SN74LS02DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS02DG4 is a NOR Gate IC with 4 channels and 2 inputs per channel, packaged in a 14-SOIC surface mount configuration. Manufactured by Texas Instruments, this logic component operates within the 4.75V to 5.25V supply voltage range and is designed for standard TTL logic applications. The part is currently in Last Time Buy status, indicating limited availability and the necessity to identify equivalent alternatives for ongoing production and maintenance requirements.

Substiute Parts

SN74LS02DG4

Texas InstrumentsIn Stock: 873SN74LS02DG4 Datasheet

Current PartRFQ

SN74LS02D

onsemiIn Stock: 3645SN74LS02D Datasheet

MFR RecommendedRFQ

SN74LS02DR

Texas InstrumentsIn Stock: 35274SN74LS02DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS02DG4 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Parameters (Must Match):

• Logic Type: NOR Gate
• Number of Circuits: 4
• Number of Inputs: 2
• Voltage - Supply: 4.75V ~ 5.25V
• Current - Output High, Low: 400µA, 16mA
• Input Logic Level - Low: 0.8V
• Input Logic Level - High: 2V
• Max Propagation Delay @ V, Max CL: 15ns @ 5V, 15pF
• Operating Temperature: 0°C ~ 70°C (TA)

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.154", 3.90mm Width)

Acceptable Variations:

• Manufacturer (different suppliers of the same base product)
• Packaging format (Tube vs. Tape & Reel)
• Product Status (Active, Obsolete, or Last Time Buy)
• RoHS Compliance status (ROHS3 Compliant or RoHS non-compliant)

Parameter Comparison

Engineering Selection Recommendations

SN74LS02DR (Texas Instruments, Tape & Reel): This substitute is the primary choice for new designs and ongoing production. It maintains full electrical and mechanical compatibility with the SN74LS02DG4 while offering Active product status, ensuring long-term availability. ROHS3 compliance and MSL Level 1 rating align with modern manufacturing standards. The Tape & Reel packaging format is suitable for automated assembly processes with high-volume production requirements.

SN74LS02D (onsemi, Tube): This substitute provides electrical and mechanical equivalence but carries Obsolete product status and RoHS non-compliance. It is suitable only for legacy system maintenance or applications where RoHS compliance is not a requirement. The Tube packaging format is appropriate for lower-volume or manual assembly operations.

Frequently Asked Questions (FAQ)

Q: Can SN74LS02DR be used as a direct replacement for SN74LS02DG4? A: Yes. Both parts share identical electrical specifications (NOR Gate, 4 channels, 2 inputs, 4.75V–5.25V supply, 15ns propagation delay) and the same 14-SOIC package. The difference is packaging format (Tape & Reel vs. Tube) and product status (Active vs. Last Time Buy).

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging is used for manual or low-volume assembly, while Tape & Reel packaging is designed for automated pick-and-place assembly systems. Both formats contain the same component in the same 14-SOIC package.

Q: Is SN74LS02D compatible with the SN74LS02DG4? A: Electrically and mechanically, yes. However, SN74LS02D is marked as Obsolete and is RoHS non-compliant. Use only if RoHS compliance is not required and availability is confirmed.

Q: Why is RoHS compliance important for substitution? A: RoHS compliance indicates the absence of restricted substances (lead, cadmium, mercury, etc.). ROHS3-compliant parts meet current environmental and regulatory standards. Non-compliant parts may face restrictions in certain markets or applications.

Q: Can these parts be used interchangeably in the same PCB layout? A: Yes. All three parts use the 14-SOIC package with identical pin configuration and spacing (0.154" width, 3.90mm). PCB footprints and solder reflow profiles remain unchanged.

Q: What does "Last Time Buy" status mean for the main part? A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Existing inventory is available, but future availability is not guaranteed. Substitution to Active-status parts is necessary for long-term supply chain planning.