LTV-817S

Optoisolators, also known as optocouplers, opto-isolators or photo-couplers, are used to electrically isolate two circuits while providing a communication link between them without the use of an intermediate electrical connection. The LTV-817S is an optoisolator with a transistor-type, photovoltaic output that offers high reliability, low cost, and various electrical isolation levels. This optoisolator is well suited for use in both commercial and industrial applications.

Application Field

The LTV-817S is most suitable for applications where isolation between two circuits is required to protect against electrical interference such as noise, surges, or other transient phenomena. It can be used in a variety of interesting applications, such as for amplifier or DAC isolation, motor control protection, onboard or isolated controllers, instrumentation and process control, as well as in medical or safety equipment. It can also be used to provide linear signal conditioning or drive multiplex displays.

Working Principle

The basic device of the LTV-817S optoisolator consists of an LED, coupled with a phototransistor, and a power transistor. The LED is driven by an input voltage, which produces light in response to current passing though it. This light is then directed at the phototransistor, which produces an electrical output in response. The power transistor is driven by this output signal, which in turn is used to drive the output circuit. This optoisolator is well suited to driving turn-on and turn-off signals, as well as logic level switching applications.

The device has a very high optical isolation voltage of 4000V (minimum). This allows it to provide a very high degree of insulation between two circuits, enabling reliable signal transmission even in situations where significant electrical interference is present or when one circuit is operating at a high voltage potential. In addition, the device has a low NEP (Noise Equivalent Power) characteristic, which helps to reduce the amount of stray light, thus reducing the amount of interference and allowing for more accurate signal transmission.

The LTV-817S also has a high current transfer ratio (CTR) of 200%. This allows it to transfer higher levels of current than normal, making it suitable for applications where greater amounts of current are required. The operating temperature range of this optoisolator is also very wide, ranging from -55°C to 125°C.

Overall, the LTV-817S is an excellent optoisolator for a wide range of applications, offering high reliability, low cost, and a voltage-isolation of up to 4000V. It is suitable for amplifier and DAC isolation, motor control protection, onboard or isolated controllers, instrumentation and process control, as well as in medical or safety equipment. The device also has the ability to efficiently drive multiplex displays and linear signal conditioning.