TLP291 – Optocoupler – Toshiba

The Toshiba TLP291 is a single-channel transistor-output photocoupler pairing an infrared LED with a silicon photo-transistor, rated for 3750 Vrms isolation in a compact 4-pin SO4 surface-mount package.

The Toshiba TLP291 is a single-channel transistor-output photocoupler (optocoupler) that optically couples an infrared emitting diode to a silicon photo-transistor. Built in a compact 4-pin SO4 surface-mount package, it delivers a high 3750 Vrms isolation rating while supporting high-density board layouts, making it a popular general-purpose isolation device for switching power supplies, programmable controllers, and signal-level interfacing. The orderable base device is the Toshiba TLP291; CTR-binned variants are specified by appending a rank code (for example TLP291(GB,E for rank GB), and a VDE-approved version is designated with Option (V4) per the EN 60747-5-5 standard.

Key Features

• Single-channel (1-element) transistor-output photocoupler
• Infrared LED optically coupled to a silicon photo-transistor
• Isolation voltage: 3750 Vrms (minimum)
• Collector-emitter voltage (V_CEO): 80 V
• Input forward current (I_F): 50 mA (max)
• Current Transfer Ratio (CTR): 50% minimum (un-ranked); rank GB is 100% minimum
• Wide operating temperature range: -55 C to +110 C
• 4-pin SO4 surface-mount package for high-density mounting
• UL 1577 recognized (File No. E67349); VDE-approved variants available via Option (V4) per EN 60747-5-5

Applications

• Switching and small power supplies
• Programmable logic and industrial controllers
• AC/DC input signal isolation and level shifting
• Home appliances and consumer electronics
• Measurement and instrumentation feedback loops

Why Source TLP291 from Pacific Component Xchange

The TLP291 can be difficult to obtain through authorized channels in the quantities and lead times engineering teams need. Pacific Component Xchange is an independent distributor specializing in hard-to-find and allocated power-management ICs and optocouplers. We help buyers secure the Toshiba TLP291 and its VDE-approved (Option V4) variants even when authorized-distributor availability is limited or obsolete. Every order is backed by our authenticity and quality-assurance process, with global shipping to keep your production line running. Request a quote (RFQ) today and our sourcing specialists will respond with availability, pricing, date codes, and lead time for your required quantity.