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HSMS-2820 Datasheet(PDF) 10 Page - AVAGO TECHNOLOGIES LIMITED |
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HSMS-2820 Datasheet(HTML) 10 Page - AVAGO TECHNOLOGIES LIMITED |
10 / 15 page 10 Diode Burnout Any Schottky junction, be it an RF diode or the gate of a MESFET, is relatively delicate and can be burned out with excessive RF power. Many crystal video receivers used in RFID (tag) applications find themselves in poorly con‑ trolled environments where high power sources may be present. Examples are the areas around airport and FAA radars, nearby ham radio operators, the vicinity of a broadcast band transmitter, etc. In such environments, the Schottky diodes of the receiver can be protected by a device known as a limiter diode.[5] Formerly available only in radar warning receivers and other high cost electronic warfare applications, these diodes have been adapted to commercial and consumer circuits. Avago offers a complete line of surface mountable PIN limiter diodes. Most notably, our HSMP‑4820 (SOT‑23) can act as a very fast (nanosecond) power‑sensitive switch when placed between the antenna and the Schottky di‑ ode, shorting out the RF circuit temporarily and reflecting the excessive RF energy back out the antenna. Assembly Instructions SOT-3x3 PCB Footprint Recommended PCB pad layouts for the miniature SOT‑ 3x3 (SC‑70) packages are shown in Figures 26 and 27 (di‑ mensions are in inches). These layouts provide ample al‑ lowance for package placement by automated assembly equipment without adding parasitics that could impair the performance. Figure26. RecommendedPCBPadLayoutforAvago’s SC70 3L/SOT-323 Products. Figure27. Recommended PCB Pad Layout for Avago's SC70 6L/SOT-363 Products. 0.026 0.039 0.079 0.022 Dimensions in inches 0.026 0.079 0.018 0.039 Dimensions in inches |
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