74ACTQ244SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ244SCX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device is rated for 4.5V to 5.5V supply voltage operation across the -40°C to 85°C temperature range in a 20-SOIC surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the 74ACTQ244SCX is determined by matching the following critical parameters: logic type (buffer, non-inverting), element and bit configuration (2 elements, 4 bits per element), 3-state output capability, output current specifications (24mA high and low), supply voltage range (4.5V to 5.5V), and package type (20-SOIC surface mount). Parts are grouped into two categories: parametric equivalents that maintain identical electrical and mechanical specifications, and similar parts that share the same functional characteristics but may differ in product status, packaging format, or manufacturer.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
74ACTQ244SCX	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Obsolete	Not specified
MC74ACT244DWG	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Active	ROHS3 Compliant
74ACT244SCX	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Active	ROHS3 Compliant
MC74ACT241DWR2G	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Active	ROHS3 Compliant
MC74ACT244DWR2G	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Active	ROHS3 Compliant
NLV74ACT244DWR2G	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Obsolete	ROHS3 Compliant
SN74ACT244DW	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74ACT244MDWREP	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	Active	ROHS3 Compliant
SN74ACT244MNSREP	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SO (5.30mm)	Active	ROHS3 Compliant
SN74ACT244NSR	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SO (5.30mm)	Active	ROHS3 Compliant
CD74ACT241M96	Harris Corporation	Buffer, Non-Inverting	2 / 4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	Obsolete	RoHS non-compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 74ACTQ244SCX, the MC74ACT244DWG and 74ACT244SCX from onsemi are the primary selections, both maintaining active product status and ROHS3 compliance. The MC74ACT244DWR2G offers equivalent electrical performance with tape and reel packaging suitable for high-volume production environments. Texas Instruments alternatives SN74ACT244DW and SN74ACT244MDWREP provide functional equivalence; however, SN74ACT244DW is discontinued at DiGi Electronics, while SN74ACT244MDWREP extends the operating temperature range to -55°C to 125°C for applications requiring wider thermal performance. The SN74ACT244MNSREP and SN74ACT244NSR use a narrower 20-SO package (5.30mm width) compared to the standard 20-SOIC (7.50mm width), requiring PCB layout verification before selection. CD74ACT241M96 from Harris Corporation is obsolete and RoHS non-compliant, limiting its use to legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can I use MC74ACT244DWG as a direct replacement for 74ACTQ244SCX? A: Yes. Both parts share identical logic type, element configuration, output specifications, supply voltage range, and operating temperature. MC74ACT244DWG is active and ROHS3 compliant, making it suitable for new designs and production.

Q: What is the difference between 74ACT244SCX and MC74ACT244DWR2G? A: Both are parametric equivalents with matching electrical and mechanical specifications. The primary difference is packaging format: 74ACT244SCX uses cut tape and Digi-Reel format, while MC74ACT244DWR2G uses tape and reel format for automated assembly processes.

Q: Why do SN74ACT244MNSREP and SN74ACT244NSR have different package widths? A: SN74ACT244MNSREP and SN74ACT244NSR use the 20-SO package (0.209", 5.30mm width) instead of the standard 20-SOIC (0.295", 7.50mm width). This narrower package requires verification of PCB footprint compatibility before substitution.

Q: Is SN74ACT244MDWREP suitable for applications requiring extended temperature operation? A: Yes. SN74ACT244MDWREP operates across -55°C to 125°C, compared to the standard -40°C to 85°C range of the 74ACTQ244SCX. This extended range is suitable for industrial and automotive applications with wider thermal requirements.

Q: Can I use CD74ACT241M96 in new designs? A: No. CD74ACT241M96 is obsolete and RoHS non-compliant. It is suitable only for legacy system maintenance where existing inventory exists.

Q: What packaging options are available for the 74ACT244 series? A: Available packaging formats include cut tape and Digi-Reel (74ACT244SCX), tube (MC74ACT244DWG, SN74ACT244DW), tape and reel (MC74ACT244DWR2G, SN74ACT244MDWREP, NLV74ACT244DWR2G), and bulk (CD74ACT241M96).

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