SN74HC266D Equivalent & Substitute Parts

Part Overview

The SN74HC266D is a 4-channel XNOR (Exclusive NOR) logic gate IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component implements open drain output architecture and operates across a 2V to 6V supply voltage range. The SN74HC266D has been discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs.

Substiute Parts

SN74HC266D

Texas InstrumentsIn Stock: 1004SN74HC266D Datasheet

Current PartRFQ

SN74HC266DR

Texas InstrumentsIn Stock: 2215SN74HC266DR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC266D is determined by strict equivalence across the following critical parameters:

• Logic Type: XNOR (Exclusive NOR) with identical 4-channel, 2-input configuration
• Output Architecture: Open Drain topology
• Supply Voltage Range: 2V ~ 6V
• Electrical Characteristics: Quiescent current, output current, input logic levels, and propagation delay
• Package: 14-SOIC surface mount form factor
• Compliance: ROHS3 and REACH status

The SN74HC266DR qualifies as a direct substitute based on complete electrical and mechanical parameter alignment. The primary distinction is packaging format: the SN74HC266D is supplied in Tube packaging, while the SN74HC266DR is available in Cut Tape (CT) and Digi-Reel® (Tape & Reel) formats. Both parts share identical die specifications and performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC266DR is the appropriate substitute for the discontinued SN74HC266D. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, logic functionality, and thermal operating range. The SN74HC266DR carries Active product status, ensuring continued availability and supply chain reliability.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage or handling.

The distinction between these parts is packaging format only. The SN74HC266D was supplied in Tube packaging, while the SN74HC266DR is available in Cut Tape and Digi-Reel formats. This difference does not affect electrical performance or PCB assembly compatibility when using standard surface mount equipment.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC266DR directly replace the SN74HC266D in existing designs?

A: Yes. The SN74HC266DR is electrically and mechanically identical to the SN74HC266D. Both parts implement the same 4-channel XNOR logic gate with open drain outputs, identical supply voltage range, and matching propagation delay characteristics. PCB footprints and assembly processes remain unchanged.

Q: What is the primary reason for substitution?

A: The SN74HC266D has been discontinued at DiGi Electronics. The SN74HC266DR maintains Active product status and is the direct equivalent from the same manufacturer, ensuring design continuity and supply availability.

Q: Are there packaging considerations when switching from SN74HC266D to SN74HC266DR?

A: The SN74HC266D was supplied in Tube packaging, while the SN74HC266DR is available in Cut Tape (CT) and Digi-Reel® (Tape & Reel) formats. These are packaging and delivery formats only. The die, electrical characteristics, and 14-SOIC package footprint are identical. Standard surface mount assembly equipment handles both formats without modification.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74HC266D and SN74HC266DR are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for both parts, indicating no special storage or handling requirements.

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

A: Substitution is based on matching logic type (XNOR, 4-channel, 2-input), output architecture (open drain), supply voltage range (2V ~ 6V), quiescent current (2 µA max), output current (5.2mA max), input logic levels, propagation delay (23ns @ 6V, 50pF), and operating temperature range (-40°C ~ 85°C).