EVERLIGHT为光电元件：光耦Photo coupler 功能方面可分为5大类：达林顿型光耦、高速光耦、施密特触发型光耦、电晶体型光耦、可控硅型光耦；以PIN脚数来看，有4PIN、6PIN、8PIN的光耦，通过UL,VDE,CSA,BSI等安规认证，符合RoHS环保与无铅制程要求，月产量超过80KKpcs，分别有标准脚距、宽PIN距和SMT型可供选择，部分光耦有分CTR值的等级，与NEC,SHARP,LITE-ON,FAIRCHILD,COSMO等同行业的光耦可以PIN TO PIN的通用替代，用于各种家电、通讯、资讯等电源控制板，起到安全隔离与信号反馈等作用

4PIN光耦EL817命名/品名编码方式：
EL817X(Y)(Z)-FVG
说明：
EL是Everlight的简写标识
X = Lead form option (S, S1, S2, M or none)电极脚的规格，Sx表示贴片方式，M表示宽脚位0.4 "即10.0mm
Y = CTR Rank (A, B, C, D, X , Y or none)电流放大倍率，例如C表示CTR为200~400%
Z = Tape and reel option (TA, TB, TU, TD or none).包装方式，包装管或者贴片编带的具体方式
F = Lead frame option (F: Iron, None: copper)电极引脚的材质，F为特合金，不标注表示铜合金
V = VDE safety (optional).德国的VDE安规认证           
G = Halogens free符合卤素管制要求

Option Description Packing quantity
None Standard DIP-4 100 units per tube，常规的插件光耦EL817为100pcs/管，25管一小盒，12小盒一大箱
M Wide lead bend (0.4 inch spacing) 100 units per tube，带后缀M表示发射管与接收管的电极间距为10.0mm
S (TA) Surface mount lead form + TA tape & reel option 1000 units per reel电极符合贴片安装方式，TA编带规格
S (TB) Surface mount lead form + TB tape & reel option 1000 units per reel电极符合贴片安装方式，TB编带规格
S1 (TA) Surface mount lead form (low profile) + TA tape & reel option 1000 units per reel贴片，TA编带规格
S1 (TB) Surface mount lead form (low profile) + TB tape & reel option 1000 units per reel贴片，TB编带规格
S2 (TA) Surface mount lead form (Gull-wing) + TA tape & reel option 500 units per reel贴片，TA编带500pcs规格
S2 (TB) Surface mount lead form (Gull-wing) + TB tape & reel option 500 units per reel贴片，TA编带1000pcs规格
S (TU) Surface mount lead form + TU tape & reel option 1500 units per reel贴片，TU编带1500pcs规格
S (TD) Surface mount lead form + TD tape & reel option 1500 units per reel贴片，TD编带1500pcs规格
S1 (TU) Surface mount lead form (low profile) + TU tape & reel option 1500 units per reell贴片，TU编带1500pcs规格
S1 (TD) Surface mount lead form (low profile) + TD tape & reel option 1500 units per reell贴片，TD编带1500pcs规格