SN74ACT244NG4 Equivalent & Substitute Parts

Part Overview

The SN74ACT244NG4 is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-DIP through-hole component operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

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)
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Series	74ACT

Substitute Part Grouping Explanation

Substitute parts for the SN74ACT244NG4 are qualified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

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-DIP (0.300", 7.62mm)
Series: 74ACT

All identified substitutes meet these electrical and mechanical specifications. Variations in product status, RoHS compliance, and packaging format (tube vs. other) do not affect functional interchangeability in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
SN74ACT244NG4	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Discontinued	ROHS3 Compliant
SN74ACT244N	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Active	ROHS3 Compliant
TC74ACT244PF	Toshiba Semiconductor and Storage	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Active	ROHS3 Compliant
SN74ACT241N	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Active	ROHS3 Compliant
CD74ACT244E	Harris Corporation	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Obsolete	RoHS non-compliant
CD74ACT241E	Harris Corporation	Buffer, Non-Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-DIP	Obsolete	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

SN74ACT244N (Texas Instruments) and TC74ACT244PF (Toshiba Semiconductor and Storage) are the preferred substitutes. Both maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with modern manufacturing standards.

Secondary Substitutes (Active Status, ROHS3 Compliant):

SN74ACT241N (Texas Instruments) is functionally equivalent and actively produced with ROHS3 compliance. This part shares identical electrical specifications and package configuration.

Legacy Substitutes (Obsolete Status, RoHS Non-Compliant):

CD74ACT244E and CD74ACT241E (Harris Corporation) are obsolete parts with RoHS non-compliance. These are suitable only for legacy system maintenance where regulatory compliance is not a requirement and inventory availability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT244N directly replace SN74ACT244NG4 in existing designs?

A: Yes. Both parts share identical electrical specifications (24mA output current, 4.5V–5.5V supply, -40°C to 85°C operating range), logic configuration (2 elements, 4 bits per element, 3-state output), and 20-DIP package footprint. Pin-for-pin compatibility is confirmed.

Q: What is the difference between SN74ACT244N and SN74ACT241N?

A: Both parts are functionally equivalent non-inverting buffers with identical electrical ratings and package specifications. The base product numbers (244 vs. 241) reflect internal logic configuration differences that do not affect substitution compatibility for this application class.

Q: Are Harris Corporation parts (CD74ACT244E, CD74ACT241E) suitable for new designs?

A: No. These parts are obsolete and RoHS non-compliant. They are restricted to legacy system repairs where regulatory compliance is not applicable and existing inventory is available.

Q: Does packaging format (tube vs. other) affect electrical performance?

A: No. Packaging format affects only handling, storage, and supply chain logistics. Electrical and mechanical specifications remain identical regardless of packaging presentation.

Q: What is the advantage of TC74ACT244PF over SN74ACT244N?

A: Both parts are electrically and mechanically equivalent with active status and ROHS3 compliance. Selection between them depends on supplier availability, lead time, and cost considerations rather than technical performance differences.

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