MM74HC423AN Equivalent & Substitute Parts

Part Overview

The MM74HC423AN is a monostable multivibrator logic IC manufactured by onsemi, featuring dual independent circuits with Schmitt trigger input capability. This 16-pin DIP package device operates across a 2V to 6V supply range with a 22 ns propagation delay and is classified as obsolete. Due to its obsolete status and limited current availability, identifying functionally compatible substitute components is essential for design continuity and procurement planning.

Substiute Parts

MM74HC423AN

onsemiIn Stock: 1044MM74HC423AN Datasheet

Current PartRFQ

CD74HC423E

Harris CorporationIn Stock: 15736CD74HC423E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the MM74HC423AN is determined by the following critical parameters:

• Logic Function: Monostable multivibrator with dual independent circuits
• Package Type: 16-DIP (0.300", 7.62mm) through-hole mounting
• Supply Voltage Range: 2 V ~ 6 V operation
• Output Current Capability: 5.2 mA high and low
• Base Product Series: 74HC423 logic family

The CD74HC423E qualifies as a functional substitute based on matching logic type, package configuration, supply voltage range, and output current specifications. Both devices share the same base product number (74HC423) and are pin-compatible 16-PDIP packages suitable for through-hole assembly.

Parameter Comparison

Engineering Selection Recommendations

Both the MM74HC423AN and CD74HC423E are classified as obsolete components. The CD74HC423E presents the following characteristics for selection consideration:

Propagation Delay Difference: The CD74HC423E specifies 25 ns propagation delay compared to 22 ns for the MM74HC423AN. This 3 ns variance falls within typical logic circuit tolerances for most applications but should be verified against specific timing-critical requirements.

Operating Temperature Range: The CD74HC423E supports -55°C to 125°C operation, exceeding the MM74HC423AN range of -40°C to 85°C. This extended range provides greater flexibility for applications requiring wider temperature performance.

Schmitt Trigger Input: The MM74HC423AN includes Schmitt trigger input capability, while the CD74HC423E does not. Applications dependent on Schmitt trigger hysteresis characteristics must account for this functional difference.

Compliance Status: The CD74HC423E is RoHS non-compliant. Applications subject to RoHS requirements should evaluate compliance implications before selection.

Both devices share identical supply voltage ranges, output current specifications, package configurations, and pin compatibility, supporting direct substitution in through-hole PCB applications.

Frequently Asked Questions (FAQ)

Q: Are MM74HC423AN and CD74HC423E pin-compatible?

A: Yes. Both devices use the 16-PDIP package with identical pin assignments and are mechanically and electrically compatible for through-hole mounting applications.

Q: What is the significance of the 3 ns propagation delay difference?

A: The CD74HC423E specifies 25 ns propagation delay versus 22 ns for the MM74HC423AN. This difference is acceptable for general-purpose monostable multivibrator applications. Applications with timing-critical requirements below 25 ns should verify compatibility with actual circuit specifications.

Q: Can I use CD74HC423E in place of MM74HC423AN in all applications?

A: Substitution is suitable for most applications sharing the same supply voltage (2V to 6V) and output current requirements (5.2 mA). However, applications specifically requiring Schmitt trigger input functionality must use the MM74HC423AN, as the CD74HC423E does not include this feature.

Q: What is the impact of the extended operating temperature range in CD74HC423E?

A: The CD74HC423E supports -55°C to 125°C operation compared to -40°C to 85°C for the MM74HC423AN. This extended range allows use in wider environmental conditions. Applications operating within the MM74HC423AN range experience no functional difference.

Q: Are there RoHS compliance considerations?

A: The CD74HC423E is RoHS non-compliant. Applications subject to RoHS directives or customer requirements must evaluate compliance implications. The MM74HC423AN status is REACH Unaffected.

Q: What packaging options are available?

A: Both devices are supplied in 16-DIP (0.300", 7.62mm) through-hole packages. The MM74HC423AN is available in standard packaging, while the CD74HC423E is supplied in tube packaging. Both are suitable for through-hole PCB assembly.