SN74LS266DRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS266DRG4 is a 4-channel XNOR (Exclusive NOR) logic gate IC with open collector output configuration, housed in a 14-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent parts to maintain design continuity and ensure long-term component availability for production and maintenance applications.

Substiute Parts

SN74LS266DRG4

Texas InstrumentsIn Stock: 1073SN74LS266DRG4 Datasheet

Current PartRFQ

SN74LS266D

Texas InstrumentsIn Stock: 1399SN74LS266D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS266DRG4 is determined by strict equivalence across the following critical parameters:

• Logic function: XNOR (Exclusive NOR) with 4 channels and 2 inputs per channel
• Output configuration: Open collector topology
• Supply voltage range: 4.75V ~ 5.25V
• Input logic thresholds: Low 0.8V, High 2V
• Propagation delay: 30ns @ 5V, 15pF maximum
• Package type: 14-SOIC surface mount
• Thermal operating range: 0°C ~ 70°C
• Compliance certifications: ROHS3, MSL Level 1

The SN74LS266D qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status: SN74LS266D is active, whereas SN74LS266DRG4 is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS266D is the direct equivalent for the obsolete SN74LS266DRG4. Both components share identical electrical characteristics, timing specifications, and package geometry. The SN74LS266D maintains active product status with full ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and supply chain requirements.

Selection of SN74LS266D over SN74LS266DRG4 is justified by product lifecycle considerations: the substitute part is actively manufactured and supported by Texas Instruments, eliminating obsolescence risk and ensuring consistent availability for new production builds and field replacements.

Frequently Asked Questions (FAQ)

Q: Can SN74LS266D be used as a direct replacement for SN74LS266DRG4 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The SN74LS266D operates within the same supply voltage range (4.75V ~ 5.25V), maintains identical input logic thresholds, and delivers the same propagation delay characteristics. The 14-SOIC package footprint is identical, requiring no PCB layout modifications.

Q: What is the primary difference between these two part numbers?

A: The SN74LS266DRG4 is classified as obsolete, while SN74LS266D is an active product. Both are manufactured by Texas Instruments with identical specifications. The difference reflects product lifecycle status only.

Q: Are there any compliance or certification differences?

A: No. Both parts carry ROHS3 compliance and MSL Level 1 rating. Moisture sensitivity and environmental compliance are equivalent.

Q: Does the packaging differ between these parts?

A: Both components use 14-SOIC surface mount packaging with identical dimensions (0.154" width, 3.90mm). Standard pick-and-place equipment and reflow processes apply to both parts without modification.

Q: What is the current-carrying capacity of the output stage?

A: Both parts specify 8mA maximum output low current with open collector configuration. Pull-up resistor selection should account for this specification in circuit design.