74VHC123AMX Equivalent & Substitute Parts

Part Overview

The 74VHC123AMX is a monostable multivibrator logic IC manufactured by onsemi, supplied in 16-SOIC surface mount packaging. This device features dual independent circuits with Schmitt trigger inputs, operating across a 2V to 5.5V supply range with 8.1 ns propagation delay. The part is currently active in production and ROHS3 compliant. Substitute parts are necessary when the original part becomes unavailable, when alternative packaging formats are required, or when enhanced operating temperature ranges are needed for specific applications.

Substiute Parts

74VHC123AMX

onsemiIn Stock: 375774VHC123AMX Datasheet

Current PartRFQ

SN74AHC123AD

Texas InstrumentsIn Stock: 1948SN74AHC123AD Datasheet

DirectRFQ

SN74AHC123ADR

Texas InstrumentsIn Stock: 5508SN74AHC123ADR Datasheet

DirectRFQ

SN74AHC123AMDREP

Texas InstrumentsIn Stock: 3309SN74AHC123AMDREP Datasheet

UpgradeRFQ

74AHC123AD,118

Nexperia USA Inc.In Stock: 681274AHC123AD,118 Datasheet

SimilarRFQ

74AHC123AD-Q100J

Nexperia USA Inc.In Stock: 337574AHC123AD-Q100J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHC123AMX is determined by the following critical parameters: logic type (monostable multivibrator), independent circuit count (2), supply voltage range (2V ~ 5.5V), output current capability (8mA minimum), package type (16-SOIC), and mounting method (surface mount). All substitute parts listed maintain these core electrical and mechanical specifications.

Substitute parts are categorized as follows:

Direct Substitutes maintain identical or superior propagation delay performance, identical Schmitt trigger input configuration, and identical package specifications. These parts are pin-compatible and functionally equivalent.

Upgrade Substitutes offer extended operating temperature ranges (-55°C ~ 125°C versus -40°C ~ 85°C) while maintaining all other electrical parameters, providing enhanced reliability for demanding thermal environments.

Similar Substitutes maintain core functionality and package compatibility but feature faster propagation delay (5.1 ns versus 8.1 ns) and may differ in Schmitt trigger input configuration or operating temperature range. These parts are functionally compatible but with performance variations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Active Product Status: SN74AHC123ADR (Texas Instruments) is the primary recommendation. This part maintains identical electrical specifications to the 74VHC123AMX, including 7.5 ns propagation delay, dual Schmitt trigger inputs, and -40°C to 85°C operating range. The part is currently active in production and available in Cut Tape and Digi-Reel packaging formats. Both the main part and substitute are ROHS3 compliant with identical moisture sensitivity levels.

For Extended Temperature Range Applications: SN74AHC123AMDREP (Texas Instruments) provides an upgrade path with extended operating temperature range of -55°C to 125°C while maintaining all other electrical parameters. This part is supplied in Tape & Reel packaging, matching the original part's packaging format. Product status is active.

For High-Speed Applications: 74AHC123AD,118 and 74AHC123AD-Q100J (Nexperia USA Inc.) offer faster propagation delay of 5.1 ns. Both parts support extended operating temperature to 125°C. The 74AHC123AD-Q100J includes AEC-Q100 automotive qualification. Note that these parts do not include Schmitt trigger inputs, which may affect circuit behavior in noise-sensitive applications.

Avoid: SN74AHC123AD (Texas Instruments) is discontinued at DiGi Electronics and should not be selected for new designs despite active status at other distributors.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AHC123ADR as a direct replacement for 74VHC123AMX? A: Yes. Both parts are 16-SOIC surface mount packages with identical pin configurations, dual independent monostable circuits, Schmitt trigger inputs, 8mA output current, and 2V to 5.5V supply voltage range. Propagation delay differs by 0.6 ns (7.5 ns versus 8.1 ns), which is within typical circuit tolerance margins.

Q: What is the difference between the Texas Instruments and Nexperia substitute options? A: Texas Instruments SN74AHC123ADR and SN74AHC123AMDREP maintain Schmitt trigger inputs identical to the original part. Nexperia parts (74AHC123AD,118 and 74AHC123AD-Q100J) do not include Schmitt trigger inputs but offer faster propagation delay (5.1 ns) and extended temperature range to 125°C. Selection depends on whether Schmitt trigger functionality is required in your circuit.

Q: Why should I choose SN74AHC123AMDREP over SN74AHC123ADR? A: SN74AHC123AMDREP extends the operating temperature range to -55°C to 125°C, compared to -40°C to 85°C for SN74AHC123ADR. This upgrade is necessary for applications requiring operation in extreme thermal environments or military-grade specifications. Both parts are active and ROHS3 compliant.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and moisture sensitivity level 1 (unlimited), matching the original 74VHC123AMX specifications.

Q: What packaging formats are available for substitutes? A: SN74AHC123ADR is supplied in Cut Tape and Digi-Reel format. SN74AHC123AMDREP is supplied in Tape & Reel format, matching the original part. Nexperia parts are supplied in Tape & Reel format. SN74AHC123AD is supplied in Tube format but is discontinued at DiGi Electronics.

Q: Can I use the Nexperia parts if Schmitt trigger input is not required in my application? A: Yes. If your circuit does not depend on Schmitt trigger input hysteresis, the Nexperia 74AHC123AD,118 or 74AHC123AD-Q100J provide faster propagation delay and extended temperature range. Verify that the absence of Schmitt trigger input does not affect noise immunity or signal integrity in your specific application.