SN74LS157MEL

Overview

The SN74LS157MEL is a quadruple 2-input multiplexer manufactured by onsemi using the Low Power Schottky (LSTTL) process. It features four independent data selectors with common select and enable inputs, routing selected data to buffered non-inverting outputs. The device operates at a standard supply voltage of 5 V and supports an operating temperature range of -55 °C to +125 °C. It utilizes a 16-lead ceramic dual-in-line package (CDIP) designed for high reliability in military and aerospace environments.

Feature Summary

• High-speed operation achieved through the Low Power Schottky semiconductor process
• Glitch-free multiplexing circuitry ensures stable signal transitions during switching
• Military-grade construction utilizing hermetic ceramic packaging for environmental resilience

Applications

• Aerospace avionics systems requiring radiation-hardened or high-reliability logic components
• Military communication equipment operating under extreme thermal conditions
• Data acquisition systems requiring precise selection between multiple input sources

Procurement Notes

Verify that the specific suffix 'MEL' corresponds to the manufacturer's military-grade ceramic dual-in-line package specification. Confirm compliance with relevant defense standards such as MIL-PRF-38534 or equivalent agency requirements. Ensure the component meets the specified -55 °C to +125 °C operating temperature range for your intended application environment before finalizing procurement.

Selection Notes

Select this component when high-speed LSTTL performance is required alongside strict environmental durability. The ceramic package provides superior protection against moisture and mechanical stress compared to plastic variants. This part is suitable for designs where long-term reliability and wide temperature tolerance are critical constraints.

Part Context

This component belongs to the SN54/74LS157 family of quadruple 2-input multiplexers. While functionally identical to the SN74LS157N, the 'MEL' designation indicates a specialized military-grade variant. It shares the same logical functionality but differs in physical construction and environmental qualification to meet rigorous industry standards.

Replacement Considerations

Direct functional substitutes include the SN74LS157N and DM74LS157N. For military applications, verify compatibility with other ceramic packages from manufacturers like Texas Instruments or Motorola.