SN74LS156NG4

Overview

The SN74LS156NG4 is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments SN74LS series. It features open-collector outputs and individual strobes for each section, allowing independent activation or inhibition of the 4-bit sections. The device operates within a supply voltage range of 4.75V to 5.25V and supports a temperature range of 0°C to 70°C. It utilizes a 16-pin plastic small outline package (NSOG-16) for through-hole mounting.

Feature Summary

• Dual configuration providing two independent 1-of-4 decoding or demultiplexing sections within a single package.
• Open-collector output structure suitable for wired-OR logic applications and direct interface with higher voltage loads.
• Individual strobe inputs enable precise control over each section, simplifying cascading for larger decoding tasks.

Applications

• Dual 2-to-4-line decoding circuits
• Dual 1-to-4-line demultiplexing systems
• Memory address decoding in digital systems

Procurement Notes

Verify the specific suffix 'G4' indicates lead-free compliance and RoHS certification as per manufacturer documentation. Confirm the package marking matches the NSOG-16 specification. Ensure the supplier provides official datasheets confirming the open-collector nature of the outputs and the exact electrical characteristics for the LS series logic family.

Selection Notes

Select this component when dual independent decoding channels are required with open-collector outputs. It is suitable for designs needing individual section control via strobes. Consider the LS series speed and power consumption trade-offs compared to HC or HCT families if lower power or faster switching is needed.

Part Context

This part belongs to the standard SN74LS TTL logic family, known for moderate speed and compatibility with standard 5V logic levels. The SN74LS156 variant specifically addresses applications requiring dual demultiplexing or decoding functions without external gating components.

Replacement Considerations

Compatible equivalents include the SN74LS156N and SN74LS156D. Verify pinout compatibility and electrical specifications before substitution. Other manufacturers producing the 74LS156 type may offer functional replacements.