Texas Instruments announced the SM74611 smart bypass diode. The TI device features a standard surface-mount package and 15-A current handling capability. It is offered in a two-terminal D2PAK package that measures 10.2 mm by 9 mm by 4.5 mm. The TI SM74611 smart bypass diode is available in volume now. The Texas Instruments device is priced at $1.50 in 1,000-unit quantities.
According to Texas Instruments, the new component offers the industry’s lowest power dissipation. In a typical application, each SM74611 lowers power dissipation by 80% and reduces the operating temperature inside the junction box by 50 degrees C when compared with a similar box using three conventional Schottky diodes.
When a photovoltaic (PV) solar panel is shaded, the SM74611 active diode provides an alternate low-resistance path for string current to prevent hot spots that can damage the panel. The SM74611 protects the panel and improves PV solar panel reliability by boosting efficiency, and the reduced thermal dissipation enables more compact junction boxes with smaller heat-sinks.
Texas Instruments SM74611 Smart Bypass Diode Features
- Maximum reverse voltage (VR) of 30 V
- Maximum forward current (IF) of 15A with no avalanche effect
- Low average forward voltage (26mV at 8A)
- Lower leakage current than Schottky diode
- Footprint and pin compatible with conventional
- D2PAK Schottky diode drop-in replacement
- Operating range (Tj) of -40°C to 125°C
- 80% lower power dissipation than Schottky diodes
More info: Texas Instruments SM74611 Smart Bypass Diode (pdf)