DM74ALS244ASJ Equivalent & Substitute Parts

Part Overview

The DM74ALS244ASJ is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOP package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74ALS244ASJ
Manufacturer	onsemi
Series	74ALS
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)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DM74ALS244ASJ is determined by strict equivalence across the following electrical and mechanical parameters:

Logic type: Buffer, Non-Inverting
Number of elements: 2
Number of bits per element: 4
Output type: 3-State
Current ratings: 15mA (high), 24mA (low)
Supply voltage range: 4.5V ~ 5.5V
Operating temperature: 0°C ~ 70°C
Mounting type: Surface Mount
Base product number: 74ALS244
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories based on package configuration: 20-SO (0.209" width) and 20-SOIC (0.295" width). Both package types maintain electrical equivalence while differing in physical dimensions and supplier packaging formats.

Parameter Comparison

Parameter	DM74ALS244ASJ (onsemi)	SN74ALS244CNSR (TI)	SN74ALS244C-1DW (TI)	SN74ALS244C-1DWR (TI)	SN74ALS244C-1NSR (TI)	SN74ALS244CDW (TI)	SN74ALS244CDWR (TI)
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 24mA	15mA, 24mA	15mA, 24mA	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	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)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Last Time Buy	Active	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All Texas Instruments substitute parts listed maintain full electrical and functional equivalence to the DM74ALS244ASJ. Selection among available substitutes should be based on the following criteria:

Product Status Priority: SN74ALS244CNSR, SN74ALS244C-1DWR, SN74ALS244C-1NSR, and SN74ALS244CDWR are classified as Active, ensuring long-term availability and supply continuity. SN74ALS244C-1DW and SN74ALS244CDW are designated Last Time Buy, indicating limited future availability.

Compliance Status: All Texas Instruments substitutes are ROHS3 Compliant, meeting current environmental and regulatory requirements. The original onsemi part does not specify RoHS compliance status.

Package Configuration: Parts with 20-SOIC (0.209", 5.30mm width) packaging—SN74ALS244CNSR, SN74ALS244C-1NSR—maintain identical physical dimensions to the original DM74ALS244ASJ. Parts with 20-SOIC (0.295", 7.50mm width) packaging—SN74ALS244C-1DW, SN74ALS244C-1DWR, SN74ALS244CDW, SN74ALS244CDWR—require PCB layout verification due to increased package width.

Packaging Format: Selection between Cut Tape (CT), Tube, and Tape & Reel (TR) formats depends on assembly process requirements and order quantities.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS244CNSR directly replace DM74ALS244ASJ without PCB modifications?

A: Yes. SN74ALS244CNSR maintains identical electrical specifications and package dimensions (20-SOIC, 0.209" width), enabling direct substitution without PCB layout changes.

Q: What is the difference between 20-SO and 20-SOIC package designations?

A: Both designations refer to 20-pin Small Outline packages. The primary distinction is package width: 0.209" (5.30mm) versus 0.295" (7.50mm). Wider packages require verification of PCB pad spacing and component placement clearances.

Q: Are the Texas Instruments substitutes electrically identical to the onsemi original?

A: Yes. All listed Texas Instruments parts (SN74ALS244 series) maintain identical logic type, element count, bit configuration, output type, current ratings, supply voltage range, and operating temperature specifications as the DM74ALS244ASJ.

Q: Why is the DM74ALS244ASJ classified as obsolete?

A: Obsolescence reflects onsemi's discontinuation of this part number. Active alternatives from Texas Instruments provide equivalent functionality and ensure design continuity.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT), Tube, and Tape & Reel (TR) formats represent supplier packaging only and do not alter electrical characteristics or functional performance.

Q: What compliance certifications apply to substitute parts?

A: All Texas Instruments substitutes are ROHS3 Compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements for electronic components.

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