DM74ALS244AMSAX Equivalent & Substitute Parts

Part Overview

The DM74ALS244AMSAX is a Buffer, Non-Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SSOP surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74ALS logic family provides standard buffering functionality with TTL-compatible voltage levels and output drive specifications suitable for digital signal distribution and bus interface applications.

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
Series	74ALS

Substitute Part Grouping Explanation

Substitution for the DM74ALS244AMSAX is determined by strict equivalence across the following critical parameters:

Logic function: Buffer, Non-Inverting configuration
Element and bit architecture: 2 elements, 4 bits per element
Output characteristics: 3-state output with matching current specifications (15mA high, 24mA low)
Electrical performance: 4.5V to 5.5V supply voltage range
Thermal operating range: 0°C to 70°C
Physical form factor: 20-SSOP package with identical 5.30mm width
Surface mount compatibility

All substitute parts listed maintain identical functional and electrical specifications. The primary distinction between substitutes is manufacturer identity and product status (active vs. obsolete).

Parameter Comparison

Parameter	DM74ALS244AMSAX (onsemi)	SN74ALS244C-1DB (TI)	SN74ALS244C-1DBR (TI)	SN74ALS244CDBR (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
Series	74ALS	74ALS	74ALS	74ALS
Product Status	Obsolete	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three Texas Instruments substitutes (SN74ALS244C-1DB, SN74ALS244C-1DBR, and SN74ALS244CDBR) are functionally and electrically equivalent to the DM74ALS244AMSAX. Selection among these options should be based on:

Product Status: The Texas Instruments parts carry Active product status, ensuring continued availability and manufacturing support, whereas the original onsemi part is obsolete.

Compliance: All Texas Instruments substitutes are ROHS3 compliant, meeting modern environmental and regulatory requirements. The original part maintains REACH Unaffected status.

Packaging and Availability: SN74ALS244CDBR is supplied in Cut Tape (CT) and Digi-Reel® packaging with the highest inventory level (2371 pcs), making it the preferred choice for volume applications. SN74ALS244C-1DB and SN74ALS244C-1DBR are available in prototype quantities with lower stock levels.

Pinout and PCB Compatibility: All substitutes maintain identical 20-SSOP package geometry and pin configuration, enabling direct board-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS244CDBR be used as a direct replacement for DM74ALS244AMSAX?

A: Yes. Both parts are electrically and functionally identical across all specified parameters: logic function, element count, bit configuration, output type, current ratings, supply voltage, operating temperature, and package form factor. Direct substitution is supported without circuit modifications.

Q: What is the difference between the three Texas Instruments substitutes?

A: The three parts are electrically identical. The primary differences are packaging format and inventory availability. SN74ALS244CDBR is supplied in Cut Tape and Digi-Reel format with higher stock levels. SN74ALS244C-1DB and SN74ALS244C-1DBR are designated as prototype parts with lower inventory quantities.

Q: Does the obsolete status of DM74ALS244AMSAX affect compatibility with active substitutes?

A: No. Obsolete status indicates the original manufacturer has discontinued production, not that the part is incompatible with active equivalents. The electrical and functional specifications remain valid. Active substitutes provide the same performance with assured future availability.

Q: Are there any package or pinout differences between these parts?

A: No. All parts use the identical 20-SSOP package with 5.30mm width and maintain the same pin configuration. PCB layouts and footprints are fully compatible.

Q: Which substitute should be selected for new designs?

A: SN74ALS244CDBR is recommended for new designs due to active product status, ROHS3 compliance, and superior availability in standard packaging formats.

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