This post explains for the amplifier.
The Part Number is BFW11.
The function of this semiconductor is VHF/UHF Amplifier(N-Channel/ Depletion).
The package is TO-72 ( TO-206A ) Type
Manufacturer: Motorola Inc
Preview images :
Description
The BFW11 is VHF/UHF Amplifier.
An N-channel silicon planar epitaxial junction field-effect transistor (JFET) is a specific type of JFET that utilizes N-type silicon material and planar epitaxial fabrication techniques. It is a three-terminal semiconductor device primarily used for low-power amplification and switching applications.
Key features:
1. N-Channel JFET: The transistor employs an N-type channel between the source and drain terminals. It is controlled by a voltage applied to the gate terminal to modulate the current flow through the channel.
2. Silicon Planar Epitaxial Construction: The JFET is constructed using silicon material and planar epitaxial fabrication techniques. Epitaxy refers to the process of growing a thin, single-crystal layer of semiconductor material on top of a substrate, resulting in improved performance characteristics.
3. Voltage-Controlled Device: The N-channel JFET is voltage-controlled, meaning the gate voltage determines the current flow through the channel. Applying a negative voltage to the gate relative to the source reduces the channel conductivity, limiting the current flow.
4. Low Input Impedance: JFETs generally exhibit low input impedance, which means they can present a high load to the signal source. This characteristic can be advantageous in certain applications where the input source has a high output impedance.
Applications:
1. JFET, VHF/UHF Amplifier […]
Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source Voltage: VDSS = 30 V
2. Gate to source Voltage: VGSS = ± 30 V
3. Drain Power Dissipation: Pd = 300 mW
4. Channel temperature: Tch = 150 °C
5. Storage temperature: Tstg = -65 to +150 °C
A VHF/UHF amplifier is an electronic device used to amplify signals in the very high frequency (VHF) and ultra-high frequency (UHF) ranges of the electromagnetic spectrum. VHF covers the frequency range from 30 MHz to 300 MHz, while UHF spans from 300 MHz to 3 GHz.