TLP291-4(GB-TP,E)
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| Part Number | TLP291-4(GB-TP,E) |
|---|---|
| Manufacturer |
 Toshiba
|
| Description | The TLP291-4 is a compact 4-channel phototransistor output photocoupler from Toshiba, designed to provide galvanic isolation between low-voltage control circuitry and electrically separated signal or power circuits. Four independent optical isolation channels are integrated into a single low-profile SO16 surface-mount package, making the device particularly suitable for high-density industrial electronic designs. Each isolation channel consists of an infrared light-emitting diode optically coupled to a silicon phototransistor. Input signals drive the internal infrared LEDs, while the corresponding phototransistors reproduce the switching information on the isolated side without requiring a direct electrical connection between the two circuits. The TLP291-4 integrates four independent photocoupler circuits in one package. This quad-channel architecture significantly reduces PCB area and component count compared with implementing the same isolation function using four individual photocouplers. Each phototransistor output provides a minimum collector-emitter voltage VCEO rating of 80V. The relatively high output voltage capability makes the TLP291-4 suitable for industrial interfaces, programmable logic controllers, switching power supplies, and other circuits operating with higher signal voltages. The maximum collector current IC is 50mA per channel, while the maximum input LED forward current is also 50mA. Appropriate current-limiting resistors should be used on the LED inputs according to the available drive voltage and required current transfer characteristics. The standard TLP291-4 provides a current transfer ratio (CTR) from 50% to 400% at IF = 5mA and VCE = 5V. CTR represents the relationship between input LED current and output phototransistor collector current and is an important parameter when designing the output pull-up resistance and switching thresholds. For applications requiring a more tightly specified transfer ratio, Toshiba also provides GB-ranked versions with a CTR range of 100% to 400%. Selecting an appropriate CTR rank can simplify circuit design where minimum output current or switching margin is important. The maximum collector-emitter saturation voltage VCE(sat) is 0.4V under the specified test conditions. The phototransistor output can therefore provide a practical isolated logic switching interface when used with a suitable pull-up resistor and downstream digital circuitry. The TLP291-4 provides a minimum isolation voltage of 2500VRMS for 60 seconds between the input and output sides. This galvanic isolation helps prevent unwanted ground currents and provides electrical separation between control electronics and higher-voltage or noisy circuits. The device is suitable for digital signal isolation and level shifting in systems where direct electrical connection is undesirable. Optical coupling can also help prevent ground loops and reduce the transfer of common-mode disturbances between electrically separated circuit domains. The TLP291-4 is particularly useful in Programmable Logic Controller (PLC) input and output interfaces. Its four-channel architecture allows multiple industrial control signals to be isolated using a single compact component, helping reduce PCB area in high-density I/O modules. It is also suitable for switching power supply applications where control, monitoring, status, or feedback signals require electrical isolation. Depending on the circuit architecture, individual channels can be used for enable signals, fault indications, status monitoring, and other isolated control functions. Communication applications include simplex and multiplex data transmission where moderate-speed digital signals must cross an electrical isolation barrier. The independent channels provide flexibility for implementing multiple isolated control or communication paths within a single package. The TLP291-4 operates over a wide ambient temperature range of -55°C to +110°C. This extended operating range makes the device suitable for industrial control equipment, power electronics, instrumentation, factory automation, and other systems exposed to demanding environmental conditions. The device supports major international safety standards, including recognition under UL 1577 and cUL requirements. Appropriate versions are also available with EN 60747-5-5 VDE approval, providing additional options for applications requiring certified optical isolation components. The TLP291-4 is housed in Toshiba's compact 16-pin SO16 surface-mount package. Package dimensions are approximately 10.3 × 7.0 × 2.1mm, providing four isolation channels while maintaining a low-profile package suitable for high-density PCB assemblies. The input pin arrangement uses Pins 1, 3, 5 and 7 as LED anodes and Pins 2, 4, 6 and 8 as LED cathodes. On the isolated output side, Pins 9, 11, 13 and 15 are phototransistor emitters, while Pins 10, 12, 14 and 16 are collectors. Standard tape-and-reel orderable versions of the TLP291-4 are supplied with a manufacturer package quantity of 2000 pieces, making the device suitable for automated surface-mount assembly and high-volume industrial electronics production. The combination of four independent phototransistor channels, 80V collector-emitter capability, 50mA collector current, 50% to 400% standard CTR, 2500VRMS isolation, wide -55°C to +110°C operating range, and compact low-profile SO16 construction makes the TLP291-4 an effective solution for multichannel signal isolation. The TLP291-4 is widely used in programmable logic controllers, PLC input and output modules, industrial automation equipment, switching power supplies, power supply control circuits, motor drives, inverter control systems, communication interfaces, simplex and multiplex data transmission, factory automation equipment, instrumentation systems, digital signal isolation, industrial controllers, power electronics, and general-purpose isolated interfaces. |
| Product Group | Optocoupler |
| MOQ | 2000 pcs |
| SPQ | 2000 pcs |
| Figure/Case | 16-SOIC |
| Package | T&R Pack |
 PDF Datasheet | |
| Ship From | Hong Kong |
| Shipment Way | DHL / Fedex / TNT / UPS / Others |
| Delivery Term | Ex-Works |
| Send RFQ | sales@signalhk.com |
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TLP291-4(GB-TP,E)
TLP291-4(GB-TP,E)