CD74HC423MT Equivalent & Substitute Parts

Part Overview

The CD74HC423MT 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, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing designs while meeting current availability and compliance requirements.

Substiute Parts

CD74HC423MT

Texas InstrumentsIn Stock: 2285CD74HC423MT Datasheet

Current PartRFQ

74HC423D,653

Nexperia USA Inc.In Stock: 326674HC423D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HC423MT is determined by the following critical parameters:

• Logic Function: Monostable multivibrator with two independent circuits
• Package Compatibility: 16-SOIC surface mount package (0.154", 3.90 mm width)
• Electrical Specifications: Supply voltage range 2 V to 6 V, output current capability 5.2 mA
• Base Product Series: 74HC423 logic family
• Compliance Requirements: ROHS3 compliance and moisture sensitivity level 1

The 74HC423D,653 from Nexperia USA Inc. qualifies as a direct substitute based on identical logic function, package form factor, electrical operating parameters, and compliance certifications. Variations in propagation delay (20 ns versus 25 ns) and operating temperature range represent performance improvements rather than incompatibilities.

Parameter Comparison

Engineering Selection Recommendations

The 74HC423D,653 from Nexperia USA Inc. is the qualified substitute for the discontinued CD74HC423MT. Both components maintain ROHS3 compliance and identical moisture sensitivity classification. The substitute part offers active product status with current inventory availability, addressing the discontinuation of the original Texas Instruments part.

The 20 ns propagation delay of the substitute represents a performance improvement over the original 25 ns specification. The operating temperature range of the substitute (-40°C to 125°C) is narrower than the original (-55°C to 125°C); applications requiring operation below -40°C must retain the original part or identify alternative solutions.

Both parts share identical package geometry, electrical supply requirements, output current ratings, and circuit configuration, ensuring direct functional compatibility in existing PCB layouts and circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 74HC423D,653 be used as a direct replacement for the CD74HC423MT?

A: Yes. Both parts are monostable multivibrators with two independent circuits in 16-SOIC packages, identical supply voltage ranges (2 V to 6 V), and matching output current specifications (5.2 mA). The substitute meets all functional and physical compatibility requirements.

Q: What is the difference in propagation delay between these parts?

A: The CD74HC423MT specifies 25 ns propagation delay, while the 74HC423D,653 specifies 20 ns. The substitute exhibits faster switching performance. This difference does not create incompatibility; designs tolerant of the original 25 ns specification will function with the faster substitute.

Q: Are there temperature range limitations with the substitute part?

A: The 74HC423D,653 operates from -40°C to 125°C, compared to the original part's -55°C to 125°C range. Applications requiring operation below -40°C cannot use the substitute without additional thermal management or alternative component selection.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the CD74HC423MT and 74HC423D,653 are ROHS3 compliant with moisture sensitivity level 1 (unlimited). Compliance certifications are equivalent.

Q: What is the packaging difference between cut tape and tape & reel formats?

A: The original part is supplied in cut tape (CT) format, while the substitute is supplied in tape & reel (TR) format. Both formats contain identical components in 16-SOIC packages. Tape & reel format is standard for high-volume production and automated assembly processes.