DM74LS08M AND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74LS08M is a 4-channel 2-input AND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 74LS series AND gate remains functionally relevant in legacy system designs and applications requiring standard TTL logic gate functionality.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.75V ~ 5.25V
Current - Output High, Low	400µA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	18ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74LS
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the DM74LS08M are qualified based on the following criteria:

Electrical Compatibility:

Identical logic type (AND Gate)
Matching circuit count (4 channels)
Matching input count (2 inputs per channel)
Identical supply voltage range (4.75V ~ 5.25V)
Matching output current specifications (400µA, 8mA)
Matching input logic levels (0.8V low, 2V high)
Operating temperature range compatibility (0°C ~ 70°C)

Mechanical Compatibility:

Surface mount mounting type
14-pin SOIC package family (14-SOIC or 14-SO)
Pin-compatible footprints

Functional Compatibility:

74LS series base product number (74LS08)
Propagation delay within acceptable range for TTL logic applications

All substitute parts listed maintain these parameters within the specified tolerances, ensuring direct functional replacement capability.

Parameter Comparison

Parameter	DM74LS08M (Main)	SN74LS08D	SN74LS08DR	SN74LS08NSR
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
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	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output High, Low	400µA, 8mA	400µA, 8mA	400µA, 8mA	400µA, 8mA
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	18ns @ 5V, 50pF	20ns @ 5V, 15pF	20ns @ 5V, 15pF	20ns @ 5V, 15pF
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
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	-	Tube	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitute: SN74LS08D The SN74LS08D from Texas Instruments is the direct equivalent with active product status and ROHS3 compliance. This part maintains identical electrical parameters and 14-SOIC packaging. Tube packaging is suitable for standard component handling and assembly processes.

High-Volume Alternative: SN74LS08DR The SN74LS08DR offers the same electrical and mechanical specifications as SN74LS08D with significantly higher inventory availability (17,650 pcs). Cut Tape and Digi-Reel packaging accommodates automated pick-and-place assembly operations. This option is preferred for production volumes requiring continuous supply.

Tape & Reel Option: SN74LS08NSR The SN74LS08NSR provides Tape & Reel packaging suitable for high-speed automated assembly. Package width is 0.209" (5.30mm) compared to 0.154" (3.90mm) for other variants, requiring verification of PCB footprint compatibility before selection. All electrical parameters remain equivalent.

All substitute parts carry active product status and RoHS3 compliance, addressing the obsolescence of the original DM74LS08M while meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74LS08NSR be used as a direct replacement for DM74LS08M? A: SN74LS08NSR is electrically equivalent but has a different package width (0.209" vs 0.154"). Verify PCB footprint compatibility before substitution. Pin configuration and electrical performance are identical.

Q: What is the difference between SN74LS08D, SN74LS08DR, and SN74LS08NSR? A: All three parts are electrically identical 74LS08 AND gate ICs. The differences are packaging format (Tube, Cut Tape/Digi-Reel, and Tape & Reel respectively) and package width for SN74LS08NSR. Selection depends on assembly process requirements and inventory management.

Q: Why is propagation delay different between DM74LS08M and the substitutes? A: DM74LS08M specifies 18ns at 5V with 50pF load, while substitutes specify 20ns at 5V with 15pF load. Both values are within standard 74LS specifications and functionally compatible for TTL logic applications.

Q: Are all substitute parts RoHS compliant? A: Yes. SN74LS08D, SN74LS08DR, and SN74LS08NSR are all ROHS3 compliant, addressing environmental and regulatory requirements that the obsolete DM74LS08M does not meet.

Q: Which substitute should I choose for new designs? A: For new designs, select based on assembly process: SN74LS08D for manual or low-volume assembly, SN74LS08DR for automated high-volume production, or SN74LS08NSR for high-speed automated assembly with Tape & Reel handling.

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