​Si850x/1x AC Current Sensors

The Silicon Labs Si850x/1x is an inductive current sensor based on a Rogowski coil, a form of coupled inductor. The sensor consists of an embedded metal slug embedded in the package that induces and voltage equal Lmdi/dt into a pick-up coil located on a nearby silicon die. The induced is processed by an analog integrator, which "reconstructs" the current signal sensed by the metal slug. The signal is then temperature compensated and adjusted for offset, then sent to the output pin by way of a buffer. The output swing is nominally 0 to 2 V, but can be higher provided the signal does not clip from too low a VDD. The Si850x/1x requires resetting after every measurement, which is executed using gate control signals already in the system and without external components.
 
 

Features

  • Available in 5 kV isolation rating
  • ±5% measurement accuracy
  • Low loss: < 1.3 mO series resistance
  • Leading-edge noise suppression
  • “Ping-Pong” output mode allows one Si851x to replace two current transformers in full-bridges
  • High-side or low-side current sensing
 
 

Applications

Product Matrix
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Part NumberDatasheetPin 7 FunctionPackage TypeDev KitTemperature RangeOutput ModeIsolation RatingFull Scale CurrentInitial Accuracy
Si8501-B-GM
Buy
Sample

Integrator Reset Time Programming InputQFN12; SOIC20-40 to 125 °CSingle1 kV rms; 5 kV rms5 A5%
Si8501-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CSingle1 kV rms5 A5%
Si8501-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CSingle5 kV rms5 A5%
Si8502-B-GM
Buy
Sample

Integrator Reset Time Programming InputQFN12; SOIC20-40 to 125 °CSingle1 kV rms; 5 kV rms10 A5%
Si8502-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CSingle1 kV rms10 A5%
Si8502-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CSingle5 kV rms10 A5%
Si8503-B-GM
Buy
Sample

Integrator Reset Time Programming InputQFN12; SOIC20-40 to 125 °CSingle1 kV rms; 5 kV rms20 A5%
Si8503-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CSingle1 kV rms20 A5%
Si8503-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CSingle5 kV rms20 A5%
Si8511-B-GM
Buy
Sample

Integrator Reset Time Programming InputQFN12; SOIC20-40 to 125 °CPing-Pong1 kV rms; 5 kV rms5 A5%
Si8511-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CPing-Pong1 kV rms5 A5%
Si8511-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CPing-Pong5 kV rms5 A5%
Si8512-B-GM
Buy
Sample

Integrator Reset Time Programming InputSOIC20-40 to 125 °CPing-Pong1 kV rms; 5 kV rms10 A5%
Si8512-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CPing-Pong1 kV rms10 A5%
Si8512-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CPing-Pong5 kV rms10 A5%
Si8513-B-GM
Buy
Sample

Integrator Reset Time Programming InputQFN12; SOIC20-40 to 125 °CPing-Pong1 kV rms; 5 kV rms20 A5%
Si8513-C-IM
Integrator Reset Time Programming InputQFN12-40 to 125 °CPing-Pong1 kV rms20 A5%
Si8513-C-IS
Integrator Reset Time Programming InputSOIC20-40 to 125 °CPing-Pong5 kV rms20 A5%
Si8517-B-GM
Fault OutputQFN12; SOIC20-40 to 125 °CPing-Pong with Fault output1 kV rms; 5 kV rms5 A5%
Si8517-C-IM
Fault OutputQFN12-40 to 125 °CPing-Pong1 kV rms5 A5%
Si8517-C-IS
Fault OutputSOIC20-40 to 125 °CPing-Pong1 kV rms5 A5%
Si8518-B-GM
Fault OutputSOIC20-40 to 125 °CPing-Pong with Fault output1 kV rms; 5 kV rms10 A5%
Si8518-C-IM
Fault OutputQFN12-40 to 125 °CPing-Pong1 kV rms10 A5%
Si8518-C-IS
Fault OutputSOIC20-40 to 125 °CPing-Pong5 kV rms10 A5%
Si8519-B-GM
Fault OutputSOIC20-40 to 125 °CPing-Pong with Fault output1 kV rms; 5 kV rms20 A5%
Si8519-C-IM
Fault OutputQFN12-40 to 125 °CPing-Pong1 kV rms20 A5%
Si8519-C-IS
Fault OutputSOIC20-40 to 125 °CPing-Pong5 kV rms20 A5%
    The S50x is a single output device whereas the Si851x is a two-output, "Ping-Pong" mode device for full bridge applications, where the current measured in each leg of the bridge has its own output pin. This enables the Si851x to replace two CTs and associated discrete components in full bridge applications. Package options include a 4 mm x 4 mm x 1 mm QFN (1 kV rated isolation) and a 16 SPW (5 kV rated isolation).

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