74LCX244MSAX Equivalent & Substitute Parts

Part Overview

The 74LCX244MSAX is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. Designed for 3.6V logic applications, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying functionally equivalent substitute parts is essential for design continuity and procurement flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX244MSAX
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	24mA, 24mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX244MSAX is determined by the following critical parameters:

Logic Function: Buffer, Non-Inverting with 2 elements, 4 bits per element, 3-state output
Supply Voltage Range: Minimum 2V support; maximum 3.6V or higher
Output Current: 24mA or higher for both high and low states
Package Compatibility: 20-pin surface mount packages (SSOP or TSSOP variants acceptable)
Operating Temperature: Minimum -40°C; maximum 85°C or higher
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Category 1 - Direct Functional Equivalents (24mA Output Current) Parts maintaining the 24mA output current specification of the original part.

Category 2 - Functional Alternatives (12mA Output Current) Parts with reduced output current (12mA) but meeting all other critical parameters. These are suitable for applications where the lower drive capability is acceptable.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	RoHS Status
74LCX244MSAX	onsemi	Buffer, Non-Inverting	2 / 4	24 / 24	2V ~ 3.6V	-40 ~ 85	20-SSOP	Obsolete	N/A
MC74LCX244DTG	onsemi	Buffer, Non-Inverting	2 / 4	24 / 24	2V ~ 5.5V	-55 ~ 125	20-TSSOP	Active	ROHS3 Compliant
SN74LVC244ADBR	Texas Instruments	Buffer, Non-Inverting	2 / 4	24 / 24	1.65V ~ 3.6V	-40 ~ 125	20-SSOP	Active	ROHS3 Compliant
74LVC2244APW,118	NXP Semiconductors	Buffer, Non-Inverting	2 / 4	12 / 12	1.2V ~ 3.6V	-40 ~ 125	20-TSSOP	Active	N/A
SN74LVC2244ADBQR	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-SSOP	Active	ROHS3 Compliant
SN74LVC2244ADBR	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-SSOP	Active	ROHS3 Compliant
SN74LVC2244ADGVR	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-TVSOP	Active	ROHS3 Compliant
SN74LVC2244APW	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-TSSOP	Active	ROHS3 Compliant
SN74LVC2244APWR	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-TSSOP	Active	ROHS3 Compliant
SN74LVC2244APWT	Texas Instruments	Buffer, Non-Inverting	2 / 4	12 / 12	1.65V ~ 3.6V	-40 ~ 85	20-TSSOP	Active	ROHS3 Compliant
SN74LVC244ADB	Texas Instruments	Buffer, Non-Inverting	2 / 4	24 / 24	1.65V ~ 3.6V	-40 ~ 125	20-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Matching 24mA Output Current)

SN74LVC244ADBR (Texas Instruments) is the recommended primary substitute. It maintains the 24mA output current specification, operates within the required 3.6V supply range, and is actively manufactured with ROHS3 compliance. The identical 20-SSOP package ensures direct PCB compatibility. Extended operating temperature range (-40°C to 125°C) provides additional margin beyond the original specification.

MC74LCX244DTG (onsemi) serves as an alternative primary substitute with matching 24mA output current and active product status. The 20-TSSOP package requires PCB layout verification but offers extended supply voltage range (2V to 5.5V) and broader operating temperature range (-55°C to 125°C).

SN74LVC244ADB (Texas Instruments) provides equivalent functionality with 24mA output current and active status. ROHS3 compliance and extended temperature range support long-term design requirements.

Secondary Substitutes (12mA Output Current)

The 74LVC2244 series from Texas Instruments and NXP Semiconductors offers functional substitution with reduced output current (12mA). These parts are suitable for applications where the lower drive capability meets system requirements. All variants maintain active product status and ROHS3 compliance. Multiple package options (20-SSOP, 20-TSSOP, 20-TVSOP) and packaging formats (Tube, Tape & Reel, Cut Tape) provide procurement flexibility.

SN74LVC2244ADBR and SN74LVC2244ADBQR (Texas Instruments) in 20-SSOP package offer direct footprint compatibility with the original part. SN74LVC2244APW, SN74LVC2244APWR, and SN74LVC2244APWT provide 20-TSSOP alternatives with various packaging options.

74LVC2244APW,118 (NXP Semiconductors) offers the widest supply voltage range (1.2V to 3.6V) among 12mA alternatives, with high inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 12mA output current part as a direct replacement for the 24mA specification?

A: Substitution with 12mA output current parts is permissible only if your circuit design does not require the full 24mA drive capability. Verify that downstream logic inputs and load impedances are compatible with reduced output current. If your application requires 24mA output current, use primary substitutes maintaining this specification.

Q: Are package variants (SSOP vs. TSSOP vs. TVSOP) interchangeable?

A: Package variants are not interchangeable on the PCB. SSOP (0.209" width), TSSOP (0.173" width), and TVSOP (0.173" width) have different footprints. Verify your PCB layout supports the selected package before procurement. All variants maintain 20-pin configuration and identical pin assignments.

Q: What is the significance of the obsolete status for the 74LCX244MSAX?

A: Obsolete status indicates the part is no longer manufactured by onsemi. While existing inventory may be available, long-term procurement cannot be assured. Active substitutes provide design continuity and supply chain reliability for new designs and production runs.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Most active substitutes carry ROHS3 compliance certification. Verify specific compliance requirements for your application and supply chain. The original 74LCX244MSAX does not list RoHS status; confirm compliance requirements with your procurement department.

Q: How do supply voltage ranges affect substitution decisions?

A: The original part operates at 2V to 3.6V. All recommended substitutes support the 3.6V maximum. Some alternatives (MC74LCX244DTG, 74LVC2244 series) support higher maximum voltages (5.5V or greater), providing additional design margin. Lower minimum voltage support (1.2V to 1.65V) in some alternatives does not affect 3.6V applications but may enable future low-voltage designs.

Q: What packaging options are available for procurement?

A: Substitute parts are available in multiple packaging formats: Tube, Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Bulk. Select packaging based on production volume and handling requirements. Inventory availability varies by part number and packaging format.

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