74ACTQ245SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ245SC is a non-inverting transceiver logic IC manufactured by onsemi, designed for 8-bit bidirectional data transmission with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The 74ACTQ245SC is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain identical functional specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ245SC is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Mounting Type: Surface Mount
Supplier Device Package: 20-SOIC or 20-SO

Substitute parts are grouped into two categories based on operating temperature range and package specifications. All listed substitutes maintain identical logic functionality, output drive capability, and supply voltage requirements. Package variations (20-SOIC vs. 20-SO) represent mechanical alternatives with compatible pinout configurations.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Operating Temperature	Package / Case	Voltage - Supply	Current - Output (High, Low)	MSL	RoHS Status
74ACTQ245SC	onsemi	Obsolete	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	1 (Unlimited)	REACH Unaffected
74ACT245SC	onsemi	Active	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	3 (168 Hours)	ROHS3 Compliant
MC74ACT245DWR2G	onsemi	Active	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	3 (168 Hours)	ROHS3 Compliant
MC74ACT245DWG	onsemi	Active	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	3 (168 Hours)	ROHS3 Compliant
CD74ACT245M96	Texas Instruments	Active	-55°C ~ 125°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	1 (Unlimited)	ROHS3 Compliant
SN74ACT245DWR	Texas Instruments	Active	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	1 (Unlimited)	ROHS3 Compliant
SN74ACT245NSR	Texas Instruments	Active	-40°C ~ 85°C	20-SO (0.209", 5.30mm)	4.5V ~ 5.5V	24mA, 24mA	1 (Unlimited)	ROHS3 Compliant
SN74ACT245DW	Texas Instruments	Discontinued at DiGi Electronics	-40°C ~ 85°C	20-SOIC (0.295", 7.50mm)	4.5V ~ 5.5V	24mA, 24mA	1 (Unlimited)	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Identical Operating Temperature Range):

74ACT245SC, MC74ACT245DWR2G, and MC74ACT245DWG from onsemi maintain the -40°C to 85°C operating temperature specification of the original 74ACTQ245SC. These parts are active products with ROHS3 compliance. SN74ACT245DWR from Texas Instruments offers equivalent specifications with MSL 1 rating and active product status.

Extended Temperature Range Alternative:

CD74ACT245M96 from Texas Instruments provides an extended operating temperature range of -55°C to 125°C while maintaining all other electrical parameters. This part is suitable for applications requiring broader temperature performance and carries MSL 1 (Unlimited) moisture sensitivity rating.

Package Variant:

SN74ACT245NSR from Texas Instruments uses a 20-SO package (0.209", 5.30mm width) instead of the standard 20-SOIC package. This represents a mechanical alternative with narrower body width, suitable for space-constrained layouts while maintaining identical electrical functionality and pinout compatibility.

Discontinued Status Consideration:

SN74ACT245DW is listed as discontinued at DiGi Electronics and should be avoided for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ245SC with 74ACT245SC?

A: Yes. Both parts are non-inverting transceivers with identical electrical specifications: 1 element, 8 bits per element, 3-state output, 24mA drive capability, and 4.5V to 5.5V supply voltage. The primary difference is product status (obsolete vs. active) and MSL rating. 74ACT245SC is the recommended direct replacement.

Q: What is the difference between the onsemi and Texas Instruments substitutes?

A: All substitutes maintain identical logic functionality and electrical parameters. Differences exist in operating temperature range (CD74ACT245M96 extends to -55°C to 125°C), moisture sensitivity level, and packaging options. Selection depends on application temperature requirements and supply chain availability.

Q: Can I use SN74ACT245NSR if my PCB layout requires the standard 20-SOIC package?

A: SN74ACT245NSR uses a 20-SO package with a narrower body width (0.209" vs. 0.295"). While pinout is compatible, physical footprint differs. Use only if your PCB layout accommodates the narrower 20-SO package dimensions.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute offers the best long-term availability?

A: CD74ACT245M96 and SN74ACT245DWR from Texas Instruments are active products with extended temperature range options and high inventory levels, providing strong long-term supply assurance for production applications.

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