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SFH618A-2 from VISHAY

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SFH618A-2

Manufacturer: VISHAY, SIEMENS

Optocouplers

Partnumber Manufacturer Quantity Availability
SFH618A-2,SFH618A2 VISHAY, SIEMENS 284 In Stock

Description and Introduction

Optocouplers The **SFH618A-2** is an optocoupler manufactured by **SIEMENS** (now part of **Infineon Technologies**). Below are its key specifications, descriptions, and features based on factual data:

### **Specifications:**  
- **Type:** Optocoupler (Phototransistor Output)  
- **Isolation Voltage:** **5300 Vrms** (min)  
- **Current Transfer Ratio (CTR):** **20% to 40%** (at **IF = 5 mA, VCE = 5 V**)  
- **Input Forward Current (IF):** **60 mA** (max)  
- **Reverse Voltage (VR):** **6 V**  
- **Collector-Emitter Voltage (VCEO):** **70 V**  
- **Emitter-Collector Voltage (VECO):** **7 V**  
- **Switching Speed:** **3 µs** (turn-on time), **4 µs** (turn-off time)  
- **Operating Temperature Range:** **-55°C to +100°C**  

### **Descriptions:**  
- The **SFH618A-2** is a **high-reliability optocoupler** designed for signal isolation in industrial and automotive applications.  
- It consists of a **GaAs infrared LED** optically coupled to a **silicon NPN phototransistor**.  
- The device provides **electrical isolation** between input and output circuits, preventing ground loops and noise interference.  

### **Features:**  
- **High isolation voltage (5300 Vrms)** for safety-critical applications.  
- **Compact DIP-6 package** for easy PCB mounting.  
- **Wide operating temperature range** (-55°C to +100°C).  
- **Low CTR degradation** over time for long-term reliability.  
- **Suitable for digital and analog signal isolation** in power supplies, motor controls, and communication interfaces.  

For exact performance data, refer to the **official datasheet** from **Infineon Technologies** (successor to SIEMENS optoelectronics).

Application Scenarios & Design Considerations

Optocouplers

Alternative Part Number

  • PC817X2NSZ0F --: Industry-standard general-purpose optocoupler with similar CTR range and DIP-4 package, widely available and pin-compatible replacement.
  • LTV-817S --: Low-cost DIP-4 phototransistor optocoupler with comparable isolation voltage and CTR, suitable drop-in substitute for general switching applications.
  • EL817 --: Popular DIP-4 optocoupler offering similar current transfer ratio and isolation ratings, commonly used as an alternative to SFH618A series.
  • LTV-817S-TA1 --: Low-cost DIP-4 phototransistor optocoupler with similar CTR range and isolation ratings, commonly used as a drop-in replacement for SFH618A series parts.
  • EL817(C)-V --: Popular 4-pin optocoupler with CTR rank C matching the SFH618A-2 current transfer ratio, offering good availability and comparable isolation performance.

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