74LCX244MSA Equivalent & Substitute Parts

Part Overview

The 74LCX244MSA is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The 74LCX244MSA operates within a 2V to 3.6V supply voltage range and is packaged in a 20-SSOP form factor suitable for surface mount applications.

Key Parameters

Parameter	74LCX244MSA
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 74LCX244MSA is determined by the following critical parameters:

Core Functional Requirements:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State

Electrical Compatibility Criteria:

Supply Voltage Range: Must encompass or be compatible with 2V ~ 3.6V
Output Current: 24mA minimum for both high and low states
Operating Temperature: Must support -40°C ~ 85°C minimum

Physical Compatibility:

Mounting Type: Surface Mount
Package Type: SSOP or TSSOP variants acceptable (pin-compatible or functionally equivalent)

Substitute parts are grouped into two categories based on these parameters: direct pin-compatible replacements in SSOP packaging, and functionally equivalent alternatives in TSSOP packaging with compatible electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Status
74LCX244MSA	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 3.6V	-40°C ~ 85°C	20-SSOP	Obsolete
MC74LCX244DTG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 5.5V	-55°C ~ 125°C	20-TSSOP	Active
74LVC2244APW,118	NXP Semiconductors	Buffer, Non-Inverting	2	4	3-State	12/12	1.2V ~ 3.6V	-40°C ~ 125°C	20-TSSOP	Active
SN74LVC2244ADBQR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-SSOP	Active
SN74LVC2244ADBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-SSOP	Active
SN74LVC2244ADGVR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-TVSOP	Active
SN74LVC2244APW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Active
SN74LVC2244APWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Active
SN74LVC244ADB	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.65V ~ 3.6V	-40°C ~ 125°C	20-SSOP	Active
SN74LVC244ADBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	1.65V ~ 3.6V	-40°C ~ 125°C	20-SSOP	Active
SN74LVC2244APWT	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	12/12	1.65V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Active

Engineering Selection Recommendations

Direct SSOP Package Replacements (Pin-Compatible):

SN74LVC244ADBR and SN74LVC244ADB from Texas Instruments provide the closest functional match to the 74LCX244MSA. Both maintain the 20-SSOP package format and deliver 24mA output current capability. SN74LVC244ADBR is available in Cut Tape & Digi-Reel packaging with active product status and RoHS3 compliance. SN74LVC2244ADBQR offers the same package and 24mA output current but with reduced operating temperature range (-40°C ~ 85°C).

TSSOP Package Alternatives (Functionally Equivalent):

MC74LCX244DTG from onsemi maintains the 74LCX series designation and delivers 24mA output current with extended supply voltage range (2V ~ 5.5V) and broader operating temperature (-55°C ~ 125°C). This part is active and available in 20-TSSOP packaging.

Texas Instruments SN74LVC2244 series parts in TSSOP variants (SN74LVC2244APW, SN74LVC2244APWR, SN74LVC2244APWT) provide active alternatives with RoHS3 compliance. These parts operate at reduced output current (12mA) but maintain supply voltage compatibility with the original specification.

Selection Criteria:

For applications requiring 24mA output current and SSOP packaging: SN74LVC244ADBR
For applications accepting TSSOP packaging with 24mA output: MC74LCX244DTG
For applications accepting reduced output current (12mA) with extended temperature range: SN74LVC2244APW series
All recommended substitutes are active products with current manufacturing support

Frequently Asked Questions (FAQ)

Q: Can SN74LVC2244ADBR directly replace 74LCX244MSA without PCB modification?

A: Yes. Both parts use 20-SSOP packaging with identical pin counts and compatible pinout. No PCB layout changes are required for this substitution.

Q: What is the difference between 74LCX and 74LVC series buffers?

A: The 74LCX series operates at 2V ~ 3.6V supply voltage, while 74LVC series operates at 1.65V ~ 3.6V. Both provide non-inverting buffer functionality with 3-state outputs. The 74LVC series offers broader voltage compatibility and is currently in active production.

Q: Why do some substitutes show 12mA output current instead of 24mA?

A: The 74LVC2244 variants deliver 12mA per output, while 74LVC244 variants deliver 24mA per output. Selection depends on your circuit's current drive requirements. Verify your application's load impedance to determine which output current rating is appropriate.

Q: Are TSSOP package parts compatible with SSOP footprints?

A: No. TSSOP (Thin Small Outline Package) and SSOP (Shrink Small Outline Package) have different physical dimensions and pin spacing. TSSOP packages are narrower (0.173" width) compared to SSOP packages (0.209" width). PCB footprint redesign is required when switching between these package types.

Q: Which substitute offers the best compliance and availability?

A: SN74LVC2244ADBR from Texas Instruments offers RoHS3 compliance, active product status, unlimited moisture sensitivity level (MSL 1), and 3,666 units in stock. This part provides optimal compliance posture and supply chain reliability.

Q: Can I use MC74LCX244DTG as a drop-in replacement?

A: MC74LCX244DTG requires PCB footprint modification due to TSSOP packaging, but it maintains the 74LCX series characteristics and 24mA output current. It offers extended operating temperature range (-55°C ~ 125°C) and higher supply voltage tolerance (2V ~ 5.5V).

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