Semikron SKiiP35NAB12T4V1: A Solder-Free 1200V 35A MiniSKiiP IGBT Module for Industrial Drives
SKiiP35NAB12T4V1 Semikron 1200V 35A MiniSKiiP IGBT Module
The Semikron SKiiP35NAB12T4V1 is a Converter-Inverter-Brake (CIB) MiniSKiiP module built on Trench IGBT4 technology, engineered for high-performance motor drives. Rated at 1200V and 35A, this power module utilizes solder-free spring connections to eliminate thermal mechanical stress, directly addressing how to prevent vibration-induced connection failure in industrial environments.
Key specs: 1200V | 35A | VCE(sat) 1.85V
Key benefits: Solder-free pressure contacts for superior thermal fatigue resistance; low conduction losses via Trench IGBT4 chips.
Download Official Datasheet (PDF)
Around the UVP: Solder-Free Spring Connections
In standard power modules, solder joints between the Direct Bonded Copper (DBC) substrate and the pins are subjected to high thermal cycling stress. This stress leads to package degradation and eventual IGBT failures. The SKiiP35NAB12T4V1 bypasses this failure mechanism entirely by using pressure-contact spring connections. These springs act as flexible shock absorbers; just like vehicle suspension springs cushion a car on a bumpy road, the spring contacts absorb the micro-expansions and contractions of the silicon and copper under thermal swings, maintaining solid electrical contact without cracking. This technology significantly enhances the power cycling capability of the system. Inside the module, high-grade silicone gel secures dielectric insulation and environmental protection under high electrical fields.
The Trench gate structure minimizes the collector-emitter saturation voltage VCE(sat), which sits at a low 1.85V (typical at I_C = 35A, T_j = 25°C). A lower VCE(sat) reduces conduction losses during the on-state, which is critical for overall efficiency. To read more about how trench gate structures have evolved to reduce losses, see this analysis on trench gate evolution.
The module incorporates an internal NTC thermistor close to the IGBT chips. This allows the control loop to monitor real-time junction temperature drifts. The thermal resistance from junction to heatsink (Rth(j-s)) is optimized through the baseplate-less design of the MiniSKiiP package. By pressing the substrate directly against the heatsink, thermal barriers are minimized. For a guide on leveraging thermal telemetry, check out our resource on integrated NTC sensors.
Optimized Application Scenarios
- Variable Frequency Drives (VFDs): The integrated CIB topology provides a complete inverter stage, matching the high-efficiency demands of three-phase AC motors.
- Solar Inverters: Low conduction losses ensure optimal energy conversion efficiency in grid-tied renewable systems.
- Industrial UPS Systems: High reliability and compact mounting allow for space-saving power backup units.
- Servo Drives: Solder-free spring contacts endure the constant, rapid thermal cycling typical of dynamic servo positioning systems.
Best match: This module is optimal for compact industrial motor controllers requiring high reliability and simplified thermal management.
Key Specifications Parameter Table
| Absolute Maximum Ratings (Tj = 25°C unless otherwise specified) | |
|---|---|
| Collector-Emitter Voltage (VCES) | 1200 V |
| Continuous Collector Current (IC) @ Ts = 70°C | 35 A |
| Rectifier Reverse Voltage (VRRM) | 1600 V |
| Rectifier Forward Current (IFAV) @ Ts = 70°C | 35 A |
| Electrical Characteristics (Inverter IGBT, Tj = 25°C) | |
| Collector-Emitter Saturation Voltage (VCE(sat)) @ IC = 35 A | 1.85 V (Typical) |
| Turn-on Energy (Eon) @ Tj = 150°C, VCC = 600 V | 4.6 mJ (Typical) |
| Turn-off Energy (Eoff) @ Tj = 150°C, VCC = 600 V | 4.1 mJ (Typical) |
| Thermal and Mechanical Characteristics | |
| Thermal Resistance Junction to Heatsink (Rth(j-s)) per IGBT | 0.85 K/W |
| Isolation Voltage (Visol) (AC, 1 min) | 2500 V |
| Package Type | MiniSKiiP 3 |
Engineer FAQ
Q1: How is the thermal resistance calculated for a baseplate-less module like the SKiiP35NAB12T4V1?
A1: Without a copper baseplate, the thermal path is defined directly from junction to heatsink (Rth(j-s)). The datasheet specifies Rth(j-s) = 0.85 K/W per IGBT. Users must calculate heatsink temperature directly under the module using the thermal paste thickness and thermal conductivity (typical λ = 1 W/mK).
Q2: What are the mounting requirements to ensure reliable contact with the SKiiP35NAB12T4V1?
A2: The module relies on pressure contact force from a mounting lid. The target mounting torque is 2.0 to 2.5 Nm, which ensures uniform spring compression and optimal thermal contact with the heatsink interface.
Q3: What are the typical switching losses for the inverter IGBTs?
A3: At VCC = 600V, IC = 35A, Tj = 150°C, and RG = 12 Ω, the typical turn-on energy (Eon) is 4.6 mJ and turn-off energy (Eoff) is 4.1 mJ.
Design Enablement
By replacing soldered joints with elastic spring contacts and utilizing high-efficiency Trench IGBT4 chips, the SKiiP35NAB12T4V1 enables highly integrated, reliable, and compact power designs. This configuration provides engineers with a mechanically robust platform to optimize efficiency in demanding industrial motor control systems.