BLF1043,135

Overview

The BLF1043 is a 10 W LDMOS power transistor designed for base station applications across the HF to 1000 MHz frequency range. It operates with a drain-source voltage of 26 V and a quiescent current of 85 mA, delivering 10 W PEP output power with 18.5 dB gain and 40% efficiency in two-tone class-AB operation at 960 MHz. The device features a ceramic surface-mounted SOT538A package with two leads. Key electrical limits include a maximum drain-source voltage of 65 V, gate-source voltage of ±15 V, and DC drain current of 2.2 A. Thermal resistance from junction to heatsink is typically 9 K/W.

Feature Summary

• Designed for broadband operation without internal matching components
• Capable of withstanding high load mismatch conditions up to VSWR 10:1
• Features excellent thermal stability and ruggedness in class-AB operation

Applications

• RF power amplifiers for GSM, EDGE, and CDMA base stations
• Multicarrier applications in the 800 to 1000 MHz frequency range
• Broadcast drivers

Procurement Notes

Verify the specific ordering suffix against official Ampleon documentation to confirm package version and compliance status. Ensure ESD precautions are strictly followed during handling due to component sensitivity. Confirm that the intended application environment remains within the specified absolute maximum ratings for voltage, current, and temperature to prevent permanent damage.

Selection Notes

Select this component for designs requiring a 10 W output capability in the UHF band with a 26 V supply rail. The SOT538A ceramic package requires appropriate PCB layout considerations for thermal management and RF grounding. Verify that the system impedance matching network aligns with the typical input and output impedances provided in the datasheet graphs for optimal performance.

Part Context

The BLF1043 belongs to the Ampleon UHF power LDMOS transistor family. It serves as a solid-state solution for replacing older vacuum tube technologies in broadcast and telecommunications infrastructure. The device represents a mature technology optimized for cost-effective, high-efficiency power amplification in multi-standard base station architectures.

Replacement Considerations

Consult official Ampleon substitution guides for verified equivalents. Cross-referencing pinouts and thermal characteristics is essential when considering alternative manufacturers.