SN74LS42NSR

Overview

The SN74LS42NSR is a Low Power Schottky (LS) TTL BCD-to-decimal decoder manufactured by Texas Instruments. It converts four binary-coded decimal inputs into ten active-low outputs. The device operates within a supply voltage range of 4.75 V to 5.25 V and features a propagation delay of 30 ns. It is housed in a 16-pin SOIC package with a commercial operating temperature range of 0°C to +70°C.

Feature Summary

• Converts 4-bit BCD input codes to one-of-ten active-low decimal outputs
• Utilizes Low Power Schottky technology for reduced power consumption
• Designed for standard 5V logic system integration

Applications

• BCD to decimal decoding circuits
• Data routing and selection systems
• Display driver interfaces

Procurement Notes

Verify the specific suffix 'NSR' indicates the tape-and-reel packaging variant distinct from tube-packaged equivalents like the SN74LS42N. Confirm the manufacturer is Texas Instruments, as other vendors may produce functionally similar parts under different part numbers. Ensure the SOIC-16 footprint matches the target PCB design requirements before finalizing procurement orders.

Selection Notes

Select this component when a single-channel BCD-to-decimal decoder is required in surface-mount applications. The LS series offers a balance of speed and power efficiency suitable for general-purpose digital logic. Verify that the active-low output polarity aligns with downstream circuit requirements, as alternative decoders may provide active-high outputs.

Part Context

This part belongs to the Texas Instruments SN74LS family of logic integrated circuits. The SN74LS42 specifically implements the classic 4-line to 10-line decoding function. It is distinct from multiplexers or shift registers within the broader logic catalog, serving exclusively as a decoder for address or control line translation.