SN74LS266DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS266DG4 is a 4-channel XNOR (Exclusive NOR) logic gate IC with open collector outputs in a 14-SOIC surface mount package. This device is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates within a 4.75V to 5.25V supply voltage range and is suitable for digital logic applications requiring XNOR gate functionality.

Substiute Parts

SN74LS266DG4

Texas InstrumentsIn Stock: 1162SN74LS266DG4 Datasheet

Current PartRFQ

SN74LS266D

Texas InstrumentsIn Stock: 1399SN74LS266D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN74LS266D qualifies as a direct substitute for the SN74LS266DG4 based on the following substitution criteria:

Electrical Parameters Match:

• Logic type: XNOR (Exclusive NOR) — identical
• Number of circuits: 4 channels — identical
• Number of inputs: 2 inputs per channel — identical
• Open collector output configuration — identical
• Supply voltage range: 4.75V ~ 5.25V — identical
• Output current rating: 8mA — identical
• Input logic levels: 0.8V (low), 2V (high) — identical
• Propagation delay: 30ns @ 5V, 15pF — identical
• Operating temperature range: 0°C ~ 70°C — identical

Mechanical Parameters Match:

• Package type: 14-SOIC surface mount — identical
• Package dimensions: 0.154" × 3.90mm width — identical

Compliance & Status:

• RoHS3 compliant — both parts
• MSL rating 1 (Unlimited) — both parts
• REACH unaffected — both parts

The primary difference is product status: SN74LS266DG4 is discontinued, while SN74LS266D remains active with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS266D is a direct functional and mechanical equivalent to the SN74LS266DG4. Selection between these parts should be based on the following factors:

Product Availability: The SN74LS266DG4 is discontinued, making the SN74LS266D the appropriate choice for new designs and ongoing production requirements.

Compliance Certification: Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with current manufacturing and environmental standards.

Inventory Status: The SN74LS266D has higher inventory availability (1324 pcs) compared to the SN74LS266DG4 (1108 pcs), supporting supply chain continuity.

Packaging: Both parts use identical 14-SOIC surface mount packaging, eliminating the need for PCB layout modifications or requalification.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS266D directly replace the SN74LS266DG4 without circuit modifications?

A: Yes. The SN74LS266D is electrically and mechanically identical to the SN74LS266DG4. All electrical parameters, logic function, output characteristics, and package dimensions are equivalent. No circuit modifications are required.

Q: What is the difference between SN74LS266DG4 and SN74LS266D?

A: The primary difference is product status and packaging designation. The SN74LS266DG4 is discontinued, while the SN74LS266D remains in active production. Both parts are functionally identical 4-channel XNOR logic gates in 14-SOIC packages with open collector outputs.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts are ROHS3 compliant, have MSL rating 1 (Unlimited), and are REACH unaffected. Compliance certifications are identical.

Q: Can the SN74LS266D be used in existing designs originally specified for SN74LS266DG4?

A: Yes. The SN74LS266D is a direct substitute with identical electrical and mechanical specifications. Existing designs require no modifications for component substitution.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: logic type (XNOR), number of circuits (4), number of inputs (2), open collector output configuration, supply voltage range (4.75V ~ 5.25V), output current (8mA), input logic levels (0.8V low, 2V high), propagation delay (30ns @ 5V, 15pF), operating temperature range (0°C ~ 70°C), and 14-SOIC package format.