{"id":369,"date":"2025-11-20T19:52:04","date_gmt":"2025-11-20T19:52:04","guid":{"rendered":"https:\/\/hamtechtechnologies.com\/index.php\/product\/pcf8574-expander\/"},"modified":"2025-11-26T20:07:39","modified_gmt":"2025-11-26T20:07:39","slug":"pcf8574-expander","status":"publish","type":"product","link":"https:\/\/hamtechtechnologies.com\/index.php\/product\/pcf8574-expander\/","title":{"rendered":"PCF8574 Expander"},"content":{"rendered":"<p data-start=\"350\" data-end=\"828\">The <strong data-start=\"383\" data-end=\"407\">PCF8574 I2C Expander<\/strong> is a versatile module that communicates via the I2C protocol, providing 8 additional digital input\/output pins using only two microcontroller pins (SDA and SCL). It is perfect for projects that need extra GPIO pins without complex wiring. The module supports up to 8 devices on the same I2C bus with configurable addresses. Ideal for driving LEDs, reading buttons, controlling relays, and other digital I\/O operations.<\/p>\n<p data-start=\"830\" data-end=\"848\"><strong data-start=\"830\" data-end=\"846\">Key Features<\/strong><\/p>\n<ul data-start=\"849\" data-end=\"1125\">\n<li data-start=\"849\" data-end=\"894\">\n<p data-start=\"851\" data-end=\"894\">Adds 8 digital I\/O pins via I2C interface<\/p>\n<\/li>\n<li data-start=\"895\" data-end=\"942\">\n<p data-start=\"897\" data-end=\"942\">Only uses 2 microcontroller pins (SDA, SCL)<\/p>\n<\/li>\n<li data-start=\"943\" data-end=\"997\">\n<p data-start=\"945\" data-end=\"997\">Address selectable via 3 address pins (A0, A1, A2)<\/p>\n<\/li>\n<li data-start=\"998\" data-end=\"1059\">\n<p data-start=\"1000\" data-end=\"1059\">Compatible with Arduino, ESP32, ESP8266, and Raspberry Pi<\/p>\n<\/li>\n<li data-start=\"1060\" data-end=\"1125\">\n<p data-start=\"1062\" data-end=\"1125\">Low power consumption, suitable for battery-operated projects<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1127\" data-end=\"1141\"><strong data-start=\"1127\" data-end=\"1139\">Variants<\/strong><\/p>\n<ul data-start=\"1142\" data-end=\"1229\">\n<li data-start=\"1142\" data-end=\"1182\">\n<p data-start=\"1144\" data-end=\"1182\">PCF8574 Standard I2C Expander Module<\/p>\n<\/li>\n<li data-start=\"1183\" data-end=\"1229\">\n<p data-start=\"1185\" data-end=\"1229\">PCF8574A Variant (alternate address range)<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1231\" data-end=\"1251\"><strong data-start=\"1231\" data-end=\"1249\">Specifications<\/strong><\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1253\" data-end=\"1508\">\n<thead data-start=\"1253\" data-end=\"1276\">\n<tr data-start=\"1253\" data-end=\"1276\">\n<th data-start=\"1253\" data-end=\"1263\" data-col-size=\"sm\">Feature<\/th>\n<th data-start=\"1263\" data-end=\"1276\" data-col-size=\"sm\">Details<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1301\" data-end=\"1508\">\n<tr data-start=\"1301\" data-end=\"1327\">\n<td data-start=\"1301\" data-end=\"1312\" data-col-size=\"sm\">I\/O Pins<\/td>\n<td data-start=\"1312\" data-end=\"1327\" data-col-size=\"sm\">8 (P0\u2013P7)<\/td>\n<\/tr>\n<tr data-start=\"1328\" data-end=\"1360\">\n<td data-start=\"1328\" data-end=\"1340\" data-col-size=\"sm\">Interface<\/td>\n<td data-start=\"1340\" data-end=\"1360\" data-col-size=\"sm\">I2C (SDA, SCL)<\/td>\n<\/tr>\n<tr data-start=\"1361\" data-end=\"1396\">\n<td data-start=\"1361\" data-end=\"1376\" data-col-size=\"sm\">Address Pins<\/td>\n<td data-start=\"1376\" data-end=\"1396\" data-col-size=\"sm\">3 (A0, A1, A2)<\/td>\n<\/tr>\n<tr data-start=\"1397\" data-end=\"1432\">\n<td data-start=\"1397\" data-end=\"1417\" data-col-size=\"sm\">Operating Voltage<\/td>\n<td data-start=\"1417\" data-end=\"1432\" data-col-size=\"sm\">3.3V \u2013 5V<\/td>\n<\/tr>\n<tr data-start=\"1433\" data-end=\"1466\">\n<td data-start=\"1433\" data-end=\"1455\" data-col-size=\"sm\">Max Current per Pin<\/td>\n<td data-start=\"1455\" data-end=\"1466\" data-col-size=\"sm\">25 mA<\/td>\n<\/tr>\n<tr data-start=\"1467\" data-end=\"1508\">\n<td data-start=\"1467\" data-end=\"1489\" data-col-size=\"sm\">Communication Speed<\/td>\n<td data-start=\"1489\" data-end=\"1508\" data-col-size=\"sm\">Up to 400 kHz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"1510\" data-end=\"1528\"><strong data-start=\"1510\" data-end=\"1526\">Applications<\/strong><\/p>\n<ul data-start=\"1529\" data-end=\"1738\">\n<li data-start=\"1529\" data-end=\"1577\">\n<p data-start=\"1531\" data-end=\"1577\">Expand GPIO for Arduino, ESP32, Raspberry Pi<\/p>\n<\/li>\n<li data-start=\"1578\" data-end=\"1611\">\n<p data-start=\"1580\" data-end=\"1611\">Drive multiple LEDs or relays<\/p>\n<\/li>\n<li data-start=\"1612\" data-end=\"1649\">\n<p data-start=\"1614\" data-end=\"1649\">Read multiple buttons or switches<\/p>\n<\/li>\n<li data-start=\"1650\" data-end=\"1693\">\n<p data-start=\"1652\" data-end=\"1693\">Control digital devices in IoT projects<\/p>\n<\/li>\n<li data-start=\"1694\" data-end=\"1738\">\n<p data-start=\"1696\" data-end=\"1738\">Microcontroller-based automation systems<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1740\" data-end=\"1774\"><strong data-start=\"1740\" data-end=\"1772\">Compatible Boards \/ Circuits<\/strong><\/p>\n<ul data-start=\"1775\" data-end=\"1890\">\n<li data-start=\"1775\" data-end=\"1802\">\n<p data-start=\"1777\" data-end=\"1802\">Arduino Uno, Mega, Nano<\/p>\n<\/li>\n<li data-start=\"1803\" data-end=\"1822\">\n<p data-start=\"1805\" data-end=\"1822\">ESP32 \/ ESP8266<\/p>\n<\/li>\n<li data-start=\"1823\" data-end=\"1849\">\n<p data-start=\"1825\" data-end=\"1849\">Raspberry Pi (via I2C)<\/p>\n<\/li>\n<li data-start=\"1850\" data-end=\"1890\">\n<p data-start=\"1852\" data-end=\"1890\">Any microcontroller with I2C support<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The <strong data-start=\"161\" data-end=\"185\">PCF8574 I2C Expander<\/strong> is an 8-bit I\/O expander for I2C bus systems, allowing you to increase the number of digital I\/O pins for microcontrollers like Arduino, ESP32, or Raspberry Pi.<\/p>\n","protected":false},"featured_media":442,"comment_status":"open","ping_status":"closed","template":"","meta":{"postBodyCss":"","postBodyMargin":[],"postBodyPadding":[],"postBodyBackground":{"backgroundType":"classic","gradient":""}},"product_brand":[],"product_cat":[145,134,410,128],"product_tag":[321,320],"class_list":{"0":"post-369","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-analog-electronics","7":"product_cat-driver-ics","8":"product_cat-i2c-modules","9":"product_cat-ic-chip","10":"product_tag-expander","11":"product_tag-pcf8574","13":"first","14":"outofstock","15":"taxable","16":"shipping-taxable","17":"purchasable","18":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/product\/369","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/comments?post=369"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/media\/442"}],"wp:attachment":[{"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/media?parent=369"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/product_brand?post=369"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/product_cat?post=369"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hamtechtechnologies.com\/index.php\/wp-json\/wp\/v2\/product_tag?post=369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}