C4H18W500AY

Overview

The C4H18W500AY is a dual N-channel RF LDMOS transistor manufactured by Ampleon USA Inc. Designed for high-power applications, this component operates within the VHF frequency range of 136 MHz to 174 MHz. It delivers a typical output power of 500 W at a drain voltage of 50 V and a gain of 21 dB. The device utilizes an SOT-539B package, which facilitates efficient thermal management through its exposed metal pad. This transistor is engineered to provide robust performance in demanding radio frequency environments requiring high linearity and efficiency.

Feature Summary

• Dual N-channel configuration for balanced power amplification
• High output power capability suitable for broadcast transmission
• Optimized for operation in the VHF band with stable gain characteristics

Applications

• VHF FM broadcasting transmitters
• High-power amateur radio equipment
• Industrial RF heating systems

Procurement Notes

Verify the specific suffix and tape-and-reel quantity against the manufacturer's latest datasheet before ordering. Confirm that the SOT-539B package dimensions match your PCB footprint requirements. Ensure compatibility with the intended biasing network for the specified 50 V operating voltage. Check for any recent product change notifications regarding material composition or manufacturing site changes.

Selection Notes

Select this component when designing circuits requiring 500 W output power in the 136-174 MHz range. Consider the thermal resistance of the SOT-539B package and ensure adequate heatsinking is provided. Verify that the driver stage can supply sufficient drive power to achieve the specified 21 dB gain. Evaluate the system's requirement for dual-channel integration versus discrete single-transistor solutions.

Part Context

This part belongs to Ampleon's C4H series of RF LDMOS transistors, which are widely used in professional broadcasting and industrial applications. The series is known for its reliability and high power density. The C4H18W500AY specifically targets the VHF spectrum, complementing other models in the lineup designed for UHF and higher frequency bands. It represents a standard solution for high-power linear amplification needs.

Replacement Considerations

Direct replacements may include other Ampleon models with similar power and frequency ratings, such as the BLF888BS, though pinouts and thermal characteristics must be verified. Cross-brand equivalents require careful evaluation of gain, linearity, and package compatibility. Always consult the manufacturer's substitution guide for approved alternatives.