This part is a kind of semiconductor called ASTD-xxxx.

Function of this product has PLANAR TUNNEL (BACK) DIODE.

Manufacturers : Advanced Semiconductor

Image and pinout :

Some of the text within the PDF file :

ASTD SERIES PLANAR TUNNEL (BACK) DIODE DESCRIPTION: The ASTD Series of Tunnel Diodes are Optimized for Operation as Back Diode Detectors in Applications up to 18 GHz. PACKAGE STYLE 51 FEATURES INCLUDE: • Excellent Temperature Stability • Fast Rise / Fall Times • Available in Die Form MAXIMUM RATINGS IR PDISS PDISS TJ TSTG 10 mA 3 ERG spike 50 mW @ TA = +60 C -65 to +110 C -65 to +125 C TC = 25 O O O O ELECTRICAL CHARACTERISTICS SYMBOL IP C TEST CONDITIONS ASTD 1020 ASTD 2030 ASTD 3040 ASTD 4050 ASTD 5060 MINIMUM TYPICAL MAXIMUM 100 200 300 400 500 200 300 400 500 600 135 130 125 120 110 400 UNITS µA VF IF = 3 mA ASTD 1020 ASTD 2030 ASTD 3040 ASTD 4050 ASTD 5060 mV VR IR = 500 µA mV A D V A N C E D S E M I C O N D U C T O R, I N C. 7525 ETHEL [ ... ]

ASTD-xxxx PDF Datasheet Download