CD74HCT688M Equivalent & Substitute Parts

Part Overview

The CD74HCT688M is an 8-bit identity comparator manufactured by Texas Instruments, designed for magnitude comparison applications with active low output. This component is classified as a logic IC and is currently discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package.

Substiute Parts

CD74HCT688M

Texas InstrumentsIn Stock: 2222CD74HCT688M Datasheet

Current PartRFQ

CD74HCT688M96

Texas InstrumentsIn Stock: 2969CD74HCT688M96 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HCT688M is determined by strict equivalence across the following critical parameters:

• Functional Type: Identity Comparator with 8-bit comparison capability
• Output Configuration: Active Low output with A=B function
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, output current 4mA, propagation delay 34ns @ 4.5V with 50pF load, quiescent current 8 µA
• Package Specification: 20-SOIC surface mount package with identical physical dimensions
• Operating Temperature Range: -55°C ~ 125°C
• Compliance Standards: ROHS3 Compliant, REACH Unaffected

The substitute part CD74HCT688M96 maintains identical electrical and mechanical specifications, differing only in packaging format (Cut Tape and Digi-Reel) and product status (Active vs. Discontinued).

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT688M96 is the direct substitute for the discontinued CD74HCT688M. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications. The CD74HCT688M96 is currently in active production status, ensuring availability for new designs and replacement applications.

Both parts meet ROHS3 compliance and REACH requirements, making them suitable for applications subject to environmental regulations. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage and handling.

Selection between these parts is determined by packaging requirements: the CD74HCT688M96 is available in Cut Tape and Digi-Reel formats, providing flexibility for different procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT688M96 be used as a direct replacement for CD74HCT688M?

A: Yes. Both parts are electrically and mechanically identical 8-bit identity comparators with active low output. They share the same supply voltage range (4.5V ~ 5.5V), output current specifications (4mA), propagation delay (34ns @ 4.5V, 50pF), and 20-SOIC package dimensions.

Q: What is the difference between CD74HCT688M and CD74HCT688M96?

A: The primary difference is product status and packaging format. CD74HCT688M is discontinued, while CD74HCT688M96 is active. CD74HCT688M96 is supplied in Cut Tape and Digi-Reel formats, whereas CD74HCT688M uses standard packaging.

Q: Are there any pin configuration differences between these parts?

A: No. Both parts use the identical 20-SOIC package with the same pin assignments and functional layout.

Q: Do both parts meet the same compliance standards?

A: Yes. Both CD74HCT688M and CD74HCT688M96 are ROHS3 Compliant and REACH Unaffected, with MSL rating of 1 (Unlimited).

Q: What operating temperature range do these parts support?

A: Both parts operate across the temperature range of -55°C to 125°C, suitable for industrial and extended temperature applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the 20-SOIC surface mount package is compatible with your PCB layout and assembly process. The electrical specifications are identical, ensuring functional equivalence.