Resistance (30 Ω vs 50 Ω) compared to the PN4092.
