74ACTQ32SC OR Gate IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ32SC is a 4-channel 2-input OR gate logic IC manufactured by onsemi, housed in a 14-SOIC surface mount package. This part operates at 4.5V to 5.5V supply voltage with a maximum propagation delay of 6.5ns at 5V with 50pF load. The 74ACTQ32SC is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	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 @ V, Max CL	6.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ32SC is determined by the following critical parameters:

Logic function: 4-channel 2-input OR gate
Supply voltage range: 4.5V ~ 5.5V
Output drive capability: 24mA high and low
Input logic thresholds: 0.8V low, 2V high
Package type: 14-SOIC surface mount
Operating temperature range: -40°C ~ 85°C minimum

Substitute parts must maintain identical logic configuration, voltage specifications, and output drive characteristics. Package variations (14-SOIC vs. 14-SO) are noted where applicable. Propagation delay differences are documented but do not preclude substitution when timing margins permit.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Output Drive (H/L)	Propagation Delay @ 5V, 50pF	Operating Temp	Package	RoHS Status
74ACTQ32SC	onsemi	Obsolete	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	24mA / 24mA	6.5ns	-40°C ~ 85°C	14-SOIC	Not specified
74ACT32SC	Fairchild Semiconductor	Active	OR Gate	4 / 2	4.5V ~ 5.5V	Not specified	24mA / 24mA	Not specified	-40°C ~ 85°C	14-SOIC	Not specified
MC74ACT32DG	onsemi	Active	OR Gate	4 / 2	4.5V ~ 5.5V	4 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC74ACT32DR2G	onsemi	Active	OR Gate	4 / 2	4.5V ~ 5.5V	4 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
CD74ACT32M	Harris Corporation	Obsolete	OR Gate	4 / 2	4.5V ~ 5.5V	4 µA	24mA / 24mA	12.1ns	-55°C ~ 125°C	14-SOIC	RoHS non-compliant
CD74ACT32M96	Texas Instruments	Active	OR Gate	4 / 2	4.5V ~ 5.5V	4 µA	24mA / 24mA	12.1ns	-55°C ~ 125°C	14-SOIC	ROHS3 Compliant
SN74ACT32D	Texas Instruments	Discontinued at DiGi Electronics	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT32DG4	Texas Instruments	Discontinued at DiGi Electronics	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT32DR	Texas Instruments	Active	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
SN74ACT32NSR	Texas Instruments	Active	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	24mA / 24mA	9ns	-40°C ~ 85°C	14-SO	ROHS3 Compliant

Engineering Selection Recommendations

For active production designs, SN74ACT32DR (Texas Instruments) and MC74ACT32DG (onsemi) are preferred substitutes. Both maintain identical logic configuration and electrical specifications with active product status and ROHS3 compliance. SN74ACT32DR offers the closest electrical match with 2 µA quiescent current and 9ns propagation delay. MC74ACT32DG provides an onsemi alternative with equivalent performance.

SN74ACT32NSR is suitable for designs where 14-SO package compatibility exists, offering active status and ROHS3 compliance with identical electrical characteristics to SN74ACT32DR.

CD74ACT32M96 (Texas Instruments) extends operating temperature to -55°C to 125°C with active status and ROHS3 compliance, suitable for industrial temperature range applications. Propagation delay increases to 12.1ns; timing margin verification is required.

Obsolete parts (74ACTQ32SC, CD74ACT32M) and discontinued parts (SN74ACT32D, SN74ACT32DG4) should not be selected for new designs. 74ACT32SC (Fairchild Semiconductor) maintains active status but limited technical data availability.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT32DR directly replace 74ACTQ32SC in existing designs?

A: Yes. Both parts share identical logic configuration (4-channel 2-input OR gate), supply voltage range (4.5V ~ 5.5V), output drive capability (24mA), and operating temperature range (-40°C ~ 85°C). The 14-SOIC package is identical. Propagation delay is 9ns versus 6.5ns; timing margin verification is required if the original design operates at maximum frequency.

Q: What is the difference between MC74ACT32DG and MC74ACT32DR2G?

A: Both parts are manufactured by onsemi with identical electrical specifications. The difference is packaging: MC74ACT32DG is supplied in Tube packaging, while MC74ACT32DR2G is supplied in Cut Tape (CT) & Digi-Reel format. Electrical performance and 14-SOIC package are identical.

Q: Why does SN74ACT32NSR have a different package designation (14-SO vs. 14-SOIC)?

A: SN74ACT32NSR uses a 14-SO package with 5.30mm width, compared to the standard 14-SOIC at 3.90mm width. Both are surface mount packages with identical pin configuration and electrical specifications. PCB layout and footprint compatibility must be verified before substitution.

Q: Is CD74ACT32M96 suitable for replacement in standard -40°C to 85°C applications?

A: Yes. CD74ACT32M96 operates across -55°C to 125°C, which encompasses the standard -40°C to 85°C range. However, propagation delay increases to 12.1ns compared to 6.5ns for the original part. Timing margin analysis is required for high-frequency applications.

Q: What is the quiescent current difference between substitute parts?

A: The original 74ACTQ32SC specifies 2 µA maximum quiescent current. Most active substitutes (MC74ACT32DG, MC74ACT32DR2G, CD74ACT32M, CD74ACT32M96) specify 4 µA. Texas Instruments parts (SN74ACT32D, SN74ACT32DG4, SN74ACT32DR, SN74ACT32NSR) maintain 2 µA. For low-power applications, Texas Instruments variants are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: No. CD74ACT32M (Harris Corporation, obsolete) is RoHS non-compliant. All active substitutes are ROHS3 compliant. For new designs subject to RoHS requirements, select only ROHS3-compliant alternatives.

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