SN74LVC244ADWRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC244ADWRE4 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 discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The device operates across a supply voltage range of 1.65V to 3.6V with output current capability of 24mA for both high and low states. It is RoHS3 compliant with MSL Level 1 (unlimited moisture sensitivity), suitable for industrial and commercial applications requiring low-voltage logic buffering.

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	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 125°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 SN74LVC244ADWRE4 is determined by the following critical parameters:

Functional Equivalence: Logic type (Buffer, Non-Inverting), number of elements (2), bits per element (4), and output type (3-State) must remain identical.

Electrical Compatibility: Supply voltage range, output current capability, and operating temperature range define the operational envelope. Parts with overlapping or extended ranges are acceptable.

Package Compatibility: The 20-SOIC package footprint is mandatory for direct PCB substitution without layout modification.

Compliance Requirements: RoHS3 compliance is required for regulatory alignment.

Substitute parts are grouped into two categories:

Texas Instruments Direct Equivalents – Same base product number (74LVC244) with identical electrical specifications and packaging, differing only in packaging format (Cut Tape, Tape & Reel) or automotive qualification.
Cross-Manufacturer Equivalents – Alternative manufacturers (onsemi, Fairchild Semiconductor, NXP USA Inc.) offering functionally identical 74LCX244 or 74LVC2244 series devices with comparable electrical performance and 20-SOIC packaging.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	Inventory
SN74LVC244ADWRE4	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	1.65 ~ 3.6V	-40 ~ 125	20-SOIC	Discontinued	1029
SN74LVC244ADWR	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	1.65 ~ 3.6V	-40 ~ 125	20-SOIC	Active	2200
CLVC244AQDWRG4Q1	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	1.65 ~ 3.6V	-40 ~ 125	20-SOIC	Active	2820
SN74LVC244ADWRG4	Texas Instruments	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	1.65 ~ 3.6V	-40 ~ 125	20-SOIC	Discontinued	2826
74LCX244WM	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	2.0 ~ 3.6V	-40 ~ 85	20-SOIC	Active	1697
74LCX244WMX	Fairchild Semiconductor	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	2.0 ~ 3.6V	-40 ~ 85	20-SOIC	Active	2135
74LVC2244AD,118	NXP USA Inc.	Buffer, Non-Inverting	2 / 4	3-State	12 / 12	1.2 ~ 3.6V	-40 ~ 125	20-SOIC	Active	6965
MC74LCX244DWG	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	2.0 ~ 5.5V	-55 ~ 125	20-SOIC	Active	1114
MC74LCX244DWR2G	onsemi	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	2.0 ~ 5.5V	-55 ~ 125	20-SOIC	Active	1597

Engineering Selection Recommendations

Primary Recommendation: SN74LVC244ADWR (Texas Instruments)

This part maintains identical electrical specifications and packaging to the discontinued SN74LVC244ADWRE4 while offering active product status and higher inventory availability (2200 units). It is the direct equivalent with no design modifications required.

Secondary Recommendation: CLVC244AQDWRG4Q1 (Texas Instruments, Automotive Grade)

This variant provides identical electrical performance with AEC-Q100 automotive qualification and the highest inventory level (2820 units). Select this part if automotive-grade certification is required or preferred for supply chain resilience.

Alternative Recommendation: MC74LCX244DWR2G (onsemi)

This part extends the supply voltage range to 5.5V and operating temperature to -55°C, providing broader environmental tolerance. It maintains 24mA output current and 20-SOIC packaging. Select when extended voltage or temperature margins are beneficial.

Consideration: 74LVC2244AD,118 (NXP USA Inc.)

This part offers the widest supply voltage range (1.2V ~ 3.6V) and active status with the highest inventory (6965 units). However, output current is reduced to 12mA per channel. Select only if lower output current is acceptable for the application.

Not Recommended: 74LCX244WM and 74LCX244WMX

These parts reduce the maximum operating temperature to 85°C and narrow the minimum supply voltage to 2.0V, creating operational constraints compared to the original specification. Use only if these limitations align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 74LCX244WM as a direct replacement for SN74LVC244ADWRE4?

A: Functionally yes, but with operational constraints. The 74LCX244WM maintains identical logic function, element count, bit width, and output type in the same 20-SOIC package. However, it reduces the maximum operating temperature from 125°C to 85°C and raises the minimum supply voltage from 1.65V to 2.0V. Use only if your application operates within these narrower limits.

Q: What is the difference between SN74LVC244ADWR and CLVC244AQDWRG4Q1?

A: Both parts are electrically identical with the same supply voltage (1.65V ~ 3.6V), output current (24mA), and temperature range (-40°C ~ 125°C). The CLVC244AQDWRG4Q1 carries AEC-Q100 automotive qualification, making it suitable for automotive applications. Choose based on whether automotive certification is required.

Q: Why does 74LVC2244AD,118 have lower output current (12mA vs 24mA)?

A: The 74LVC2244AD,118 is a different product variant within the 74LVC2244 family with inherently lower output drive capability. While it maintains the same logic function and package, the reduced current limits its ability to drive heavily loaded outputs. Verify your application's current requirements before selecting this part.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant except where not specified in the data. Verify compliance documentation for your specific procurement requirement.

Q: Can I use MC74LCX244DWG or MC74LCX244DWR2G in place of the original part?

A: Yes. Both onsemi parts provide identical logic function, element count, bit width, output type, and 20-SOIC packaging. They extend the supply voltage range to 5.5V and operating temperature to -55°C, offering broader environmental tolerance. The primary difference is packaging format: DWG is tube packaging, DWR2G is tape and reel. Both are functionally equivalent.

Q: What is the significance of the packaging suffix (ADWRE4 vs ADWR vs ADWRG4)?

A: The suffix indicates packaging format and reel configuration. ADWRE4 is cut tape with Digi-Reel packaging (discontinued). ADWR is cut tape or Digi-Reel (active). ADWRG4 is tape and reel (discontinued). These differences do not affect electrical performance or PCB compatibility, only procurement and handling logistics.

Q: Which substitute part has the best inventory availability?

A: The 74LVC2244AD,118 (NXP USA Inc.) offers the highest inventory at 6965 units. If supply chain continuity is the primary concern and the 12mA output current meets application requirements, this part provides the best availability.

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