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The String Combiner Box, beside its main function of combining the outputs of a number of photovoltaic panel strings into one or two outputs to feed the main inverter, also provides overcurrent and overvoltage protection, arc fault detection and surge protection as well as current and voltage monitoring for each string.

In addition, to comply with provisions in section 690.12 of US national electric codes (NEC) 2014, many combiner boxes implement the Rapid Shutdown function  required in photovoltaic (PV) installations mounted on buildings or rooftops to  mitigate electrical and fire hazard for first responders and can also have means to exchange data and control information with a central server.

With our range of high-performance STM32 Microcontrollers, flexible multi-protocol power line communication (PLMs) and wireless connectivity solutions as well as metering ICs and high-precision operational amplifiers for current and voltage measurement we can help developers design high-efficiency String Combiner Boxes that meet safety and fire regulations requirements

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Technical Documentation

    • Description Version Size Action
      AN4653
      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process
      1.0
      267.34 KB
      PDF
      AN4653

      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process

    • Description Version Size Action
      DN0010
      Adapting ST power line modem evaluation boards to communicate over a DC bus
      1.1
      405.64 KB
      PDF
      DN0010

      Adapting ST power line modem evaluation boards to communicate over a DC bus

Presentations & Training Material

    • Description Version Size Action
      EEPROM 2 Mbit highest density memories 1.0
      2.49 MB
      PDF

      EEPROM 2 Mbit highest density memories

Publications and Collaterals

    • Description Version Size Action
      ST Diodes Finder : the new app for Android and iOS 2.0
      1.46 MB
      PDF
      Turnkey PLC chipset for smart-energy infrastructure 10.2017
      775.07 KB
      PDF

      ST Diodes Finder : the new app for Android and iOS

      Turnkey PLC chipset for smart-energy infrastructure

    • Description Version Size Action
      EEPROM selection guide 2.0
      843.56 KB
      PDF

      EEPROM selection guide

    • Description Version Size Action
      STM32F3 series - Mainstream 32-bit MCUs 17.09
      2.18 MB
      PDF

      STM32F3 series - Mainstream 32-bit MCUs

Development Tools

    • Part Number

      Diode product finder application for Android and iOS

      STM32 and STM8 product finder for mobile devices and desktops

MEMS and Sensors

Part number Description
HTS221 Capacitive digital sensor for relative humidity and temperature
IIS2DH 3-axis digital accelerometer, ultra low-power high performance MEMS motion sensor
IIS3DHHC High-resolution, high-stability 3-axis digital inclinometer for industrial applications
LPS22HB Ultra-compact piezoresistive absolute pressure sensor, 260-1260 hPa, digital output barometer, full-mold, holed LGA package (HLGA)
STLM20 Analog temperature sensor, ultra-low current 2.4 V, high precision
STTS751 2.25 V low-voltage local digital temperature sensor
Part number
Capacitive digital sensor for relative humidity and temperature
3-axis digital accelerometer, ultra low-power high performance MEMS motion sensor
High-resolution, high-stability 3-axis digital inclinometer for industrial applications
Ultra-compact piezoresistive absolute pressure sensor, 260-1260 hPa, digital output barometer, full-mold, holed LGA package (HLGA)
Analog temperature sensor, ultra-low current 2.4 V, high precision
2.25 V low-voltage local digital temperature sensor

Power Management

Part number Description
ALTAIR04-900 Off-line all-primary-sensing switching regulator
ALTAIR05T-800 Off-line all-primary-sensing switching regulator
L6985F 38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current
L6986F 38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
L7985 2A step-down switching regulator
L7986 3A step-down switching regulator
L7987 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
Part number
Off-line all-primary-sensing switching regulator
Off-line all-primary-sensing switching regulator
38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current
38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
2A step-down switching regulator
3A step-down switching regulator
61 V 3 A asynchronous step-down switching regulator with adjustable current limitation

Protection Devices

Part number Description
1.5KE Transil 1500 W
BZW50 5000 W TVS
P6KE 600 W TVS in DO-15
SM15T Transil 1500W
SM6T 600 W TVS in SMB
SMBJ 600 W TVS in SMB
STIEC45-33AS Transil (TVS) for IEC 61000-4-5 compliance
Part number
Transil 1500 W
5000 W TVS
600 W TVS in DO-15
Transil 1500W
600 W TVS in SMB
600 W TVS in SMB
Transil (TVS) for IEC 61000-4-5 compliance