Infineon CoolMOS CFD7A: automotive MOSFET platform for 800 V powertrains

Infineon’s CoolMOS CFD7A automotive-qualified superjunction MOSFET family targets 400 V and 800 V electric powertrains, combining low switching losses with robust short-circuit capability for on-board chargers and DC-DC converters.

Responsible: ad hoc news Classics & Long-sellers Desk. Reviewed prior to publication on June 14, 2026 at 5:30 PM ET. Details in the imprint.

Infineon Technologies AG’s CoolMOS CFD7A family is an automotive-qualified high-voltage MOSFET platform designed specifically for 400 V and 800 V electric powertrains. The superjunction devices combine low switching losses with a fast intrinsic diode and short-circuit robustness, making them a fit for on-board chargers (OBC), DC-DC converters, and auxiliary inverters in modern electric vehicles. For US customers, the parts are available through major distributors, typically in the TO-247 and D2PAK packages with voltage classes up to 650 V and 750 V. With the transition to higher-voltage EV architectures accelerating, the CFD7A line underpins many Tier 1 designs without being visible to end consumers.

What the CoolMOS CFD7A family is designed to do

CoolMOS CFD7A is part of Infineon’s long-running CoolMOS superjunction MOSFET portfolio, but tuned and qualified for automotive applications according to AEC-Q101. The "CFD" in the name refers to the fast body diode concept, which reduces reverse recovery losses and improves efficiency in hard-switching topologies such as totem-pole PFC or full-bridge converters. The "7" denotes the seventh generation in Infineon’s superjunction lineage, bringing lower on-resistance and better figure-of-merit compared to earlier families. By combining a low R_DS(on) with controlled switching behavior, the CFD7A parts help designers achieve higher power density without compromising electromagnetic interference targets.

Within the automotive powertrain, Infineon positions CFD7A mainly for traction-related power conversion functions: OBC systems up to around 22 kW, high-voltage DC-DC converters that supply the 12 V or 48 V board net from a 400 V or 800 V battery, and auxiliary inverters for HVAC compressors or pumps. The portfolio offers devices in the 120 m? down into the single-digit milliohm range, depending on package and voltage rating, so designers can pick parts that balance conduction losses, switching losses, and cost. Infineon states that the family supports both soft-switching and hard-switching topologies, giving OEMs flexibility in platform reuse across segments.

The superjunction structure at the heart of CoolMOS allows a much steeper trade-off between breakdown voltage and on-resistance than conventional planar MOSFETs. As a result, a 650 V CFD7A device can achieve low specific on-resistance while still withstanding the transients typical in automotive environments. Infineon’s datasheets highlight improved body-diode ruggedness and controlled dV/dt performance, which is crucial when these parts sit close to sensitive control electronics or are connected through long cable harnesses in the vehicle. For vehicle manufacturers pushing toward lighter, more compact power electronics, these traits directly translate into smaller magnetics, reduced cooling requirements, or both.

Infineon has also focused on short-circuit capability for the CFD7A family, recognizing that automotive traction power stages must tolerate fault scenarios until protective circuits react. The devices are specified for short-circuit withstand times in the microsecond range, depending on part and operating conditions, and are designed to cooperate with fast gate drivers and current-sense elements in the system. In practice, this robustness can make it easier for Tier 1 suppliers to satisfy OEM safety requirements without resorting to more expensive topologies or redundant modules. The devices’ avalanche energy ratings likewise support reliable operation in environments where load-dump and inductive kickback cannot be fully eliminated.

From a system perspective, the CFD7A MOSFETs are often used together with Infineon’s gate-driver ICs and microcontrollers in reference designs and evaluation boards. Infineon publishes application notes that show CFD7A-based 11 kW or 22 kW OBC solutions and multi-kilowatt DC-DC converters, allowing engineers to benchmark efficiency and thermal performance. In many such reference designs, peak efficiencies above 96 percent are achievable in typical OBC conditions when combining CFD7A with digital control and resonant topologies. For designers under time-to-market pressure, starting from these reference designs can substantially shorten development cycles.

For the US market, CFD7A devices are generally stocked through distribution partners such as Digi-Key, Mouser, and Arrow, which list multiple part numbers across the 650 V and 750 V classes. Pricing varies widely by order volume and package but, at distribution level, single-unit prices for mid-range R_DS(on) variants are often in the single-digit US dollar range. Higher-current parts with very low on-resistance carry higher per-unit prices but can still lower overall system cost when they enable smaller heatsinks or fewer parallel devices. Because these are B2B components, Infineon does not publish a single MSRP in the same way a consumer product would; instead, contract pricing with automotive Tier 1s reflects long-term volumes and platform commitments.

Within Infineon’s broader power semiconductor lineup, CoolMOS CFD7A sits alongside silicon-carbide (SiC) MOSFETs and IGBTs, giving automotive customers a menu of technologies tailored to different voltage, power, and cost points. While SiC is gaining share in high-end 800 V traction inverters, silicon superjunction MOSFETs like CFD7A remain competitive for OBC and DC-DC designs where switching frequencies and efficiency targets can be met without SiC’s higher device cost. Many vehicle platforms therefore pair SiC traction inverters with CoolMOS-based auxiliary converters, using a mixed-technology strategy. For Infineon, this hybrid positioning helps maintain relevance across a wide range of EV segments from mass-market models to premium vehicles.

Given the long design cycles in the automotive sector, families such as CoolMOS CFD7A are typically designed for years of availability and stable performance characteristics. This longevity is an important part of why the platform can be viewed as a "classic" in Infineon’s power portfolio, even as specific part numbers evolve. Once an OEM and Tier 1 lock in a powertrain architecture, the underlying MOSFET technology often remains in place for a full model generation, with only incremental updates. As a result, CFD7A volumes can persist for many years after the initial design wins, supporting Infineon’s power semiconductor revenues.

For context, power semiconductors, including MOSFETs and IGBTs, represent a significant share of Infineon’s Automotive segment revenue, which the company has highlighted as a growth driver in its recent earnings presentations. Although Infineon does not break out revenue by individual product family, management has repeatedly emphasized demand from electric vehicle powertrain and charging applications as a key trend. Taken together, the CoolMOS CFD7A line and related automotive power devices play a central role in that narrative, as they are embedded deep inside EV platforms shipped by multiple carmakers worldwide. Shares of Infineon Technologies AG (DE0006231004, ticker IFNNY) traded at $92.30 on OTC markets on June 12, 2026, according to MarketBeat.

CoolMOS CFD7A at a glance

• Product: CoolMOS CFD7A automotive MOSFET family
• Manufacturer: Infineon Technologies AG
• Category: Classic long-seller power MOSFET platform
• Launch date: Initially introduced in the late 2010s for automotive applications (family, ongoing extensions)
• MSRP / Price: Typically single-digit US dollars per unit at distribution level, depending on voltage, RDS(on), and package (as of June 2026)
• Availability: Supplied to automotive OEMs and Tier 1s; available in the US via major electronic distributors and Infineon-authorized channels
• Target audience: Automotive power electronics engineers designing OBCs, DC-DC converters, and auxiliary inverters for 400 V and 800 V EV powertrains
• Key feature / USP: Automotive-qualified superjunction MOSFET with fast body diode and low switching losses, optimized for high-efficiency EV power conversion

This article was created with a.i. assistance and editorially reviewed. Product information is provided without warranty; prices and availability may change at any time. Not investment advice, not a buy or sell recommendation. Trading in securities carries risks up to the total loss of capital.