This part is a kind of semiconductor called HCF4001B.

Function of this product has NOR GATE.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

HCC/HCF4000B-4001B HCC/HCF4002B-4025B NOR GATE 4000B–DUAL 3 INPUT PLUS INVERTER 4001B–QUAD 2 INPUT 4002B-DUAL 4 INPUT 4025B TRIPLE 3 INPUT micropackage. The HCC/HCF4000B, HCC/HCF4001B, HCC/HCF 4002B and HCC/HCF4025B nor gate provide the system designer with direct implementation of the nor function and supplement the existing family of COS/MOS gates. All inputs and outputs are buffered. . . . . . . . . PROPAGATION DELAY TIME = 60 ns (typ.) AT CL = 50 pF, VDD = 10 V BUFFERED INPUTS AND OUTPUTS STANDARDIZED SYMMETRICAL OUTPUT CHARACTERISTICS QUIESCENT CURRENT SPECIFIED TO 20 V FOR HCC DEVICE 5V, 10V AND 15V PARAMETRIC RATINGS INPUT CURRENT OF 100nA AT 18V AND 25 oC FOR HCC DEVICE 100% TESTED FOR QUIESCENT CURRENT MEETS ALL REQUIREMENTS OF JEDEC TENTATIVE STANDARD N. 13A, ” STANDARD S [ ... ]

HCF4001B PDF Datasheet Download