74HC123N,652 Equivalent & Substitute Parts

Part Overview

The 74HC123N,652 is a monostable multivibrator logic IC manufactured by NXP Semiconductors in a 16-DIP package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement. The 74HC series represents a standard logic family with established pin compatibility across multiple manufacturers, enabling direct substitution where electrical and mechanical parameters align.

Substiute Parts

74HC123N,652

NXP SemiconductorsIn Stock: 93674HC123N,652 Datasheet

Current PartRFQ

CD74HC123E

Texas InstrumentsIn Stock: 20096CD74HC123E Datasheet

DirectRFQ

TC74HC123APNEWF

Toshiba Semiconductor and StorageIn Stock: 1593TC74HC123APNEWF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC123N,652 is determined by the following critical parameters:

• Logic Type & Circuit Count: All candidates must be monostable multivibrators with 2 independent circuits
• Package Compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting is mandatory for direct PCB replacement
• Supply Voltage Range: Must support 2 V ~ 6 V operation
• Output Current: Must meet or exceed 5.2 mA for both high and low states
• Compliance: ROHS3 compliance and EAR99 classification required

The identified substitutes—CD74HC123E (Texas Instruments) and TC74HC123APNEWF (Toshiba Semiconductor and Storage)—satisfy all mandatory compatibility criteria. Propagation delay variations (25 ns and 16 ns respectively) represent performance improvements over the original 65 ns specification and do not preclude substitution in standard timing-tolerant applications.

Parameter Comparison

Engineering Selection Recommendations

TC74HC123APNEWF (Toshiba) is the preferred substitute due to active product status, ensuring long-term availability and manufacturing support. This part delivers superior propagation delay performance (16 ns) and includes Schmitt trigger input functionality, providing enhanced noise immunity in industrial environments. ROHS3 compliance and EAR99 classification align with regulatory requirements.

CD74HC123E (Texas Instruments) serves as a secondary alternative with intermediate propagation delay (25 ns) and extended low-temperature operating range (-55°C). While classified as obsolete, current inventory levels (20,040 units) support near-term procurement. This option remains suitable for applications where the extended temperature range provides operational advantage.

Both substitutes maintain electrical and mechanical compatibility with the original 74HC123N,652 specification, supporting direct PCB replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC123E or TC74HC123APNEWF be used as direct replacements for the 74HC123N,652?

A: Yes. Both parts share identical package geometry (16-DIP), pin configuration, supply voltage range (2 V ~ 6 V), and output current specifications (5.2 mA). They are functionally equivalent monostable multivibrators with 2 independent circuits and require no circuit redesign for substitution.

Q: What is the significance of the propagation delay differences?

A: The original 74HC123N,652 specifies 65 ns propagation delay. The CD74HC123E (25 ns) and TC74HC123APNEWF (16 ns) offer faster switching performance. In timing-critical applications, faster propagation delay may require circuit validation to ensure compatibility with existing timing margins. In non-critical applications, faster performance presents no substitution barrier.

Q: Why is TC74HC123APNEWF recommended over CD74HC123E?

A: TC74HC123APNEWF maintains active product status, ensuring ongoing manufacturing and supply chain support. It also incorporates Schmitt trigger input functionality, providing superior noise rejection compared to the standard input configuration of CD74HC123E. Both are ROHS3 compliant and suitable for substitution.

Q: Are there package or mounting differences between these parts?

A: No. All three parts—74HC123N,652, CD74HC123E, and TC74HC123APNEWF—use identical 16-DIP (0.300", 7.62mm) through-hole packaging. Direct PCB replacement is supported without modification to footprint or assembly procedures.

Q: What is the operating temperature range consideration for substitution?

A: The original part operates -40°C ~ 125°C. CD74HC123E extends the low-temperature range to -55°C, while TC74HC123APNEWF maintains -40°C ~ 85°C. Selection depends on application temperature requirements. For standard industrial range (-40°C ~ 85°C), TC74HC123APNEWF is sufficient. For extended low-temperature operation, CD74HC123E provides additional margin.

Q: Are all substitutes ROHS3 compliant?

A: Yes. The 74HC123N,652, CD74HC123E, and TC74HC123APNEWF are all ROHS3 compliant and classified as EAR99 for export control purposes, meeting current regulatory requirements for electronic component procurement.