SN74HC148NS

Overview

The SN74HC148NS is a priority encoder integrated circuit manufactured by Texas Instruments, belonging to the 74HC logic series. It features a single 8-to-3 line encoding circuit housed in a 16-pin SOIC package. The device operates on a single power supply with a voltage range of 2V to 6V. It provides high-level and low-level output currents of 5.2mA each. The component is designed for surface-mount installation and functions within an operating temperature range of -40°C to 85°C.

Feature Summary

• Encodes eight active-low inputs into a three-bit binary code with priority handling
• Provides active-low outputs for data representation and enable signals
• Supports cascading via dedicated enable input and output pins

Applications

• Interrupt controller systems requiring priority resolution
• Keyboard encoding circuits
• Data acquisition systems

Procurement Notes

Verify the specific suffix against official documentation, as the provided model lacks the standard 'R' tape-and-reel indicator found in common variants like SN74HC148NSR. Confirm package dimensions and pinout compatibility with design files. Ensure RoHS compliance status matches current manufacturing records. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select this component when an 8-input priority encoder is required within the 74HC family specifications. Ensure the design accommodates the 16-SOIC package constraints and the 2V to 6V supply voltage range. Verify that the 5.2mA drive capability meets load requirements. Consider thermal management for the specified -40°C to 85°C operating range if ambient conditions are extreme.

Part Context

This part belongs to the SN74HC148 family of priority encoders produced by Texas Instruments. It is a member of the broader 74HC series, which utilizes high-speed CMOS technology. The family typically includes variants with different packaging options such as SOIC, DIP, and TSSOP, all sharing the same logical functionality but differing in physical form factor and mounting style.

Replacement Considerations

SN74HC148DR: Texas Instruments direct replacement in SOIC-16 package.