74ABT244CMTC Equivalent & Substitute Parts

Part Overview

The 74ABT244CMTC is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. Housed in a 20-TSSOP package, this component operates across a 4.5V to 5.5V supply voltage range and supports output currents of 32mA (high) and 64mA (low). The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT244CMTC
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	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ABT244CMTC are grouped based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
Series: 74ABT

Package Compatibility Levels:

Direct Package Match (20-TSSOP): Parts maintaining identical package dimensions (0.173", 4.40mm Width) provide pin-for-pin compatibility
Alternative Package (20-SSOP): Parts using 20-SSOP (0.209", 5.30mm Width) maintain functional equivalence but require PCB layout adjustment

Output Current Variations:

Standard specification: 32mA (high), 64mA (low)
Military-grade variant: 24mA (high), 48mA (low) with extended temperature range (-55°C ~ 125°C)

Product Status Consideration: Active-status parts are preferred for new designs and long-term availability. The main part (74ABT244CMTC) is obsolete; all listed substitutes are either active or discontinued at specific distributors only.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
74ABT244CMTC	onsemi	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-TSSOP	Obsolete
74ABT244PW,118	Nexperia USA Inc.	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-TSSOP	Active
SN74ABT2244ADBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/12	4.5-5.5V	-40 to 85	20-SSOP	Active
SN74ABT2244APW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/12	4.5-5.5V	-40 to 85	20-TSSOP	Active
SN74ABT2244APWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/12	4.5-5.5V	-40 to 85	20-TSSOP	Active
SN74ABT244ADB	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-SSOP	Active
SN74ABT244ADBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-SSOP	Active
SN74ABT244ADBRG4	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-SSOP	Discontinued at DiGi Electronics
SN74ABT244AMDBREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/48	4.5-5.5V	-55 to 125	20-SSOP	Active
SN74ABT244APWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-TSSOP	Active
SN74ABT241APW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.5-5.5V	-40 to 85	20-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, 20-TSSOP Package):

Select from parts maintaining identical package geometry and output current specifications (32mA high, 64mA low):

SN74ABT244APWR (Texas Instruments, active status, highest inventory at 17,100 units)
74ABT244PW,118 (Nexperia USA Inc., active status, 5,964 units available)
SN74ABT241APW (Texas Instruments, active status, parametric equivalent with 74ABT241 base number)

For Package-Flexible Designs (20-SSOP Alternative):

When PCB layout permits 20-SSOP package accommodation (0.209" width vs. 0.173"):

SN74ABT244ADB or SN74ABT244ADBR (Texas Instruments, matching 32mA/64mA output current, active status)
SN74ABT2244ADBR (Texas Instruments, reduced output current at 32mA/12mA, active status)

For Extended Temperature Applications:

SN74ABT244AMDBREP supports -55°C to 125°C operating range with reduced output current (24mA/48mA), suitable for military or industrial environments requiring wider temperature tolerance.

Compliance and Certification:

All active substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original 74ABT244CMTC. Moisture sensitivity level remains constant at MSL 1 (unlimited) across all variants.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT2244APW or SN74ABT2244ADBR replace the 74ABT244CMTC directly?

A: These parts are functionally equivalent but use the 74ABT2244 base number instead of 74ABT244. They maintain identical logic configuration (2 elements, 4 bits per element, 3-state output) and supply voltage range (4.5V-5.5V). However, SN74ABT2244APW and SN74ABT2244ADBR specify reduced output current (32mA high, 12mA low) compared to the original specification (32mA high, 64mA low). Verify your circuit's output current requirements before selection.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: Both are 20-pin surface-mount packages with identical pin count and function. The primary difference is physical width: 20-TSSOP measures 0.173" (4.40mm) while 20-SSOP measures 0.209" (5.30mm). Pin spacing and pitch remain compatible. If your PCB layout accommodates the wider 20-SSOP footprint, parts in this package offer additional options. Direct 20-TSSOP replacements require no layout modification.

Q: Why does SN74ABT244AMDBREP have different output current and temperature specifications?

A: SN74ABT244AMDBREP is a military-grade variant designed for extended temperature operation (-55°C to 125°C versus -40°C to 85°C). The reduced output current (24mA high, 48mA low) reflects design optimization for this wider temperature range. Select this part only if your application requires military-grade temperature performance; standard commercial-grade parts are adequate for -40°C to 85°C environments.

Q: Is the 74ABT244CMTC still available, or must I use a substitute?

A: The 74ABT244CMTC is classified as obsolete. All recommended substitutes are active-status parts with current manufacturing and distribution. Nexperia and Texas Instruments actively produce equivalent models. For new designs or ongoing procurement, select from the active-status alternatives listed.

Q: Do all substitute parts have the same RoHS and REACH compliance?

A: Yes. All active substitute parts listed carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original part. Moisture sensitivity level (MSL 1, unlimited) is consistent across all variants, eliminating compliance risk during substitution.

Q: Which substitute offers the best inventory availability?

A: SN74ABT244APWR (Texas Instruments) provides the highest inventory at 17,100 units in stock. For immediate procurement needs, this part offers the most reliable supply. 74ABT244PW,118 (Nexperia) and SN74ABT244ADBR (Texas Instruments) also maintain substantial inventory levels (5,964 and 4,200 units respectively).

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