SN74HC148DRG4

Overview

The SN74HC148DRG4 is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It encodes eight active-low data inputs into a 3-bit binary code with active-low outputs. The device features an enable input (EI) and cascading signals, including an enable output (EO) and group signal (GS), allowing for expansion without external logic. It operates within a supply voltage range of 2V to 6V and supports a recommended operating temperature of -40°C to +85°C. Key electrical characteristics include a maximum propagation delay of 45ns at 4.5V and low power consumption.

Feature Summary

• Encodes eight active-low data lines into three active-low binary outputs
• Provides priority decoding to ensure only the highest-order active input is encoded
• Includes enable input (EI) and enable output (EO) signals for cascading multiple stages

Applications

• N-bit encoding systems
• Code converters and generators

Procurement Notes

Verify that the ordering suffix 'G4' corresponds to the specific lead-free and RoHS-compliant variant as defined in the manufacturer's documentation. Confirm the package type matches the required SOIC-16 footprint and check the moisture sensitivity level rating before assembly. Ensure the component status is listed as active production rather than NRND or obsolete.

Selection Notes

Select this component when designing circuits requiring priority encoding of up to eight digital signals. It is suitable for applications needing cascaded expansion capabilities via dedicated control pins. Consider the HC logic family requirements regarding input handling and supply voltage compatibility with the target system architecture.

Part Context

This part belongs to the SNx4HC148 series of priority encoders produced by Texas Instruments. The 'SN' prefix indicates standard commercial grade performance, while 'HC' denotes High-speed CMOS technology. The 'D' suffix specifies the SOIC surface-mount package, and 'G4' identifies the green/RoHS-compliant manufacturing version.

Replacement Considerations

Public confirmed substitute part numbers include SN74HC148DR and SN74HC148DRE4.