This part is a kind of semiconductor called AN6123MS.
Function of this product has Speech network IC with ALC.
Manufacturers : Panasonic Semiconductor
Image and pinout :
Some of the text within the PDF file :
ICs for Telephone AN6123MS Speech network IC with ALC s Overview The AN6123MS is an ALC IC for level control of audio signal (300 Hz to 3 kHz). Adopting a mini 5-pin package, mounting on a small area is possible. 1.9 ± 0.1 0.95 1 0.95 2 0.1 to 0.3 0.10 0.16 + − 0.06 0.25 1.5 + − 0.05 0.2 2.8 + − 0.3 Unit: mm 0.65 ± 0.15 s Features • Wide supply voltage operation range of VCC = 2.4 V to 6.0 V • Small current consumption of ICC = 500 µA • Reduction of a bad effect by the external noise thanks to a package for a rear side mounting. 5 4 0.3 0.2 2.9 + − 0.05 3 0.4 ± 0.2 0.2 1.1 + − 0.1 + 0.1 − 0.05 1.45 ± 0.1 • Cordless telephone, PDC, PHS telephone MINI-5D s Block Diagram Input Output GND 3 4 DET gm DET 2 VCC 1 5 0 to 0.1 s Applications 0.8 0.65 ± [ ... ]