I. Product Overview
The AK10-066C is a member of the AK10 series of high-current, bidirectional Transient Voltage Suppressors (TVS). Designed primarily for protecting AC and DC systems in harsh surge environments, it features excellent clamping characteristics that suppress surge-induced overvoltage spikes to very low levels, effectively safeguarding downstream components. The device supports series and parallel configurations, enabling customized surge protection solutions with higher voltage ratings and greater surge discharge capabilities.
II. Core Functions and Positioning
2.1 Functional Principle: Transient Overvoltage Suppression
When the circuit encounters sudden high-voltage spikes—such as lightning-induced surges, inductive load switching, or ESD events—the AK10-066C enters avalanche conduction at nanosecond speeds. It clamps the transient high voltage to a safe level while shunting large surge currents to ground, thereby protecting downstream ICs, power components, and ports from damage caused by high-voltage surges.
2.2 Product Positioning: High-Energy, High-Current TVS
- The AK10 series features an axial-leaded package with formed leads, specifically designed for 10kA-level lightning surge scenarios; the symmetrical lead design facilitates easy soldering.
- It utilizes a glass-passivated chip junction for high reliability and offers a significantly smaller footprint compared to traditional discrete high-power protection devices.
- It is suitable for power circuit protection in industrial and new energy equipment that must directly withstand high-current surges (such as the IEC 61000-4-5 8/20μs waveform).
III. AK10-066C Key Electrical Parameters
| Parameter | Value | Description |
| VRWM | 66V | Maximum continuous operating voltage of the system |
| VBR@IT | 72-80V | Test current IT=10mA |
| VC | 120V | Under Ipp=10kA surge condition |
| Ipp | 10kA | Test waveform: 8/20μs (IEC61000‑4‑5) |
| IR | 10μA | - |
| Polarity | Bidirectional | - |
IV. AK10-066C Key Features
4.1 Ultra-High Surge Withstand Capability: 10kA @ 8/20μs, meeting lightning surge immunity requirements for industrial and new energy systems; also complies with IEC-61000-4-2 ESD protection standards (15kV air discharge, 8kV contact discharge).
4.2 Low Clamping Voltage: The clamping voltage (VC) is only 120V under high-current surges, providing ample protection margin for downstream circuitry. 4.3 Bidirectional Protection: Features a bidirectional avalanche structure; suitable for direct use in AC circuits and DC circuits subject to reverse transients.
4.4 Glass-Passivated Chip: Exhibits a sharp breakdown knee and low leakage current; offers high device reliability and is free from the aging and degradation issues associated with MOV (Metal Oxide Varistor) devices.
4.5 Halogen-Free Compliance: Meets RoHS and IEC 61249-2-21 halogen-free requirements; features symmetrical bent leads for easy PCB wave soldering assembly.
4.6 Flexible Expansion: Supports series and parallel configurations to meet customized protection needs for higher voltages and greater surge currents.
V. Application Areas and Design Analysis
The AK10-066C is designed primarily for high-energy surge protection and is suitable for equipment requiring compliance with IEC 61000-4-5 high-current lightning surge tests.
Typical scenarios include:
5.1 New Energy Storage Systems and BMS (Battery Management Systems)
Outdoor deployment of energy storage equipment makes it highly susceptible to lightning surges coupled from the power grid. Using the AK10-066C for DC bus surge protection offers advantages over varistors—specifically, the absence of aging and more stable clamping—ensuring reliable long-term operation.
5.2 PV Inverters and Energy Conversion Systems
Common-mode and differential-mode surge suppression for PV array terminals and DC buses (specifically for 66V-class DC circuits). Multiple units can be connected in series to accommodate higher PV voltage levels.
5.3 Charging Piles (AC Charging Stations)
High-energy surge protection for auxiliary DC circuits on the AC input side, guarding against grid-side induced lightning surges.
5.4 Communication Base Stations and Outdoor Small Cell Equipment
Protection at the power input of outdoor communication equipment against induced lightning surges.
5.5 Industrial Automation Equipment
High-power PLC power inputs and servo drive DC buses.
✅ Design Recommendations
The AK10-066C has relatively high junction capacitance; it should be used only in power supply circuits and must not be used on high-speed signal lines. During PCB layout, minimize the trace length between the TVS and the protected port to reduce lead inductance.
Conclusion
The AK10-066C high-current TVS diode features an ultra-high surge withstand capability of 10kA, low clamping voltage, bidirectional protection, and wide temperature adaptability, offering reliable transient overvoltage protection for demanding applications in sectors such as industrial equipment, new energy, and telecommunications.
About Semiware
As a professional provider of circuit protection solutions, Semiware offers standardized products, free sample evaluation, and one-stop technical support (including EMC solution optimization and design guidance). Please contact us for product specifications, detailed datasheets, or bulk purchasing inquiries to receive professional technical consultation and project support.
