CD74HC423M Equivalent & Substitute Parts

Part Overview

The CD74HC423M is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component is designed for timing and pulse generation applications requiring 25 ns propagation delay performance. The part is currently discontinued at DiGi Electronics, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

CD74HC423M

Texas InstrumentsIn Stock: 3204CD74HC423M Datasheet

Current PartRFQ

74HC423D,653

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HC423M is determined by the following critical parameters:

• Logic Function: Monostable multivibrator with 2 independent circuits
• Package Compatibility: 16-SOIC surface mount form factor (0.154", 3.90mm width)
• Electrical Specifications: Supply voltage range 2 V ~ 6 V, output current capability 5.2 mA
• Base Product Series: 74HC423 logic family
• Compliance Requirements: ROHS3 compliance and EAR99 classification

The 74HC423D,653 from Nexperia USA Inc. qualifies as a direct substitute based on identical logic function, package form factor, electrical performance envelope, and regulatory compliance. Propagation delay variance (20 ns vs. 25 ns) represents improved performance within the same functional class.

Parameter Comparison

Engineering Selection Recommendations

The 74HC423D,653 from Nexperia USA Inc. is the qualified substitute for the discontinued CD74HC423M. Selection is based on:

• Functional Equivalence: Both devices implement identical monostable multivibrator logic with 2 independent circuits
• Package Compatibility: Identical 16-SOIC surface mount package ensures PCB layout compatibility without redesign
• Electrical Performance: Matching supply voltage range, output current specifications, and propagation delay within acceptable tolerance
• Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification
• Availability: The Nexperia part maintains active product status with confirmed inventory

The primary design consideration is the operating temperature range difference: the Nexperia substitute operates from -40°C to 125°C versus the original -55°C to 125°C. Applications requiring operation below -40°C require design review and alternative sourcing.

Frequently Asked Questions (FAQ)

Q: Can the 74HC423D,653 be used as a direct replacement for CD74HC423M without PCB modifications?

A: Yes. Both parts use identical 16-SOIC surface mount packaging with matching pinout and electrical specifications. No PCB layout changes are required.

Q: What is the significance of the propagation delay difference (25 ns vs. 20 ns)?

A: The Nexperia substitute exhibits faster propagation delay, representing improved performance. This is compatible with designs specified for the original 25 ns part. Timing-critical applications should verify that faster switching does not introduce unintended circuit behavior.

Q: Are there temperature range limitations when substituting?

A: The Nexperia part operates from -40°C minimum versus -55°C for the original. Applications requiring operation below -40°C must source alternative components or conduct design review for temperature derating.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both CD74HC423M and 74HC423D,653 are ROHS3 compliant and classified as EAR99 for export control purposes.

Q: What packaging format is the substitute available in?

A: The 74HC423D,653 is supplied in Tape & Reel (TR) format, standard for production volume applications. Verify packaging format compatibility with assembly processes.