{"id":7531,"date":"2026-06-25T07:58:10","date_gmt":"2026-06-25T07:58:10","guid":{"rendered":"https:\/\/materialparts.com\/is281-4gb\/"},"modified":"2026-06-25T07:58:10","modified_gmt":"2026-06-25T07:58:10","slug":"is281-4gb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/is281-4gb\/","title":{"rendered":"IS281-4GB"},"content":{"rendered":"

Productos<\/h2>\n

The IS281-4GB from Isocom Components is a 4-channel transistor output optocoupler in 16-pin PDIP (SMD) package with tape and reel packaging. Provides galvanic isolation for digital signal coupling.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Canales<\/td>\n4<\/td>\n<\/tr>\n
Tensi\u00f3n de aislamiento<\/td>\n5000 Vrms<\/td>\n<\/tr>\n
CTR (Current Transfer Ratio)<\/td>\n50% to 300% @ IF=5mA<\/td>\n<\/tr>\n
Input Forward Current<\/td>\n60 mA max<\/td>\n<\/tr>\n
Output Collector Current<\/td>\n50 mA max per channel<\/td>\n<\/tr>\n
Output Collector-Emitter Voltage<\/td>\n80V (BVCEO)<\/td>\n<\/tr>\n
Bandwidth<\/td>\nDC to 300 kHz typical<\/td>\n<\/tr>\n
Input-Output Capacitance<\/td>\n0.6 pF typical<\/td>\n<\/tr>\n
Paquete<\/td>\n16-Pin PDIP (SMD variant)<\/td>\n<\/tr>\n
Embalaje<\/td>\nTape and Reel (GB suffix)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-55 to +100 C<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 4 isolated channels in a single 16-pin package<\/li>\n
  • 5000Vrms isolation voltage for safety-critical applications<\/li>\n
  • Wide CTR range of 50% to 300% for design flexibility<\/li>\n
  • 80V collector-emitter breakdown voltage<\/li>\n
  • SMD-compatible PDIP package with tape and reel<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Industrial control signal isolation<\/li>\n
    • Power supply feedback loop isolation<\/li>\n
    • Medical equipment patient isolation<\/li>\n
    • Communication interface ground loop elimination<\/li>\n
    • PLC digital I\/O module isolation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The IS281-4GB from Isocom Components is a 4-channel transistor output optocoupler in 16-pin PDIP (SMD) package with tape and reel packaging. Provides galvanic isolation for digital signal coupling. Key Specifications Channels 4 Isolation Voltage 5000 Vrms CTR (Current Transfer Ratio) 50% to 300% @ IF=5mA Input Forward Current 60 mA max Output Collector […]<\/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":[13,20],"tags":[],"chip_brand":[309],"class_list":["post-7531","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-isocom"],"acf":{"brief_explanation":"4-ch optocoupler, 5000Vrms, 16-Pin PDIP SMD, T&R","date_code":"","package_case":"16-Pin PDIP SMD (9.9 x 6.5 x 4.6 mm)","in_stock":2345,"datasheet":"https:\/\/www.isocom.com\/wp-content\/uploads\/2021\/07\/DE93273.pdf","price":"$2.00 @ 1ku","product_introduction":"The IS281-4GB from Isocom Components 2004 LTD is a 4-channel transistor output optocoupler in 16-pin PDIP surface-mount package with tape and reel packaging. Each channel consists of a GaAs infrared LED optically coupled to a silicon NPN phototransistor, providing 5000Vrms galvanic isolation between input and output. The 4-channel configuration in a single package simplifies multi-signal isolation in industrial control applications. The CTR (current transfer ratio) ranges from 50% to 300% at 5mA forward current, and the 80V BVCEO allows direct interface with 24V industrial logic. The GB suffix indicates the SMD-compatible PDIP package with tape and reel packaging.","working_principle":"The IS281-4GB operates as a 4-channel optocoupler. (1) Each channel contains a GaAs infrared LED on the input side and a silicon NPN phototransistor on the output side, separated by an optically transparent insulation layer that provides 5000Vrms galvanic isolation. When forward current flows through the LED, it emits infrared light that is detected by the phototransistor base region, generating base current that turns on the transistor. (2) The CTR (Current Transfer Ratio) defines the relationship between LED forward current and phototransistor collector current. At IF=5mA, the CTR ranges from 50% to 300%, meaning the collector current can be 2.5mA to 15mA. The wide CTR range accounts for LED aging and temperature variation. (3) The 0.6pF input-output capacitance provides excellent common-mode rejection, preventing high-frequency noise from coupling across the isolation barrier. The DC-to-300kHz bandwidth is suitable for digital logic signals and low-frequency analog coupling.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>A1<\/td>Channel 1 LED anode<\/td><\/tr>
      2<\/td>C1<\/td>Channel 1 phototransistor collector<\/td><\/tr>
      3<\/td>E1<\/td>Channel 1 phototransistor emitter<\/td><\/tr>
      4<\/td>A2<\/td>Channel 2 LED anode<\/td><\/tr>
      5<\/td>C2<\/td>Channel 2 phototransistor collector<\/td><\/tr>
      6<\/td>E2<\/td>Channel 2 phototransistor emitter<\/td><\/tr>
      7<\/td>A3<\/td>Channel 3 LED anode<\/td><\/tr>
      8<\/td>C3<\/td>Channel 3 phototransistor collector<\/td><\/tr>
      9<\/td>E3<\/td>Channel 3 phototransistor emitter<\/td><\/tr>
      10<\/td>A4<\/td>Channel 4 LED anode<\/td><\/tr>
      11<\/td>C4<\/td>Channel 4 phototransistor collector<\/td><\/tr>
      12<\/td>E4<\/td>Channel 4 phototransistor emitter<\/td><\/tr>
      13,16<\/td>K1-K4<\/td>LED cathodes (common or separate)<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial control signal isolation for PLC digital I\/O modules<\/li>
      • Power supply feedback loop isolation with 5000Vrms rating<\/li>
      • Medical equipment patient isolation for safety compliance<\/li>
      • Communication interface ground loop elimination in RS-232\/485<\/li>
      • Multi-channel motor drive logic isolation with 4 channels per IC<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        IS281-4<\/td>Isocom<\/td>Through-hole PDIP version<\/td><\/tr>
        TLP281-4<\/td>Toshiba<\/td>4-channel, similar, SOIC-16<\/td><\/tr>
        PC847<\/td>Sharp<\/td>4-channel, DIP-16, similar<\/td><\/tr>
        CNY74-4H<\/td>Vishay<\/td>4-channel, DIP-16, similar<\/td><\/tr>
        LTV-847<\/td>Lite-On<\/td>4-channel, DIP-16, equivalent<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7531","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=7531"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7531\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7531"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7531"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}