CD74HC688M96 Equivalent & Substitute Parts

Part Overview

The CD74HC688M96 is an 8-bit identity comparator manufactured by Texas Instruments, designed for magnitude comparison applications with active low output. This device is classified as an active product and is widely used in digital logic circuits requiring bit-level comparison functionality. Alternative part numbers may be necessary due to inventory availability, packaging preferences, or supply chain considerations while maintaining functional equivalence.

Substiute Parts

CD74HC688M96

Texas InstrumentsIn Stock: 2916CD74HC688M96 Datasheet

Current PartRFQ

74HC688D,653

Nexperia USA Inc.In Stock: 496474HC688D,653 Datasheet

MFR RecommendedRFQ

74HCT02D,653

Nexperia USA Inc.In Stock: 899474HCT02D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC688M96 is determined by the following critical parameters:

Primary Substitution Criteria:

• Device Type: Identity Comparator with 8-bit functionality
• Output Configuration: Active Low output with A=B function
• Voltage Supply Range: 2V ~ 6V compatibility
• Output Characteristics: 5.2mA output current capability
• Propagation Delay: 29ns maximum at specified conditions
• Package Type: 20-SOIC form factor
• Series Classification: 74HC logic family
• Product Status: Active manufacturing status
• Compliance: ROHS3 Compliant, MSL Level 1

The 74HC688D,653 manufactured by Nexperia USA Inc. qualifies as a direct functional equivalent, maintaining identical bit count, output function, voltage supply range, output current specifications, and propagation delay characteristics within the same 20-SOIC package footprint.

The 74HCT02D,653 does not qualify as a functional substitute due to fundamental differences in device type (NOR Gate versus Identity Comparator), logic family (74HCT versus 74HC), voltage supply requirements (4.5V ~ 5.5V versus 2V ~ 6V), and package configuration (14-SO versus 20-SOIC).

Parameter Comparison

Engineering Selection Recommendations

74HC688D,653 (Nexperia USA Inc.): This part is a valid functional equivalent to the CD74HC688M96. Both devices maintain identical electrical specifications for bit count, output function, voltage supply range, output current, and propagation delay. The packaging is equivalent (20-SOIC), and both are active products with ROHS3 compliance and MSL Level 1 rating. The primary difference is the operating temperature minimum of -40°C versus -55°C for the main part; this distinction applies only to applications requiring operation below -40°C. Packaging format differs between Tape & Reel (TR) for the main part and Cut Tape (CT) & Digi-Reel® for the substitute, which may affect procurement and assembly workflows.

74HCT02D,653 (Nexperia USA Inc.): This part is not suitable as a substitute for the CD74HC688M96. The devices belong to different logic families (74HCT versus 74HC) with incompatible voltage supply requirements (4.5V ~ 5.5V versus 2V ~ 6V). The 74HCT02D,653 is a NOR gate with fundamentally different functionality compared to the 8-bit identity comparator architecture of the CD74HC688M96. Pin configuration, package type (14-SOIC versus 20-SOIC), and circuit topology are not interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the 74HC688D,653 replace the CD74HC688M96 in all applications?

A: The 74HC688D,653 is functionally equivalent for applications operating within the -40°C to 125°C temperature range. Applications requiring operation below -40°C must use the CD74HC688M96 or verify alternative solutions. Both devices share identical electrical specifications, output characteristics, and package footprint.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel packaging is supplied on continuous tape for automated assembly processes. Cut Tape & Digi-Reel® packaging provides smaller quantities on tape segments suitable for manual or lower-volume assembly. Both formats contain the same component; the difference is in supply format and quantity per reel.

Q: Why is the 74HCT02D,653 listed if it cannot substitute the CD74HC688M96?

A: The 74HCT02D,653 is included in the provided substitute list but does not meet substitution criteria due to fundamental functional and electrical incompatibilities. It is presented for reference to clarify why certain parts are not suitable alternatives.

Q: Are there any pin-to-pin compatibility concerns between the CD74HC688M96 and 74HC688D,653?

A: Both devices use the 20-SOIC package with identical pin assignments for the 8-bit identity comparator function. Pin-to-pin compatibility is maintained, allowing direct board-level substitution without circuit modification.

Q: What compliance certifications apply to both the main part and substitute?

A: Both the CD74HC688M96 and 74HC688D,653 are ROHS3 compliant, REACH unaffected, and classified as MSL Level 1 (Unlimited moisture sensitivity). Both carry EAR99 export classification and HTSUS code 8542.39.0001.