This part is a kind of semiconductor called AQY211EHA.

Function of this product has High cost-performance DIP4-pin type.

Manufacturers : Panasonic

Image and pinout :

Some of the text within the PDF file :

GU-E 1 Form A (AQY21EH) High cost-performance DIP4-pin type with reinforced insulation AQY21EH GU-E 1 Form A (AQY21EH) FEATURES 4.78 .188 6.4 .252 3.2 .126 4.78 .188 6.4 .252 2.9 .114 TYPICAL APPLICATIONS • Modem • Telephone equipment • Security equipment • Sensing equipment CAD Data CAD Data mm inch 1 4 2 3 1. Reinforced insulation of 5,000 V More than 0.4 mm internal insulation distance between inputs and outputs. Con-forms to EN41003, EN60950 (reinforced insulation). 2. Controls low-level analog signals PhotoMOS relays feature extremely low closed-circuit offset voltage to enable control of low-level analog signals without distortion. 3. High sensitivity and low onresistance Can control max. 0.13 A load current with 5 mA input current. Low on-resistance of typ. [ ... ]

AQY211EHA PDF Datasheet Download