|

楼主 |
发表于 2012-6-14 21:56:08
|
显示全部楼层
回 youngliu 的帖子
youngliu:e4标识代表PBF(Pb free) RoHS compliance package,所谓的无铅产品,若有不对请指教。 (2012-06-14 21:11)  没错,但是你解释的太肤浅了,让我来告诉你
e1表示SnAgCu;e2表示不含铋或锌的锡合金,不包括SnAgCu;e3表示锡;e4表示进行了预镀(如Ag、Au、NiPd、NiPdAu);e5表示SnZn,SnZnx(不含铋);e6表示含铋;e7表示使用温度小于150℃的低温焊料,含铟但不含铋。 LTZ1000的e4正是镀金脚!
关于 “2005年的LTZ1000CH是不镀金的脚,2011年的LTZ1000CH则又是镀金的脚” 我给你贴出凌力尔特的官方解释:
JEDEC Standard JESD97 defines various Lead (Pb) Free categories with symbols e1 through e7. The symbol e3 applies to products with a Matte Tin (Sn) terminal finish. Since LTC Lead (Pb) Free products have a Matte Tin (Sn) terminal finish, the symbol e3 is added to the product top marking of larger packages, where space permits. On packages that are too small to accommodate the e3, a “<” symbol is added to the device at the pin 1 location. Lead (Pb) free 2mm X 2mm and 3mm X 2mm packages are identified by rearranging the trace code marking of the device. These Lead (Pb) Free marking indicators were implemented starting with date code 0514. However, we will continue to ship Lead-Free product, from our existing stock, which was marked prior to 0514 without the indicator.
出自:http://www.linear.com/designtools/leadfree/
英文好的自己翻译,以上大概的意思是:无铅的产品会在外壳上标上e1/e2/e3/e4....的标识,这条规则从05年14周开始生效。也就是说0514之前的含铅还是无铅都没有那个标识,从0514之后无铅的会标上那个标识。
现在一切都解释清了吧,我也不想就这个问题再讨论了 |
|