SN7438NSR

Overview

The SN7438NSR is a quad two-input positive-NAND buffer manufactured by Texas Instruments, belonging to the standard 7400 logic series. It features open-collector outputs and is housed in a 14-pin SOIC surface-mount package. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a maximum propagation delay of 22 ns at 5 V with 45 pF load. It functions reliably across an operating temperature range of 0°C to 70°C.

Feature Summary

• Provides four independent two-input NAND logic gates
• Features open-collector output configuration for flexible interfacing
• Designed for standard 5 V TTL logic applications

Applications

• General-purpose digital logic buffering
• Open-collector driving for higher voltage or current loads
• Wired-OR logic implementation

Procurement Notes

Verify that the specific order matches the SN7438NSR designation, including the NSR suffix which indicates the SOIC-14 tape-and-reel packaging format. Confirm compliance with RoHS standards as indicated in official documentation. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this component when a quad NAND gate with open-collector outputs is required for 5 V systems. The open-collector design allows for level shifting and wired-logic connections not possible with standard push-pull outputs. Consider the 22 ns propagation delay and 48 mA sink capability against system timing and drive requirements.

Part Context

This part belongs to the Texas Instruments SN7400 family of basic logic gates. The SN7438 variant specifically provides open-collector outputs, distinguishing it from standard NAND gates like the SN7400. It serves as a fundamental building block for combinational logic circuits in industrial and consumer electronics.

Replacement Considerations

Compatible substitutes include SN7438DR (same function, different reel quantity) and SN7438N (DIP package). Cross-reference with other manufacturers' equivalents such as MC74LS38 or CD74HC38, noting differences in speed and power consumption.