CD74HC123ME4 Equivalent & Substitute Parts

Part Overview

The CD74HC123ME4 is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component features two independent circuits with a 25 ns propagation delay and operates across a 2 V to 6 V supply voltage range. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

CD74HC123ME4

Texas InstrumentsIn Stock: 969CD74HC123ME4 Datasheet

Current PartRFQ

CD74HC123M96

Texas InstrumentsIn Stock: 50187CD74HC123M96 Datasheet

DirectRFQ

74HC123D,653

Nexperia USA Inc.In Stock: 198674HC123D,653 Datasheet

MFR RecommendedRFQ

74HC123D-Q100,118

Nexperia USA Inc.In Stock: 320374HC123D-Q100,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HC123ME4 is determined by the following critical parameters:

• Logic Type & Circuit Count: All substitutes must be monostable multivibrators with 2 independent circuits
• Package Compatibility: All substitutes use 16-SOIC surface mount packaging with identical physical dimensions
• Electrical Specifications: Supply voltage range (2 V ~ 6 V), output current (5.2 mA), and base product number (74HC123) must match
• Compliance & Standards: RoHS3 compliance and REACH unaffected status required

The substitute parts are grouped into two categories based on propagation delay performance and product availability status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74HC123M96

The CD74HC123M96 from Texas Instruments is the direct functional equivalent, maintaining identical propagation delay (25 ns) and operating temperature range (-55°C ~ 125°C). This part is currently active in production with substantial inventory availability (50,100 pcs), ensuring long-term supply continuity. It carries the same RoHS3 compliance and REACH unaffected status as the original part.

Secondary Substitutes: 74HC123D,653 and 74HC123D-Q100,118

Both Nexperia parts are functionally compatible alternatives with the same electrical specifications and package form factor. These parts feature a propagation delay of 65 ns, which is acceptable for applications where timing margins permit the extended delay. The 74HC123D-Q100,118 variant includes AEC-Q100 automotive qualification, suitable for automotive-grade applications. Both parts are active with confirmed inventory availability.

Compatibility Considerations

All substitute parts maintain the 2 V to 6 V supply voltage range, 5.2 mA output current specifications, and 16-SOIC package dimensions. The primary design consideration is propagation delay tolerance: applications requiring 25 ns performance must use CD74HC123M96, while 65 ns delay is acceptable for less timing-critical circuits.

Frequently Asked Questions (FAQ)

Q: Can CD74HC123M96 be used as a direct replacement for CD74HC123ME4?

A: Yes. CD74HC123M96 is electrically and mechanically identical to CD74HC123ME4, with matching propagation delay (25 ns), operating temperature range (-55°C ~ 125°C), and package specifications. Both are Texas Instruments products with ROHS3 compliance.

Q: What is the difference between the 25 ns and 65 ns propagation delay variants?

A: Propagation delay determines the time required for the output to respond to input changes. The CD74HC123ME4 and CD74HC123M96 feature 25 ns delay, while the Nexperia parts (74HC123D,653 and 74HC123D-Q100,118) feature 65 ns delay. Selection depends on circuit timing requirements; faster applications require the 25 ns variant.

Q: Are the Nexperia parts (74HC123D,653 and 74HC123D-Q100,118) suitable replacements?

A: Nexperia parts are functionally compatible for applications tolerating 65 ns propagation delay. They maintain identical supply voltage range, output current, package form factor, and compliance standards. Operating temperature range is reduced to -40°C ~ 125°C compared to the original -55°C ~ 125°C specification.

Q: What does AEC-Q100 qualification mean for the 74HC123D-Q100,118?

A: AEC-Q100 is an automotive industry qualification standard. The 74HC123D-Q100,118 meets automotive-grade reliability and testing requirements, making it suitable for automotive applications where such qualification is specified.

Q: Are all substitute parts available in the same packaging options?

A: CD74HC123M96 is available in Cut Tape (CT) and Digi-Reel packaging. The Nexperia 74HC123D,653 is available in Cut Tape and Digi-Reel. The 74HC123D-Q100,118 is available in Tape & Reel (TR) format. All use identical 16-SOIC surface mount packages.

Q: Do all parts meet RoHS3 compliance?

A: Yes. CD74HC123ME4, CD74HC123M96, 74HC123D,653, and 74HC123D-Q100,118 are all ROHS3 compliant with REACH unaffected status.