Overview
The BF998,235 is a dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) produced by NXP USA Inc. It is designed for high-frequency amplification and mixing applications, particularly in RF (radio frequency) circuits. The transistor features two separate gate terminals, allowing for independent control of the device's input and output impedance, which is beneficial for applications requiring high gain and low noise performance. The BF998 is available in plastic microminiature SOT143B or SOT143R packages with the source and substrate interconnected, and it includes integrated back-to-back diodes between gates and source for protection against excessive input voltage surges.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Product Category | Transistors - FETs, MOSFETs - RF |
| Transistor Type | N-Channel Dual Gate |
| Voltage - Rated | 12 V |
| Voltage - Test | 8 V |
| Current - Test | 10 mA |
| Current Rating (Amps) | 30 mA |
| Frequency | 200 MHz |
| Noise Figure | 0.6 dB |
| Package / Case | SOT-143B, SOT-143R |
| Product Status | Obsolete |
Key Features
- Short channel transistor with high forward transfer admittance to input capacitance ratio.
- Low noise gain controlled amplifier up to 1 GHz.
- Dual-gate design allowing for independent control of input and output impedance.
- Integrated back-to-back diodes between gates and source for protection against excessive input voltage surges.
- Available in SOT143B or SOT143R packages.
Applications
- VHF and UHF applications with 12 V supply voltage, such as television tuners and professional communications equipment.
- Radio frequency and communication circuits.
- Low-noise amplifiers and radio receivers.
Q & A
- What is the BF998,235 used for? The BF998,235 is used for high-frequency amplification and mixing applications, particularly in RF circuits.
- What type of transistor is the BF998,235? It is an N-Channel Dual Gate MOSFET.
- What is the rated voltage of the BF998,235? The rated voltage is 12 V.
- What is the maximum current rating of the BF998,235? The maximum current rating is 30 mA.
- What is the frequency range of the BF998,235? It operates up to 200 MHz.
- What is the noise figure of the BF998,235? The noise figure is 0.6 dB.
- In what packages is the BF998,235 available? It is available in SOT143B and SOT143R packages.
- Is the BF998,235 still in production? No, the BF998,235 is obsolete and no longer manufactured.
- What are some common applications of the BF998,235? Common applications include VHF and UHF circuits, television tuners, and professional communications equipment.
- What protection features does the BF998,235 have? It includes integrated back-to-back diodes between gates and source for protection against excessive input voltage surges.
