Special chip capacitors
1 August 2001
Passive Components
Murata is so well known for its run-of-the-mill general-purpose ceramic chip capacitors that extensive ranges of more special types tend to be overlooked.
The GHM series is for high voltage, high value, 250 V a.c. or X/Y applications to the safety standards of UL, BSI, VDE, SEMKO and IEC.
Voltage ratings up to 2 kV d.c. with a low dissipation factor for snubber circuits, ballast and the like are offered in chip sizes down to 1206. The low loss dielectric and construction give good high frequency performance. This is the GHM1000 series, which can be flow or reflow soldered without silver loaded solder.
Capacitance values up to 220 nF rated at 630 V d.c. in a 2220 format are suitable for line filter and ringer detection, hot-cold coupling of DC-DC converters and diode snubbing in switching power supplies. The GHM1500 family has five sizes, of which the 0805 and 1206 may be flow or reflow soldered.
The 250 V a.c. (RMS) rated GHM2000 has values up to 100 nF. They are sized 2220 or 2211. The terminations are the same as on the previous types but, at this size, reflow soldering is recommended.
Safety standard recognised monolithic ceramic chip capacitors are relatively new, and Murata says it is the first to have X1, X2 and Y2 types recognised. The dielectric is X7R with values up to 33 nF and a 10% tolerance. Again only reflow soldering is recommended.
Avnet Kopp
(011) 444 2333
[email protected]
www.avnet.co.za
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