SN74AS158D

Overview

The SN74AS158D is a high-speed Schottky logic device manufactured by Texas Instruments, functioning as a quad 2-input data selector or multiplexer. It integrates four independent 2-to-1 multiplexing circuits within a single 16-pin SOIC package. The component operates on a standard 5V supply rail, with a specified voltage range of 4.5V to 5.5V. It features a propagation delay of 14 nanoseconds and supports a maximum clock frequency of 125 MHz. The device is designed for surface-mount installation and functions reliably within an ambient temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent 2-to-1 multiplexing channels in a compact surface-mount package
• Delivers high-speed signal switching with a 14 nanosecond propagation delay
• Supports system clock frequencies up to 125 MHz for rapid data routing
• Utilizes high-speed Schottky (ALS) technology for efficient power consumption

Applications

• High-speed digital data routing and selection circuits
• Parallel-to-serial conversion modules
• Computer bus interface systems requiring fast signal switching
• Industrial control logic for process data management

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-Narrow-16 package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the operating environment remains within the specified 0°C to +70°C thermal limits. Validate that the 4.5V to 5.5V power supply constraints are strictly maintained during system design.

Selection Notes

Select this component when high-speed data multiplexing is required within a 5V logic environment. The ALS series offers superior speed compared to standard TTL variants while maintaining lower power dissipation than AS series devices. Consider the 16-pin SOIC footprint for PCB layout compatibility. Verify that the 14ns delay meets the timing requirements of the target application circuit.

Part Context

This part belongs to the Texas Instruments SN74ALS family, which combines the high speed of the SN74AS series with the low power characteristics of the SN74LS series. The SN74ALS158 specifically provides quad multiplexing functionality. It serves as a bridge between legacy LS logic designs and modern high-speed requirements, offering improved performance without significant power penalty.

Replacement Considerations

The SN74ALS158DR is a tape-and-reel variant of the same functional device. Cross-reference with other ALS-series multiplexers if pinout compatibility is required. Verify package dimensions against existing board space constraints before substituting.