SN74LS266NG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The SN74LS266NG4 is a quad 2-input XNOR gate IC from Texas Instruments in a 14-pin DIP package using the 74LS low-power Schottky TTL family. It provides four independent XNOR logic functions with open-collector outputs suitable for wired-OR bus applications. Available worldwide for digital comparison and parity generation circuits operating at 5V.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- SN74LS266NG4 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS266NG4?
- Quad 2-input XNOR gate with open-collector outputs enabling wired-OR logic without additional buffers
- 74LS low-power Schottky TTL family with 5V operation and propagation delays under 20 ns
- 14-pin DIP through-hole package for breadboard prototyping and legacy digital logic board repair
- Four independent XNOR channels per package support 4-bit magnitude comparison in a single IC
What is SN74LS266NG4 used for?
The SN74LS266NG4 is used in digital logic circuits requiring XNOR (equivalence) comparison, such as 4-bit equality detectors, parity checkers, and error detection circuits in serial data links. Its open-collector outputs suit wired-OR bus configurations where multiple gate outputs share a common pull-up resistor on a 5V TTL bus. Educational digital logic labs, retro-computing projects, and industrial PLC I/O signal conditioning boards also use the DIP-14 package for simple bitwise equivalence logic.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SN74LS266NG4 datasheet?
SN74LS266NG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS266NG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many independent XNOR logic channels does the SN74LS266NG4 provide per package?
The SN74LS266NG4 contains 4 independent 2-input XNOR gates in a single 14-pin DIP package, each operating from a 5V TTL supply with propagation delays under 20 ns, allowing one IC to handle a complete 4-bit equality comparison circuit.
What advantage does the open-collector output of the SN74LS266NG4 offer in bus-connected logic designs?
Open-collector outputs allow multiple SN74LS266NG4 gate outputs to share a common wire with a single pull-up resistor, implementing wired-OR logic without additional bus driver ICs, which simplifies parity detection trees and multi-gate enable signals on 5V TTL backplane buses.
For a 4-bit binary comparator circuit, how can SN74LS266NG4 determine if two 4-bit values are equal?
Connect each pair of corresponding bits to one XNOR gate input pair. All 4 XNOR outputs are logic 1 only when every bit pair matches, feeding an AND gate or wired-AND node to produce a single equality flag, which indicates identical 4-bit values within approximately 20 ns total propagation delay.
Is SN74LS266NG4 compatible with 5V CMOS logic inputs in a mixed-logic PCB design?
Yes. The 74LS TTL output levels — logic high above 2.7V and logic low below 0.5V — are fully recognized by 5V CMOS inputs with thresholds at 3.5V high and 1.5V low when an external pull-up resistor of 1 kΩ to 4.7 kΩ is used on the open-collector outputs to reach CMOS logic high voltage.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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