CD74HC147M

Signal Switches, Multiplexers, Decoders Overview

The CD74HC147M is a high-speed silicon-gate CMOS priority encoder manufactured by Harris Corporation. It encodes ten decimal input lines into four binary-coded decimal (BCD) output lines. The device operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to 125°C. It utilizes a 16-pin Small Outline (SOIC) surface-mount package, specifically PDSO16, with dimensions of 9.9 x 3.91 x 1.58mm. The component is pin-compatible with low-power Schottky TTL (LSTTL) standards.

Signal Switches, Multiplexers, Decoders Feature Summary

• Encodes ten active-low decimal inputs into four active-low BCD outputs
• Designed for direct interface with switch arrays or keypad matrices
• Compatible with LSTTL logic families for system integration

Signal Switches, Multiplexers, Decoders Applications

• Encoding 10-position mechanical switches
• Keypad scanning systems
• Decimal-to-BCD code conversion circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments acquired Harris Semiconductor's logic assets. Confirm the specific suffix 'M' denotes the SOIC package variant rather than the DIP version. Check RoHS compliance status, as original Harris-era components may not meet current environmental regulations. Ensure the source provides valid traceability documentation for this discontinued part number.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a 10-to-4 priority encoding function is required in a space-constrained design due to its surface-mount form factor. Consider the wide industrial temperature range (-55°C to 125°C) for harsh environments. Verify that the active-low output polarity aligns with downstream logic requirements without additional inversion stages.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices. The 'CD' prefix typically indicates commercial grade temperature variants, while the 'HCT' variant would ensure TTL-compatible input thresholds. As a legacy Harris product, it represents the transition period before Texas Instruments fully consolidated the logic portfolio under their brand name.