This part is a kind of semiconductor called 61055-006.

Function of this product has SILICON PHOTOTRANSISTOR PILL PACK.

Manufacturers : Micropac Industries

Image and pinout :

Some of the text within the PDF file :

61055 SILICON PHOTOTRANSISTOR “PILL PACK” (TYPE GS1020) 02/22/01 Mii OPTOELECTRONIC PRODUCTS DIVISION REVISION B Features: • • • • • Hermetically sealed High sensitivity Small package Suitable for high-density pc board mounting Spectrally matched to the 62000 Series LED. Applications: • • • • Incremental Encoding Reflective Sensors Position Sensors Level Sensors DESCRIPTION The 61055 is an N-P-N Planar Silicon Transistor in a package designed to be mounted in a double-clad printed circuit board. It is available in a range of sensitivities and is lensed for minimum response to stray light. High sensitivity, low dark current leakage, and low saturation voltage make this device ideal for interfacing with TTL circuits. Available custom binned to customer specificati [ ... ]

61055-006 PDF Datasheet Download