SN7438DRE4

Overview

The SN7438DRE4 is a quad NAND gate integrated circuit manufactured by Texas Instruments, belonging to the standard 7400 logic series. It features open-collector outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides four independent two-input NAND gates in a 14-pin SOIC package. Key electrical specifications include a maximum propagation delay of 22 ns at 5 V with a 45 pF load, a static current consumption of up to 8.5 mA, and output drive capabilities of -48 mA for both high and low states. It supports surface mount installation and functions reliably across an operating temperature range of 0°C to 70°C.

Feature Summary

• Features open-collector outputs suitable for wired-AND configurations and interfacing with higher voltage loads
• Provides four independent two-input NAND logic gates within a single compact package
• Designed for robust operation within standard 5 V digital logic systems

Applications

• General-purpose digital logic switching and signal inversion
• Wired-AND bus implementations requiring open-drain/open-collector topology
• Interfacing between different voltage domains or driving indicator loads

Procurement Notes

Verify the specific suffix 'E4' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 14-SOIC package dimensions match your PCB footprint requirements. Ensure the 0°C to 70°C commercial temperature range aligns with your system's environmental conditions. Cross-reference the datasheet for exact pinout assignments and electrical limits before finalizing procurement.

Selection Notes

Select this component when open-collector NAND functionality is required for 5 V logic applications. It is appropriate for designs needing wired-AND capabilities or direct driving of external loads beyond standard CMOS limits. Consider the 22 ns propagation delay for timing constraints. Verify that the commercial temperature range meets operational needs compared to industrial variants.

Part Context

This part belongs to the legacy 7400 series of logic ICs, widely recognized for compatibility with TTL logic levels. The SN7438 variant specifically offers open-collector outputs, distinguishing it from standard push-pull NAND gates like the SN7400. The 'DRE4' designation specifies the surface-mount SOIC package and manufacturing attributes defined by Texas Instruments.

Replacement Considerations

SN7438DR: Identical functional equivalent without the E4 suffix. SN7438DG4: Lead-free version with similar packaging. SN7406: Hex inverter with open-collector outputs, offering different logic function but compatible output structure.