DM74LS02N NOR Gate IC Equivalent & Substitute Parts

Part Overview

The DM74LS02N is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in a 14-MDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The SN74LS02N from Texas Instruments serves as a direct functional equivalent, offering active product status and improved compliance characteristics while maintaining electrical and mechanical compatibility.

Substiute Parts

DM74LS02N

onsemiIn Stock: 5148DM74LS02N Datasheet

Current PartRFQ

SN74LS02N

Texas InstrumentsIn Stock: 8747SN74LS02N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS02N with the SN74LS02N is valid based on the following criteria:

Electrical Compatibility:

• Identical logic type (NOR Gate), circuit count (4), and input configuration (2-input)
• Matching supply voltage range (4.75V ~ 5.25V)
• Identical input logic thresholds (Low: 0.8V, High: 2V)
• Overlapping operating temperature range (0°C ~ 70°C)

Mechanical Compatibility:

• Both use 14-DIP through-hole package with identical pitch (0.300", 7.62mm)
• Pin-for-pin compatible layout

Product Status:

• DM74LS02N is obsolete; SN74LS02N is active, ensuring long-term availability

Parameter Comparison

Engineering Selection Recommendations

The SN74LS02N from Texas Instruments is the appropriate substitute for the obsolete DM74LS02N. Selection is based on:

Product Status: The DM74LS02N is obsolete, while the SN74LS02N maintains active status, ensuring availability for current and future production requirements.

Electrical Performance: The SN74LS02N demonstrates equivalent or superior electrical characteristics. Output low current is higher (16mA vs. 8mA), and propagation delay is faster (15ns vs. 18ns), both favorable for circuit performance.

Compliance: The SN74LS02N is ROHS3 compliant, whereas the DM74LS02N is non-compliant. This distinction is significant for applications subject to RoHS regulations.

Mechanical Compatibility: Both parts use identical 14-DIP through-hole packaging with matching pin configurations, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS02N directly replace the DM74LS02N on existing PCBs?

A: Yes. Both parts use the 14-DIP through-hole package with identical pin pitch (0.300", 7.62mm) and pin configuration. No PCB modifications are required.

Q: Are the electrical specifications compatible between these parts?

A: Yes. Supply voltage range, input logic thresholds, and operating temperature are identical. The SN74LS02N exhibits faster propagation delay and higher output low current, both compatible with circuits designed for the DM74LS02N.

Q: What is the significance of the RoHS compliance difference?

A: The SN74LS02N is ROHS3 compliant, while the DM74LS02N is non-compliant. For applications subject to RoHS regulations or customer requirements, the SN74LS02N is the appropriate choice.

Q: Why is the DM74LS02N listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SN74LS02N, maintained in active production by Texas Instruments, provides continuity for designs requiring 74LS02 NOR gate functionality.

Q: Are there packaging differences between these parts?

A: Both parts are supplied in 14-DIP through-hole packages. The DM74LS02N may be supplied in standard packaging, while the SN74LS02N is available in tube packaging. This does not affect electrical or mechanical compatibility.

Q: What output current specifications should be considered for circuit design?

A: The DM74LS02N specifies 400µA output high and 8mA output low. The SN74LS02N specifies 400µA output high and 16mA output low. Circuits designed for the DM74LS02N will operate within specification with the SN74LS02N, as the substitute provides equal or greater current capability.