DM74LS09N Equivalent & Substitute Parts

Part Overview

The DM74LS09N is a 4-channel AND gate logic IC with open collector output, manufactured by onsemi in a 14-MDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The open collector configuration allows for wired-AND logic applications and compatibility with various voltage levels through external pull-up resistors.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Features	Open Collector
Voltage - Supply	4.75V ~ 5.25V
Current - Output Low	8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	45ns
Operating Temperature	0°C ~ 70°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DM74LS09N is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be 4-channel AND gates with 2 inputs per channel, maintaining the same logic function.

Package Compatibility: The 14-DIP (0.300", 7.62mm) through-hole package is the primary mechanical constraint. Substitutes must use identical or pin-compatible packages.

Open Collector Output: The DM74LS09N features open collector output. Substitutes are grouped into two categories:

Direct Equivalents (Open Collector): SN74LS09N maintains the open collector architecture and identical electrical specifications.
Functional Equivalents (Standard Output): SN74AHC08N provides AND gate functionality with standard CMOS output, suitable for applications where open collector is not required.

Voltage Supply Range: The DM74LS09N operates within 4.75V ~ 5.25V. Substitutes must support this range or provide broader compatibility.

Electrical Performance: Output current capability (8mA minimum), propagation delay, and input logic levels determine functional compatibility in specific circuit applications.

Parameter Comparison

Parameter	DM74LS09N (onsemi)	SN74LS09N (Texas Instruments)	SN74AHC08N (Texas Instruments)
Logic Type	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4
Number of Inputs	2	2	2
Features	Open Collector	Open Collector	Standard Output
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	2V ~ 5.5V
Current - Output Low	8mA	8mA	8mA
Input Logic Level - Low	0.8V	0.8V	0.5V ~ 1.65V
Input Logic Level - High	2V	2V	1.5V ~ 3.85V
Max Propagation Delay @ 5V	45ns @ 50pF	35ns @ 15pF	7.9ns @ 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: SN74LS09N (Texas Instruments)

The SN74LS09N is the direct functional equivalent of the DM74LS09N. Both components are 74LS series AND gates with open collector output, identical electrical specifications, and the same 14-DIP package. The SN74LS09N is currently in active production status with ROHS3 compliance, making it the preferred choice for designs requiring open collector functionality. This substitute maintains full pin and functional compatibility with the obsolete DM74LS09N.

Secondary Substitute: SN74AHC08N (Texas Instruments)

The SN74AHC08N provides AND gate logic in the same 14-DIP package but with standard CMOS output instead of open collector. This substitute is suitable for applications where open collector output is not required. The SN74AHC08N offers superior performance characteristics including faster propagation delay (7.9ns vs. 45ns), broader supply voltage range (2V ~ 5.5V), and extended operating temperature range (-40°C ~ 125°C). Both substitutes are ROHS3 compliant and actively produced.

Compliance Considerations: Both substitute parts are ROHS3 compliant, whereas the original DM74LS09N is RoHS non-compliant. This compliance improvement supports modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can SN74LS09N directly replace DM74LS09N in existing designs?

A: Yes. The SN74LS09N is a direct substitute with identical pin configuration, electrical specifications, and open collector output. No circuit modifications are required for this substitution.

Q: What is the difference between SN74LS09N and SN74AHC08N?

A: The primary difference is output architecture. SN74LS09N features open collector output, while SN74AHC08N has standard CMOS output. Open collector output allows multiple gates to be wired together for AND logic. SN74AHC08N cannot be used in applications requiring open collector functionality. Additionally, SN74AHC08N offers faster propagation delay and broader voltage range.

Q: Is the 14-DIP package identical across all three parts?

A: Yes. All three parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin spacing and mechanical dimensions, ensuring direct board-level compatibility.

Q: Can SN74AHC08N be used where open collector output is required?

A: No. SN74AHC08N has standard CMOS output and cannot provide the open collector functionality needed for wired-AND applications. SN74LS09N must be used for open collector requirements.

Q: What are the supply voltage constraints for each substitute?

A: DM74LS09N and SN74LS09N both require 4.75V ~ 5.25V supply voltage. SN74AHC08N accepts broader range of 2V ~ 5.5V, providing greater flexibility in mixed-voltage systems.

Q: Are both substitutes RoHS compliant?

A: Yes. Both SN74LS09N and SN74AHC08N are ROHS3 compliant. The original DM74LS09N is RoHS non-compliant.

Q: Which substitute offers better performance?

A: SN74AHC08N provides superior performance with 7.9ns propagation delay compared to 45ns for DM74LS09N and 35ns for SN74LS09N. However, performance selection depends on application requirements and whether open collector output is necessary.

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