CD74HC123MT Equivalent & Substitute Parts

Part Overview

The CD74HC123MT is a monostable multivibrator logic integrated circuit manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This device features two independent circuits with a 25 ns propagation delay and operates across a 2 V to 6 V supply voltage range. The CD74HC123MT is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD74HC123MT

Texas InstrumentsIn Stock: 11170CD74HC123MT 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 CD74HC123MT is determined by the following critical parameters: logic type (monostable multivibrator), independent circuit count (2), package type (16-SOIC), mounting method (surface mount), supply voltage range (2 V ~ 6 V), output current capability (5.2 mA), and base product number (74HC123). Substitute parts must maintain compatibility across these electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Functional Equivalent (Packaging Variant): CD74HC123M96 maintains identical electrical specifications and propagation delay (25 ns) with a packaging difference (Cut Tape & Digi-Reel versus Tape & Reel).

Functional Equivalent with Performance Trade-off: 74HC123D,653 and 74HC123D-Q100,118 share the same logic function, circuit count, and package footprint but operate with a longer propagation delay (65 ns) and a narrower operating temperature range (-40°C ~ 125°C versus -55°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

CD74HC123M96 is the primary substitute for the CD74HC123MT. Both parts are manufactured by Texas Instruments, maintain identical electrical performance (25 ns propagation delay), and operate across the full temperature range (-55°C ~ 125°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect electrical compatibility or PCB assembly. This part is currently active and widely available.

74HC123D,653 and 74HC123D-Q100,118 are secondary substitutes manufactured by Nexperia USA Inc. Both parts are active and ROHS3 compliant. These substitutes introduce two design considerations: propagation delay increases from 25 ns to 65 ns, and the operating temperature range narrows to -40°C ~ 125°C. The 74HC123D-Q100,118 variant includes AEC-Q100 automotive qualification and is supplied on Tape & Reel. Selection of these parts requires confirmation that the extended propagation delay and reduced low-temperature operating range are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can CD74HC123M96 be used as a direct replacement for CD74HC123MT?

A: Yes. CD74HC123M96 is electrically and functionally identical to CD74HC123MT. Both parts share the same propagation delay (25 ns), output current specifications, supply voltage range, and operating temperature range. The difference is packaging format only, which does not affect circuit performance or PCB assembly compatibility.

Q: What is the impact of using 74HC123D,653 or 74HC123D-Q100,118 as substitutes?

A: These Nexperia parts introduce two differences: propagation delay increases from 25 ns to 65 ns, and the minimum operating temperature rises from -55°C to -40°C. Applications requiring the original 25 ns timing specification or operation below -40°C must use CD74HC123M96 instead. All other electrical parameters remain compatible.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints and assembly processes are identical across all four parts.

Q: What is the difference between the packaging options listed?

A: CD74HC123MT is supplied on Tape & Reel (TR). CD74HC123M96 is supplied on Cut Tape (CT) & Digi-Reel. 74HC123D-Q100,118 is supplied on Tape & Reel (TR). These are distribution and handling formats only and do not affect the electrical or mechanical specifications of the component itself.

Q: Are all substitute parts RoHS compliant?

A: Yes. CD74HC123MT, CD74HC123M96, 74HC123D,653, and 74HC123D-Q100,118 are all ROHS3 compliant and REACH unaffected.

Q: Which substitute should be selected for automotive applications?

A: 74HC123D-Q100,118 is qualified to AEC-Q100 automotive standards and is the appropriate choice for automotive applications. This part is manufactured by Nexperia USA Inc. and is currently active.