SN74HC244DW Equivalent & Substitute Parts

Part Overview

The SN74HC244DW is a non-inverting buffer IC manufactured by Texas Instruments, designed for logic signal buffering applications. It features 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC244DW
Manufacturer	Texas Instruments
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC244DW 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
Current - Output High, Low: 7.8mA, 7.8mA
Voltage - Supply: 2V ~ 6V
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (identical specifications and packaging), Manufacturer Recommended Substitutes (functionally equivalent with minor variations in operating temperature or MSL), and Parametric Equivalents (same electrical performance with compatible packaging).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	Product Status
SN74HC244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOIC	Discontinued
SN74HC244DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOIC	Active
MC74HC244ADWR2G	onsemi	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-55 ~ 125	20-SOIC	Active
MM74HC244WM	onsemi	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOIC	Active
MM74HC244WMX	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOIC	Active
74HC244D,653	Nexperia USA Inc.	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 125	20-SOIC	Active
74HC244D-Q100,118	NXP USA Inc.	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 125	20-SOIC	Active
MC74HC244ADWG	onsemi	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-55 ~ 125	20-SOIC	Active
TC74HC244AF(EL,F)	Toshiba Semiconductor and Storage	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOP	Active
SN74HC241DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	7.8 / 7.8	2 ~ 6	-40 ~ 85	20-SOIC	Discontinued

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC244DW, the SN74HC244DWR from Texas Instruments is the primary choice, offering identical electrical specifications and packaging with active product status and ROHS3 compliance.

When extended operating temperature range is required, MC74HC244ADWR2G or MC74HC244ADWG from onsemi provide -55°C to 125°C operation while maintaining all electrical parameters and 20-SOIC packaging. Both are ROHS3 compliant and actively manufactured.

For applications requiring alternative manufacturers, 74HC244D,653 from Nexperia USA Inc. and 74HC244D-Q100,118 from NXP USA Inc. deliver equivalent performance with extended temperature ratings (-40°C to 125°C) and ROHS3 compliance in 20-SOIC packaging.

MM74HC244WM and MM74HC244WMX from onsemi and Fairchild Semiconductor respectively are functionally equivalent with standard temperature ranges and active product status.

TC74HC244AF(EL,F) from Toshiba Semiconductor is compatible but uses a narrower 20-SOP package (0.209" width versus 0.295"), requiring PCB layout verification before selection.

Frequently Asked Questions (FAQ)

Q: Can SN74HC244DWR be used as a direct replacement for SN74HC244DW?

A: Yes. SN74HC244DWR is electrically and mechanically identical to SN74HC244DW, with the same 20-SOIC package, operating temperature range (-40°C to 85°C), supply voltage (2V to 6V), and output current specifications (7.8mA). The primary difference is product status: SN74HC244DWR is actively manufactured while SN74HC244DW is discontinued.

Q: What is the difference between 20-SOIC and 20-SOP packages?

A: Both are surface-mount packages with 20 pins, but differ in physical dimensions. The 20-SOIC package is 0.295" wide, while the 20-SOP package is 0.209" wide. This dimensional difference requires verification of PCB footprint compatibility before substitution. TC74HC244AF(EL,F) uses the narrower 20-SOP package.

Q: Are onsemi MC74HC244 variants compatible with the original Texas Instruments part?

A: Yes. MC74HC244ADWR2G and MC74HC244ADWG from onsemi maintain identical logic type, element count, bit configuration, output type, and current specifications. Both use 20-SOIC packaging and are ROHS3 compliant. The MC74HC244ADWR2G and MC74HC244ADWG variants offer extended operating temperature (-55°C to 125°C) compared to the original -40°C to 85°C range.

Q: Which substitute offers the widest operating temperature range?

A: MC74HC244ADWR2G, MC74HC244ADWG, 74HC244D,653, and 74HC244D-Q100,118 all support -55°C to -40°C minimum and 125°C maximum, providing the widest temperature coverage for applications requiring extended thermal performance.

Q: Is RoHS compliance maintained across all substitutes?

A: ROHS3 compliance is confirmed for SN74HC244DWR, MC74HC244ADWR2G, MM74HC244WM, 74HC244D,653, MC74HC244ADWG, and TC74HC244AF(EL,F). Compliance status should be verified with the supplier for MM74HC244WMX and 74HC244D-Q100,118 before procurement.

Q: What packaging options are available for this logic buffer?

A: All substitutes are available in 20-SOIC (0.295" width) except TC74HC244AF(EL,F), which uses 20-SOP (0.209" width). Packaging variants include Cut Tape (CT) & Digi-Reel, Tube, and Tape & Reel (TR) options depending on the specific part number and manufacturer.

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