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4-Channel Logic Level Converter BSS138 – Bidirectional 3.3V to 5V – Unsoldered

4-Channel Logic Level Converter BSS138 – Bidirectional 3.3V to 5V – Unsoldered to Pinterest (opens in a new window)
4-Channel Logic Level Converter BSS138 - Bidirectional 3.3V to 5V - Unsoldered

Brand NZN Electronics CLICK IT SKU CLICK-IT-451411 Category Adapters & Converters

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  • Brand NZN Electronics

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Overview

A 4-channel bidirectional logic level converter for joining 3.3V and 5V boards, such as a 5V Arduino Uno and a 3.3V sensor, or an ESP32 and a 5V module. Each channel uses a BSS138-type MOSFET with 10 kΩ pull-ups on both sides, so it shifts I2C, UART serial and slow SPI signals in either direction. You power the low side (LV) from the lower voltage and the high side (HV) from the higher one. Two 6-pin headers come loose in the bag.

Specifications

Channels4, each bidirectional
TransistorsBSS138-type N-channel MOSFET (marked J1), one per channel
Pull-ups10 kΩ on every signal pin, both sides
Low side (LV)1.8 to 3.6V, must be lower than HV
High side (HV)3.3 to 5.5V
Good speedsI2C 100 kHz (400 kHz on short wires), UART to 115200 baud, SPI to about 1 MHz
Not suited toWS2812 LED data, fast SPI displays, or driving relays, motors and LEDs
PinsHV, LV, 2 x GND, HV1 to HV4, LV1 to LV4, 2.54 mm pitch
Board sizeAbout 14.4 x 12.4 mm, no mounting holes

Datasheets

Full technical datasheetPDF
Quick Start: wiring and I2C testPDF

What’s in the box

1×
4-channel logic level converter board

Header holes empty, ready to solder.

2×
6-pin straight male headers, 2.54 mm

Loose. Jumper wires and the boards you are joining are not included.

Great for

Read a 3.3V BMP280 sensor from a 5V Uno
Drive a 5V I2C LCD backpack from an ESP32
Connect an ESP32 to a 5V serial GPS or module
Read a 5V HC-SR04 echo pin on a 3.3V board
Join a Raspberry Pi to 5V I2C devices
Run slow SPI between 3.3V and 5V parts

Wiring & getting started

  1. Fit the headers

    Solder the two 6-pin headers, long pins down, to plug the board into a breadboard or onto female jumper wires.

  2. Power both sides

    HV to the higher supply (5V), LV to the lower one (3.3V), and GND to the ground of both boards. Both HV and LV must be connected or nothing converts.

  3. Wire the signals

    Use the same channel number on each side: for an Uno and a 3.3V I2C sensor, A4 (SDA) to HV1 and LV1 to the sensor’s SDA, then A5 (SCL) to HV2 and LV2 to SCL. The BMP280 3.3V sensor and Dupont jumper wires suit this.

  4. Check it works

    Upload the I2C scan sketch from the Quick Start and open the Serial Monitor at 9600 baud. The sensor’s address prints, for example 0x76.

Specification

Specification for 4-Channel Logic Level Converter BSS138 - Bidirectional 3.3V to 5V - Unsoldered
CLICK IT SKU CLICK-IT-451411
Brand NZN Electronics

Features

A 4-channel bidirectional logic level converter for joining 3.3V and 5V boards, such as a 5V Arduino Uno and a 3.3V sensor, or an ESP32 and a 5V module. Each channel uses a BSS138-type MOSFET with 10 kΩ pull-ups on both sides, so it shifts…

  • Brand NZN Electronics

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