SN74LS423DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS423DG4 is a monostable multivibrator logic IC manufactured by Texas Instruments, featuring dual independent circuits with 28 ns propagation delay in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates within the standard 74LS logic family voltage range of 4.75 V to 5.25 V and is suitable for timing and pulse generation circuits requiring reliable monostable operation.

Substiute Parts

SN74LS423DG4

Texas InstrumentsIn Stock: 757SN74LS423DG4 Datasheet

Current PartRFQ

SN74LS423D

Texas InstrumentsIn Stock: 1128SN74LS423D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS423DG4 is determined by strict equivalence across the following critical parameters:

• Logic type and circuit configuration (monostable, dual independent circuits)
• Propagation delay specification (28 ns)
• Output current ratings (400µA high, 8mA low)
• Supply voltage range (4.75 V ~ 5.25 V)
• Package type and pin configuration (16-SOIC)
• Operating temperature range (0°C ~ 70°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The SN74LS423D meets all these criteria and serves as a direct equivalent. Both parts share the same base product number (74LS423) and identical electrical specifications, differing only in product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS423D is the direct equivalent for the discontinued SN74LS423DG4. Both parts are manufactured by Texas Instruments with identical electrical and mechanical specifications. The substitute part maintains active product status, ensuring continued availability and supply chain reliability. Both components meet ROHS3 compliance and REACH requirements, making them suitable for applications with environmental and regulatory compliance mandates. Selection of the SN74LS423D eliminates obsolescence risk while preserving all functional and performance characteristics of the original design.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS423D directly replace the SN74LS423DG4 in existing designs?

A: Yes. Both parts are electrically and mechanically identical, sharing the same 16-SOIC package, pin configuration, propagation delay, output current ratings, and supply voltage specifications. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The SN74LS423DG4 is discontinued at DiGi Electronics. The SN74LS423D maintains active product status and equivalent specifications, providing continued component availability.

Q: Are there any differences in compliance or certifications?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: Does the package format affect compatibility?

A: Both parts use 16-SOIC surface mount packaging with identical dimensions (0.154", 3.90mm width). Packaging format (Tube) is identical, ensuring compatibility with standard assembly processes.

Q: What parameters must remain constant for substitution validity?

A: Logic type (monostable), circuit count (dual independent), propagation delay (28 ns), output current specifications (400µA high, 8mA low), supply voltage range (4.75 V ~ 5.25 V), operating temperature (0°C ~ 70°C), and package type (16-SOIC) must all match exactly.