OR gates

Simplify your signal chain with combinational logic

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Resolve common combinational logic issues such as enabling or disabling digital signals or monitoring multiple error signals with our portfolio of more than 80 OR gates. Included are open-drain and Schmitt-trigger device options available in one- to six-channel configurations.

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Featured OR gates

Why choose our OR gates?

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Wide operating voltage range

Select products ranging from 0.8V to 18V to fulfill all your application needs.

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Diverse package offering

Both leaded and nonleaded packages are available with pin counts ranging from 5 pins to 20 pins. Wettable flanks available on select packages. 

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Schmitt-trigger inputs

Our high-speed CMOS with Schmitt-trigger (HCS) family features Schmitt-trigger inputs that allow for superior noise immunity. 

Common OR gate applications and features

Use fewer MCU GPIO channels to monitor error signals

Many systems have multiple error flags to monitor. When it is more important that an error occurred than exactly which module had the error, it is possible to reduce the number of inputs required to monitor these error flags. This video discusses one method to reduce the number of required inputs to monitor a set of error-flag outputs in an example system.

Featured products for OR gates
SN74LVC2G32 ACTIVE 2-ch, 2-input 1.65-V to 5.5-V 32-mA drive strength OR gate
SN74AUP1G32 ACTIVE Single, 2-input 0.8-V to 3.6-V low-power (< 1uA) OR gate
SN74LV32A-Q1 ACTIVE Automotive, 4-ch, 2-input 2-V to 5.5-V high-speed (7 ns) OR gate

Learn more about common applications of OR gates

Digital signals sometimes need to be enabled or disabled during system operation. This video explores all the options for what to do with the output when a line is disabled, and identifies logic devices that can perform each function.

Featured products for OR gates
SN74AHCT1G32-Q1 ACTIVE Automotive, 1-channel, 2-input 4.5V to 5.5V high-speed (7.1ns) OR gate with TTL-compatible inputs
SN74AHC1G32-Q1 ACTIVE Automotive, one-channel two-input 2V to 5.5V high-speed (9 ns) OR gate
SN74AUC32 ACTIVE 4-ch, 2-input 0.8-V to 2.7-V ultra-high-speed (2.4 ns) OR gate

Optimize board size with cost-efficient solutions

The small-outline thin (SOT-23-THN) DYY package is a discrete logic leaded package measuring 4.2mm by 3.26mm, which is 57% smaller than the thin shrink small-outline package (TSSOP) equivalent. The DYY package's standard 0.5mm pitch enables easy integration into existing manufacturing equipment.

The BQA 14-pin logic very very quad flat no-lead (WQFN) package measures 3mm by 2.5mm, which is 76% smaller than the TSSOP equivalent and 40% smaller than the previous-generation QFN package. This package also comes in wettable-flank configurations to enable optical inspection rather than traditional X-ray inspection during manufacturing.

Left to right: SOT-23-THN, TSSOP, SOIC, SSOP

Featured products for OR gates
SN74AHC32 ACTIVE 4-ch, 2-input 2-V to 5.5-V high-speed (9 ns) OR gate
SN74AHCT32 ACTIVE 4-ch, 2-input 4.5-V to 5.5-V high-speed (7.1 ns) OR gate with TTL-compatible inputs
SN74HCS32-Q1 ACTIVE Automotive, 4-ch, 2-input 2-V to 6-V high-speed (12 ns) OR gate with Schmitt-trigger inputs

Reduce noise impact

Our high-speed CMOS with Schmitt-trigger (HCS) family performs over a 2V-to-6V input voltage range. Schmitt-trigger inputs decipher clean signals in 3.3V and 5V applications with high noise, and increase slow signal performance by sharpening logic-level transitions.

Application note
Reduce Noise and Save Power with the New HCS Logic Family (Rev. A)
Designers are continuously striving to improve signal integrity, reduce power and increase robustness in their systems. The HCS family was designed to achieve these goals.
PDF
Application brief
Understanding Schmitt Triggers (Rev. B)
Most CMOS, BiCMOS and TTL devices require fast edges on the high and low transitions of their inputs. If the edges are too slow, they can cause excessive
current, oscillation, or may damage the device.
PDF | HTML
Featured products for OR gates
SN74HCS4075 ACTIVE 3-ch, 3-input 2-V to 6-V high-speed (12 ns) OR gate with Schmitt-trigger inputs
SN74HCS32 ACTIVE 4-ch, 2-input 2-V to 6-V high-speed (12 ns) OR gate with Schmitt-trigger inputs
SN74HCS32-Q1 ACTIVE Automotive, 4-ch, 2-input 2-V to 6-V high-speed (12 ns) OR gate with Schmitt-trigger inputs

Technical resources

Application brief
Application brief
Understanding Schmitt Triggers (Rev. B)
Most CMOS, BiCMOS and TTL devices require fairly fast edges on the high and low transitions on their inputs. If the edges are too slow they can cause excessive current, oscillation and even damage the device.
document-pdfAcrobat PDF
Application brief
Application brief
Optimizing Board Space for Discrete LOGIC Designs Using Smallest Package Solutio (Rev. A)
The term dual footprint here refers to overlaying two PCB landing pads for two different package configurations. In supply constrained environments, this is a great method to mitigate supply issues for new designs or board spins.
document-pdfAcrobat PDF
Application brief
Application brief
User Fewer Inputs to Monitor Error Signals
Error source signals can be combined to reduce the number of required inputs to a system controller when it is more important to know that an error has occurred than it is to know which device triggered the error.
document-pdfAcrobat PDF