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Reverse Current Protection for Sensors – DIY Guide

reverse current protection for sensors

🔌 The Problem: Reverse Current in Sensor Circuits

 

In many sensor-based projects, especially where microcontrollers or analog circuits are involved, reverse current can be a silent killer. If your sensor’s output is tied to a power source that turns off while the rest of the circuit remains active, current can flow backward through the sensor—damaging it permanently.

 


🛠️ The Solution: Add Reverse Current Protection

 

A simple fix is to place a Schottky diode or a P-channel MOSFET in series with the sensor’s power line. This blocks current from flowing in the wrong direction while allowing normal operation. Use low forward-voltage drop components to minimize power loss.

 


💡 Practical Example

 

Say you’re using a 5V IR sensor module on a shared power bus. When the controller shuts off but the 5V supply remains active, reverse current can flow through the sensor. Add a Schottky diode (like SS14) on the VCC line to protect it.

 


📐 Sample Calculation

 

If the sensor draws 100 mA and you use a SS14 diode with a 0.4V drop:

Power loss = V × I = 0.4V × 0.1A = 0.04W

A negligible loss for most applications, but vital for protection.

 


🛒 Product Suggestion

 

Search for “Schottky diode” or “MOSFET”—all proudly Made in India:

 

🔗 Search Schottky Diode

🔗 Search MOSFET

 

👉 Shop now at SmartXProKits.in
🇮🇳 Support our work and India’s innovation—buy from our Make in India site!

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