ESD TVS Diode Selection Calculator
Calculate TVS diode clamping voltage, breakdown voltage, peak pulse current, and power rating for ESD protection circuit design.
Formula
Reference: JEDEC JESD22-A114 HBM / IEC 61000-4-2
How It Works
Electrostatic Discharge (ESD) protection using Transient Voltage Suppressor (TVS) diodes is critical in electronic circuit design. These specialized diodes provide robust protection against high-voltage, short-duration electrostatic events that can damage sensitive semiconductor components. The key design parameters include breakdown voltage (VBR), clamping voltage (Vc), and peak current handling capabilities.
Worked Example
Problem: Select a TVS diode to protect a 3.3V microcontroller input from ESD events with 2kV Human Body Model (HBM) stress Solution: 1. Calculate VBR: VBR = 3.3V × 1.1 = 3.63V 2. Calculate Vc: Vc = 3.63V × 1.3 = 4.72V 3. Calculate HBM Peak Current: Ipeak = 2000V/1500Ω = 1.33A 4. Calculate Peak Power: Ppk = 4.72V × 1.33A = 6.28W 5. Select TVS diode with Vc < 3.3V and Ipeak > 1.33A
Practical Tips
- ✓Always choose TVS diode with lower clamping voltage than protected device rating
- ✓Consider circuit board layout to minimize ESD event energy
- ✓Use multiple TVS diodes for comprehensive protection in complex circuits
Common Mistakes
- ✗Selecting a TVS diode with clamping voltage higher than device input voltage
- ✗Ignoring peak current requirements
- ✗Not considering capacitance impact on high-speed circuits
Frequently Asked Questions
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