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Texas Instruments SN74HC266N — Signal Isolation
Texas Instruments

SN74HC266N TI 74HC XNOR Gate, Open-Drain, 14-DIP, 2V–6V

MPNSN74HC266N
End of Life

Texas Instruments 74HC series, SN74HC266N, Logic Type XNOR (Exclusive NOR), 4 Circuits, 2 Inputs, Open Drain Output, 14-DIP (0.300", 7.62mm), Through Hole, 2V ~ 6V Supply, -40°C ~ 85°C.

$0.62Ref. price · indicative, final on quote
SN74HC266N datasheet
Packaging14-DIP (0.300", 7.62mm)
StockContact for availability
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Specifications

SN74HC266N Technical Specifications
ParameterValue
Series74HC
Logic typeXNOR (Exclusive NOR)
Mounting typeThrough Hole
Voltage2V ~ 6V
Current - quiescent2 µA
Current - output high, low-, 5.2mA
Number of inputs2
Operating temperature-40°C ~ 85°C
PackageTube
FeaturesOpen Drain
Case14-DIP (0.300\", 7.62mm)
Number of circuits4
Input logic level - low0.5V ~ 1.8V
Input logic level - high1.5V ~ 4.2V
Max propagation delay @ v, max CL23ns @ 6V, 50pF

Product details

Quad XNOR with open-drain outputs — bus-level logic without contention

The Texas Instruments SN74HC266N is a quad 2-input XNOR gate with open-drain outputs, in a 14-DIP through-hole package. Supply range is 2V to 6V.

Open-drain output — what it buys you on the bus

Open-drain output sinks 5.2 mA per output. The high level is set by an external pull-up resistor.

Propagation delay and timing margin

Maximum propagation delay is 23 ns at 6V supply with a 50 pF load.

Package and mounting — 14-DIP for prototyping and retrofit

The SN74HC266N comes in a 14-lead plastic DIP (0.300" body width, 7.62 mm pitch) for through-hole soldering. That footprint is breadboard-friendly and easy to hand-solder, which is why this package persists in maintenance spares, lab prototypes, and retrofit of legacy boards where the original surface-mount gate has been replaced with a DIP adapter. The supplier device package is 14-PDIP, identical in footprint to the industry-standard 14-pin DIP.

Frequently asked questions

Does SN74HC266N have open-drain outputs?

Yes, the outputs are open-drain. The output high level is set by an external pull-up resistor, and the output can sink 5.2 mA.

What is a direct equivalent or cross reference for SN74HC266N?

No pin-compatible XNOR second source is listed. The closest functional peer is the SN74HC21N (dual 4-input AND gate in the same 14-DIP package), but the logic function differs — verify the design can accept AND logic before substituting.