Hi Ravinder, X5R is a good choice for decoupling purpose as it has high dielectric constant and temperature stability. Regarding voltage rating, the rule of thumb is >150% of Operating voltage. As far as your application is considered 10V will be an appropriate choice. Thanks Vikas -----Original Message----- From: Ravinder Ajmani [mailto:ajmani@xxxxxxxxxx] Sent: Thursday, June 14, 2001 6:12 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Voltage rating of a Ceramic capacitor I have been asked to replace Tantalum bulk capacitor in a design with a suitable Ceramic capacitor. The Ceramic capacitor is X5R type, which I believe is more stable than Y5V. However, its voltage rating being 6.3V, I am not feeling very comfortable to use it in the 5V application. Can anyone advise me about the minimum voltage rating I should have for a bulk Ceramic capacitor in a 5V application. Regards, Ravinder PCB Development and Design Department IBM Corporation Email: ajmani@xxxxxxxxxx ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list Old list archives are viewable at: http://www.qsl.net/wb6tpu