Smart Bypass Diode - SM74611

SM74611 (ACTIVE)

Smart Bypass Diode

Description

The SM74611 is a smart bypass diode used in photovoltaic applications. It serves the purpose of providing an alternate path for string current when parts of the panel are shaded during normal operation. Without bypass diodes, the shaded cells will exhibit a hot spot which is caused by excessive power dissipation in the reverse biased cells. Currently, conventional P-N junction diodes or Schottky diodes are used to mitigate this issue. Unfortunately the forward voltage drop for these diodes is still considered high (~0.6V for normal diodes and 0.4V for Schottky). With 10A of currents flowing through these diodes, the power dissipation can reach as high as 6W. This in turn will raise the temperature inside the junction box where these diodes normally reside and reduce module reliability.

The advantage of the SM74611 is that it has a lower forward voltage drop than P-N junction and Schottky diodes. It has a typical average forward voltage drop of 26mV at 8A of current. This translates into typical power dissipation of 208mW, which is significantly lower than the 3.2W of conventional Schottky diodes. The SM74611 is also footprint and pin compatible with conventional D2PAK Schottky diodes, making it a drop-in replacement in many applications.

Features

  • Maximum reverse voltage (VR) of 30 V
  • Maximum forward current (IF) of 15A
  • Low average forward voltage (26mV at 8A)
  • Less power dissipation than Schottky diode
  • Lower leakage current than Schottky diode
  • Footprint and pin compatible with conventional
    D2PAK Schottky diode
  • Operating range (Tj) of –40°C to 125°C

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Parametrics Compare all products in ORing Controller

 
Vin (Min) (V)
Vin (Max) (V)
Channel(s) Controlled (#)
Design Support
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
SM74611
0.1    
30    
1    
Simulation Model    
Smart Bypass    
Catalog    
-40 to 125    
3DDPAK/TO-263    
1.50 | 1ku    

Related end equipment

  • Bypass Diodes for Photovoltaic Panels
  • Bypass Diodes for Microinverter and Power Optimizer

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