Hi,

If the quality of the datasheet reflects the quality of the product....
http://www.rapidonline.com/netalogue/specs/47-5512.pdf

Compare the above datasheet with the datasheet of the MPSA14 made by Philips Semiconductors.
http://www.nxp.com/acrobat_download/...s/MPSA14_7.pdf

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Make sure you know who are the makers of the components you use.

Best regards,

Luciano