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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)：15 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：2 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：16pF @ 20V
- Resistance - RDS(On)：50 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 U1898 is an N-channel JFET switch in a TO-92 package. It features a drain-source on resistance of 50 ohms at 1 mA and a zero-gate voltage drain current of 15 mA at 20 V. The device supports a gate-source breakdown voltage of -40 V and operates within a junction temperature range of -55°C to 150°C. Total power dissipation is rated at 625 mW, with thermal resistances of 125°C/W (junction-to-case) and 357°C/W (junction-to-ambient). Input capacitance is 16 pF.
Feature Summary
- Designed for low-level analog switching applications
- Suitable for sample-and-hold circuits
- Compatible with chopper-stabilized amplifier designs
Applications
- Low level analog switching
- Sample and hold circuits
- Chopper stabilized amplifiers
Procurement Notes
Verify the component status as obsolete or discontinued when sourcing from distributors. Confirm that the datasheet revision matches the required specifications, noting potential updates from Fairchild Semiconductor or onsemi. Ensure the TO-92 package variant aligns with board layout constraints. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.
Selection Notes
Select this component for circuits requiring precise analog signal routing with minimal distortion. The specific on-resistance and cutoff characteristics define its suitability for precision instrumentation. Compare performance against alternatives like the J111 if different electrical parameters are needed. Evaluate thermal management requirements based on the specified power dissipation limits in the target environment.
Part Context
This part belongs to the family of N-channel JFET switches originally manufactured by Fairchild Semiconductor. The manufacturer notes that it is sourced from Process 51. The datasheet explicitly references the J111 device for comparative characteristics, indicating a shared design lineage or functional similarity within the manufacturer's discrete semiconductor portfolio.
Replacement Considerations
Consult the datasheet for the J111 as a reference for comparable characteristics. Verify availability of direct substitutes through official manufacturer channels due to the product's obsolete status.
FAQ
What is the maximum gate-source voltage rating?
The absolute maximum rating for Gate-Source Voltage (VGS) is -40 V.
How does the U1898 compare to other devices?
The datasheet directs users to see the J111 for similar characteristics.
What is the input capacitance value?
The input capacitance (Ciss) is 16 pF at VDS = 20 V and f = 1.0 MHz.
