CD74HCT123M Equivalent & Substitute Parts

Part Overview

The CD74HCT123M is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates as a dual independent monostable circuit with 25 ns propagation delay, suitable for timing and pulse generation in digital systems.

Substiute Parts

CD74HCT123M

Texas InstrumentsIn Stock: 1778CD74HCT123M Datasheet

Current PartRFQ

CD74HCT123M96

Texas InstrumentsIn Stock: 15478CD74HCT123M96 Datasheet

DirectRFQ

74HCT123D,653

NXP SemiconductorsIn Stock: 3673574HCT123D,653 Datasheet

MFR RecommendedRFQ

74HCT4040D,652

NXP SemiconductorsIn Stock: 1061274HCT4040D,652 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HCT123M is determined by the following critical parameters:

• Logic Function: Monostable multivibrator with dual independent circuits
• Propagation Delay: 25 ns maximum
• Output Drive Capability: 4 mA source and sink current
• Supply Voltage Compatibility: 4.5 V to 5.5 V operation
• Package Compatibility: 16-SOIC surface mount form factor
• Temperature Range: -55°C to 125°C operation
• Compliance Requirements: ROHS3 compliance and MSL Level 1

The identified substitutes maintain electrical equivalence across these parameters while offering different packaging options or manufacturer sources. The CD74HCT123M96 variant from Texas Instruments provides identical electrical specifications with alternative packaging (Cut Tape & Digi-Reel). The 74HCT123D,653 from NXP Semiconductors represents a cross-manufacturer equivalent with active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74HCT123M96

The CD74HCT123M96 is the direct equivalent from Texas Instruments, maintaining identical electrical specifications and package form factor. This part is available in Cut Tape and Digi-Reel packaging with higher inventory availability (15,407 units). Selection of this variant is appropriate when maintaining the original manufacturer source is preferred.

Cross-Manufacturer Substitute: 74HCT123D,653

The 74HCT123D,653 from NXP Semiconductors is an active product with confirmed monostable multivibrator functionality and dual independent circuits. This part carries active product status and ROHS3 compliance. Inventory availability is substantial (36,703 units). This substitute is suitable for applications where cross-manufacturer sourcing is acceptable and long-term availability is prioritized.

Note on 74HCT4040D,652

The 74HCT4040D,652 is a binary counter IC with different logic function (counter element vs. monostable multivibrator). This part is not functionally equivalent and should not be selected as a substitute for monostable timing applications.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT123M96 be used as a direct replacement for CD74HCT123M?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, including 25 ns propagation delay, 4 mA output current, 4.5 V to 5.5 V supply voltage range, and 16-SOIC package. The difference is packaging format (Tube vs. Cut Tape & Digi-Reel).

Q: Is the 74HCT123D,653 from NXP Semiconductors pin-compatible with the CD74HCT123M?

A: Pin compatibility is confirmed through the shared 16-SOIC package and identical monostable multivibrator function with dual independent circuits. Both parts operate within the same supply voltage and temperature ranges.

Q: What is the difference between the CD74HCT123M and CD74HCT123M96?

A: Both parts are electrically identical monostable multivibrators from Texas Instruments. The primary difference is packaging: CD74HCT123M is supplied in Tube format, while CD74HCT123M96 is supplied in Cut Tape and Digi-Reel format.

Q: Why is 74HCT4040D,652 listed as a substitute if it is not functionally equivalent?

A: The 74HCT4040D,652 is a binary counter IC with different logic function. It is not suitable for monostable multivibrator applications and should not be selected as a substitute.

Q: Are all substitute parts ROHS3 compliant?

A: CD74HCT123M, CD74HCT123M96, 74HCT123D,653, and 74HCT4040D,652 all carry ROHS3 compliance certification and MSL Level 1 rating.

Q: What is the inventory status of available substitutes?

A: CD74HCT123M96 has 15,407 units in stock. The 74HCT123D,653 has 36,703 units in stock. Both represent active inventory for immediate procurement.