SN74LS26DE4 Equivalent & Substitute Parts

Part Overview

The SN74LS26DE4 is a NAND Gate IC with 4 channels and 2 inputs per channel, featuring open collector output configuration in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this component operates within the 74LS logic family and is currently in Last Time Buy status. Due to its end-of-life designation, identifying functionally equivalent substitute parts is necessary for ongoing design support and procurement planning.

Substiute Parts

SN74LS26DE4

Texas InstrumentsIn Stock: 1114SN74LS26DE4 Datasheet

Current PartRFQ

SN74LS38D

onsemiIn Stock: 43652SN74LS38D Datasheet

DirectRFQ

SN74LS26D

MotorolaIn Stock: 8528SN74LS26D Datasheet

MFR RecommendedRFQ

SN74LS26DR

Texas InstrumentsIn Stock: 7581SN74LS26DR Datasheet

MFR RecommendedRFQ

SN74LS03D

Texas InstrumentsIn Stock: 1575SN74LS03D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS26DE4 are qualified based on the following criteria:

Core Functional Parameters (Must Match):

• Logic Type: NAND Gate
• Number of Circuits: 4
• Number of Inputs: 2
• Features: Open Collector
• Voltage - Supply: 4.75V ~ 5.25V
• Input Logic Level - Low: 0.8V
• Input Logic Level - High: 2V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Allowable Variations:

• Current - Output High, Low: Variations permitted within functional range
• Max Propagation Delay @ V, Max CL: Variations permitted within functional range
• Manufacturer: Different manufacturers acceptable
• Packaging Format: Tube or Tape & Reel acceptable
• Product Status: Active, Obsolete, or Last Time Buy acceptable
• RoHS Compliance: Variations permitted

Parameter Comparison

Engineering Selection Recommendations

SN74LS26DR (Recommended Primary Substitute)

The SN74LS26DR is the preferred substitute for the SN74LS26DE4. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain ROHS3 compliance. The SN74LS26DR carries Active product status, ensuring long-term availability and supply chain stability. The only difference is packaging format: SN74LS26DR is supplied in Tape & Reel format versus the original Tube format. This substitution requires no design modifications.

SN74LS26D (Secondary Substitute)

The SN74LS26D is functionally equivalent with matching electrical parameters and identical 14-SOIC package dimensions. Manufactured by Motorola, this part is in Obsolete status and carries RoHS non-compliance designation. Selection of this substitute should account for regulatory and supply availability constraints.

SN74LS03D (Functional Equivalent with Output Current Variation)

The SN74LS03D maintains core NAND gate functionality with identical logic configuration and timing specifications. Output current characteristics differ: SN74LS03D specifies 250µA high and 16mA low versus the main part's 8mA low specification. This part is ROHS3 compliant and in Last Time Buy status. Output current variation must be evaluated against circuit load requirements.

SN74LS38D (Functional Equivalent with Output Current and Load Variation)

The SN74LS38D provides NAND gate functionality with higher output current capacity (24mA low) and increased load capacitance rating (45pF versus 15pF). Manufactured by onsemi, this part is RoHS non-compliant and in Obsolete status. The increased electrical specifications may accommodate higher fan-out applications but require circuit validation.

Frequently Asked Questions (FAQ)

Q: Can SN74LS26DR be used as a direct replacement for SN74LS26DE4?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, logic configuration, and package dimensions. The difference is packaging format: SN74LS26DR uses Tape & Reel while SN74LS26DE4 uses Tube. No circuit modifications are required.

Q: What is the difference between SN74LS26D and SN74LS26DR?

A: Both parts share identical electrical specifications and are based on the 74LS26 base product number. The primary difference is packaging format: SN74LS26D is supplied in Tube, while SN74LS26DR is supplied in Tape & Reel. SN74LS26DR is currently Active, while SN74LS26D is Obsolete.

Q: Why does SN74LS03D have different output current specifications?

A: SN74LS03D is a different base product number (74LS03) within the 74LS NAND gate family. While it maintains the same logic function, circuit configuration, and package, output current characteristics differ. This variation must be evaluated against specific circuit load requirements before substitution.

Q: Is SN74LS38D a suitable substitute?

A: SN74LS38D is functionally equivalent as a NAND gate with identical logic configuration and timing. However, it features higher output current capacity (24mA versus 8mA) and increased load capacitance rating (45pF versus 15pF). These differences indicate a different internal design. Substitution is acceptable where higher drive capability is beneficial or neutral to circuit operation.

Q: What are the RoHS compliance implications for substitute selection?

A: SN74LS26DE4, SN74LS26DR, and SN74LS03D are ROHS3 compliant. SN74LS26D and SN74LS38D are RoHS non-compliant. Regulatory requirements and supply chain policies must determine whether RoHS non-compliant substitutes are acceptable for your application.

Q: Are all substitute parts available in 14-SOIC package?

A: Yes. All substitute parts listed are available in 14-SOIC (0.154", 3.90mm Width) surface mount package, maintaining mechanical compatibility with the original SN74LS26DE4.