SparkFun Electronics
SparkFun Electronics Bi-Directional Logic Level Converter 1.8V 2.8V 3.3V
Bi-directional converter steps 5 V signals down to 3.3 V and up from 3.3 V to 5 V on the same channel, also supporting 1.8 V and 2.8 V logic levels
- TypeCurrent
- Steps 5V down to 3.3V and 3.3V up to 5V simultaneously
- Works with 1.8V and 2.8V logic devices
- Bi-directional translation on four channels per board
- Set independent high and low supply voltages per channel
- Single board handles both step-up and step-down conversion
Bi-directional logic level converter
The SparkFun bi-directional logic level converter is a small board that translates signals between different voltage domains. It handles four channels, each with two inputs and two outputs, allowing safe communication between 5 V, 3.3 V, 2.8 V and 1.8 V devices. The module requires both the high and low supply voltages to be present for operation.
Voltage translation limits
The converter steps down 5 V signals to 3.3 V and steps up 3.3 V to 5 V simultaneously on the same channel. It also supports 2.8 V and 1.8 V logic levels, but the high and low rails must be supplied externally and match the connected devices. No internal regulation or voltage generation is provided.
Four-channel bidirectional shifting
Each unit provides four independent channels that shift logic levels in both directions without direction control pins. This fixed channel count determines whether the board matches a project's I/O requirements. Buyers needing more than four translated lines must use additional modules.
Highlights
- Steps 5V down to 3.3V and 3.3V up to 5V simultaneously
- Works with 1.8V and 2.8V logic devices
- Bi-directional translation on four channels per board
- Set independent high and low supply voltages per channel
- Single board handles both step-up and step-down conversion
Specifications
| Type | Current |
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Questions about this item
Should I pick this converter for a 1.8 V sensor or a 3.3 V microcontroller?
The board handles both 1.8 V and 3.3 V low-voltage sides, so it works with either device as long as the matching high-voltage supply is provided.
What does the 5 V to 3.3 V rating mean when I wire it into my circuit?
It means each of the four channels can translate a 5 V logic signal down to 3.3 V and a 3.3 V signal up to 5 V simultaneously without extra direction control.
Which interface standard does the converter use and what speed does it limit?
The converter uses a simple MOSFET-based transistor circuit per channel; it has no protocol clock, so the practical limit is set by the RC time constant of your wiring and load.
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