BLL8H1214LS-250U

Overview

The BLL8H1214LS-250U is a 250 W LDMOS power transistor designed for L-band radar applications in the 1.2 GHz to 1.4 GHz range. It features integrated dual-side ESD protection, high efficiency, and excellent thermal stability. Typical RF performance at Tcase = 25 °C, tp = 300 µs, δ = 10%, IDq = 100 mA includes: VDS = 50 V, PL = 250 W, Gp = 17 dB, ηD = 55%, tr = 15 ns, tf = 5 ns. DC characteristics include V(BR)DSS = 100 V, IDSX = 42 A typ, gfs = 2.3 S typ, RDS(on) = 169 mΩ max. Thermal impedance Zth(j-c) is 0.15 K/W typ at tp = 300 µs, δ = 10%. Package is SOT502B.

Feature Summary

• Easy power control
• Integrated dual side ESD protection
• High flexibility with respect to pulse formats
• Excellent ruggedness
• High efficiency
• Excellent thermal stability
• Designed for broadband operation (1.2 GHz to 1.4 GHz)
• Internally matched for ease of use
• Compliant to Directive 2002/95/EC, regarding restriction of hazardous substances (RoHS)

Applications

• L-band power amplifiers for radar applications in the 1.2 GHz to 1.4 GHz frequency range

Procurement Notes

Verify the specific ordering suffix 'U' against the official Ampleon datasheet or sales office, as the provided documentation lists BLL8H1214LS-250 without this suffix. Confirm package type SOT502B matches requirements. Ensure ESD handling precautions per ANSI/ESD S20.20 are followed during procurement and storage.

Selection Notes

Select BLL8H1214LS-250U for class-AB pulsed radar amplifier designs requiring 250 W output power in the 1.2–1.4 GHz band. Verify load mismatch tolerance up to VSWR = 10:1 under specified conditions. Check thermal management needs based on Zth(j-c) values. Ensure gate-source voltage limits (-6 V to +13 V) are respected in bias circuit design.

Part Context

The BLL8H1214LS-250U belongs to the BLL8H1214L(S)-250 family of LDMOS power transistors from Ampleon. This series is specifically engineered for robust performance in L-band radar systems. The 'LS' variant denotes an earless flanged ceramic package (SOT502B), differing from the standard 'L' version which includes mounting holes (SOT502A).

Replacement Considerations

Direct replacement options within the same family include BLL8H1214L-250 (SOT502A package). Cross-family replacements like BLL8H0514L-130 operate at different frequencies and power levels and require circuit redesign. Verify pinout compatibility and thermal interface dimensions when substituting.