74HC423N,652 Equivalent & Substitute Parts

Part Overview

The 74HC423N,652 is a monostable multivibrator logic integrated circuit manufactured by NXP USA Inc. in a 16-DIP through-hole package. This device 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 components necessary for ongoing system maintenance, repairs, and legacy product support.

Substiute Parts

74HC423N,652

NXP USA Inc.In Stock: 77474HC423N,652 Datasheet

Current PartRFQ

CD74HC423E

Harris CorporationIn Stock: 15736CD74HC423E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC423N,652 is determined by the following critical parameters:

• Logic Function: Both parts must be monostable multivibrators with two independent circuits
• Package Type: 16-DIP through-hole package with 0.300" (7.62 mm) pitch
• Electrical Compatibility: Supply voltage range, output current ratings, and propagation delay must be compatible with the original circuit design
• Operating Temperature Range: Must support the required thermal environment
• Series Compatibility: Both parts belong to the 74HC logic family

The CD74HC423E qualifies as a substitute based on matching logic function, package type, circuit count, output current specifications, and supply voltage range. Propagation delay and temperature range variations are within acceptable engineering tolerances for monostable multivibrator applications.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC423E serves as a direct functional substitute for the 74HC423N,652 in applications requiring monostable multivibrator logic with two independent circuits in a 16-DIP package. Both devices share identical output current specifications and supply voltage requirements, ensuring electrical compatibility in existing circuit designs.

The CD74HC423E offers an extended lower operating temperature limit (-55°C versus -40°C), providing broader thermal coverage for applications requiring enhanced cold-temperature performance. The 5 ns increase in propagation delay (25 ns versus 20 ns) remains within typical timing tolerances for monostable multivibrator circuits and does not impact functional compatibility.

RoHS compliance status differs between the two parts. The 74HC423N,652 is ROHS3 compliant, while the CD74HC423E is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements. Both parts are classified as obsolete, indicating limited availability through standard distribution channels.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC423E directly replace the 74HC423N,652 in existing circuit boards?

A: Yes. Both devices are 16-DIP through-hole packages with identical pinouts, output current ratings, and supply voltage specifications. Direct socket substitution is possible without circuit modification.

Q: What is the significance of the 5 ns propagation delay difference?

A: The CD74HC423E has a 25 ns propagation delay compared to the 74HC423N,652 at 20 ns. For monostable multivibrator applications, this difference is typically absorbed within circuit timing margins and does not affect functional operation in standard applications.

Q: Does the extended temperature range of the CD74HC423E provide an advantage?

A: The CD74HC423E operates from -55°C to 125°C, compared to -40°C to 125°C for the 74HC423N,652. This extended lower temperature limit is beneficial for applications deployed in cold environments or requiring enhanced thermal margin.

Q: Are there RoHS compliance implications when substituting these parts?

A: Yes. The 74HC423N,652 is ROHS3 compliant, while the CD74HC423E is RoHS non-compliant. Applications subject to RoHS regulations must use the 74HC423N,652 or identify alternative compliant substitutes.

Q: What is the availability status of these parts?

A: Both the 74HC423N,652 and CD74HC423E are classified as obsolete products. Availability through standard distribution channels is limited. Inventory levels should be verified with component suppliers before design decisions.

Q: Are there any circuit design considerations when using the CD74HC423E as a substitute?

A: No circuit redesign is required. The identical package type, pinout, output current specifications, and supply voltage range ensure drop-in compatibility. Timing-critical applications should account for the 5 ns propagation delay difference in system-level analysis.