Blog Intro: Within home appliance inverter systems, electrostatic discharge (ESD) is an easily overlooked root cause of component failure. In this lab case post, we walk through the rigorous ESD reliability validation of our SIP35 packaged IPM module for Xiaomi air conditioner project, and why ESD robustness matters for consumer power semiconductors.
Project Overview: Xiaomi Inverter Air�Conditioner Program
Xiaomi inverter air conditioners adopt full DC inverter architecture, delivering high energy efficiency, fast heating & cooling performance, targeting global household consumer markets. This sets high reliability requirements for core internal components — the IPM (Intelligent Power Module).
As the "heart" driving compressor operation, the IPM integrates IGBTs, free wheeling diodes and gate drive circuits. During manufacturing assembly, field maintenance and end user handling, human body static electricity can couple into module pins. It may trigger latent damage, intermittent malfunctions or permanent burnout. Therefore, ESD validation acts as a mandatory gate before component adoption.
Our SYIM756C-SST (SIP35 package) is selected for this project, and needs to fully comply with Xiaomi’s customized ESD test specification.
Custom HBM ESD Test Requirements from Xiaomi
Xiaomi defined strict test criteria for power module qualification:
- Start test voltage: 2000V HBM, step up by 500V until device failure occurs
- Post stress full pin inspection required after every ESD shot cycle
- Detect latent soft damage to avoid hidden risks carried over to mass production
Lab Test Execution
Our engineering team performed Human Body Model ESD verification on SYIM756C-SST sample units.
1.Test configuration
- Test voltage: ±2000V
- Pulse interval: 1 second
- Positive & negative pulses: 3 times each
- Test pin combinations: signal to reference pin, signal to signal pin pairs, covering real world static contact scenarios.
2.Post shot verification workflow
After each group of ESD impulses, engineers carried out comprehensive re-checks:
- Continuity test for all pins
- Withstand voltage parameter calibration
- Full functional validation of internal IGBT, diodes and drive resistor circuits
- Focus check for invisible latent ESD induced degradation
Test Results & Key Takeaways
All ESD test items were fully passed by SYIM756C-SST.
- All measured pins maintain normal continuity status
- No drift on withstand voltage parameters
- Power conversion and gate drive functions keep intact, no performance degradation or device breakdown caused by static stress.
The result proves this SIP35 IPM owns sufficient anti static capability, capable of resisting common ESD events during home appliance assembly and end user application.
Project Outlook
IPM ESD robustness directly influences production line yield and long term service life of finished air conditioner units.
Passing this stringent ESD qualification clears the component admission barrier for Xiaomi air conditioner project, laying solid reliability foundation for subsequent sample iteration, system joint debugging and mass product introduction.
Our technical team will keep completing follow up reliability test sequences, optimizing component performance to adapt to complex real world operating conditions of household inverter air conditioners.
All experimental data in this article is sourced from official test reports. Feel free to contact us if you would like to review the full report.