74VHC123AMTC Equivalent & Substitute Parts

Part Overview

The 74VHC123AMTC is a monostable multivibrator logic IC manufactured by onsemi, featuring dual independent circuits with Schmitt trigger inputs and 8.1 ns propagation delay. This component is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring monostable multivibrator functionality in the 74-series logic family.

Substiute Parts

74VHC123AMTC

onsemiIn Stock: 145474VHC123AMTC Datasheet

Current PartRFQ

74VHC123AMTCX

onsemiIn Stock: 2978874VHC123AMTCX Datasheet

MFR RecommendedRFQ

SN74AHC123APWR

Texas InstrumentsIn Stock: 3441SN74AHC123APWR Datasheet

DirectRFQ

SN74AHC123APWRG4

Texas InstrumentsIn Stock: 10231SN74AHC123APWRG4 Datasheet

DirectRFQ

74AHC123APW,118

Nexperia USA Inc.In Stock: 638374AHC123APW,118 Datasheet

UpgradeRFQ

SN74AHC123ADBR

Texas InstrumentsIn Stock: 3095SN74AHC123ADBR Datasheet

SimilarRFQ

SN74AHC123ADGVR

Texas InstrumentsIn Stock: 3159SN74AHC123ADGVR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74VHC123AMTC is determined by the following critical parameters: logic type (monostable multivibrator), independent circuit count (2), supply voltage range (2 V ~ 5.5 V), output current capability (8 mA), and package compatibility. The substitute parts are grouped into four categories based on their relationship to the main part:

MFR Recommended Substitute: Parts with identical electrical specifications and the same base product number (74VHC123), differing only in packaging format or product status.

Direct Manufacturer Substitutes: Parts from alternative manufacturers (Texas Instruments, Nexperia) with the same base functionality (74AHC123 series) and compatible electrical parameters, though propagation delay and operating temperature may vary within acceptable ranges.

Upgrade Options: Parts offering improved performance characteristics (faster propagation delay, extended temperature range) while maintaining functional compatibility and the same package footprint.

Similar Parts: Components with compatible electrical specifications but different package types, suitable for applications where package footprint flexibility exists.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 74VHC123AMTCX (onsemi) is the preferred direct substitute. It maintains identical electrical specifications and package format while offering Active product status, ensuring long-term availability and supply chain stability compared to the Last Time Buy status of the original part.

Secondary Recommendation: SN74AHC123APWR (Texas Instruments) provides a functionally compatible alternative with improved propagation delay (7.5 ns versus 8.1 ns), maintaining Schmitt trigger input functionality and identical package footprint. Active product status ensures continued availability.

Performance Upgrade Option: 74AHC123APW,118 (Nexperia USA Inc.) offers the fastest propagation delay (5.1 ns) and extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring enhanced performance margins. Note that Schmitt trigger input is not available on this variant.

Package Variant Alternatives: SN74AHC123ADBR (16-SSOP) and SN74AHC123ADGVR (16-TVSOP) provide electrical compatibility with different package footprints. These are suitable only for designs with flexible PCB layout requirements or where alternative package types are acceptable.

Compliance Status: All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1, and REACH Unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74VHC123AMTC with 74VHC123AMTCX without design changes?

A: Yes. The 74VHC123AMTCX is a direct equivalent with identical electrical specifications, propagation delay, and 16-TSSOP package footprint. No circuit modifications are required.

Q: What is the difference between 74VHC123AMTC and SN74AHC123APWR?

A: Both are monostable multivibrators with identical supply voltage range, output current, and operating temperature. The primary difference is propagation delay: 8.1 ns (onsemi 74VHC) versus 7.5 ns (Texas Instruments 74AHC). The faster propagation delay of the Texas Instruments part may improve timing performance in delay-sensitive applications. Both use identical 16-TSSOP packaging.

Q: Why does 74AHC123APW,118 lack Schmitt trigger input?

A: This is a design characteristic of the Nexperia variant. Applications requiring Schmitt trigger input hysteresis should use 74VHC123AMTCX or SN74AHC123APWR instead.

Q: Can I use SN74AHC123ADBR (16-SSOP) as a substitute?

A: Electrical substitution is possible, but the 16-SSOP package has a different footprint (0.209", 5.30mm width) compared to the original 16-TSSOP (0.173", 4.40mm width). PCB layout modification is required. Use only if package flexibility exists in your design.

Q: Is SN74AHC123APWRG4 still available?

A: This part is listed as Discontinued at DiGi Electronics. While inventory may exist through other channels, 74VHC123AMTCX or SN74AHC123APWR are recommended for new designs to ensure long-term supply availability.

Q: What is the temperature range difference between 74AHC123APW,118 and other substitutes?

A: The Nexperia part operates from -40°C to 125°C, providing 40°C additional upper temperature margin compared to the onsemi and Texas Instruments variants (-40°C to 85°C). This extended range is beneficial for high-temperature applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1, ensuring regulatory alignment with the original 74VHC123AMTC component.