This part is a kind of semiconductor called LKS1aF-18V.

Function of this product has 250 mW Slim Power Relay.

Manufacturers : NAiS

Image and pinout :

Some of the text within the PDF file :

250 mW Slim Power Relay VDE LK-S LK-S RELAYS FEATURES 24.0 .945 11.0 .433 1. High sensitivity: 250mW The power-saving relay is highly sensitive 3. High noise immunity realized by the card separation structure between 25.0 at the nominal operating power of 250 contact and coil .984 mW (530 mW power consumption on LK 4. Popular terminal pitch in AV equip- relays). ment field mm inch 2. High insulation resistance between contact and coil 1) Creepage distance and clearances between contact and coil: Min. 6 mm .236 inch (In compliance with IEC65) 2) Surge withstand voltage between contact and coil: 10,000 V or more 5. Space-saving slim type Base area: Width 11 × Length 24 mm Width .433 × Length .945 inch 6. Conforms to the various safety standards UL/CSA, VDE, TÜV and SEMKO S [ ... ]

LKS1aF-18V PDF Datasheet Download