CD74AC244M Equivalent & Substitute Parts

Part Overview

The CD74AC244M is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The 74AC244 series provides buffering functionality suitable for digital logic applications requiring signal isolation and drive capability across the specified voltage and temperature ranges.

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	1.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Base Product Number	74AC244

Substitute Part Grouping Explanation

Substitution eligibility for the CD74AC244M is determined by the following criteria:

Core Functional Parameters (Must Match):

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
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C (TA)

Voltage Supply Tolerance:

CD74AC244M operates at 1.5V ~ 5.5V
Substitute parts operating at 2V ~ 6V are compatible, as the 2V ~ 6V range encompasses the original specification within the critical operating window

Packaging Format Variations: Substitutes may differ in packaging format (Tube, Tape & Reel, Cut Tape & Digi-Reel) without affecting functional equivalence, as all maintain the same 20-SOIC physical package specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range	Package	Product Status
CD74AC244M	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Discontinued
CD74AC244M96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
74AC244SC	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active
74AC244SCX	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active
MC74AC244DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active
MC74AC244DWR2G	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): CD74AC244M96 from Texas Instruments is the direct equivalent, maintaining identical voltage supply range (1.5V ~ 5.5V) and all functional parameters. This part is currently active and available, making it the preferred replacement for the discontinued CD74AC244M.

Secondary Substitutes (Voltage Range Consideration): 74AC244SCX (onsemi), MC74AC244DWG (onsemi), and MC74AC244DWR2G (onsemi) are functionally equivalent with expanded voltage supply range (2V ~ 6V). These parts are active and widely available. The 74AC244SC (Fairchild Semiconductor) is also compatible but with lower current availability.

Compliance Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original CD74AC244M specification. Moisture sensitivity levels vary between MSL 1 (CD74AC244M96) and MSL 3 (onsemi variants), which may affect storage and handling requirements in high-humidity environments.

Frequently Asked Questions (FAQ)

Q: Can CD74AC244M96 be used as a direct replacement for CD74AC244M? A: Yes. CD74AC244M96 is manufactured by Texas Instruments and maintains identical functional parameters, voltage supply range, and package specification. The primary difference is packaging format (Tape & Reel vs. Tube) and active product status.

Q: Are onsemi parts (74AC244SCX, MC74AC244DWG, MC74AC244DWR2G) compatible with CD74AC244M? A: Yes, with voltage supply consideration. These parts operate at 2V ~ 6V versus the original 1.5V ~ 5.5V. For applications operating within the 2V ~ 6V window, these parts are functionally equivalent. Applications requiring operation below 2V require CD74AC244M96.

Q: What is the difference between 74AC244SCX and MC74AC244DWG? A: Both are onsemi 74AC244 variants with identical electrical specifications. The primary difference is packaging format: 74AC244SCX is supplied in Cut Tape & Digi-Reel format, while MC74AC244DWG is supplied in Tube format. Functional performance is equivalent.

Q: Does packaging format affect electrical performance? A: No. Packaging format (Tube, Tape & Reel, Cut Tape) does not affect electrical performance or functional equivalence. Selection should be based on procurement and assembly requirements.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences? A: MSL 1 (unlimited) parts like CD74AC244M96 have no moisture sensitivity restrictions. MSL 3 (168 hours) parts like onsemi variants require controlled storage conditions and have a 168-hour floor life after moisture exposure. Storage and handling procedures should align with the selected part's MSL rating.

Q: Can 74AC244SC be used as a substitute? A: Yes. 74AC244SC from Fairchild Semiconductor meets all functional requirements with 2V ~ 6V voltage supply range. However, inventory availability (1415 Pcs) is lower than onsemi alternatives, which may affect procurement feasibility.

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