We can supply U21, use the request quote form to request U21 pirce and lead time.XXX.com a professional electronic components distributor. With 3+ Million line items of available electronic components can ship in short lead-time, over 250 thousand part numbers of electronic components in stock for immediately delivery, which may include part number U21.The price and lead time for U21 depending on the quantity required, availability and warehouse location.Contact us today and our sales representative will provide you price and delivery on Part# U21.We look forward to working with you to establish long-term relations of cooperation