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Product Detailed Parameters
- Description：RF MOSFET
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：30 V
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：1 mA @ 15 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：500 mV @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：-
- Resistance - RDS(On)：-
- Power - Max：225 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The MMBFJ305 is an N-Channel Junction Field-Effect Transistor (JFET) designed primarily for electronic switching applications, including low on-resistance analog switching. Manufactured by Fairchild Semiconductor and now part of ON Semiconductor, this device utilizes process 50 technology. It is housed in a surface-mount SOT-23 package with three terminals: Drain, Source, and Gate. The component operates within a junction temperature range of -55°C to +150°C and features a total device dissipation of 225 mW at 25°C ambient temperature.
Feature Summary
- Designed specifically for electronic switching applications requiring low on-resistance analog switching capabilities.
- Manufactured using process 50 technology to ensure consistent performance characteristics.
- Features interchangeable drain and source terminals for flexible circuit layout integration.
Applications
- Low on-resistance analog switching circuits
- Electronic switching applications
Procurement Notes
Verify the current ordering designation before procurement, as Fairchild part numbers containing underscores have been converted to dashes to align with ON Semiconductor system requirements. Confirm availability status directly through authorized distributors or the manufacturer's website, as product lifecycle stages may affect supply continuity. Ensure compliance with RoHS directives and check for any specific environmental certifications required for your application.
Selection Notes
Select the MMBFJ305 when designing circuits that require N-channel JFETs for analog switching with low on-resistance characteristics. Consider the SOT-23 package constraints for thermal management, noting the junction-to-ambient thermal resistance of 556 °C/W. Validate gate-source breakdown voltage and zero-gate voltage drain current parameters against your specific circuit requirements to ensure operation within absolute maximum ratings.
Part Context
This component belongs to the family of N-Channel RF Amplifiers and JFETs produced by Fairchild Semiconductor. Following the corporate integration into ON Semiconductor, legacy Fairchild branding has been transitioned. The MMBFJ305 shares functional similarities with other small-signal JFETs but is distinctively characterized by its specific process technology and packaging configuration suitable for surface-mount applications.
Replacement Considerations
Check the ON Semiconductor website for updated part numbers due to the underscore-to-dash naming convention change. No direct equivalent substitute part numbers are documented in the provided datasheet.
