Product Matrix

Current Sensors

Silicon Labs' isolated AC and high-side DC current sensors provide current sensing solutions for a wide range of power applications. The Si85xx family is ideal for a broad range of applications including ac-dc switching power supplies, isolated dc-dc supplies, UPS systems, motor control and electronic lighting ballasts.

Si850x/1x AC current sensors Si8540 High-side DC current sensor

Application Diagram: Power Delivery System
 

Block Diagram


Features

Isolated AC Current Sensors (Si850x/1x)
5, 10 and 20 A full-scale versions, 2 VPP output swing 
Available 5 kV isolation rating
±5% measurement accuracy 
Low loss: < 1.3 mΩ 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 
 
High-Side DC Current Sensor (Si8540)
+5 to +36 V supply operation
0.2% full scale accuracy
90 μA max supply current
9 μA shutdown current 
-40 to +85 ºC 

Applications

Power supplies
Motor controls
Lighting equipment
Industrial equipment
Battery chargers
Smart battery packs
UPS Sytems

Technologies

Proprietary, ultra low-loss inductive sensing technology for high measurement accuracy and low-noise output signal.  No external components except for VDD bypass cap.

Resources

Documentation
  
  
  
  
  
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Product Pricing and
Availability

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Product Matrix

Part NumberAvailable DocumentsFull Scale Current (A)Initial Accuracy %Temp RangeOutput ModeIsolation RatingPin 7 FunctionPackageDev Kit 
Si8501Data Sheet55%-40 to 125 ºCSingle1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8502Data Sheet105%-40 to 125 ºCSingle1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8503Data Sheet205%-40 to 125 ºCSingle1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8511Data Sheet55%-40 to 125 ºCPing-Pong1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8512Data Sheet105%-40 to 125 ºCPing-Pong1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8513Data Sheet205%-40 to 125 ºCPing-Pong1 or 5 kV rmsIntegrator Reset Time Programming Input 12-pin QFN/20-pin SOICSample
Buy
Si8517Data Sheet55%-40 to 125 ºCPing-Pong with FAULT output1 or 5 kV rmsFault Output12-pin QFN/20-pin SOIC
Si8518Data Sheet105%-40 to 125 ºCPing-Pong with FAULT output1 or 5 kV rmsFault Output12-pin QFN/20-pin SOIC
Si8519Data Sheet205%-40 to 125 ºCPing-Pong with FAULT output1 or 5 kV rmsFault Output12-pin QFN/20-pin SOIC
Si8540Data Sheet0.1 to 10 A0.2%-40 to 85 °CCurrent--5-pin SOT or 8-pin SOIC

 

Isolated AC Current Sensors
The Si850x/1x products are unidirectional ac current sensors available in 10 and 20 A versions and provide a large output signal level of 2.0 V at fullscale output range. These products offer size and performance advantages over current transformers, Hall effect devices, DCR circuits and other approaches. The Si850x/1x are extremely low loss, adding less than 1.3 mΩ of series resistance and less than 2 nH of series inductance in the sensing path at 25 ºC. Current-sensing terminals are isolated from the other package pins to a maximum voltage of 1KVDC.

High-Side DC Current Sensor
The Si8540 is a uni-directional, high-side current sense amplifier for use in applications that require current monitoring and control. This cost-effective, high-side current sense amplifier operates with common mode voltages to 36 V (max). It operates over a frequency range of DC-20 KHz, and can be configured to measure full-scale currents from 100 mA to 10 A.