DM74ALS244AMSA Equivalent & Substitute Parts

Part Overview

The DM74ALS244AMSA is a non-inverting buffer IC with 2 elements, 4 bits per element, and 3-state output capability, manufactured by onsemi in a 20-SSOP surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74ALS logic family provides standard TTL-compatible buffering functionality with specified electrical performance across the 4.5V to 5.5V supply voltage range.

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	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DM74ALS244AMSA is determined by strict equivalence across the following parameters:

Logic family and function: Buffer, Non-Inverting
Element and bit configuration: 2 elements, 4 bits per element
Output configuration: 3-State output
Electrical performance: Current ratings (15mA high, 24mA low) and supply voltage range (4.5V ~ 5.5V)
Package specification: 20-SSOP surface mount with identical physical dimensions
Operating temperature range: 0°C ~ 70°C

All substitute parts listed maintain identical specifications across these parameters. Substitutes are grouped by product status and packaging format, with direct manufacturer equivalents prioritized for active production applications.

Parameter Comparison

Parameter	DM74ALS244AMSA (onsemi)	SN74ALS244CDBR (TI)	SN74ALS244C-1DB (TI)	SN74ALS244C-1DBR (TI)
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 24mA	15mA, 24mA	15mA, 24mA	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For new designs and production applications, Texas Instruments SN74ALS244CDBR is the primary substitute for the obsolete DM74ALS244AMSA. This part maintains active product status, carries ROHS3 compliance certification, and is available in standard cut tape and Digi-Reel packaging formats suitable for high-volume manufacturing.

The SN74ALS244C-1DB and SN74ALS244C-1DBR variants are functionally equivalent alternatives, also manufactured by Texas Instruments with active status and ROHS3 compliance. These parts provide identical electrical and mechanical specifications and are suitable for applications where packaging format flexibility is required.

All three Texas Instruments substitutes are pin-compatible and functionally interchangeable with the original DM74ALS244AMSA, with no circuit modifications required for direct replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS244CDBR be used as a direct replacement for DM74ALS244AMSA?

A: Yes. The SN74ALS244CDBR is electrically and mechanically equivalent. All key parameters including logic function, element configuration, output type, current ratings, supply voltage range, operating temperature, and 20-SSOP package dimensions are identical. No circuit modifications are required.

Q: What is the difference between SN74ALS244CDBR, SN74ALS244C-1DB, and SN74ALS244C-1DBR?

A: All three parts are functionally identical with matching electrical specifications and 20-SSOP packaging. The primary differences are in packaging format and availability. SN74ALS244CDBR is supplied in cut tape and Digi-Reel formats for production environments. SN74ALS244C-1DB and SN74ALS244C-1DBR are alternative variants with the same core specifications.

Q: Why is the DM74ALS244AMSA listed as obsolete?

A: The DM74ALS244AMSA has been discontinued by onsemi. Active equivalents from Texas Instruments ensure continued availability and support for this logic function in new and existing applications.

Q: Are there any compliance differences between the original part and substitutes?

A: The original DM74ALS244AMSA is REACH Unaffected. All Texas Instruments substitutes (SN74ALS244CDBR, SN74ALS244C-1DB, SN74ALS244C-1DBR) are ROHS3 Compliant, providing enhanced environmental compliance for modern manufacturing and end-use requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts share identical pin configurations, electrical characteristics, and 20-SSOP package dimensions. Direct PCB substitution is possible without design modifications.

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