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Product Detailed Parameters
- Description：RF TRANS NPN 20V TO-92-3
- Series：-
- Mfr：onsemi
- Package：Bulk
- Transistor Type：NPN
- Voltage - Collector Emitter Breakdown (Max)：20V
- Frequency - Transition：-
- Noise Figure (dB Typ @ f)：-
- Gain：-
- Power - Max：350mW
- DC Current Gain (hFE) (Min) @ Ic, Vce：67 @ 1mA, 10V
- Current - Collector (Ic) (Max)：30mA
- Operating Temperature：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 BF494 is an NPN silicon RF small signal transistor manufactured by Fairchild Semiconductor, now part of onsemi. It is housed in a TO-92 plastic package with three leads. The device features a collector-emitter voltage (VCEO) of 20 V and a collector-base voltage (VCBO) of 30 V. Maximum continuous collector current is rated at 30 mA. DC current gain (hFE) ranges from 67 to 222 under specified test conditions. Total power dissipation is 350 mW at 25°C ambient temperature, with a thermal resistance junction-to-ambient of 357 °C/W. The maximum operating junction temperature is 150 °C.
Feature Summary
- Designed for RF applications as a small signal transistor
- Utilizes planar epitaxial silicon construction
- Provides high breakdown voltage capability relative to its size
Applications
- RF amplifier circuits
- High frequency signal processing
- General purpose switching applications
Procurement Notes
Verify the manufacturer origin carefully, as Fairchild Semiconductor was acquired by onsemi. Confirm that the specific batch or revision matches the required datasheet version (Rev. A). Ensure the component is sourced from authorized distributors to avoid counterfeit parts, particularly given the legacy status of some production runs.
Selection Notes
Select this component when an NPN transistor with low noise characteristics and moderate voltage ratings is required for RF stages. Compare hFE limits against circuit requirements. Consider the TO-92 package constraints for thermal management if operating near maximum power dissipation limits.
Part Context
This component belongs to the family of NPN RF transistors produced by Fairchild Semiconductor. It shares functional similarities with other small-signal RF devices like the MPS5179 but is distinct in its specific voltage and gain parameters defined in the official datasheet.
Replacement Considerations
The MPS5179 is listed as a similar specification part number in public documentation. Verify pinout compatibility and electrical parameter overlap before substitution.
