BLF974PU

Overview

The BLF974PU is a 500 W LDMOS power transistor designed for broadcast and industrial applications in the HF to 700 MHz band. It features a balanced ceramic SOT539A package with two mounting holes and four leads. Key electrical parameters include a drain-source voltage of 108 V, a junction temperature rating up to 225 °C, and a thermal resistance from junction to case of 0.161 K/W at Tcase = 90 °C. At 225 MHz with VDS = 50 V, it delivers 500 W output power with a typical gain of 25.7 dB and drain efficiency of 76% under pulsed conditions.

Feature Summary

• Designed for broadband operation across the 10 MHz to 700 MHz frequency range.
• Integrated electrostatic discharge (ESD) protection for enhanced device reliability.
• Excellent ruggedness capable of withstanding high load mismatch conditions.
• High efficiency and excellent thermal stability for demanding power applications.

Applications

• Industrial, scientific, and medical (ISM) applications
• Broadcast transmitter applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to ensure correct packaging and handling specifications. Confirm RoHS compliance status directly through official Ampleon channels prior to procurement. Ensure that ESD handling precautions are strictly followed during storage and assembly to maintain component integrity.

Selection Notes

Select this component for designs requiring high power output in the HF/VHF spectrum. Evaluate thermal management requirements based on the specified junction-to-case thermal resistance. Consider the balanced architecture when designing matching networks for push-pull configurations to optimize impedance matching and performance.

Part Context

The BLF974P belongs to Ampleon's portfolio of HF/VHF power LDMOS transistors. It utilizes a flanged balanced ceramic package (SOT539A) suitable for robust mounting. The device is manufactured by Ampleon Netherlands B.V., a global leader in RF power solutions derived from NXP Semiconductors' heritage.

Replacement Considerations

Consult the official Ampleon replacement guide for verified substitute part numbers. Do not assume functional equivalence with other models without verifying pinout, thermal characteristics, and electrical limits against the current datasheet.

FAQ

What is the maximum load mismatch the BLF974P can withstand?

The device can withstand a load mismatch corresponding to a Voltage Standing Wave Ratio (VSWR) of 40:1 through all phases under specified Class-AB operating conditions.

What is the ESD sensitivity classification for this component?

The BLF974P has a Charged Device Model (CDM) classification of C2A and a Human Body Model (HBM) classification of 2.

What package type does the BLF974P use?

It uses a flanged balanced ceramic package designated as SOT539A, which includes two mounting holes and four leads.