CD74HC423M96G4 Equivalent & Substitute Parts

Part Overview

The CD74HC423M96G4 is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This device 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 classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD74HC423M96G4

Texas InstrumentsIn Stock: 994CD74HC423M96G4 Datasheet

Current PartRFQ

SN74AHC123ADR

Texas InstrumentsIn Stock: 5508SN74AHC123ADR Datasheet

MFR RecommendedRFQ

74HC423D,653

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HC423M96G4 is determined by the following critical parameters:

• Logic type: Monostable multivibrator with two independent circuits
• Package compatibility: 16-SOIC surface mount form factor
• Supply voltage range: Minimum 2 V to 6 V support
• Output current capability: 5.2 mA per output
• Propagation delay: Timing performance within system requirements
• RoHS and regulatory compliance: ROHS3 compliance and EAR99 classification

Two substitute parts meet these criteria with varying performance characteristics and manufacturer sources.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance and EAR99 classification, providing long-term availability compared to the obsolete CD74HC423M96G4.

The 74HC423D,653 from Nexperia USA Inc. maintains the closest electrical compatibility with the original part. It preserves the 5.2 mA output current specification, 2 V to 6 V supply voltage range, and extends the upper operating temperature to 125°C. The 20 ns propagation delay represents a 5 ns improvement over the original 25 ns specification. This part is suitable for direct replacement in applications where the original timing and current specifications are critical.

The SN74AHC123ADR from Texas Instruments offers enhanced performance with 7.5 ns propagation delay and 8 mA output current capability. However, the supply voltage range is limited to 2 V to 5.5 V, and the operating temperature range is restricted to -40°C to 85°C. This part includes Schmitt trigger inputs, which may provide additional noise immunity in certain applications. Selection of this part requires verification that the reduced voltage and temperature ranges are compatible with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHC123ADR replace the CD74HC423M96G4 in all applications?

A: The SN74AHC123ADR is electrically compatible in terms of logic function and package, but the supply voltage range is limited to 2 V to 5.5 V versus the original 2 V to 6 V. Applications requiring 6 V operation must use the 74HC423D,653 instead.

Q: What is the difference between the two substitute parts?

A: The 74HC423D,653 maintains identical output current (5.2 mA) and supply voltage range (2 V to 6 V) as the original part, with improved propagation delay (20 ns). The SN74AHC123ADR offers faster propagation delay (7.5 ns) and higher output current (8 mA) but operates at reduced voltage (2 V to 5.5 V) and temperature (-40°C to 85°C) ranges.

Q: Are both substitute parts in the same package?

A: Yes, both substitute parts use the 16-SOIC surface mount package with identical 0.154" (3.90mm) width, ensuring mechanical compatibility with the original CD74HC423M96G4.

Q: Do the substitute parts have the same RoHS compliance?

A: Yes, both substitute parts are ROHS3 compliant and carry EAR99 classification, matching the regulatory status of the original part.

Q: What is the significance of Schmitt trigger input in the SN74AHC123ADR?

A: The Schmitt trigger input in the SN74AHC123ADR provides hysteresis on the input signal, which can improve noise immunity in applications with noisy input signals. The original CD74HC423M96G4 and the 74HC423D,653 do not include this feature.

Q: Which substitute part should I choose for new designs?

A: For new designs, the 74HC423D,653 is recommended if the full 2 V to 6 V supply voltage range and -55°C to 125°C temperature range are required. The SN74AHC123ADR is suitable for applications operating within 2 V to 5.5 V and -40°C to 85°C, where the improved propagation delay and output current provide system benefits.