DM74157N

Overview

The DM74157N is a quad 2-line to 1-line data selector/multiplexer manufactured by onsemi. It contains four independent multiplexers, each selecting one of two data inputs (A or B) based on a common select line and routing the chosen signal to a dedicated output (Y). The device features buffered inputs and outputs with an active-low strobe input for enabling operation. It operates within a supply voltage range of 4.75V to 5.25V and supports a free air operating temperature range of 0°C to +70°C.

Feature Summary

• Contains four independent 2-to-1 multiplexers sharing a single select input
• Features buffered inputs and outputs for improved signal integrity
• Includes an active-low strobe input to enable or disable data selection

Applications

• Multiplexing dual data buses
• Generating logic functions of two variables
• Selecting data sources for programmable counters

Procurement Notes

Verify component authenticity as this part may be obsolete or sourced from third-party distributors. Confirm package integrity and pin alignment against the 16-Lead Plastic Dual-In-Line specification. Ensure the supplier provides traceability documentation matching the original Fairchild Semiconductor manufacturing records.

Selection Notes

Select this component when a compact solution for routing four parallel data lines from two sources is required. It is suitable for applications needing a common select mechanism for multiple channels. Verify that the TTL-compatible input levels and open-collector-like drive capabilities meet the system interface requirements.

Part Context

This device belongs to the standard 7400 series logic family, specifically designed for digital data routing tasks. Originally produced by Fairchild Semiconductor, it represents a classic implementation of multiplexing functionality using bipolar transistor technology. The DM74157N serves as a foundational building block in legacy digital circuit designs requiring parallel data selection.

Replacement Considerations

Direct substitutes include the SN74157N from Texas Instruments. Verify pin compatibility and electrical characteristics before substitution. Other compatible variants may exist within the 74LS157 or 74HC157 families, though logic speed and power consumption will differ.