SN74ACT32D Equivalent & Substitute Parts

Part Overview

The SN74ACT32D is a 4-channel 2-input OR gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The 74ACT32 logic family provides standard OR gate functionality across multiple manufacturers and packaging options, enabling direct functional replacement in circuit designs.

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)	2 µA
Current - Output High/Low	24mA / 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay	9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74ACT32D is determined by strict equivalence across the following parameters: logic type (OR gate), number of circuits (4), number of inputs per circuit (2), supply voltage range (4.5V ~ 5.5V), output current capability (24mA), input logic thresholds (0.8V low / 2V high), propagation delay (9ns @ 5V, 50pF), operating temperature range (-40°C ~ 85°C), and package type (14-SOIC surface mount).

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging, differing only in manufacturer or tape/reel packaging format.

Manufacturer Recommended Substitutes are designated by the original manufacturer as approved alternatives with equivalent functional performance.

Parametric Equivalents meet all critical electrical and mechanical parameters but may originate from different manufacturers within the 74ACT32 logic family.

Parameter Comparison

Part Number	Manufacturer	Product Status	Quiescent Current (Max)	Packaging	Package / Case	RoHS Status	Inventory
SN74ACT32D	Texas Instruments	Discontinued at DiGi Electronics	2 µA	Tube	14-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant	3840 Pcs
SN74ACT32DR	Texas Instruments	Active	2 µA	Cut Tape (CT) & Digi-Reel®	14-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant	7144 Pcs
MC74ACT32DR2G	onsemi	Active	4 µA	Cut Tape (CT) & Digi-Reel®	14-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant	1698 Pcs
74ACT32SCX	Fairchild Semiconductor	Active	4 µA	Not specified	14-SOIC (0.154", 3.90mm Width)	Not specified	48707 Pcs
74ACT32SC	Fairchild Semiconductor	Active	Not specified	Not specified	Not specified	Not specified	2800 Pcs
MC74ACT32DG	onsemi	Active	4 µA	Tube	14-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant	2356 Pcs
SN74ACT32DG4	Texas Instruments	Discontinued at DiGi Electronics	2 µA	Not specified	14-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant	846 Pcs

Engineering Selection Recommendations

Primary Substitute: SN74ACT32DR (Texas Instruments)

The SN74ACT32DR is the direct active equivalent from the original manufacturer. It maintains identical electrical specifications including 2 µA quiescent current and is ROHS3 compliant. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube), which does not affect functional performance. This part has the highest inventory availability at 7144 units.

Secondary Substitutes: MC74ACT32DR2G and MC74ACT32DG (onsemi)

Both onsemi parts meet all critical electrical and mechanical parameters with 14-SOIC packaging and ROHS3 compliance. The quiescent current specification is 4 µA (versus 2 µA in the original), which remains within acceptable operating margins for OR gate logic applications. MC74ACT32DG is available in Tube packaging matching the original format.

Alternative Substitute: 74ACT32SCX (Fairchild Semiconductor)

The 74ACT32SCX is manufacturer-recommended and maintains full electrical equivalence with 14-SOIC packaging. It offers the highest inventory availability at 48707 units. Quiescent current is specified at 4 µA.

Not Recommended: 74ACT32SC

Insufficient parameter data provided for this part number. Use only when other substitutes are unavailable and full datasheet verification is completed.

Not Recommended: SN74ACT32DG4

This Texas Instruments part is also discontinued at DiGi Electronics, making it unsuitable as a replacement for the discontinued SN74ACT32D.

Frequently Asked Questions (FAQ)

Q: Can I use MC74ACT32DR2G or MC74ACT32DG as direct replacements for SN74ACT32D?

A: Yes. Both onsemi parts are parametric equivalents meeting all critical specifications: 4-channel 2-input OR gate logic, 14-SOIC package, 4.5V ~ 5.5V supply voltage, 24mA output current, and -40°C ~ 85°C operating temperature. The 4 µA quiescent current specification (versus 2 µA in the original) does not affect functional compatibility in standard logic applications.

Q: What is the difference between SN74ACT32D and SN74ACT32DR?

A: Both are Texas Instruments 74ACT32 OR gate ICs with identical electrical specifications. The difference is packaging format: SN74ACT32D is supplied in Tube packaging, while SN74ACT32DR is supplied in Cut Tape & Digi-Reel® format. Functional performance is identical.

Q: Is the 14-SOIC package the same across all substitute parts?

A: Yes. All substitute parts listed use the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility on PCBs designed for the original SN74ACT32D.

Q: Are all substitute parts RoHS compliant?

A: The primary substitutes (SN74ACT32DR, MC74ACT32DR2G, MC74ACT32DG, and 74ACT32SCX) are ROHS3 compliant. The 74ACT32SC does not have RoHS status specified in available data.

Q: Which substitute has the best inventory availability?

A: The 74ACT32SCX from Fairchild Semiconductor has the highest inventory at 48707 units. The SN74ACT32DR from Texas Instruments has 7144 units available.

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