{"id":3301,"date":"2026-02-21T17:30:00","date_gmt":"2026-02-21T17:30:00","guid":{"rendered":"https:\/\/pirhome.com\/?p=3301"},"modified":"2026-02-21T17:30:00","modified_gmt":"2026-02-21T17:30:00","slug":"murata-ira-s200st01-analysis","status":"publish","type":"post","link":"https:\/\/www.pirhome.com\/?p=3301","title":{"rendered":"Murata IRA-S200ST01 Pyroelectric Sensor: Complete Technical Analysis"},"content":{"rendered":"<h2>Introduction<\/h2>\n<p>The Murata IRA-S200ST01 is a high-performance pyroelectric infrared sensor widely used in security systems, automatic doors, and occupancy detection. This article provides a complete technical analysis of its specifications, characteristics, and integration requirements.<\/p>\n<h2>Key Specifications<\/h2>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Package<\/td>\n<td>TO-5 metal can (3-pin)<\/td>\n<\/tr>\n<tr>\n<td>Detector Element<\/td>\n<td>Dual-element (series connection)<\/td>\n<\/tr>\n<tr>\n<td>Window Material<\/td>\n<td>Silicon with IR filter<\/td>\n<\/tr>\n<tr>\n<td>Spectral Response<\/td>\n<td>7-14 \u00b5m (human detection band)<\/td>\n<\/tr>\n<tr>\n<td>Responsivity<\/td>\n<td>3.3 kV\/W (typical at 1 Hz, 500K blackbody)<\/td>\n<\/tr>\n<tr>\n<td>Noise Equivalent Power (NEP)<\/td>\n<td>1.5\u00d710\u207b\u2079 W\/\u221aHz<\/td>\n<\/tr>\n<tr>\n<td>Detectivity (D*)<\/td>\n<td>1.5\u00d710\u2078 cm\u00b7\u221aHz\/W<\/td>\n<\/tr>\n<tr>\n<td>Operating Voltage<\/td>\n<td>2-15 V (via external circuit)<\/td>\n<\/tr>\n<tr>\n<td>Operating Temperature<\/td>\n<td>-40\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Storage Temperature<\/td>\n<td>-40\u00b0C to +80\u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Internal Structure<\/h2>\n<p>The IRA-S200ST01 contains two pyroelectric elements connected in series with opposite polarity. This differential configuration provides excellent common-mode rejection of ambient temperature changes and vibration-induced signals.<\/p>\n<p>The sensor includes an integrated JFET impedance converter configured as a source follower. A built-in resistor (typically 10-50 G\u03a9) provides the necessary DC bias path.<\/p>\n<h2>Electrical Characteristics<\/h2>\n<h3>Output Signal<\/h3>\n<p>The sensor outputs a voltage signal that varies with incident IR radiation. Typical signal levels:<\/p>\n<ul>\n<li>Human walking at 5m: 10-50 mV peak-to-peak<\/li>\n<li>Noise floor: 1-5 mV (depending on bandwidth)<\/li>\n<\/ul>\n<h3>Frequency Response<\/h3>\n<p>The sensor&#8217;s response rolls off below approximately 0.1 Hz due to the electrical time constant (sensor capacitance \u00d7 load resistance). The upper cutoff is determined by the thermal time constant of the elements, typically 10-100 Hz.<\/p>\n<h2>Equivalent Circuit<\/h2>\n<p>The IRA-S200ST01 can be modeled as:<\/p>\n<ul>\n<li>Pyroelectric current source (i_p) in parallel with sensor capacitance (C_s \u2248 20-50 pF)<\/li>\n<li>Parallel resistance (R_s > 10\u00b9\u00b3 \u03a9)<\/li>\n<li>Series JFET source follower with gain \u2248 0.7-0.9<\/li>\n<\/ul>\n<h2>Application Circuit<\/h2>\n<p>A typical interface circuit requires:<\/p>\n<ol>\n<li>Load resistor (R_L) from source pin to GND: 10-100 k\u03a9<\/li>\n<li>Drain resistor (R_D) from drain pin to VCC: 10-100 k\u03a9<\/li>\n<li>Coupling capacitor to remove DC bias<\/li>\n<li>Subsequent amplification stages (gain 60-80 dB)<\/li>\n<\/ol>\n<pre><code>Typical circuit:\nVCC \u2500\u2500\u2500\u2500 R_D (47k) \u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500 Drain pin\n                        \u2502\n                        \u251c\u2500\u2500\u2500\u2500 Output to AC coupling\n                        \u2502\nSource pin \u2500\u2500\u2500\u2500 R_L (47k) \u2500\u2500\u2500\u2500 GND\n<\/code><\/pre>\n<h2>Comparison with Other Murata Models<\/h2>\n<table>\n<thead>\n<tr>\n<th>Model<\/th>\n<th>Package<\/th>\n<th>Elements<\/th>\n<th>Typical Use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>IRA-S200ST01<\/td>\n<td>TO-5<\/td>\n<td>Dual (series)<\/td>\n<td>General purpose<\/td>\n<\/tr>\n<tr>\n<td>IRA-S210ST01<\/td>\n<td>TO-5<\/td>\n<td>Dual (parallel)<\/td>\n<td>Higher signal<\/td>\n<\/tr>\n<tr>\n<td>IRA-E700<\/td>\n<td>SMD<\/td>\n<td>Single<\/td>\n<td>Compact designs<\/td>\n<\/tr>\n<tr>\n<td>IRA-S230ST01<\/td>\n<td>TO-5<\/td>\n<td>Quad<\/td>\n<td>Direction detection<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>PCB Layout Guidelines<\/h2>\n<ul>\n<li>Keep traces short, especially to the JFET gate (internal to sensor).<\/li>\n<li>Guard ring around the input pins to minimize leakage currents.<\/li>\n<li>Avoid running high-speed digital traces near the sensor.<\/li>\n<li>Provide adequate decoupling on the power supply.<\/li>\n<\/ul>\n<h2>Lens Selection<\/h2>\n<p>The IRA-S200ST01 requires an external Fresnel lens. Murata offers compatible lenses with various patterns:<\/p>\n<ul>\n<li>IRA-L408B: Wide angle (100\u00b0)<\/li>\n<li>IRA-L409B: Long range (curtain)<\/li>\n<li>IRA-L410B: Pet immune<\/li>\n<\/ul>\n<h2>Conclusion<\/h2>\n<p>The Murata IRA-S200ST01 is a versatile, high-quality pyroelectric sensor suitable for a wide range of motion detection applications. Understanding its characteristics enables optimal circuit design and system integration.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction The Murata IRA-S200ST01 is a high-performance pyroelectric infrared sensor widely used in security systems, automatic doors, and occupancy detection. This article provides a complete technical analysis of its specifications, characteristics, and integration requirements. Key Specifications Parameter Value Package TO-5 metal can (3-pin) Detector Element Dual-element (series connection) Window Material Silicon with IR filter Spectral [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-3301","post","type-post","status-publish","format-standard","hentry","category-reference"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Murata IRA-S200ST01 Pyroelectric Sensor: Complete Technical Analysis - 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=\"http:\/\/www.pirhome.com\/?p=3301\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Murata IRA-S200ST01 Pyroelectric Sensor: Complete Technical Analysis - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"Introduction The Murata IRA-S200ST01 is a high-performance pyroelectric infrared sensor widely used in security systems, automatic doors, and occupancy detection. 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