MC74ACT32D Equivalent & Substitute Parts

Part Overview

The MC74ACT32D is a 4-channel 2-input OR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MC74ACT32D operates within the 74ACT logic family standard, which defines compatible electrical and mechanical parameters across multiple manufacturers. Substitute parts maintain functional equivalence through matching logic configuration, electrical specifications, and package form factor.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	9ns
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Base Product Number	74ACT32

Substitute Part Grouping Explanation

Substitute parts for the MC74ACT32D are classified into three categories based on parameter alignment:

Direct Manufacturer Substitutes maintain identical electrical specifications and package form factor. These parts are interchangeable without design modification:

74ACT32SCX (Fairchild Semiconductor)
MC74ACT32DG (onsemi)

Parametric Equivalents match all critical electrical parameters but may differ in product status or packaging configuration:

74ACT32SC (Fairchild Semiconductor)
SN74ACT32D (Texas Instruments)
SN74ACT32DG4 (Texas Instruments)

Similar Parts maintain the same logic function and base product number but exhibit variations in propagation delay or operating temperature range:

CD74ACT32M (Harris Corporation)
CD74ACT32M96 (Texas Instruments)
SN74ACT32DR (Texas Instruments)
SN74ACT32NSR (Texas Instruments)

Substitution eligibility is determined by matching: logic type (OR Gate), circuit count (4 channels), input count (2 inputs per channel), supply voltage range (4.5V ~ 5.5V), output current capability (24mA), and package type (14-SOIC surface mount).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Propagation Delay @ 5V, 50pF	Operating Temperature	Package	RoHS Status
MC74ACT32D	onsemi	Obsolete	4.5V ~ 5.5V	4 µA	9ns	-40°C ~ 85°C	14-SOIC	Non-compliant
74ACT32SCX	Fairchild Semiconductor	Active	4.5V ~ 5.5V	4 µA	9ns	-40°C ~ 85°C	14-SOIC	Not specified
MC74ACT32DG	onsemi	Active	4.5V ~ 5.5V	4 µA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
74ACT32SC	Fairchild Semiconductor	Active	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
CD74ACT32M	Harris Corporation	Obsolete	4.5V ~ 5.5V	4 µA	12.1ns	-55°C ~ 125°C	14-SOIC	Non-compliant
CD74ACT32M96	Texas Instruments	Active	4.5V ~ 5.5V	4 µA	12.1ns	-55°C ~ 125°C	14-SOIC	ROHS3 Compliant
SN74ACT32DR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT32NSR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	9ns	-40°C ~ 85°C	14-SO	ROHS3 Compliant
SN74ACT32D	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT32DG4	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production Designs: MC74ACT32DG (onsemi) is the primary substitute. It maintains identical electrical specifications to the MC74ACT32D, operates within the same temperature and voltage ranges, and carries ROHS3 compliance certification. This part is currently in active production status with adequate inventory availability.

For RoHS-Compliant Applications: CD74ACT32M96 (Texas Instruments) or SN74ACT32DR (Texas Instruments) are suitable alternatives. Both parts meet ROHS3 compliance requirements. CD74ACT32M96 supports an extended operating temperature range (-55°C ~ 125°C) compared to the MC74ACT32D (-40°C ~ 85°C), making it appropriate for industrial or automotive applications requiring broader temperature tolerance. SN74ACT32DR maintains the standard temperature range with lower quiescent current (2 µA versus 4 µA).

For Direct Pin-Compatible Replacement: 74ACT32SCX (Fairchild Semiconductor) provides direct substitution with matching propagation delay (9ns) and quiescent current (4 µA). This part is in active production status.

For Extended Temperature Range Applications: CD74ACT32M96 operates across -55°C ~ 125°C, providing 40°C additional margin on both low and high temperature extremes compared to the MC74ACT32D. Propagation delay increases to 12.1ns at these specifications.

Package Consideration: SN74ACT32NSR uses a 14-SO package (0.209", 5.30mm width) rather than the standard 14-SOIC (0.154", 3.90mm width). This part is not recommended as a direct replacement without PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT32DR as a direct replacement for MC74ACT32D? A: Yes. SN74ACT32DR is electrically compatible with identical logic configuration, supply voltage range, and propagation delay. The lower quiescent current (2 µA versus 4 µA) represents improved power efficiency without functional impact. Both parts use 14-SOIC packaging.

Q: What is the difference between MC74ACT32DG and 74ACT32SCX? A: Both parts are direct substitutes with matching electrical specifications and 14-SOIC packaging. MC74ACT32DG is manufactured by onsemi and carries ROHS3 compliance. 74ACT32SCX is manufactured by Fairchild Semiconductor. Selection depends on supplier availability and procurement preferences.

Q: Why does CD74ACT32M96 have a longer propagation delay (12.1ns versus 9ns)? A: CD74ACT32M96 supports an extended operating temperature range (-55°C ~ 125°C) compared to the standard 74ACT32 specification (-40°C ~ 85°C). The increased propagation delay reflects the broader temperature tolerance. This part is suitable for applications requiring industrial or automotive temperature ratings.

Q: Is SN74ACT32NSR compatible with MC74ACT32D? A: SN74ACT32NSR is electrically equivalent but uses a 14-SO package (0.209" width) instead of the 14-SOIC package (0.154" width) used by MC74ACT32D. PCB layout modification is required for physical compatibility. This substitution is not recommended without design revision.

Q: Which substitute part has the best RoHS compliance status? A: MC74ACT32DG, CD74ACT32M96, SN74ACT32DR, SN74ACT32NSR, SN74ACT32D, and SN74ACT32DG4 all carry ROHS3 compliance certification. The MC74ACT32D original part is RoHS non-compliant.

Q: Can I use 74ACT32SC as a substitute? A: 74ACT32SC is listed as a parametric equivalent but lacks complete electrical specification data in available documentation. This part is in active production status. Verification of full electrical parameters with the manufacturer is recommended before design implementation.

Q: What is the inventory status of substitute parts? A: MC74ACT32DG (2,356 pcs), 74ACT32SCX (48,707 pcs), CD74ACT32M96 (2,900 pcs), SN74ACT32DR (7,144 pcs), and SN74ACT32NSR (756 pcs) are currently in stock. Availability should be confirmed with suppliers for production quantities.

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