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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Poning[/i] [br]To supply 5V to a PIC in a 12-15V automotive environment, I have so far been using variants of 7805s, or the HV varieties of PIC. While they work, obviously they aren't really of sufficient protection for the environment. In particular reversed polarities, and battery 'jump starts' can cause problems of the destructive variety. My circuits draw very little current (100mA is a typical maximum) and I solder through hole by hand, so I would avoid SMD. Can anybody recommend either a good way to protect a simple 7805 (or 78L05), or some alternatives to the 7805 that are more suitable for the environment? I have so far found a suggestion of [b]LM2937[/b](datasheet:[url]http://www.kynix.com/uploadfiles/pdf2286/LM2937ES-12.pdf[/url]), but this is relatively very expensive (some 10x more than a 7805) As a side question, is there a good way to find automotive grade components? I usually use farnell's catalogue, but they don't seem to have 'automotive' in their parametric search so it is a matter of scouring datasheets, which is time consuming. [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.