HSMS-286C datasheet(13/18 Pages) AVAGO

13 / 18 page

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

controlled 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.[6] 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)

or HSMP‑482B (SOT‑323) can act as a very fast (nano‑

second) power‑sensitive switch when placed between

the antenna and the Schottky diode, shorting out the

RF circuit temporarily and reflecting the excessive RF

energy back out the antenna.

Figure 34. Recommended PCB Pad Layout for Avago’s SC70 6L/SOT-363

Products.

[6] Avago Application Note 1050, Low Cost, Surface Mount Power Limiters.

0.026

0.039

0.079

0.022

Dimensions in inches

0.026

0.075

0.016

0.035

Figure 33. Recommended PCB Pad Layout for Avago’s SC70 3L/SOT-323

Products.

A recommended PCB pad layout for the miniature

SOT‑363 (SC‑70 6 lead) package is shown in Figure 34

(dimensions are in inches). This layout provides ample

allowance for package placement by automated

assemblyequipmentwithoutaddingparasiticsthatcould

impair the performance.

Assembly Instructions

SOT-323 PCB Footprint

A recommended PCB pad layout for the miniature SOT‑

323 (SC‑70) package is shown in Figure 33 (dimensions

are in inches).

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