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    TLP160G device package

    TLP160G device package

    TLP160G pin configuration

    TLP160G pin configuration

    TLP160G schematic symbol

    TLP160G schematic symbol

    Photo-couplers or opto-couplers are electronic components which are used for transferring signals between two isolated circuits. Opto-couplers are commonly used in noise-sensitive circuits to provide electrical isolation between two parts of the circuit. One side of the opto-coupler consists of an LED which converts electrical signals into light signals whereas the other side consists of a photosensitive semiconductor switch which converts the light signals back to electrical signals. The infrared semiconductor switch can be a transistor, Darlington pair, TRIAC, or an SCR.  

    What is TLP160G?

    The TLP160G is a photo-TRIAC photo-coupler manufactured by Toshiba. This small outline photo-coupler is ideal for surface mount assembly. The TLP160G device package consists of a Gallium Arsenide infrared LED which is optically coupled to a photo-sensitive TRIAC.  

    Pin Configuration

    The pin configuration and pin description of the TLP160G is provided as following:

    Pin number Pin description
    1 Anode of LED (+ve terminal)
    3 Cathode of LED (-ve terminal)
    4 TRIAC output terminal 1
    6 TRIAC output terminal 2


    • Peak off state voltage: 400V
    • LED trigger current: 10mA
    • On-state current: 70mA
    • Isolation voltage: 2500 Vrms
    • UL recognized: UL1577
    • Small outline photo-coupler
    • Infrared photo-sensitive TRIAC
    • Gallium Arsenide infrared LED


    The applications in which the TLP160G photo-coupler is commonly used are listed as following:

    • TRIAC drive
    • Programmable controllers
    • AC output modules
    • Solid state relays


    The major technical specifications of the TLP160G are provided as following:

    • LED forward current: 50mA
    • LED peak forward current: 1000mA
    • LED reverse voltage: 5V
    • LED junction temperature: 125OC
    • TRIAC off-state output voltage: 400V
    • TRIAC On-state RMS current: 70mA
    • TRIAC peak on-state current: 2000mA
    • TRIAC junction temperature: 115OC
    • Isolation voltage: 2500 VRMS
    • Internal capacitance: 30pF
    • Holding current: 0.6mA
    • Isolation resistance: 1014 Ohm
    • Turn-on time: 30ms

    How TLP160G work?

    TRIACS are solid state electronic devices which are very commonly used for controlling the flow of AC power. The major advantages of a TRIAC include noiseless function, rebound-free control, automatic turn-off at zero current level, and long life span. TRIACS can be found in most of the AC powered devices like actuators, heaters, fans, motor drives, pumps, and soft starters.

    TRIACs are controlled by providing current pulses to the gate. The TRIAC starts conducting when the gate current is larger than a threshold value. TRIACs can be easily controlled using microcontrollers. However, the microcontroller cannot be directly connected to the TRIAC’s gate. The microcontroller operates at low DC voltage levels, whereas the TRIAC operates on high AC voltage levels. This can cause damage to the low voltage DC circuitry, therefore, isolation is required. The photo-TRIAC optocouplers are used to provide the required isolation between the control circuit and the TRIAC circuit.

    The optocoupler based control of power TRIAC can be seen in the schematic below:

    TLP160G TRIAC control using photo-TRIAC optocoupler

    Keywords and Tags

    • TLP160G
    • TRIAC coupler
    • TRIAC optocoupler
    • TRIAC photocoupler
    • TRIAC opto isolator
    • Toshiba optocoupler
    • Toshiba opto isolator

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