BLF981SU

Overview

The BLF981SU is an N-Channel LDMOS RF power transistor manufactured by Ampleon USA Inc. It delivers a typical output power of 170 W with a gain of 24 dB across a frequency range up to 1.4 GHz. The device features a drain-source breakdown voltage (Vds) of 108 V and operates within a maximum junction temperature of +225 °C. Designed for broadband applications, it utilizes the SOT-467B-2 package for surface mount installation. Key electrical specifications include a gate-source voltage range of -6 V to +11 V and a threshold voltage of 2.5 V.

Feature Summary

• Integrated dual-sided ESD protection for enhanced robustness
• Optimized for high-efficiency broadband operation from HF to 1400 MHz
• Suitable for both analog and digital signal transmission

Applications

• Broadcast transmitters including DVB-T and FM/AM systems
• Avionics communication equipment operating at frequencies up to 1400 MHz
• Industrial, Scientific, and Medical (ISM) applications
• Non-cellular communication systems

Procurement Notes

Verify the specific suffix 'SU' against the manufacturer's current datasheet to confirm the exact package variant and tape-and-reel or tray packaging configuration. Ensure that the ordering information matches the required RoHS compliance status and lead time requirements specified by the authorized distributor. Cross-reference the part number with official Ampleon documentation to avoid substitution errors.

Selection Notes

Select this component for designs requiring 170 W output power in a compact SMD form factor. Verify thermal management capabilities given the 0.50 K/W junction-to-case thermal resistance. Confirm that the system can support the required 108 V drain voltage and that the bias circuitry accommodates the specified gate voltage limits for stable linear or switching operation.

Part Context

The BLF981SU belongs to the BLF981 family of LDMOS power transistors designed for high-efficiency broadband applications. While the standard BLF981 uses the SOT467C package, the BLF981SU variant utilizes the SOT467B package. Both devices share similar electrical characteristics but differ in physical footprint and mounting style, requiring careful PCB layout consideration during integration.

Replacement Considerations

The BLF981U is a related variant using the SOT467C package. Verify pinout compatibility and thermal interface differences before substituting. No other direct cross-model replacements are confirmed in public documentation.