74LCX2244WM Equivalent & Substitute Parts

Part Overview

The 74LCX2244WM is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This device operates across a 2V to 3.6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX2244WM
Manufacturer	onsemi
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	12mA, 12mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX2244WM is determined by the following critical parameters:

Logic Function: Buffer, Non-Inverting with 2 elements, 4 bits per element, 3-state output
Package Compatibility: 20-SOIC form factor (0.295" width)
Voltage Supply Range: Minimum 2V to 3.6V support required
Output Current: Minimum 12mA per output (high and low)
Operating Temperature: Support for -40°C to 85°C range
Pin Configuration: Identical pinout within 20-SOIC package

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (Same Output Current): Parts with 12mA output current matching the original specification. These include SN74LVC2244ADW, SN74LVC2244ADWR, SN74LVC2244ANS, and SN74LVC2244ANSR from Texas Instruments, and 74LVC2244AD,118 from NXP USA Inc.

Category B - Enhanced Performance Substitutes (Higher Output Current): Parts with 24mA output current, providing greater drive capability while maintaining backward compatibility. These include MC74LCX244DWG and MC74LCX244DWR2G from onsemi, and SN74LVC244ADW and SN74LVC244ADWR from Texas Instruments.

Parameter Comparison

Parameter	74LCX2244WM	MC74LCX244DWG	MC74LCX244DWR2G	74LVC2244AD,118	SN74LVC2244ADW	SN74LVC2244ADWR	SN74LVC2244ANS	SN74LVC2244ANSR	SN74LVC244ADW	SN74LVC244ADWE4	SN74LVC244ADWR
Manufacturer	onsemi	onsemi	onsemi	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	12mA, 12mA	24mA, 24mA	24mA, 24mA	12mA, 12mA	12mA, 12mA	12mA, 12mA	12mA, 12mA	12mA, 12mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 3.6V	2V ~ 5.5V	2V ~ 5.5V	1.2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

SN74LVC2244ADWR and SN74LVC2244ADW from Texas Instruments are the preferred substitutes. Both maintain the original 12mA output current specification, operate within the required 1.65V to 3.6V supply range, and support the -40°C to 85°C temperature range. These parts are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental compliance.

Alternative Substitutes (Extended Performance)

MC74LCX244DWR2G and MC74LCX244DWG from onsemi provide enhanced output current (24mA) and extended operating temperature range (-55°C to 125°C). These parts remain within the same manufacturer family and package footprint. The higher output current provides additional design margin for applications requiring greater drive capability. Both are ROHS3 compliant and active products.

SN74LVC244ADW and SN74LVC244ADWR from Texas Instruments offer 24mA output current with extended temperature range (-40°C to 125°C). These parts are suitable for applications requiring higher current drive or broader temperature operation.

Package Consideration

SN74LVC2244ANS and SN74LVC2244ANSR use a narrower 20-SOIC package (0.209" width) compared to the original 0.295" width. PCB layout verification is required before selection to confirm package footprint compatibility.

Status-Based Selection

Avoid SN74LVC244ADWE4, which is discontinued at DiGi Electronics. All other recommended substitutes maintain active product status, ensuring continued availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current (24mA) in place of the original 12mA specification?

A: Yes. Higher output current is a superset capability. Parts rated for 24mA output current can drive loads requiring 12mA or less. This provides additional design margin without compromising functionality.

Q: Are all substitute parts pin-compatible with the 74LCX2244WM?

A: All listed substitutes maintain identical pinout within the 20-SOIC package family. However, SN74LVC2244ANS and SN74LVC2244ANSR use a narrower package width (0.209" vs. 0.295"). Verify PCB footprint compatibility before assembly.

Q: What is the difference between the onsemi 74LCX and Texas Instruments 74LVC series?

A: Both series provide non-inverting buffer functionality with identical logic specifications. The 74LVC series from Texas Instruments offers lower minimum supply voltage (1.65V vs. 2V) and is more widely available in active product status. The 74LCX series from onsemi supports higher supply voltage (up to 5.5V) in some variants.

Q: Does the extended temperature range (-55°C to 125°C) of MC74LCX244DWG and MC74LCX244DWR2G affect compatibility?

A: No. Extended temperature range is a superset specification. Parts rated for -55°C to 125°C operation are fully compatible with applications requiring only -40°C to 85°C performance.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: The original 74LCX2244WM has MSL 1 (unlimited shelf life). Substitutes with MSL 3 (168 hours) require controlled storage conditions. For long-term inventory, prioritize MSL 1 rated parts: SN74LVC2244ADW, SN74LVC2244ADWR, SN74LVC2244ANS, and SN74LVC2244ANSR.

Q: Are all substitutes ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 74LCX2244WM does not specify RoHS status. Verify compliance requirements for your application before final selection.

Q: Which substitute offers the best long-term availability?

A: SN74LVC2244ADWR from Texas Instruments is recommended for long-term designs. It maintains active product status, ROHS3 compliance, MSL 1 rating, and is available in standard Tape & Reel packaging with high inventory levels.

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