The S5437/N7437 is a NAND Gate (output low only when all inputs are high) the same as N7400 except that it will drive 3 times as many loads. The S5438/N7438 is also a NAND Gate but is open-collector similar to N7403. Each one is the same pinout
The S5437/N7437 and S5438/N7438 contain four 2-input NAND gates in a package with a guaranteed fan-out of 3D-Series 54/74 loads in both the logical “1” (1.2mA), and logical “0” (48mA) states. The S5438/N7438 has an open collector output for “WIRE–AND” applications but still retains the high sink current capability of the S5437/N7437.
Manufactured: 1976 week 15