MM74HC123AMTC Equivalent & Substitute Parts

Part Overview

The MM74HC123AMTC is a monostable multivibrator logic IC manufactured by onsemi, housed in a 16-TSSOP surface mount package. This component features dual independent circuits with Schmitt trigger inputs and a propagation delay of 22 ns. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

MM74HC123AMTC

onsemiIn Stock: 1044MM74HC123AMTC Datasheet

Current PartRFQ

74VHC123AMTC

onsemiIn Stock: 145474VHC123AMTC Datasheet

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74HC123PW,112

Nexperia USA Inc.In Stock: 94074HC123PW,112 Datasheet

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74HC123PW,118

Nexperia USA Inc.In Stock: 890874HC123PW,118 Datasheet

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CD74HC123PWR

Texas InstrumentsIn Stock: 50164CD74HC123PWR Datasheet

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CD74HC123PWT

Texas InstrumentsIn Stock: 1019CD74HC123PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MM74HC123AMTC is determined by the following critical parameters:

Functional Compatibility Requirements:

• Logic type: Monostable multivibrator
• Independent circuits: 2
• Package / Case: 16-TSSOP surface mount
• Supply voltage range: Must encompass or match 2 V to 6 V
• Operating temperature range: Must support -40°C to 85°C minimum

Performance Considerations:

• Propagation delay: 22 ns (baseline); faster alternatives acceptable
• Output current capability: 5.2 mA minimum (high and low)
• Schmitt trigger input: Present in main part; absence acceptable in substitutes

Substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Functional Equivalents (74HC Series) Parts maintaining the 74HC base product number with identical or superior electrical characteristics within the same package.

Category 2: Enhanced Performance Alternatives (74VHC Series) Parts offering improved propagation delay and output current while maintaining functional compatibility and package form factor.

Parameter Comparison

Engineering Selection Recommendations

For Active Production (Recommended Primary Choice): CD74HC123PWR (Texas Instruments) is the preferred substitute. This part maintains full functional compatibility with the MM74HC123AMTC, offers active product status with established supply chain availability, and provides ROHS3 compliance. The 25 ns propagation delay is marginally faster than the original 22 ns specification, presenting no functional degradation. Operating temperature range extends to -55°C to 125°C, exceeding the original -40°C to 85°C requirement.

For Extended Temperature Applications: CD74HC123PWR and CD74HC123PWT both support -55°C to 125°C operating range, suitable for applications requiring broader thermal performance than the original specification.

For Active Product Status with Standard Temperature Range: 74HC123PW,118 (Nexperia USA Inc.) maintains active product status and provides 8,886 pieces in inventory. This part operates within -40°C to 125°C and is supplied in Tape & Reel packaging. Note that Schmitt trigger input is not present in this variant.

For Enhanced Performance Requirements: 74VHC123AMTC (onsemi) delivers superior propagation delay of 8.1 ns and increased output current of 8 mA per channel. This part is suitable for timing-critical applications where faster response is beneficial. Supply voltage range is 2 V to 5.5 V, which is compatible with the original 2 V to 6 V specification for most standard logic voltage levels.

Parts to Avoid for New Designs: MM74HC123AMTC, 74HC123PW,112, and CD74HC123PWT carry obsolete or discontinued status and should not be selected for new production designs.

Frequently Asked Questions (FAQ)

Q: Can I use 74HC123PW,118 as a direct replacement for MM74HC123AMTC? A: Functionally, yes. Both are monostable multivibrators with 2 independent circuits in 16-TSSOP packages. The 74HC123PW,118 operates within compatible voltage and temperature ranges. The absence of Schmitt trigger input in the 74HC123PW,118 is acceptable if your circuit does not depend on this feature for noise immunity on the input signal.

Q: What is the difference between 74HC123 and 74VHC123 series? A: The 74VHC123 series offers faster propagation delay (8.1 ns versus 22 ns) and higher output current (8 mA versus 5.2 mA). The 74VHC123 supply voltage range is 2 V to 5.5 V, slightly narrower than the 74HC123 range of 2 V to 6 V. Both maintain the same 16-TSSOP package and dual independent circuit configuration.

Q: Is the 16-TSSOP package identical across all substitute parts? A: Yes. All listed substitute parts use the 16-TSSOP (0.173", 4.40 mm width) surface mount package, ensuring mechanical and electrical compatibility on the PCB.

Q: Which substitute part has the best long-term availability? A: CD74HC123PWR (Texas Instruments) is recommended for long-term availability due to active product status and high inventory levels (50,084 pieces). 74HC123PW,118 (Nexperia USA Inc.) also maintains active status with substantial inventory (8,886 pieces).

Q: Can I use CD74HC123PWT instead of CD74HC123PWR? A: Both parts are electrically identical with the same propagation delay (25 ns), output current (5.2 mA), and operating specifications. CD74HC123PWT is discontinued at DiGi Electronics, making CD74HC123PWR the preferred choice for new procurement.

Q: Does the propagation delay difference affect circuit timing? A: Propagation delay differences between substitutes (ranging from 8.1 ns to 65 ns) may affect circuit timing if your design relies on precise pulse width or frequency generation. Verify that the selected substitute's propagation delay is acceptable for your specific timing requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements for modern electronics manufacturing.