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logic IC

74HC125 Quad 3-State Buffer

The 74HC125 Quad 3-State Buffer is a logic IC in the LabWired part catalog. Its catalog type is 74hc125. It connects to the MCU over GPIO. The catalog gives a supply range of 2–6 V. It has 14 pins. A registered peripheral model runs in the engine: the firmware talks to it over the real bus and gets device-accurate responses.

From the catalog: Quad 3-state buffer with a PER-GATE active-low OE (core/configs/devices/74hc125.yaml), 9 ns. The four buffers gate independently, which is what makes it a bus driver. NOT modelled: LVT vs HC input thresholds — SN74LVTH125 is this model with different levels.

Key facts

CategoryLogic ICs
Catalog type74hc125
InterfaceGPIO
Supply range2–6 V
Pins14
DatasheetNexperia 74HC125 datasheet

What LabWired simulates

What is simulated

Simulated device model

How it was validated

Built from the datasheet. Implemented from the part’s register documentation and exercised by automated tests. Nothing physical was ever placed next to it.

74HC125 Quad 3-State Buffer pinout

PinElectrical typeFunction
A1 Input —
Y1 Tri-state —
OE1 Input —
A2 Input —
Y2 Tri-state —
OE2 Input —
A3 Input —
Y3 Tri-state —
OE3 Input —
A4 Input —
Y4 Tri-state —
OE4 Input —
VCC Power input Supply
GND Power input Supply

How to simulate the 74HC125 Quad 3-State Buffer in LabWired

  1. Open the Playground at app.labwired.com and place an MCU board.
  2. Add the 74HC125 Quad 3-State Buffer (catalog type 74hc125).
  3. Connect VCC and GND to the supply and ground of the board. Use a supply inside the catalog range of 2–6 V.
  4. Connect A1, Y1, OE1, A2, Y2, OE2, A3, Y3, OE3, A4, Y4 and OE4 as your circuit needs.
  5. Run the firmware. It drives and reads the pins of the part, and the device model responds on those pins.

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Modelled from Nexperia 74HC125 datasheet.

Wire it up in Playground → See the full validation matrix