DM74AS244SJX Equivalent & Substitute Parts

Part Overview

The DM74AS244SJX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-SOP surface mount device operates across a 4.5V to 5.5V supply range and is rated for 0°C to 70°C operating temperature. The part is currently classified 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, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DM74AS244SJX is determined by strict equivalence across the following critical parameters: logic type (non-inverting buffer), element count (2), bits per element (4), output configuration (3-state), output current specifications (15mA high, 64mA low), supply voltage range (4.5V to 5.5V), and operating temperature range (0°C to 70°C). Package form factor variations are permitted within the 20-pin SOIC/SOP family, as these represent equivalent mechanical and electrical footprints suitable for surface mount assembly.

Substitute parts are categorized into two groups:

Direct Substitutes (Same Base Series): SN74AS244ADW and SN74AS244ADWR maintain the 74AS logic family designation with identical electrical specifications and compatible packaging.

Parametric Equivalents (Alternative Logic Families): SN74AS244ANSR, SN74BCT244NSR, SN74F241NSR, and SN74F244NSR provide functionally equivalent performance across all critical electrical parameters while representing different logic family implementations (74AS, 74BCT, 74F series).

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (High/Low)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
DM74AS244SJX	onsemi	74AS	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOP	Obsolete	REACH Unaffected
SN74AS244ADW	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC	Last Time Buy	ROHS3 Compliant
SN74AS244ADWR	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC	Active	ROHS3 Compliant
SN74AS244ANSR	Texas Instruments	74AS	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	Active	ROHS3 Compliant
SN74BCT244NSR	Texas Instruments	74BCT	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	Active	ROHS3 Compliant
SN74F241NSR	Texas Instruments	74F	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	Active	ROHS3 Compliant
SN74F244NSR	Texas Instruments	74F	Buffer, Non-Inverting	2	4	3-State	15mA, 64mA	4.5V ~ 5.5V	0°C ~ 70°C	20-SO	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing procurement, SN74AS244ADWR is the primary recommended substitute. This Texas Instruments part maintains the 74AS logic family lineage, carries Active product status ensuring long-term availability, and is ROHS3 compliant. The tape and reel packaging format supports high-volume manufacturing workflows.

SN74AS244ANSR provides an alternative within the same 74AS family with Active status and ROHS3 compliance, offering equivalent electrical performance with 20-SO packaging.

SN74BCT244NSR and SN74F244NSR represent parametric equivalents from alternative logic families (74BCT and 74F respectively), both maintaining Active product status and ROHS3 compliance. These parts deliver identical electrical specifications and are suitable for applications where logic family interchangeability is acceptable.

SN74AS244ADW carries Last Time Buy status, indicating limited future availability and is suitable only for legacy system maintenance or short-term procurement needs.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AS244ADWR as a direct replacement for DM74AS244SJX?

A: Yes. Both parts share identical electrical specifications across all critical parameters: 2-element, 4-bit non-inverting buffer configuration, 3-state output, 15mA/64mA output current, 4.5V to 5.5V supply range, and 0°C to 70°C operating temperature. The 20-SOIC package is mechanically and electrically compatible with the 20-SOP footprint.

Q: What is the difference between the 74AS, 74BCT, and 74F logic families?

A: These represent different logic family implementations with distinct internal circuit designs and propagation characteristics. However, for this buffer application, all three families deliver identical electrical specifications for the parameters listed. Selection between families depends on system-level timing requirements and compatibility with existing logic families in the design.

Q: Does packaging format affect substitution compatibility?

A: Packaging format (20-SOP, 20-SOIC, 20-SO) represents different mechanical presentations of the same 20-pin surface mount footprint. All variants are compatible for PCB assembly purposes. Verify your assembly equipment specifications for any specific packaging preferences.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitute parts listed carry ROHS3 compliance status. The original onsemi DM74AS244SJX is REACH Unaffected, and all substitutes maintain equivalent environmental compliance.

Q: Which substitute part has the longest product lifecycle?

A: SN74AS244ADWR, SN74AS244ANSR, SN74BCT244NSR, SN74F241NSR, and SN74F244NSR all carry Active product status, indicating ongoing manufacturer support and availability. These are preferred for new designs requiring long-term component sourcing.

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