{"id":3735,"date":"2026-06-08T02:53:56","date_gmt":"2026-06-08T02:53:56","guid":{"rendered":"https:\/\/materialparts.com\/tlp291gb\/"},"modified":"2026-06-08T02:53:56","modified_gmt":"2026-06-08T02:53:56","slug":"tlp291gb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/tlp291gb\/","title":{"rendered":"TLP291GB"},"content":{"rendered":"

Productos<\/h2>\n

The TLP291GB from Toshiba is a 1-channel phototransistor output optocoupler in a low-profile SO4 package. It features 3750Vrms isolation voltage, 80V collector-emitter voltage, and a CTR of 100%-400% (GB rank). NRND status.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Canales<\/td>\n1<\/td>\n<\/tr>\n
Tensi\u00f3n de aislamiento<\/td>\n3750 Vrms (min)<\/td>\n<\/tr>\n
Collector-Emitter Voltage<\/td>\n80V<\/td>\n<\/tr>\n
Collector Current<\/td>\n50mA<\/td>\n<\/tr>\n
Forward Current<\/td>\n50mA<\/td>\n<\/tr>\n
Forward Voltage<\/td>\n1.25V (typ)<\/td>\n<\/tr>\n
CTR (GB rank)<\/td>\n100% – 400%<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n300mV (max)<\/td>\n<\/tr>\n
Rise Time<\/td>\n4us (typ)<\/td>\n<\/tr>\n
Fall Time<\/td>\n7us (typ)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-55 to +110 C<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 2.3mm low-profile SO4 package<\/li>\n
  • High isolation voltage: 3750Vrms<\/li>\n
  • Wide operating temperature: -55 to 110 C<\/li>\n
  • Safety standards: UL1577, cUL, VDE EN 60747-5-5<\/li>\n
  • Ag alloy contact material (Cd-free)<\/li>\n
  • Surface mount package<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Communication interface isolation<\/li>\n
    • Switching power supplies<\/li>\n
    • Programmable logic controllers (PLC)<\/li>\n
    • Industrial control signal isolation<\/li>\n
    • Home appliances<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TLP291GB from Toshiba is a 1-channel phototransistor output optocoupler in a low-profile SO4 package. It features 3750Vrms isolation voltage, 80V collector-emitter voltage, and a CTR of 100%-400% (GB rank). NRND status. Key Specifications Channels 1 Isolation Voltage 3750 Vrms (min) Collector-Emitter Voltage 80V Collector Current 50mA Forward Current 50mA Forward Voltage 1.25V […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[169],"class_list":["post-3735","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-toshiba"],"acf":{"brief_explanation":"1-ch phototransistor optocoupler, 3750Vrms isolation, 80V\/50mA, CTR 100-400%, SO4","date_code":"","package_case":"SO4 (2.6 x 7.0 x 2.1 mm)","in_stock":9140,"datasheet":"https:\/\/toshiba.semicon-storage.com\/ap-en\/semiconductor\/product\/optoelectronics\/detail.TLP291.html","price":"$0.178 @ 1ku","product_introduction":"The TLP291GB from Toshiba is a general-purpose phototransistor output optocoupler housed in a compact 2.3mm low-profile SO4 surface-mount package. It consists of a gallium arsenide infrared emitting diode optically coupled to a phototransistor detector. The device provides high isolation voltage of 3750Vrms minimum, making it suitable for applications requiring robust electrical isolation between primary and secondary circuits. The GB rank specifies a current transfer ratio (CTR) of 100% to 400% at IF=5mA and VCE=5V, ensuring reliable signal transfer across the isolation barrier. With a collector-emitter voltage rating of 80V and a maximum collector current of 50mA, the TLP291GB can directly drive small loads or interface with logic circuits. The wide operating temperature range of -55 to +110 C makes it suitable for demanding industrial environments. The device carries multiple safety approvals including UL1577, cUL, and VDE EN 60747-5-5. Note: This device is NRND (Not Recommended for New Designs); consider TLP293 or newer alternatives for new projects.","working_principle":"The TLP291GB operates as an optically coupled signal isolator. Key subsystems include: (1) Infrared LED - the input side consists of a GaAs infrared emitting diode; when forward current (IF) flows through the LED, it emits infrared light with a typical forward voltage of 1.25V at 5mA; the maximum continuous forward current is 50mA; (2) Phototransistor Detector - the output side contains an NPN phototransistor that is optically coupled to the LED through a transparent isolation medium; incident infrared photons generate base current in the phototransistor, which is then amplified by the transistor's current gain; the resulting collector current (IC) is proportional to the LED forward current through the current transfer ratio (CTR); (3) Optical Isolation - the LED and phototransistor are physically separated by an isolation barrier providing 3750Vrms minimum dielectric strength; this ensures electrical safety and noise immunity between input and output circuits; (4) CTR (Current Transfer Ratio) - the GB rank specifies CTR of 100% to 400% at IF=5mA, VCE=5V; this means the output collector current is 1 to 4 times the input LED current under specified conditions; CTR varies with LED current, ambient temperature, and device aging.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>Anode<\/td>LED anode (input side)<\/td><\/tr>
      2<\/td>Cathode<\/td>LED cathode (input side)<\/td><\/tr>
      3<\/td>Emitter<\/td>Phototransistor emitter (output side)<\/td><\/tr>
      4<\/td>Collector<\/td>Phototransistor collector (output side)<\/td><\/tr><\/table>","application_scenarios":"
      • Switching power supply feedback: isolation between high-voltage primary and low-voltage secondary in flyback converters<\/li>
      • PLC digital I\/O: isolating 24V industrial logic from 3.3V\/5V MCU pins<\/li>
      • Communication interface: RS-485\/RS-232 ground loop elimination between systems<\/li>
      • Motor drive signal isolation: separating control logic from power stage gate drivers<\/li>
      • Home appliance control: AC zero-cross detection and triac driving with safety isolation<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Toshiba<\/td>TLP293(GB<\/td>SO4<\/td>Lower CTR, recommended replacement<\/td><\/tr>
        Vishay<\/td>SFH615A-3<\/td>DIP-4<\/td>Similar spec, through-hole<\/td><\/tr>
        Everlight<\/td>EL817C<\/td>DIP-4<\/td>Popular alternative, higher CTR<\/td><\/tr>
        Sharp<\/td>PC817C<\/td>DIP-4<\/td>Industry standard optocoupler<\/td><\/tr>
        Toshiba<\/td>TLP291(V4<\/td>SO4<\/td>VDE-certified version<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3735","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=3735"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3735\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=3735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=3735"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=3735"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=3735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}