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SFH610A-3 from SIEMENS

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SFH610A-3

Manufacturer: SIEMENS, FAIRCHILD

Optocouplers

Partnumber Manufacturer Quantity Availability
SFH610A-3,SFH610A3 SIEMENS, FAIRCHILD 222 In Stock

Description and Introduction

Optocouplers The **SFH610A-3** is an optocoupler manufactured by **Fairchild Semiconductor** (now part of **ON Semiconductor**). Below are its key specifications, descriptions, and features based on factual data:

### **Specifications:**  
- **Type:** Phototransistor Output Optocoupler  
- **Isolation Voltage:** 5,300 Vrms  
- **Collector-Emitter Voltage (VCEO):** 70 V  
- **Collector Current (IC):** 50 mA  
- **Current Transfer Ratio (CTR):** 20% to 300% (at IF = 5 mA, VCE = 5 V)  
- **Input Forward Current (IF):** 60 mA (max)  
- **Forward Voltage (VF):** 1.25 V (typical at IF = 10 mA)  
- **Response Time (tON / tOFF):** 3 μs / 4 μs (typical)  
- **Operating Temperature Range:** -55°C to +100°C  

### **Description:**  
The **SFH610A-3** is a high-reliability optocoupler featuring an **infrared LED** optically coupled to a **silicon phototransistor**. It provides electrical isolation between input and output circuits, making it suitable for noise suppression, signal transmission, and voltage level shifting in industrial and consumer applications.  

### **Features:**  
- **High Isolation Voltage (5.3 kVrms)**  
- **Compact 4-pin DIP package**  
- **Wide CTR range (20% to 300%)**  
- **Fast switching response**  
- **UL, CSA, and VDE recognized**  
- **Pb-free and RoHS compliant**  

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

(Note: Fairchild Semiconductor was acquired by ON Semiconductor in 2016, but legacy part numbers like SFH610A-3 may still be referenced under the original manufacturer name.)

Application Scenarios & Design Considerations

Optocouplers

Alternative Part Number

  • PC817X3NSZ0F --: Industry-standard optocoupler with CTR bin comparable to the SFH610A-3, widely available and pin-compatible in most DIP-4 sockets.
  • LTV-817S-TA1 --: Low-cost DIP-4 phototransistor optocoupler with similar CTR range and isolation ratings, suitable drop-in replacement for general switching applications.
  • EL817(C) --: Popular 4-pin optocoupler with CTR grade matching the SFH610A-3, offering good availability and comparable electrical characteristics.
  • LTV-817S-TA1-C --: Widely available DIP-4 phototransistor optocoupler with CTR rank C matching the SFH610A-3 range, suitable drop-in replacement with similar isolation ratings.
  • EL817(C)-V --: Cost-effective DIP-4 optocoupler with CTR bin C (100-200%) and 5kV isolation, functionally equivalent to SFH610A-3 for most switching applications.

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