{"id":1002,"date":"2026-02-19T02:00:00","date_gmt":"2026-02-19T02:00:00","guid":{"rendered":"https:\/\/pirhome.com\/?p=1002"},"modified":"2026-02-19T21:35:32","modified_gmt":"2026-02-19T13:35:32","slug":"am312-vs-hc-sr505-comparison","status":"publish","type":"post","link":"https:\/\/www.pirhome.com\/?p=1002","title":{"rendered":"AM312 vs HC-SR505: Mini PIR Sensor Comparison Guide"},"content":{"rendered":"

Overview<\/h2>\n

Both the AM312 and HC-SR505 are miniaturized versions of the classic HC-SR501, designed for applications where board space is limited. They maintain similar functionality while significantly reducing physical footprint.<\/p>\n

Technical Specifications Comparison<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nAM312<\/th>\nHC-SR505<\/th>\n<\/tr>\n<\/thead>\n
Dimensions<\/td>\n10mm \u00d7 8mm<\/td>\n12mm \u00d7 12mm<\/td>\n<\/tr>\n
Operating Voltage<\/td>\n2.7V – 12V<\/td>\n4.5V – 20V<\/td>\n<\/tr>\n
Operating Current<\/td>\n35\u00b5A (standby)<\/td>\n50\u00b5A (standby)<\/td>\n<\/tr>\n
Output Voltage<\/td>\n3.0V (HIGH)<\/td>\n3.3V (HIGH)<\/td>\n<\/tr>\n
Detection Range<\/td>\n3-5 meters<\/td>\n3-7 meters<\/td>\n<\/tr>\n
Detection Angle<\/td>\n100\u00b0<\/td>\n120\u00b0<\/td>\n<\/tr>\n
Delay Time<\/td>\n2 seconds (fixed)<\/td>\n3-5 seconds (fixed)<\/td>\n<\/tr>\n
Operating Temp<\/td>\n-20\u00b0C to +60\u00b0C<\/td>\n-20\u00b0C to +80\u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Detailed Analysis<\/h2>\n

Size and Form Factor<\/h3>\n

The AM312 is notably smaller at just 10\u00d78mm, making it ideal for ultra-compact wearables and discreet installations. The HC-SR505, while still considered “mini,” offers a slightly larger footprint that can be advantageous for hand-soldering and prototyping.<\/p>\n

Power Consumption<\/h3>\n

For battery-powered applications, the AM312 has a clear advantage with its 35\u00b5A standby current, nearly 30% lower than the HC-SR505. This difference can translate to weeks of additional battery life in continuous-operation scenarios.<\/p>\n

Voltage Range<\/h3>\n

The AM312’s wider voltage range (down to 2.7V) makes it compatible with 3.3V systems like ESP8266 and Raspberry Pi without level shifting. The HC-SR505 requires at least 4.5V, making it more suitable for traditional 5V Arduino projects.<\/p>\n

Detection Performance<\/h3>\n

The HC-SR505 offers slightly better detection range (up to 7 meters vs 5 meters) and wider detection angle (120\u00b0 vs 100\u00b0). This makes it preferable for room-scale monitoring applications where coverage area is critical.<\/p>\n

Pinout Comparison<\/h2>\n

AM312 Pinout<\/strong> (3 pins):<\/p>\n

    \n
  • Pin 1: VCC (2.7-12V)<\/li>\n
  • Pin 2: GND<\/li>\n
  • Pin 3: OUT (digital output)<\/li>\n<\/ul>\n

    HC-SR505 Pinout<\/strong> (3 pins):<\/p>\n

      \n
    • Pin 1: VCC (4.5-20V)<\/li>\n
    • Pin 2: OUT<\/li>\n
    • Pin 3: GND<\/li>\n<\/ul>\n

      Note the different pin ordering! Always verify pinout before wiring.<\/em><\/p>\n

      Application Scenarios<\/h2>\n

      Choose AM312 When:<\/h3>\n
        \n
      • Building battery-powered IoT sensors<\/li>\n
      • Working with 3.3V logic microcontrollers<\/li>\n
      • Space is extremely limited (<10mm board space)<\/li>\n
      • Power efficiency is the primary concern<\/li>\n
      • Fixed 2-second delay works for your use case<\/li>\n<\/ul>\n

        Choose HC-SR505 When:<\/h3>\n
          \n
        • Detection range is critical<\/li>\n
        • Working with 5V Arduino systems<\/li>\n
        • Need wider coverage angle<\/li>\n
        • Slightly longer delay (3-5s) is acceptable<\/li>\n
        • Mounting in locations where larger size isn’t an issue<\/li>\n<\/ul>\n

          Wiring Examples<\/h2>\n

          AM312 with ESP8266 (3.3V)<\/h4>\n
          \/\/ AM312 connected to ESP8266\nint pirPin = D1;  \/\/ GPIO5\n\nvoid setup() {\n  pinMode(pirPin, INPUT);\n  Serial.begin(115200);\n}\n\nvoid loop() {\n  if (digitalRead(pirPin) == HIGH) {\n    Serial.println(\"Motion detected!\");\n    \/\/ Add your IoT code here\n  }\n  delay(100);\n}\n<\/code><\/pre>\n
          HC-SR505 with Arduino (5V)<\/h4>\n
          \/\/ HC-SR505 connected to Arduino Uno\nint pirPin = 2;\n\nvoid setup() {\n  pinMode(pirPin, INPUT);\n  Serial.begin(9600);\n}\n\nvoid loop() {\n  if (digitalRead(pirPin) == HIGH) {\n    Serial.println(\"Motion detected!\");\n  }\n  delay(200);\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
          Overview Both the AM312 and HC-SR505 are miniaturized versions of the classic HC-SR501, designed for applications where board space is limited. They maintain similar functionality while significantly reducing physical footprint. Technical Specifications Comparison Parameter AM312 HC-SR505 Dimensions 10mm \u00d7 8mm 12mm \u00d7 12mm Operating Voltage 2.7V – 12V 4.5V – 20V Operating Current 35\u00b5A (standby) […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1002","post","type-post","status-publish","format-standard","hentry","category-reference"],"blocksy_meta":[],"yoast_head":"\r\nAM312 vs HC-SR505: Mini PIR Sensor Comparison Guide - PIRHOME<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.pirhome.com\/?p=1002\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"AM312 vs HC-SR505: Mini PIR Sensor Comparison Guide - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"Overview Both the AM312 and HC-SR505 are miniaturized versions of the classic HC-SR501, designed for applications where board space is limited. 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