DM74ALS244ASJX Equivalent & Substitute Parts

Part Overview

The DM74ALS244ASJX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates within the 74ALS logic family and is housed in a 20-SOP package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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)
Mounting Type	Surface Mount
Series	74ALS
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS244ASJX are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical Parameters, Package Variation): Parts SN74ALS244C-1DW, SN74ALS244C-1DWR, SN74ALS244CDW, and SN74ALS244CDWR maintain all critical electrical specifications: 2 elements, 4 bits per element, 3-state output, 15mA/24mA output current, 4.5V–5.5V supply voltage, and 0°C–70°C operating temperature. These parts differ only in packaging format (Tube, Tape & Reel, or Cut Tape) and manufacturer (Texas Instruments). Package/case dimensions vary between 20-SOIC (0.295", 7.50mm Width) for TI variants and 20-SOIC (0.209", 5.30mm Width) for the original onsemi part.

Parametric Equivalents (Identical Electrical Parameters, Different Package Type): Parts SN74ALS241CNSR, SN74ALS244C-1NSR, and SN74ALS244CNSR maintain all electrical specifications but use 20-SO packaging (0.209", 5.30mm Width) instead of 20-SOP. These parts are functionally equivalent at the circuit level but require PCB layout adjustment due to package footprint differences.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (High/Low)	Supply Voltage	Temp Range	Package/Case	Product Status
DM74ALS244ASJX	onsemi	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.209", 5.30mm)	Obsolete
SN74ALS244C-1DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295", 7.50mm)	Last Time Buy
SN74ALS244C-1DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295", 7.50mm)	Active
SN74ALS244CDW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295", 7.50mm)	Last Time Buy
SN74ALS244CDWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.295", 7.50mm)	Active
SN74ALS241CNSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.209", 5.30mm)	Discontinued at DiGi Electronics
SN74ALS244C-1NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.209", 5.30mm)	Active
SN74ALS244CNSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15mA, 24mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC (0.209", 5.30mm)	Active

Engineering Selection Recommendations

For new designs and ongoing production, SN74ALS244C-1DWR and SN74ALS244CDWR are the preferred substitutes. Both parts are manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. Both are ROHS3 compliant and carry identical electrical specifications to the DM74ALS244ASJX.

SN74ALS244C-1DWR and SN74ALS244CDWR differ only in packaging format: SN74ALS244C-1DWR is supplied in Tape & Reel format, while SN74ALS244CDWR is supplied in Cut Tape & Digi-Reel format. Selection between these two depends on procurement volume and assembly line requirements.

For applications where the original 20-SOIC (0.209", 5.30mm Width) footprint must be maintained without PCB redesign, SN74ALS244C-1NSR and SN74ALS244CNSR provide parametric equivalence with identical package dimensions. Both parts are Active status and ROHS3 compliant.

SN74ALS244C-1DW and SN74ALS244CDW carry Last Time Buy status and should be avoided for new designs requiring extended product lifecycle support.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS244C-1DWR be used as a direct replacement for DM74ALS244ASJX without circuit modification?

A: Yes, electrically. All functional parameters are identical: 2 elements, 4 bits per element, 3-state output, 15mA/24mA output current, 4.5V–5.5V supply voltage, and 0°C–70°C operating temperature. However, the package footprint differs. SN74ALS244C-1DWR uses 20-SOIC (0.295", 7.50mm Width), while DM74ALS244ASJX uses 20-SOIC (0.209", 5.30mm Width). PCB layout modification is required.

Q: What is the difference between SN74ALS244C-1DWR and SN74ALS244CDWR?

A: Both parts are electrically and mechanically identical. The difference is packaging format: SN74ALS244C-1DWR is supplied in Tape & Reel, while SN74ALS244CDWR is supplied in Cut Tape & Digi-Reel. Selection depends on assembly process requirements and order quantity.

Q: Can I use SN74ALS244C-1NSR or SN74ALS244CNSR without PCB redesign?

A: Yes. Both parts maintain the original 20-SOIC (0.209", 5.30mm Width) package footprint, allowing direct PCB compatibility. All electrical parameters match the DM74ALS244ASJX.

Q: Why is DM74ALS244ASJX listed as obsolete?

A: The part has reached end-of-life status with onsemi. Equivalent parts from Texas Instruments in the 74ALS logic family provide identical functionality and are actively manufactured.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitutes listed carry ROHS3 compliance. The original DM74ALS244ASJX REACH status is unaffected, as is all substitute parts.

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

A: Both designations refer to 20-pin surface-mount packages. The distinction in this product line relates to manufacturer-specific naming conventions. Electrical and thermal performance are equivalent. Physical footprint dimensions must be verified against PCB design requirements.

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