SN74HC266DRG4 Equivalent & Substitute Parts

Part Overview

The SN74HC266DRG4 is a 4-channel XNOR (Exclusive NOR) logic gate IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This device features open drain outputs and operates across a 2V to 6V supply voltage range, making it suitable for digital logic applications requiring XNOR gate functionality.

The SN74HC266DRG4 is classified as obsolete. Equivalent substitute parts are available in active or alternative packaging configurations that maintain identical electrical and mechanical specifications, enabling direct replacement in existing designs.

Key Parameters

Parameter	Value
Logic Type	XNOR (Exclusive NOR)
Number of Circuits	4
Number of Inputs	2
Features	Open Drain
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output Low	5.2 mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay	23 ns @ 6V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74HC266DRG4 are determined by equivalence across the following critical parameters:

Logic Type: XNOR (Exclusive NOR)
Number of Circuits: 4
Number of Inputs: 2
Features: Open Drain
Voltage - Supply: 2V ~ 6V
Current - Quiescent (Max): 2 µA
Current - Output Low: 5.2 mA
Input Logic Level - Low: 0.5V ~ 1.8V
Input Logic Level - High: 1.5V ~ 4.2V
Max Propagation Delay: 23 ns @ 6V, 50pF
Operating Temperature: -40°C ~ 85°C
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts maintain identical electrical performance and mechanical compatibility. Differences exist only in product status and packaging configuration (Cut Tape & Digi-Reel versus Tape & Reel).

Parameter Comparison

Parameter	SN74HC266DRG4	SN74HC266DR	SN74HC266DT
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	XNOR (Exclusive NOR)	XNOR (Exclusive NOR)	XNOR (Exclusive NOR)
Number of Circuits	4	4	4
Number of Inputs	2	2	2
Features	Open Drain	Open Drain	Open Drain
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	2 µA	2 µA	2 µA
Current - Output Low	5.2 mA	5.2 mA	5.2 mA
Input Logic Level - Low	0.5V ~ 1.8V	0.5V ~ 1.8V	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V	1.5V ~ 4.2V	1.5V ~ 4.2V
Max Propagation Delay	23 ns @ 6V, 50pF	23 ns @ 6V, 50pF	23 ns @ 6V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics
Packaging Configuration	Digi-Reel	Cut Tape (CT) & Digi-Reel	Tape & Reel (TR)

Engineering Selection Recommendations

SN74HC266DR is the primary substitute for the SN74HC266DRG4. This part maintains active product status at Texas Instruments and is available in both Cut Tape and Digi-Reel packaging configurations. All electrical parameters, thermal specifications, and compliance certifications (ROHS3, REACH Unaffected) are identical to the original part. The SN74HC266DR is suitable for new designs and production applications requiring immediate availability.

SN74HC266DT is an alternative substitute available in Tape & Reel packaging. This part is discontinued at DiGi Electronics but remains electrically and mechanically equivalent. The SN74HC266DT is appropriate for applications where Tape & Reel packaging is preferred and inventory is available through alternative distribution channels.

Both substitute parts are direct replacements requiring no circuit modifications or design changes. Selection between SN74HC266DR and SN74HC266DT depends on packaging requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can SN74HC266DR be used as a direct replacement for SN74HC266DRG4?

A: Yes. The SN74HC266DR is electrically and mechanically equivalent to the SN74HC266DRG4. All logic parameters, voltage specifications, timing characteristics, and package dimensions are identical. The only difference is product status (Active versus Obsolete) and packaging configuration (Cut Tape & Digi-Reel versus Digi-Reel).

Q: What is the difference between SN74HC266DR and SN74HC266DT?

A: Both parts are electrically identical. The difference is packaging configuration: SN74HC266DR is available in Cut Tape and Digi-Reel formats, while SN74HC266DT is supplied in Tape & Reel format. Product status also differs: SN74HC266DR is Active, while SN74HC266DT is Discontinued at DiGi Electronics.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the 14-SOIC package with identical pin configuration and mechanical dimensions (0.154" width, 3.90mm). No PCB modifications are required when substituting between these parts.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both SN74HC266DR and SN74HC266DT are ROHS3 Compliant, REACH Unaffected, and have Moisture Sensitivity Level 1 (Unlimited), matching the original SN74HC266DRG4 specifications.

Q: What is the recommended substitute for new production designs?

A: SN74HC266DR is recommended for new production designs due to its Active product status and availability in multiple packaging configurations. This ensures long-term supply chain stability and design continuity.

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