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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 U1897 is a small signal field-effect transistor manufactured by Fairchild Semiconductor, now part of onsemi. It is a single-element, N-channel silicon junction FET housed in a TO-92 package with three pins. The device operates in depletion mode and features a maximum drain-source on-resistance of 30 Ω and a maximum feedback capacitance (Crss) of 3.5 pF. It supports a maximum operating temperature of 150 °C and is constructed with a plastic/epoxy body.
Feature Summary
- Single-element N-channel silicon junction FET configuration
- Depletion mode operation capability
- Compact TO-92 cylindrical plastic/epoxy packaging
Applications
- Small signal switching applications
- Low-power electronic circuits requiring depletion mode devices
- General-purpose discrete semiconductor components
Procurement Notes
Verify the current ordering nomenclature on the official onsemi website, as legacy Fairchild part numbers may have been updated to remove underscores. Confirm RoHS compliance status through official datasheets or material composition documents before procurement. Ensure the specific TO-92 variant matches the required pinout and thermal specifications for the target application design.
Selection Notes
Select this component for designs requiring a small-signal N-channel JFET in a standard TO-92 package. Consider the 30 Ω on-resistance and 3.5 pF feedback capacitance when evaluating signal integrity requirements. Verify that the 150 °C maximum operating temperature aligns with the environmental conditions of the intended system deployment.
Part Context
This component originates from Fairchild Semiconductor's portfolio prior to its integration into onsemi. It represents a legacy small-signal discrete transistor offering. The device is categorized under general-purpose transistors and remains relevant for maintaining existing designs or sourcing standard depletion-mode JFETs in through-hole compatible packages.
Replacement Considerations
Consult official cross-reference guides for equivalent N-channel JFETs in TO-92 packages. Verify pin compatibility and electrical parameters such as Rds(on) and Crss before substituting with alternative manufacturers' parts.
