This part is a kind of semiconductor called BD677.

Function of this product has Plastic Medium-Power Silicon NPN Darlingtons.

Manufacturers : Motorola Inc

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Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BD675/D Plastic Medium-Power Silicon NPN Darlingtons . . . for use as output devices in complementary general–purpose amplifier applications. • High DC Current Gain hFE = 750 (Min) @ IC = 1.5 and 2.0 Adc • Monolithic Construction • BD675, 675A, 677, 677A, 679, 679A, 681 are complementary with BD676, 676A, 678, 678A, 680, 680A, 682 • BD 677, 677A, 679, 679A are equivalent to MJE 800, 801, 802, 803 MAXIMUM RATINGS Rating ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎ ÎÎÎÎÎÎÎÎ [ ... ]

BD677 PDF Datasheet Download