{"id":6424,"date":"2026-06-16T03:14:36","date_gmt":"2026-06-16T03:14:36","guid":{"rendered":"https:\/\/materialparts.com\/tlp521-1\/"},"modified":"2026-06-16T03:14:36","modified_gmt":"2026-06-16T03:14:36","slug":"tlp521-1","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/tlp521-1\/","title":{"rendered":"TLP521-1"},"content":{"rendered":"

Productos<\/h2>\n

The TLP521-1 from Toshiba is a single-channel optocoupler consisting of a gallium arsenide infrared LED optically coupled to a silicon phototransistor in a 4-pin DIP package. It provides galvanic isolation of 5000Vrms, making it ideal for signal isolation between high-voltage and low-voltage circuits.<\/p>\n

Especificaciones<\/h2>\n\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>\n5000Vrms (min)<\/td>\n<\/tr>\n
CTR (Current Transfer Ratio)<\/td>\n50-300% (at IF=5mA)<\/td>\n<\/tr>\n
LED Forward Voltage<\/td>\n1.15V (typ at IF=20mA)<\/td>\n<\/tr>\n
LED Forward Current<\/td>\n50mA (max)<\/td>\n<\/tr>\n
Collector-Emitter Voltage<\/td>\n55V (max)<\/td>\n<\/tr>\n
Collector Current<\/td>\n50mA (max)<\/td>\n<\/tr>\n
Bandwidth<\/td>\n-3dB at approx 50kHz<\/td>\n<\/tr>\n
Rise Time<\/td>\n3us (typ)<\/td>\n<\/tr>\n
Fall Time<\/td>\n3us (typ)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-55C to +100C<\/td>\n<\/tr>\n
Paquete<\/td>\nDIP-4 (300mil)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 5000Vrms isolation voltage<\/li>\n
  • CTR: 50-300% (graded by suffix)<\/li>\n
  • 4-pin DIP through-hole package<\/li>\n
  • Compact creepage and clearance<\/li>\n
  • UL 1577 recognized<\/li>\n
  • VDE 0884 approved (some grades)<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Signal isolation in power supplies<\/li>\n
    • Feedback loop in SMPS<\/li>\n
    • Industrial control signal coupling<\/li>\n
    • Microcontroller I\/O isolation<\/li>\n
    • Medical equipment isolation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TLP521-1 from Toshiba is a single-channel optocoupler consisting of a gallium arsenide infrared LED optically coupled to a silicon phototransistor in a 4-pin DIP package. It provides galvanic isolation of 5000Vrms, making it ideal for signal isolation between high-voltage and low-voltage circuits. Key Specifications Channels 1 Isolation Voltage 5000Vrms (min) CTR (Current […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,13],"tags":[],"chip_brand":[169],"class_list":["post-6424","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-toshiba"],"acf":{"brief_explanation":"1-ch optocoupler, GaAs LED + phototransistor, 5000Vrms, CTR 50-300%, DIP-4","date_code":"","package_case":"DIP-4 (300mil, 7.62 x 5.08 x 4.00 mm)","in_stock":45000,"datasheet":"https:\/\/toshiba.semicon-storage.com\/info\/docget.jsp?did=10565","price":"$0.15 @ 1ku","product_introduction":"The TLP521-1 from Toshiba is a single-channel optocoupler in a 4-pin DIP package providing 5000Vrms galvanic isolation between input and output. It consists of a gallium arsenide (GaAs) infrared LED optically coupled to a silicon NPN phototransistor. The current transfer ratio (CTR) ranges from 50% to 300% depending on the grade suffix (Y1\/Y2\/Y3\/Y4), allowing designers to select the gain appropriate for their application. The TLP521-1 is one of the most widely used optocouplers for signal isolation in switched-mode power supplies (SMPS) feedback loops, industrial control systems, and medical equipment where safety isolation is mandatory. UL 1577 and VDE 0884 safety approvals are available on qualified grades.","working_principle":"The TLP521-1 converts electrical signals to light and back to electrical signals for galvanic isolation. On the input side, forward current through the GaAs infrared LED (IF) emits photons at approximately 940nm wavelength. These photons cross the optically transparent insulating barrier (typically silicone or polyimide) and strike the base region of the NPN phototransistor on the output side. The absorbed photons generate base current (photocurrent) which is amplified by the transistor's hFE to produce collector current (IC). The ratio IC\/IF is the Current Transfer Ratio (CTR), typically 50-300% depending on LED current, temperature, and device grade. The 5000Vrms isolation is achieved by the dielectric barrier between LED and phototransistor dies, which provides both electrical isolation and optical coupling simultaneously.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Anode<\/td>Input<\/td>LED anode; connect through current-limiting resistor<\/td><\/tr>
      2<\/td>Cathode<\/td>Input<\/td>LED cathode; connects to ground or drive low<\/td><\/tr>
      3<\/td>Emitter<\/td>Output<\/td>Phototransistor emitter; connects to output ground<\/td><\/tr>
      4<\/td>Collector<\/td>Output<\/td>Phototransistor collector; pull up through resistor<\/td><\/tr><\/table>","application_scenarios":"
      • SMPS Feedback Loop:<\/b> Provides isolated voltage feedback from secondary output to primary PWM controller with CTR setting loop gain; LED driven by TL431 error amplifier through the optocoupler<\/li>
      • MCU I\/O Isolation:<\/b> Isolates MCU digital I\/O from high-voltage industrial signals (e.g., 24V PLC) with 5000Vrms protecting the MCU from ground loops and transients<\/li>
      • Medical Equipment Signal Path:<\/b> Maintains patient isolation with 5000Vrms creepage\/clearance meeting IEC 60601 medical safety requirements between patient-connected circuits and control electronics<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Channels<\/th>CTR<\/th>Key Difference<\/th><\/tr>
        PC817C<\/td>Sharp<\/td>1<\/td>200-400%<\/td>Higher CTR grade, DIP-4<\/td><\/tr>
        TLP521-2<\/td>Toshiba<\/td>2<\/td>50-300%<\/td>Dual channel, DIP-8<\/td><\/tr>
        TLP521-4<\/td>Toshiba<\/td>4<\/td>50-300%<\/td>Quad channel, DIP-16<\/td><\/tr>
        6N137<\/td>Vishay<\/td>1<\/td>Logic out<\/td>High-speed (10Mbps) logic output<\/td><\/tr>
        HCPL-817<\/td>Broadcom<\/td>1<\/td>50-300%<\/td>Pin-compatible equivalent<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6424","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=6424"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6424\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=6424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=6424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=6424"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=6424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}