{"product_id":"4-channel-logic-level-converter-bss138","title":"4-Channel Logic Level Converter BSS138 - Bidirectional 3.3V to 5V","description":"\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\u003cp class=\"nznpd__intro\"\u003eA 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eChannels\u003c\/span\u003e\u003cstrong\u003e4, each bidirectional\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTransistors\u003c\/span\u003e\u003cstrong\u003eBSS138-type N-channel MOSFET (marked J1), one per channel\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003ePull-ups\u003c\/span\u003e\u003cstrong\u003e10 kΩ on every signal pin, both sides\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eLow side (LV)\u003c\/span\u003e\u003cstrong\u003e1.8 to 3.6V, must be lower than HV\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eHigh side (HV)\u003c\/span\u003e\u003cstrong\u003e3.3 to 5.5V\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eGood speeds\u003c\/span\u003e\u003cstrong\u003eI2C 100 kHz (400 kHz on short wires), UART to 115200 baud, SPI to about 1 MHz\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eNot suited to\u003c\/span\u003e\u003cstrong\u003eWS2812 LED data, fast SPI displays, or driving relays, motors and LEDs\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003ePins\u003c\/span\u003e\u003cstrong\u003eHV, LV, 2 x GND, HV1 to HV4, LV1 to LV4, 2.54 mm pitch\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBoard size\u003c\/span\u003e\u003cstrong\u003eAbout 14.4 x 12.4 mm, no mounting holes\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eDatasheets\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__ds\"\u003e\n\u003ca class=\"nznpd__dsbar\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/MOD-LLC-4CH-BSS138-Datasheet.pdf?v=1792619863\" target=\"_blank\" rel=\"noopener\" aria-label=\"Download the 4-channel logic level converter technical datasheet (PDF)\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003cspan\u003eFull technical datasheet\u003c\/span\u003e\u003cspan class=\"nznpd__dsmeta\"\u003ePDF\u003csvg width=\"17\" height=\"17\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4\"\u003e\u003c\/path\u003e\u003cpolyline points=\"7 10 12 15 17 10\"\u003e\u003c\/polyline\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"3\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003ca id=\"quick-start-guide\" class=\"nznpd__dsbar\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/MOD-LLC-4CH-BSS138-QuickStart-Rev1.pdf?v=1792619864\" target=\"_blank\" rel=\"noopener\" aria-label=\"Download the 4-channel logic level converter Quick Start (PDF)\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003cspan\u003eQuick Start: wiring and I2C test\u003c\/span\u003e\u003cspan class=\"nznpd__dsmeta\"\u003ePDF\u003csvg width=\"17\" height=\"17\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4\"\u003e\u003c\/path\u003e\u003cpolyline points=\"7 10 12 15 17 10\"\u003e\u003c\/polyline\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"3\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e\u003c\/section\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eWhat's in the box\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e1×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e4-channel logic level converter board\u003c\/strong\u003e\u003cp\u003eHeader holes empty, ready to solder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e2×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e6-pin straight male headers, 2.54 mm\u003c\/strong\u003e\u003cp\u003eLoose. Jumper wires and the boards you are joining are not included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eGreat for\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__uses\"\u003e\n\u003cdiv class=\"nznpd__use\"\u003eRead a 3.3V BMP280 sensor from a 5V Uno\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eDrive a 5V I2C LCD backpack from an ESP32\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eConnect an ESP32 to a 5V serial GPS or module\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eRead a 5V HC-SR04 echo pin on a 3.3V board\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eJoin a Raspberry Pi to 5V I2C devices\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eRun slow SPI between 3.3V and 5V parts\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eWiring \u0026amp; getting started\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFit the headers\u003c\/strong\u003e\u003cp\u003eSolder the two 6-pin headers, long pins down, to plug the board into a breadboard or onto female jumper wires.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePower both sides\u003c\/strong\u003e\u003cp\u003eHV 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.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eWire the signals\u003c\/strong\u003e\u003cp\u003eUse 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 \u003ca href=\"https:\/\/www.nznelectronics.co.nz\/products\/bmp280-barometric-pressure-temperature-sensor-module\"\u003eBMP280 3.3V sensor\u003c\/a\u003e and \u003ca href=\"https:\/\/www.nznelectronics.co.nz\/products\/rainbow-dupont-jumper-wire-kit-20cm\"\u003eDupont jumper wires\u003c\/a\u003e suit this.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCheck it works\u003c\/strong\u003e\u003cp\u003eUpload the I2C scan sketch from the Quick Start and open the Serial Monitor at 9600 baud. The sensor's address prints, for example 0x76.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\u003c\/section\u003e\n\u003c\/div\u003e\n","brand":"NZN Electronics","offers":[{"title":"Default Title","offer_id":67684754849888,"sku":"MOD-LLC-4CH-BSS138","price":2.59,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/llc-4ch-bss138-01-hero.png?v=1792636641","url":"https:\/\/www.nznelectronics.co.nz\/products\/4-channel-logic-level-converter-bss138","provider":"NZN Electronics","version":"1.0","type":"link"}