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SFH608-3

Manufacturer: SIEMENS

Optocouplers

Partnumber Manufacturer Quantity Availability
SFH608-3,SFH6083 SIEMENS 1820 In Stock

Description and Introduction

Optocouplers The **SFH608-3** is an optocoupler manufactured by **SIEMENS** (now part of **Infineon Technologies**). Below are its key specifications, descriptions, and features based on factual information:  

### **Specifications:**  
- **Type:** Optocoupler (Phototransistor Output)  
- **Isolation Voltage:** 5300 Vrms (min)  
- **Collector-Emitter Voltage (VCEO):** 70 V  
- **Emitter-Collector Voltage (VECO):** 7 V  
- **Collector Current (IC):** 50 mA (max)  
- **Current Transfer Ratio (CTR):** 20% to 40% (at IF = 5 mA, VCE = 5 V)  
- **Input Forward Current (IF):** 60 mA (max)  
- **Forward Voltage (VF):** 1.65 V (typical at IF = 20 mA)  
- **Response Time (tON / tOFF):** 3 μs / 4.7 μs (typical)  
- **Operating Temperature Range:** -55°C to +100°C  

### **Description:**  
The **SFH608-3** is a high-reliability optocoupler designed for signal isolation in industrial, medical, and communication applications. It consists of an **infrared LED** optically coupled to a **silicon phototransistor**, providing electrical isolation between input and output circuits.  

### **Features:**  
- **High Isolation Voltage (5300 Vrms)**  
- **Compact DIP-6 Package**  
- **Low CTR Degradation Over Time**  
- **Wide Operating Temperature Range**  
- **Suitable for High-Voltage and Noise-Prone Environments**  

This optocoupler is commonly used in **power supply feedback loops, digital logic isolation, and industrial control systems**.  

(Note: SIEMENS' optoelectronics division is now part of **Infineon Technologies**, but the original specifications remain valid.)

Application Scenarios & Design Considerations

Optocouplers

Alternative Part Number

  • PC817C --: Industry-standard phototransistor optocoupler with CTR bin C comparable to SFH608-3, widely available and pin-compatible in DIP-4.
  • LTV-817S --: DIP-4 phototransistor optocoupler with similar CTR range and isolation ratings, a common drop-in substitute for SFH608 series.
  • EL817C --: Cost-effective DIP-4 optocoupler with CTR grade C matching the SFH608-3 current transfer ratio window and similar isolation voltage.

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