The RA07M3843M is a 7-watt RF MOSFET Amplifier Module for 7.2-volt portable radios that operate in the 378- to 430-MHz range. The battery can be connected directly to the drain of the enhancement-mode MOSFET transistors. Without the gate voltage (VGG=0V), only a small leakage current flows into the drain and the RF input signal attenuates up to 60 dB. The output power and drain current increase as the gate voltage increases. With a gate voltage around 2.5V (minimum), output power and drain current increases substantially. The nominal output power becomes available at 3V (typical) and 3.5V (maximum). At VGG=3.5V, the typical gate current is 1 mA. This module is designed for non-linear FM modulation, but may also be used for linear modulation by setting the drain quiescent current with the gate voltage and controlling the output power with the input power.
The RA07M3843M is a 7‑watt RF MOSFET amplifier module designed for 7.2 V portable radios operating in the 378‑430 MHz band. It uses enhancement‑mode MOSFET transistors and can be driven directly from a battery, with output power controlled by gate voltage or input power.
The document provides maximum ratings, electrical characteristics, typical performance curves, mechanical dimensions, mounting recommendations, ESD sensitivity, and safety precautions. It also outlines RoHS compliance and ordering information.
| Frequency Range | 378‑430 MHz |
|---|---|
| Typical Output Power | 7 W (at Vop=7.2 V, Vac=3.5 V, Pin=50 mW) |
| Total Efficiency | 40 % |
| Gate Voltage | 4 V (typical 3‑3.5 V for nominal power) |
| Drain Voltage | 12 V (max 12 V) |
| Total Current | 3.5 A |
| Input Power | 70 mW (max 70 mW) |
| Module Size | 30 × 10 × 5.4 mm |
| Package Code | H46S |
| Low‑Power Control Current | 1 mA at Veg=3.5 V |
The module is sensitive to ESD voltages down to 1000 V and requires appropriate ESD precautions.
M2.6 screws should be tightened to a torque of 1.8 to 3.0 kgf‑cm.
RoHS compliance is indicated by the letter “G” after the lot marking.