What are the packaging options for IGBT?

The packaging forms of IGBT (Insulated Gate Bipolar Transistor) are diverse and highly specialized, and their selection directly relates to the power processing capability, heat dissipation performance, reliability, and application scenarios of the devices. The following analysis is conducted from four dimensions: packaging form, technical characteristics, application scenarios, and development trends:
1、 Packaging Form Classification: From Discrete Devices to Modular Integration
Discrete Device Packaging
TO series: such as TO-247 (single tube IGBT, suitable for photovoltaic inverters), TO-220 (medium power, used for industrial power supply), TO-263 (D2PAK, high power density, used for motor drive).
SMD package: such as SOT-227 (surface mount, suitable for automated production), but limited by heat dissipation capability, mainly used in low-voltage and low current scenarios.
Modular packaging
Standard modules: such as Infineon's 62mm package and Mitsubishi's DV70 series, which achieve high current output (up to thousands of amperes) through multi chip parallel connection, are widely used in new energy vehicle main inverters and wind power converters.
Intelligent Power Module (IPM): integrates drive circuits, protection circuits, and IGBT chips (such as Fuji Electric's 7MBR series), simplifies system design, and is used for household appliance frequency control and industrial servo drive.
Crimp packaging: such as SKiiP technology, which replaces traditional welding with pressure connection, eliminates the risk of thermal fatigue of solder joints, improves reliability, and is suitable for rail transit and high-voltage direct current transmission.
Advanced packaging technology
Double sided heat dissipation package: using DBC (direct bonded copper) substrate and Pin Fi heat sink, the thermal resistance is reduced to below 0.1K/W, meeting the requirements of electric vehicle 800V platform.
Embedded packaging: Embedding IGBT chips into PCB substrates (such as TOLL packaging) to reduce parasitic inductance and increase switching frequency to MHz level, used for 5G base station power supply.
3D integrated packaging: Vertically interconnect chips through silicon via (TSV) technology, parasitic inductance<1nH, supporting GaN based IGBT high-frequency applications (>1GHz).
2、 Technical feature comparison: heat dissipation, parasitic parameters, and reliability
Characteristics: Discrete Packaging, Modular Packaging, Advanced Packaging
The heat dissipation performance depends on the heat sink/air-cooled liquid cooling (Δ Tjc<40 ℃) and double-sided liquid cooling (Δ Tjc<20 ℃)
High parasitic inductance (wire bonding), moderate (copper substrate interconnection), extremely low (3D vertical interconnection)
Low current density (single tube ＜ 100A) High (module ＞ 1000A) Extremely high (3D stacking)
Thermal resistance 1-3K/W (TO-247) 0.2-0.5K/W (62mm module) ＜ 0.1K/W (double-sided heat dissipation)
Integration degree: Single chip, multi chip, parallel connection+heterogeneous integration of driver circuits (driver/sensor/power)
3、 Application scenario adaptation: from consumer electronics to extreme industry
Industrial sector
High power frequency converter: using 62mm module, current>800A, suitable for heavy-duty scenarios such as metallurgy and mining.
Flexible Transmission System (FACTS): Using crimped IGBT, with a withstand voltage greater than 4500V, to ensure grid stability.
Automotive field
Electric vehicle main drive: double-sided heat dissipation module (such as HPD package), current density>300A/cm ², efficiency>98%.
Car charger (OBC): TOLL packaged IGBT, with a 40% reduction in size, supports bidirectional charging and discharging.
Special Scene
Aerospace: Diamond based IGBT module, temperature resistance>500 ℃, radiation dose resistance>100krad.
Deep sea exploration: sealed with glue, pressure resistance>10MPa, anti-corrosion level IP68.
4、 Technology Trends: High Frequency, High Temperature, High Integration
Material upgrade:
SiC based IGBT: Combined with the high critical field strength characteristics of SiC, the packaging withstand voltage is increased to over 10kV, suitable for smart grids.
Nano silver sintering: replaces traditional solder, increases thermal conductivity by 3 times, and extends solder joint life by 10 times.
Structural innovation:
Leadless packaging: reduces parasitic inductance to below 5nH through copper clip bonding, supporting GaN based IGBT high-frequency applications.
Embedded packaging: Integrating IGBT and driver IC on the same substrate (such as Substrate Integrated packaging) reduces parasitic parameters by 60%.
Process integration:
Laser welding: achieve low-temperature connection between chips and substrates (<250 ℃) to avoid thermal damage.
Plasma cleaning: improves bonding interface adhesion, bonding strength>50N, certified by AEC-Q101 automotive standards.
conclusion
The packaging selection of IGBT is an art of balancing power density, heat dissipation efficiency, and system cost. Discrete packaging meets low voltage and low current requirements at low cost; Modular packaging achieves high power output through multi chip integration; Advanced packaging breaks through physical limits with innovative structures and becomes a core component in cutting-edge fields such as new energy vehicles and aerospace. In the future, with the popularization of SiC/GaN materials and the maturity of 3D integration technology, IGBT packaging will develop towards higher frequencies, higher temperatures, and higher integration, promoting the transformation of power electronic systems towards intelligence and efficiency.