CD74HCT244M Equivalent & Substitute Parts

Part Overview

The CD74HCT244M 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 and substitute parts necessary for ongoing design support and procurement.

The 74HCT244 series provides buffering functionality suitable for bus driver applications with TTL-compatible logic levels. Substitute parts must maintain electrical compatibility across supply voltage, output current, operating temperature, and functional characteristics to ensure direct replacement capability.

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	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Series	74HCT

Substitute Part Grouping Explanation

Substitution of the CD74HCT244M is determined by the following critical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage Supply Range: 4.5V ~ 5.5V
Package Type: 20-SOIC form factor
Output Current Capability: Minimum 6mA per output
Operating Temperature Range: Must support -55°C to 125°C or equivalent industrial range

Parts are grouped into three categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging, differing only in packaging format (tube, tape & reel, or cut tape).

Parametric Equivalents provide the same functional performance with minor variations in output current or temperature range that remain within acceptable operating margins.

Manufacturer Recommended Alternatives are qualified substitutes from different manufacturers that meet all critical electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	RoHS Status
CD74HCT244M	Texas Instruments	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-55 ~ 125	20-SOIC	Discontinued	ROHS3
CD74HCT244M96	Texas Instruments	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-55 ~ 125	20-SOIC	Active	ROHS3
CD74HCT241M	Harris Corporation	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-55 ~ 125	20-SOIC	Obsolete	Non-compliant
MC74HCT244ADWR2G	onsemi	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-55 ~ 125	20-SOIC	Active	ROHS3
MM74HCT244WM	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	7.2, 7.2	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Active	Not specified
74HCT244D,653	Nexperia USA Inc.	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-40 ~ 125	20-SO	Active	ROHS3
74HCT244D-Q100,118	Nexperia USA Inc.	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-40 ~ 125	20-SO	Active	ROHS3
MM74HCT244WMX	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	7.2, 7.2	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Active	Not specified
MC74HCT244ADWG	onsemi	Buffer, Non-Inverting	2	4	6, 6	4.5V ~ 5.5V	-55 ~ 125	20-SOIC	Active	ROHS3

Engineering Selection Recommendations

Preferred Direct Replacement: CD74HCT244M96 (Texas Instruments) is the primary substitute, offering identical electrical specifications and full temperature range support (-55°C to 125°C). This part is currently active and available in higher quantities (5368 pcs), making it the most direct replacement for the discontinued CD74HCT244M.

Alternative Active Sources: MC74HCT244ADWR2G (onsemi) and MC74HCT244ADWG (onsemi) provide full parametric equivalence with identical output current (6mA) and temperature range (-55°C to 125°C). Both parts are ROHS3 compliant and actively manufactured.

Nexperia Alternatives: 74HCT244D,653 and 74HCT244D-Q100,118 (Nexperia USA Inc.) are active alternatives with identical electrical performance. The Q100,118 variant includes AEC-Q100 automotive qualification. Operating temperature range is -40°C to 125°C, which covers most industrial applications but does not extend to -55°C.

Fairchild Semiconductor Options: MM74HCT244WM and MM74HCT244WMX (Fairchild Semiconductor) are active parts with slightly elevated output current (7.2mA vs. 6mA), which provides additional drive capability. Operating temperature range is limited to -40°C to 85°C, making these suitable only for commercial and industrial applications not requiring extended low-temperature operation.

Avoid: CD74HCT241M (Harris Corporation) is obsolete and RoHS non-compliant, making it unsuitable for new designs despite parametric equivalence.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT244M96 be used as a direct replacement for CD74HCT244M? A: Yes. CD74HCT244M96 is electrically identical to the discontinued CD74HCT244M, with the same output current (6mA), supply voltage range (4.5V ~ 5.5V), and full operating temperature range (-55°C to 125°C). The difference is packaging format (cut tape/digi-reel vs. tube).

Q: What is the difference between 20-SOIC and 20-SO packages? A: Both designations refer to 20-pin small-outline IC packages with 0.295" (7.50mm) width. The packages are mechanically and electrically compatible for PCB mounting and soldering purposes.

Q: Are the Fairchild MM74HCT244WM and MM74HCT244WMX suitable replacements? A: These parts are functionally compatible with higher output current (7.2mA vs. 6mA), which is beneficial for drive capability. However, the operating temperature range is limited to -40°C to 85°C. Use these only if your application does not require operation below -40°C or above 85°C.

Q: Why is the CD74HCT241M not recommended despite matching specifications? A: The CD74HCT241M is obsolete and RoHS non-compliant. Current regulations and supply chain practices favor ROHS3-compliant active parts. Additionally, obsolete parts present long-term procurement risk.

Q: Can I use the Nexperia 74HCT244D-Q100,118 in non-automotive applications? A: Yes. The AEC-Q100 automotive qualification indicates enhanced reliability testing and is suitable for any application requiring high reliability. This part is fully compatible with standard industrial and commercial applications.

Q: What output current should I verify in my circuit design? A: The CD74HCT244M and most equivalents provide 6mA output current. Fairchild parts provide 7.2mA. Verify that your load impedance and fanout requirements are satisfied by the specified output current. Higher current capability (7.2mA) provides additional margin but does not change functional compatibility.

Q: Are all substitute parts ROHS3 compliant? A: Most active substitutes are ROHS3 compliant (CD74HCT244M96, MC74HCT244ADWR2G, MC74HCT244ADWG, 74HCT244D,653, 74HCT244D-Q100,118). Fairchild parts do not specify RoHS status. Verify compliance requirements for your application before selection.

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