This part is a kind of semiconductor called AQV210.

Function of this product has (AQV210x - AQV217x) PhotoMOS Relays.

Manufacturers : Aromat

Image and pinout :

Some of the text within the PDF file :

(Standard type) TESTING VDE (Reinforced type) GU (General Use) Type [1-Channel (Form A) Type] PhotoMOS RELAYS 6. Stable on resistance 7. Low-level off state leakage current 8. Eliminates the need for a power supply to drive the power MOSFET A power supply used to drive the power MOSFET is unnecessary because of the built-in optoelectronic device. This results in easy circuit design and small PC board area. 9. Low thermal electromotive force (Approx. 1 µV) FEATURES 8.8±0.05 .346±.002 6.4±0.05 .252±.002 3.9±0.2 .154±.008 8.8±0.05 .346±.002 6.4±0.05 .252±.002 3.6±0.2 .142±.008 mm inch 1 2 3 6 5 4 1. Controls low-level analog signals PhotoMOS relays feature extremely low closed-circuit offset voltage to enable control of low-level analog signals without distortion. 2. Cont [ ... ]

AQV210 PDF Datasheet Download