BLF984PSU

Overview

The Ampleon BLF984PSU is a 450 W LDMOS RF power transistor designed for broadcast Doherty, class-AB transmitter, and industrial applications. It operates across a frequency range from 30 MHz to 860 MHz with excellent ruggedness suitable for digital and analog signals. The device features integrated double-sided ESD protection and high power gain. At 700 MHz in pulsed CW mode (VDS=50 V), it delivers 450 W peak output power with 22 dB gain and 67.5% drain efficiency. In class-AB DVB-T operation at 700 MHz, it provides 80 W average output power with 22.5 dB gain and 34% efficiency. The limiting drain-source voltage is 108 V, and the maximum junction temperature is 225 °C.

Feature Summary

• Designed for broadband and Doherty operation
• Integrated double-sided ESD protection
• Excellent ruggedness under load mismatch conditions
• High power gain and efficiency

Applications

• Broadcast transmitter applications in the UHF band
• Digital and analog broadcasting systems
• Industrial, scientific and medical (ISM) applications

Procurement Notes

Verify the specific ordering suffix against official Ampleon documentation to confirm package variant and handling specifications. Ensure compatibility with system thermal management requirements given the high power dissipation. Confirm RoHS compliance status via the manufacturer's product details page prior to final procurement authorization.

Selection Notes

Select this component for high-power UHF applications requiring robust performance in both analog and digital modulation schemes. Evaluate impedance matching networks using the provided push-pull impedance data for optimal power transfer. Consider the thermal resistance characteristics when designing heat sinks to maintain junction temperatures within safe operating limits during continuous or pulsed operation.

Part Context

The BLF984PS belongs to the Ampleon LDMOS power transistor family, specifically engineered for high-efficiency broadband applications. It complements other high-power devices in the portfolio by offering specialized ruggedness for demanding broadcast environments. The PS variant utilizes an earless flanged ceramic package (SOT1121B), distinguishing it from the standard flanged version.

Replacement Considerations

The BLF984P is the primary alternative within the same datasheet, differing only in package configuration (SOT1121A vs SOT1121B). Verify mechanical mounting constraints before substitution.