DM74AS08MX Equivalent & Substitute Parts

Part Overview

The DM74AS08MX is a 4-channel 2-input AND gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for standard TTL logic applications requiring AND gate functionality.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	2mA, 20mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	5.5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74AS
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DM74AS08MX are qualified based on strict electrical and mechanical parameter matching within the 74AS logic series. All substitute candidates maintain identical functional specifications: 4-channel AND gate configuration, 2 inputs per channel, 4.5V to 5.5V supply voltage operation, 2mA/20mA output current ratings, and 5.5ns maximum propagation delay at 5V with 50pF load.

Substitution eligibility is determined by the following critical parameters:

Logic Type: AND Gate (4 channels, 2 inputs per channel)
Voltage - Supply: 4.5V ~ 5.5V
Current - Output High, Low: 2mA, 20mA
Input Logic Level - Low: 0.8V
Input Logic Level - High: 2V
Max Propagation Delay @ V, Max CL: 5.5ns @ 5V, 50pF
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
Series: 74AS
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are categorized as direct manufacturer equivalents (SN74AS08D), similar parts with alternative packaging (SN74AS08NSR), and parametric equivalents (SN74AS08DR), all manufactured by Texas Instruments.

Parameter Comparison

Parameter	DM74AS08MX (onsemi)	SN74AS08D (TI)	SN74AS08NSR (TI)	SN74AS08DR (TI)
Logic Type	AND Gate	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4	4
Number of Inputs	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	2mA, 20mA	2mA, 20mA	2mA, 20mA	2mA, 20mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	5.5ns @ 5V, 50pF	5.5ns @ 5V, 50pF	5.5ns @ 5V, 50pF	5.5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Supplier Device Package	14-SOIC	14-SOIC	14-SO	14-SOIC
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.154", 3.90mm Width)
Series	74AS	74AS	74AS	74AS
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the DM74AS08MX, the SN74AS08NSR and SN74AS08DR are preferred substitutes due to their active product status and ROHS3 compliance certification. Both parts maintain full electrical and functional equivalence to the original component.

The SN74AS08D is classified as Last Time Buy, indicating limited future availability and is suitable only for legacy system maintenance or final production runs of existing designs.

The SN74AS08NSR is supplied in Tape & Reel packaging with a 14-SO case measuring 0.209" width, differing from the standard 14-SOIC (0.154" width) package. This dimensional variation requires verification of PCB footprint compatibility before implementation.

The SN74AS08DR is supplied in Cut Tape packaging with the standard 14-SOIC (0.154" width) case, maintaining identical mechanical compatibility with the original DM74AS08MX footprint.

All substitute parts operate within the identical electrical specification range and are suitable for direct pin-for-pin replacement in 74AS logic applications.

Frequently Asked Questions (FAQ)

Q: Can SN74AS08NSR be used as a direct replacement for DM74AS08MX on existing PCBs?

A: The SN74AS08NSR maintains full electrical equivalence but differs in package case width (0.209" versus 0.154"). PCB footprint compatibility must be verified before implementation. If the PCB is designed for the standard 14-SOIC (0.154") footprint, the SN74AS08DR is the appropriate substitute.

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

A: All three parts (SN74AS08D, SN74AS08NSR, SN74AS08DR) are electrically identical 74AS08 AND gate ICs. The differences are packaging format and product status. SN74AS08D uses Tube packaging and is Last Time Buy. SN74AS08NSR uses Tape & Reel packaging with a wider case (0.209"). SN74AS08DR uses Cut Tape packaging with the standard case width (0.154").

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74AS08D, SN74AS08NSR, and SN74AS08DR are all ROHS3 compliant. The original DM74AS08MX RoHS status is not specified in the provided data.

Q: Can these parts be used interchangeably in new designs?

A: SN74AS08NSR and SN74AS08DR are suitable for new designs due to their active product status. SN74AS08D is Last Time Buy and should not be selected for new designs. Package case width differences must be considered for PCB layout compatibility.

Q: What is the operating temperature range for all parts?

A: All parts operate within the 0°C to 70°C temperature range, maintaining identical thermal specifications.

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