The EL817S1(C)(TU)-F is an optocoupler (also known as an opto-isolator) manufactured by Everlight Electronics Co., Ltd. It is commonly used for isolating electronic circuits and protecting systems from high voltages or interference. This optocoupler is typically used for digital signal transmission between two isolated circuits, where the input signal is optically transmitted to the output circuit without electrical connection.
Here’s a detai LED explanation of the pin functions, packaging, and general specifications of the EL817S1(C)(TU)-F optocoupler:
Package Type and Pin Count:
The EL817S1(C)(TU)-F comes in a DIP-4 package, which means it has 4 pins. It is a standard 4-pin package for optocouplers.
Pin Function Table (4 Pins)
Pin Number Pin Name Pin Function Description 1 Anode (A) Anode of the LED (Light Emitting Diode ) inside the optocoupler. This pin is connected to the positive side of the input voltage. 2 Cathode (K) Cathode of the LED. This pin is connected to the negative side of the input voltage or to the ground of the input side. 3 Collector (C) Collector of the photo transistor . This pin connects to the output side of the optocoupler. The collector is responsible for carrying the output signal. 4 Emitter (E) Emitter of the phototransistor. This pin is typically connected to the ground or negative side of the output circuit.Circuit Principle:
The EL817S1(C)(TU)-F uses an LED (Light Emitting Diode) to optically transmit signals. The LED is connected to the input circuit and activated by an input voltage. When the LED emits light, it activates the phototransistor on the output side, which then completes the circuit and sends the signal to the output.
FAQ - Frequently Asked Questions
Q: What is the maximum input current for the EL817S1(C)(TU)-F? A: The maximum input current for the EL817S1(C)(TU)-F is typically 50 mA, but it is always recommended to check the datasheet for the specific value in your application.
Q: What is the operating temperature range for the EL817S1(C)(TU)-F? A: The EL817S1(C)(TU)-F operates within a temperature range of -55°C to 100°C.
Q: Can the EL817S1(C)(TU)-F be used for high-speed data transmission? A: The EL817S1(C)(TU)-F is suitable for moderate speed signal transmission, but for very high-speed applications, you may need to select a faster optocoupler model.
Q: How should the EL817S1(C)(TU)-F be connected in a circuit? A: The EL817S1(C)(TU)-F should be connected in a way that the LED side is connected to the input circuit, and the phototransistor side is connected to the output circuit. The LED should be driven with a suitable current-limiting resistor.
Q: What is the typical forward voltage drop of the LED in the EL817S1(C)(TU)-F? A: The typical forward voltage drop of the LED is 1.2V at a forward current of 20 mA.
Q: What is the gain (CTR) of the EL817S1(C)(TU)-F? A: The current transfer ratio (CTR) of the EL817S1(C)(TU)-F typically ranges from 50% to 600%, depending on the operating conditions.
Q: Is the EL817S1(C)(TU)-F suitable for AC signals? A: Yes, the EL817S1(C)(TU)-F can handle AC signals, but you need to use a proper resistor for current limiting and ensure that the input current is within the recommended range.
Q: What is the breakdown voltage of the EL817S1(C)(TU)-F? A: The breakdown voltage between the collector and emitter of the EL817S1(C)(TU)-F is typically 80V.
Q: Can the EL817S1(C)(TU)-F be used in power supply circuits? A: Yes, the EL817S1(C)(TU)-F can be used in power supply circuits for isolation purposes, protecting sensitive components from high voltages.
Q: What is the typical rise time for the EL817S1(C)(TU)-F? A: The typical rise time for the EL817S1(C)(TU)-F is 3 µs.
Q: Is the EL817S1(C)(TU)-F available in different package types? A: Yes, the EL817S1(C)(TU)-F is available in various package types, including through-hole (DIP) and surface-mount (SMD) versions.
Q: How do I calculate the required input current for the EL817S1(C)(TU)-F? A: The input current can be calculated using Ohm’s law, taking into account the forward voltage of the LED and the resistor value used for current limiting.
Q: What are the typical applications of the EL817S1(C)(TU)-F? A: Typical applications include signal isolation, data transmission, switching power supplies, and microcontroller interfacing.
Q: How does the optocoupler isolate circuits? A: The optocoupler isolates circuits by transmitting signals using light, which prevents electrical connection between the input and output sides.
Q: What is the isolation voltage of the EL817S1(C)(TU)-F? A: The isolation voltage is typically 5000 Vrms for the EL817S1(C)(TU)-F.
Q: Can I use the EL817S1(C)(TU)-F to drive relays? A: Yes, the EL817S1(C)(TU)-F can be used to drive relays if the current and voltage requirements are within its specifications.
Q: What is the saturation voltage of the EL817S1(C)(TU)-F when in the on state? A: The saturation voltage for the phototransistor in the on state is typically around 0.3V.
Q: Does the EL817S1(C)(TU)-F have any protection features? A: The EL817S1(C)(TU)-F does not have built-in protection features, so it is essential to use external components such as resistors and clamping diodes.
Q: How does the EL817S1(C)(TU)-F compare to other optocouplers? A: The EL817S1(C)(TU)-F is a general-purpose optocoupler, but depending on the specific needs (e.g., speed, isolation voltage), other optocouplers with different specifications may be more appropriate.
Q: What are the advantages of using an optocoupler like the EL817S1(C)(TU)-F in my design? A: The primary advantages include electrical isolation between circuits, protection from voltage spikes, noise immunity, and compact integration for signal transmission.
The provided information should give you a thorough understanding of the EL817S1(C)(TU)-F optocoupler's pinout and usage.
