SN74LS27D

Inverter Gates Overview

The SN74LS27D is a Triple 3-Input Positive-NOR Gate manufactured by Texas Instruments. It belongs to the LS (Low-power Schottky) logic family and features three independent NOR gates, each with three inputs. The device is housed in a 14-pin SOIC package. Key electrical parameters include a low-level output current of 8 mA and a high-level output current of -400 µA. The propagation delay time is specified at 10 ns. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range from 0°C to +70°C.

Inverter Gates Feature Summary

• Provides three independent 3-input positive-NOR logic functions
• Utilizes Low-power Schottky technology for enhanced speed and power efficiency
• Designed for surface-mount installation via SOIC-14 packaging

Inverter Gates Applications

• Digital logic circuit design requiring multi-input NOR operations
• Industrial control systems utilizing standard TTL-compatible logic levels
• Embedded hardware interfaces needing reliable boolean logic processing

Inverter Gates Procurement Notes

Verify the specific suffix 'D' indicates the SOIC-14 package variant. Confirm the LS logic family designation matches system requirements. Check for RoHS compliance status if environmental regulations apply. Ensure the manufacturer is Texas Instruments or an authorized source to guarantee authenticity and performance specifications.

Inverter Gates Selection Notes

Select this component when triple 3-input NOR functionality is required in a compact surface-mount form factor. The LS series offers a balance of speed and power consumption suitable for general-purpose digital applications. Consider the 10 ns propagation delay and 8 mA sink capability against load requirements. Verify compatibility with existing 5V logic families in the target design.

Inverter Gates Part Context

This part is part of the broader Texas Instruments SN74xx logic family, specifically the LS sub-family known for improved performance over standard TTL. It serves as a fundamental building block for complex digital circuits. The device is classified as obsolete but remains documented for legacy system maintenance and reference designs.

Inverter Gates Replacement Considerations

Direct substitutes may include other SN74LS27 variants with different package options such as PDIP-14. Cross-reference with equivalent parts from other manufacturers offering LS-series triple 3-input NOR gates. Ensure pinout compatibility and electrical parameter alignment before substitution.