Surface mounting infrared sensors
14 November 2007
Opto-Electronics
Said to be the world's first SMD PIR, the IRS-A200ST01-R1 series from Murata provides benefits over and above the obvious for changing to SMD format. The obvious benefits are an immediate reduction of production costs from machine mounting PIRs with all the other SMDs, greater positional accuracy, height reduction of 60% and volume of 30%, no wires and no handling at soldering. The less obvious advantage is a side-effect of the fact that machine placement and reflow soldering provide precise positioning: with wires, the position of the actual sensor with respect to a target will vary depending on how the wires are positioned, and it is difficult to ensure lateral or vertical accuracy; the high accuracy positioning now possible enhances the accuracy with which the optical field itself is positioned, thus allowing higher specification of field and function. This is further aided by the availability of three special surface-mounting compact lenses that eliminate the need for troublesome optical design. The PIRs measure just 6,7 x 5,7 x 2,6 mm.
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