Source: https://mokxi.com/parts/74hc32 Updated: 2026-11-10 Part # 74HC32 quad OR Four OR gates. See every part - 14 pins - 1 setting - In 1 project - In 3 lessons Drawn live by the editor's own code, at the size you see it. At a glance ## The 74HC32 quad OR in brief What it is, and every setting the properties panel gives it. The 74HC32, the 7432 in older kits, is four two-input OR gates in a 14-pin DIP laid out pin for pin like the 74HC08 and 74HC00, so swapping one chip for another on a breadboard changes the logic and nothing else: inputs A and B and output Y for each gate, ground on pin 7, supply on pin 14. Each output is high when either input is high; a high on one input forces the output high even with the other floating, and only two lows give a low. Inputs can come straight from Uno pins or other 74HC outputs. Leaving a real CMOS input floating is the classic mistake, since it drifts and the output chatters; Mokxi shows that input as unknown rather than guessing a level. For an ESP32, set the model property to 74HCT32, whose inputs switch at 1.4 volts so a 3.3 volt pin is a clean high; 74LS32 behaves as old TTL, with an output high near 3.4 volts. The delay is 9 nanoseconds, inertial. In the full adder template it ORs the two AND terms into the carry out. Family Logic Pins 14 model 74HC32 (or 74HCT32, 74LS32) Pins ## 14 pins Named as the editor names them, so a wire lands where you expect it. ### Input8 - 1A - 1B - 2A - 2B - 3A - 3B - 4A - 4B ### Output4 - 1Y - 2Y - 3Y - 4Y ### Input or output2 - GND - VCC How to use it ## How to use a 74HC32 OR gate in a full adder The 74HC32 has four two-input OR gates: an output is high when either input is high, and low only when both are low. A full adder carries when A and B are both 1, or when Cin is 1 and exactly one of A and B is. Those are two AND terms, and one OR gate joins them into the carry out. The circuit here uses one of the four gates. Its inputs come from the two AND outputs of the 74HC08, its output drives the carry LED through 220 ohms, and pins 14 and 7 go to 5 V and GND. Try A and B both 1, then only B with Cin: the carry lights either way, through a different input of the OR each time. Part pin Board pin VCC (pin 14) 5 V GND (pin 7) GND 1A (pin 1) The 74HC08’s 1Y, the A and B term 1B (pin 2) The 74HC08’s 2Y, the Cin term 1Y (pin 3) The carry LED through 220 ohms The 74HC32 and the 74HC08 share a pinout, so a misread part number on a real breadboard gives the wrong logic with no other symptom. The model setting also offers the 74HCT32, for 3.3 V inputs, and the 74LS32. Hold the button This is the simulator itself, running here. Click anything to open it in the editor. Open this project in the editor Read the full tutorial How it is modeled ## What is true about the 74HC32 quad OR, here In its help article’s own words: what the simulation gets right, and where it stops. ### 74HC32: quad 2-input OR gate The 7432, same package and pinout again, four OR gates. A 1 on either input forces Y high. Propagation delay: 9 ns typical. See it in: Full adder. ### Not modeled One typical delay, and nothing around it. Each chip carries a single propagation delay taken from its datasheet's typical column at VCC = 5 V, CL = 15 pF and 25 °C, and uses it for every path through the package. There is no minimum or maximum, no spread between the gates in one chip, no rise or fall time, no output slew and no dependence on supply voltage, load capacitance or temperature, all of which a real 74HC part has, and all of which a datasheet gives ranges for. On the 74HC595 the one figure is the STCP-to-Qn number used for SHCP and MR to Q7S as well, which the datasheet lists a nanosecond or two apart. No setup, hold or pulse-width checks. The 74HC74 and the 74HC595 take a clock edge whenever they see one; nothing here refuses data that changed too close to the edge or a clock pulse that was too narrow, and nothing warns about it. A real part would metastable or simply miss. No supply current, no output current limit and no bus contention damage. An output driving into another output is resolved as two drivers on one net; nothing gets hot. Sequential parts power up cleared rather than random, because a toggle divider fed Unknown never escapes it. See how faithfully a part behaves. From The 74HC logic family, in full. Projects ## See the 74HC32 quad OR in a project One built-in project uses it. It opens in the editor, already wired. Lessons ## Where it turns up in a lesson 3 lessons place it in their own circuits. ### The twelve week course 1 lesson - Week 6: Arithmetic from gates: the full adder ### Learn articles 2 lessons - Digital Electronics on Chromebooks: Labs by Unit - Virtual Electronics Lab for College Classes More parts ## The rest of the bench Every one of these is drawn and simulated the same way. Full-size breadboard A real 0.1 inch grid with the rails and the center channel, 63 columns wide. Jumper wires Drag from any pin or hole to any other. Corners snap, and you can drag them. Power A supply rail at the voltage you choose. Ground The other end of every circuit. LED Lights when current flows. Five colors, and the brightness is what your eye would see. Filament lamp A tungsten bulb in a holder: an inrush when it is switched on cold, tens of milliseconds to warm up, and dim on half its voltage. Resistor Any value you like, with the color bands drawn to match. ESP32-C3-DevKitM-1 A RISC-V board that runs your firmware at 160 MHz on the real memory map. Pushbutton A 12 mm tactile switch. Hold it while the simulation runs. Raspberry Pi Pico The RP2040 board on our own Cortex-M0+ core. Pick a program and press Run. Raspberry Pi Pico W Raspberry Pi Pico W (RP2040). The same board and the same pinout as a Pico, with the CYW43439 on it. The WiFi is simulated (no radio; real internet through the Cloud panel’s switch), and the on-board LED, which hangs off that chip rather than off GP25, is driven through the same path. Everything else is the Pico. Raspberry Pi 4 Model B Raspberry Pi 4 Model B: the 40-pin header, driven by main.py with RPi.GPIO or gpiozero. See every part ## Wire up the 74HC32 quad OR Open the editor and push it into the breadboard. It is free, and it runs on your own machine. Start building free Open the editor