DM74AS240WMX Equivalent & Substitute Parts

Part Overview

The DM74AS240WMX is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by onsemi in a 20-SOIC surface mount package, this component is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts from active manufacturers is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value
Logic Type	Buffer, 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)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the DM74AS240WMX are qualified based on the following critical parameters:

Logic Type: Buffer, Inverting (identical functional behavior)
Number of Elements: 2 (identical configuration)
Number of Bits per Element: 4 (identical bit width)
Output Type: 3-State (identical output control capability)
Current - Output High, Low: 15mA, 64mA (identical drive capability)
Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
Operating Temperature: 0°C ~ 70°C (TA) (identical operating range)
Package / Case: 20-SOIC (0.295", 7.50mm Width) (identical physical footprint)
Mounting Type: Surface Mount (identical mounting method)

All substitute parts listed maintain 100% parametric equivalence across these dimensions, ensuring direct functional and physical interchangeability.

Parameter Comparison

Parameter	DM74AS240WMX (onsemi)	SN74AS240ADW (TI)	SN74AS240ADWR (TI)	SN74F240DWR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Series	74AS	74AS	74AS	74F
Product Status	Obsolete	Active	Active	Active
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, 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, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA
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-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74AS240ADW (Texas Instruments) and SN74AS240ADWR (Texas Instruments) are direct manufacturer equivalents to the DM74AS240WMX. Both parts are active products from Texas Instruments, carry ROHS3 compliance certification, and maintain identical electrical and mechanical specifications. The primary distinction between these two is packaging format: SN74AS240ADW is supplied in tube packaging, while SN74AS240ADWR is supplied in reel packaging. Selection between these two should be based on procurement and assembly requirements.

SN74F240DWR (Texas Instruments) is a parametric equivalent belonging to the 74F logic series rather than the 74AS series. This part maintains all critical electrical parameters and physical package specifications. The 74F series represents an alternative logic family with comparable performance characteristics. This option is suitable when 74F series components are already established in the design or supply chain.

All three substitute parts are active products with established supply availability and regulatory compliance, making them suitable replacements for the obsolete DM74AS240WMX.

Frequently Asked Questions (FAQ)

Q: Can SN74AS240ADW and SN74AS240ADWR be used interchangeably with DM74AS240WMX?

A: Yes. Both parts are direct manufacturer equivalents with identical electrical specifications, output drive capability, supply voltage range, operating temperature range, and 20-SOIC package footprint. The difference between them is packaging format only (tube vs. reel).

Q: What is the difference between the 74AS and 74F logic series options?

A: Both series maintain the same electrical parameters specified for this application (15mA/64mA output current, 4.5V-5.5V supply, 0°C-70°C operating range). The 74F series is an alternative logic family. Selection depends on design requirements and existing component standardization.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74AS240ADW, SN74AS240ADWR, and SN74F240DWR are all ROHS3 compliant. The original DM74AS240WMX RoHS status was not specified in available documentation.

Q: Can these parts be used in new designs?

A: Yes. All three substitute parts are active products with established supply chains. SN74AS240ADW and SN74AS240ADWR are recommended for direct replacement of the obsolete DM74AS240WMX. SN74F240DWR is suitable when 74F series standardization is preferred.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the original DM74AS240WMX and all substitutes, have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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