74HCT423D,112 Equivalent & Substitute Parts

Part Overview

The 74HCT423D,112 is a monostable multivibrator logic IC manufactured by NXP USA Inc., designed for timing and pulse generation applications. This device features two independent circuits with a 22 ns propagation delay and operates across a 4.5 V to 5.5 V supply range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

74HCT423D,112

NXP USA Inc.In Stock: 108474HCT423D,112 Datasheet

Current PartRFQ

CD74HCT423M96

Texas InstrumentsIn Stock: 1452CD74HCT423M96 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT423D,112 is determined by the following critical parameters:

• Logic Family & Function: Both parts must be 74HCT series monostable multivibrators with two independent circuits
• Package Compatibility: 16-SOIC surface mount package with identical 0.154" (3.90 mm) width
• Electrical Specifications: Supply voltage range (4.5 V ~ 5.5 V), output current capability (4 mA), and propagation delay tolerance
• Operating Temperature Range: Minimum -40°C operation required; extended range acceptable
• Compliance & Certifications: ROHS3 compliance and MSL rating maintained

The CD74HCT423M96 from Texas Instruments qualifies as a direct substitute based on matching logic family, circuit count, package type, electrical ratings, and compliance certifications. Propagation delay variance (25 ns vs. 22 ns) remains within acceptable tolerance for monostable multivibrator applications.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT423M96 serves as the primary equivalent for the 74HCT423D,112. Both devices maintain ROHS3 compliance and MSL Level 1 ratings, ensuring compatibility with modern manufacturing and storage requirements. The Texas Instruments variant provides an extended operating temperature range (-55°C to 125°C versus -40°C to 125°C), offering additional thermal margin for demanding applications. Propagation delay specification (25 ns) remains within acceptable tolerance for standard monostable multivibrator timing circuits. Pin-for-pin compatibility and identical package geometry ensure direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT423M96 replace the 74HCT423D,112 in existing designs?

A: Yes. Both devices share identical package geometry (16-SOIC), pin configuration, supply voltage requirements (4.5 V ~ 5.5 V), and output current specifications (4 mA). The 3 ns propagation delay difference (25 ns vs. 22 ns) is negligible for monostable multivibrator applications and does not affect functional compatibility.

Q: What is the significance of the extended temperature range in the CD74HCT423M96?

A: The Texas Instruments part operates from -55°C to 125°C, compared to -40°C to 125°C for the NXP device. This extended lower temperature limit provides additional operational margin for applications in extreme thermal environments, though both parts meet standard industrial temperature specifications.

Q: Are both parts RoHS compliant?

A: Yes. Both the 74HCT423D,112 and CD74HCT423M96 are ROHS3 compliant with MSL Level 1 (unlimited moisture sensitivity), meeting current environmental and regulatory requirements for electronic component manufacturing and deployment.

Q: Why are both parts classified as obsolete?

A: Obsolete status indicates these devices are no longer in active production by their respective manufacturers. However, both parts remain available through authorized distributors with documented inventory levels, supporting legacy system maintenance and repair operations.

Q: Does package type affect substitution?

A: No. Both parts use identical 16-SOIC surface mount packaging with 0.154" (3.90 mm) width. PCB footprints, reflow soldering profiles, and assembly processes remain unchanged during substitution.