This part is a kind of semiconductor called ULN2804AF.

Function of this product has 8 HIGH-VOLTAGE HIGH-CURRENT DARLINGTON TRANSISTOR ARRAYS.

Manufacturers : First Silicon

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA 8 HIGH-VOLTAGE HIGH-CURRENT DARLINGTON TRANSISTOR ARRAYS The ULN2803/4 are high-voltage, high-current darlington drivers comprised of eight NPN darlington pairs. All units feature integral clamp diodes for switching inductive loads. Applications include relay, hammer, lamp and display(LED) drivers. FEATURES Output Current (Single Output) : 500mA Max. High Sustaining Voltage Outputs : 50V Min. Output Clamp Diodes Inputs Compatible With Various Types of Logic. PKG Type, P : DIP-18 PKG Type, F : SOP-18 TYPE ULN2803 ULN2804 INPUT BASE RESISTOR 2.7kΩ 10.5kΩ DESIGNATION TTL, 5V C-MOS 6 ~ 15V P-MOS, C-MOS ULN2803AP/AF ULN2804AP/AF W C LG dD P TQ DIM MILLIMETERS A A 25 1MAX B 6 40+_ 0 2 18 10 C 3 50+_ 0 2 D 1 40 +_0 1 B d 0 50+_ 0 1 G 4 15+_ 0 3 1 [ ... ]

ULN2804AF PDF Datasheet Download