Ken says: Russell, In addition to the ON Semi's MC78LCxx series (which have been around for at least 10 years): Seiko have for many years (20 ?) been making a range of CMOS low-current LD= O's with Iq's in the uA range. http://www.sii-ic.com/en/product1.jsp?subcatID=3D22&productID=3D453 http://www.sii-ic.com/en/product1.jsp?subcatID=3D22&productID=3D1236 http://www.sii-ic.com/en/product1.jsp?subcatID=3D22&productID=3D1841 and for high input voltage at a slightlyly higher Iq of 4uA: http://www.sii-ic.com/en/product1.jsp?subcatID=3D22&productID=3D50304 Rohm make a curious low-power LDO that "changes gears" and provides 2uA Iq: http://www.rohm.com/products/lsi/power/portable/sel5_sub1/ Microchip have their MCP1700 family: http://ww1.microchip.com/downloads/en/DeviceDoc/21826b.pdf TI should have something and I'm sure there will be others as well that I d= on't know about. Regards, Ken Mardle --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .