Adafruit
74AHCT125 - Quad Level-Shifter (3V to 5V) [74AHCT125]
A quad level-shifting buffer IC that excels at converting 3V logic signals up to 5V. Power the 74AHCT125 with 5V and it will cleanly detect 3.3V logic inputs...
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A quad level-shifting buffer IC that excels at converting 3V logic signals up to 5V. Power the 74AHCT125 with 5V and it will cleanly detect 3.3V logic inputs — particularly useful when connecting devices like Teensy 3.x to NeoPixels or other 5V peripherals.
To use, apply 5V to VCC, connect GND, and tie the /OE (output enable) pins low. Data enters on the A pins and exits on the corresponding Y pins. You can also power it at 3V to safely read 5V logic inputs for stepping down voltage levels.
Key Features
- Quad Buffer/Level Shifter – Four independent channels
- 3V to 5V Shifting – Optimised for upshifting 3.3V logic to 5V
- 5V to 3V Capable – Power at 3V to safely read 5V inputs
- Output Enable – Individual /OE pins for each channel
- DIP Package – Breadboard and perfboard friendly
Ideal For
- Connecting 3.3V microcontrollers to 5V NeoPixels/WS2812B
- Raspberry Pi to 5V peripheral interfacing
- Mixed-voltage digital circuits
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- VCC
- VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.
- WS2812B
- A smart RGB LED chip with a tiny built-in controller, commonly used in addressable light strips and panels. It matters because many WS2812B LEDs can be chained together and controlled from one microcontroller pin, but they need compatible code and careful power planning as the number of LEDs grows.
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