74HC423D,652 Equivalent & Substitute Parts

Part Overview

The 74HC423D,652 is a monostable multivibrator logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This component features two independent circuits with a 20 ns propagation delay and operates across a 2 V to 6 V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74HC423D,652

Nexperia USA Inc.In Stock: 71374HC423D,652 Datasheet

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CD74HC423M

Texas InstrumentsIn Stock: 3204CD74HC423M Datasheet

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CD74HC423MT

Texas InstrumentsIn Stock: 2285CD74HC423MT Datasheet

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CD74HC423NSR

Texas InstrumentsIn Stock: 1413CD74HC423NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC423D,652 are qualified based on the following criteria:

• Logic Function: All substitutes must be monostable multivibrator circuits with two independent circuits
• Package Compatibility: Surface mount 16-pin SOIC or 16-pin SO packages with compatible pinouts
• Electrical Parameters: Supply voltage range (2 V ~ 6 V), output current capability (5.2 mA), and operating temperature range
• Series Compatibility: All substitutes belong to the 74HC logic family
• Compliance: RoHS3 compliance and MSL rating of 1 (Unlimited)

The three qualified substitutes—CD74HC423M, CD74HC423MT, and CD74HC423NSR—all share the same base product number (74HC423) and maintain functional equivalence with the main part. Differences in propagation delay (25 ns vs. 20 ns) and operating temperature range (-55°C ~ 125°C vs. -40°C ~ 125°C) are within acceptable substitution parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain functional and electrical equivalence with the 74HC423D,652 within the parameters specified for this component category. Selection among substitutes should be based on the following factors:

CD74HC423M and CD74HC423MT: Both Texas Instruments parts offer extended operating temperature range (-55°C ~ 125°C) compared to the main part (-40°C ~ 125°C). These parts are suitable for applications requiring broader temperature performance. CD74HC423M is supplied in tube packaging, while CD74HC423MT is supplied in cut tape format. Both maintain the 0.154" (3.90 mm) package width.

CD74HC423NSR: This Texas Instruments part also provides extended operating temperature range (-55°C ~ 125°C) and is supplied in cut tape and Digi-Reel packaging. The package width is 0.209" (5.30 mm), which differs from the main part and the other two substitutes. This dimensional difference may affect PCB layout compatibility.

All substitutes carry ROHS3 compliance and MSL rating of 1 (Unlimited), matching the main part's environmental and regulatory status.

Frequently Asked Questions (FAQ)

Q: Can CD74HC423M, CD74HC423MT, and CD74HC423NSR be used interchangeably with 74HC423D,652?

A: Yes, within the electrical and functional parameters specified. All three substitutes are monostable multivibrator circuits with two independent circuits, identical output current ratings, and compatible supply voltage ranges. The 25 ns propagation delay of the substitutes is acceptable for applications designed around the 20 ns specification of the main part.

Q: What is the significance of the different package widths between CD74HC423NSR and the other parts?

A: CD74HC423NSR uses a 16-SOIC package with 0.209" (5.30 mm) width, while 74HC423D,652, CD74HC423M, and CD74HC423MT use 16-SOIC packages with 0.154" (3.90 mm) width. This dimensional difference may require PCB layout modifications if CD74HC423NSR is substituted for the main part or the other two alternatives.

Q: Why do the substitute parts have a 25 ns propagation delay instead of 20 ns?

A: The 25 ns propagation delay of the Texas Instruments substitutes is within acceptable substitution parameters for the 74HC423 logic family. Applications designed for the 20 ns specification will operate correctly with the 25 ns delay, as the difference represents a 5 ns margin that does not affect functional compatibility in standard monostable multivibrator applications.

Q: Are all parts RoHS3 compliant?

A: Yes, the main part 74HC423D,652 and all three substitutes (CD74HC423M, CD74HC423MT, CD74HC423NSR) are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the difference between tube, cut tape, and Digi-Reel packaging?

A: These are packaging and delivery formats. Tube packaging supplies components in plastic tubes, cut tape supplies components on individual tape segments, and Digi-Reel supplies components on continuous tape reels. The electrical and functional characteristics of the components remain identical regardless of packaging format.

Q: Can these parts operate at temperatures below -40°C?

A: The main part 74HC423D,652 operates from -40°C to 125°C. The three substitutes (CD74HC423M, CD74HC423MT, CD74HC423NSR) extend the lower operating temperature to -55°C, providing broader temperature range capability if required by the application.