Stellantis EV Platforms

This article summarizes Stellantis' major EV platforms and why they matter. A platform is not just a chassis. It is a layered system that shapes real-world behavior: charging curve stability, sustained performance, thermal limits, software longevity, and autonomy headroom.

Stellantis operates many brands (Jeep, Ram, Dodge, Chrysler, Fiat, Peugeot, Citroën, Opel/Vauxhall, Alfa Romeo, Maserati, DS Automobiles, Lancia). Platform sharing is expected by design: STLA platforms define the underlying "skate", while brand execution differentiates styling, tuning, software features, interior design, and option strategy.

What a Stellantis platform controls

Stellantis platforms are best understood as a stack: a vehicle “skate” platform family plus a software-defined vehicle (SDV) layer that spans multiple brands.

• Structural and energy layer: pack layout, crash structure, suspension hard points, multi-body packaging
• Powertrain and charging layer: voltage class (400 V vs 800 V-class), fast-charge headroom, drive unit integration
• EEA (electrical/electronic architecture): controller consolidation, in-vehicle networking, OTA scope
• Software platform layer: Stellantis' SDV layers (STLA Brain, STLA SmartCockpit, STLA AutoDrive) intended to unify software across brands

Stellantis platform roadmap

Stellantis' EV platform roadmap can be summarized as:

• Legacy / current: e-CMP and other regional architectures used across compact programs
• STLA families (next-gen): STLA Small, Medium, Large, Frame as the core BEV platform set
• SDV overlay: STLA Brain / SmartCockpit / AutoDrive as cross-brand software architecture layers

Stellantis EV platform lineup

Platform / Architecture	Primary Use	Voltage / Charging	Architecture Direction	Representative Examples
STLA Small	Smaller passenger EVs (compact segments)	400 V-class (program dependent)	Next-gen small-vehicle BEV platform family for multiple Stellantis brands	Future compact BEVs across EU-focused brands
STLA Medium	Mainstream passenger EVs (C/D segments)	400 V-class (program dependent)	Modular BEV platform for high-volume cross-brand use	Future Peugeot/Opel/Jeep/Fiat-class programs
STLA Large	Larger passenger EVs (performance + premium capable)	400 V and 800 V-class capability is referenced in Stellantis messaging (program dependent)	Supports higher-performance and longer-range programs; intended for North America and global premium products	Dodge/Jeep/Chrysler/Alfa Romeo-class next-gen EVs
STLA Frame	Body-on-frame trucks and large SUVs	400 V and 800 V-class capability is referenced (program dependent)	Truck/SUV platform family optimized for towing, payload, and durability	Ram/Jeep large SUV and truck BEV programs
e-CMP (legacy)	Compact cross-brand programs (legacy EV architecture)	400 V-class (typical for segment)	Earlier multi-energy architecture used across multiple European brands	Prior generation compact EVs across Peugeot/Opel/Citroën/Fiat lines
STLA Brain / SmartCockpit / AutoDrive	Cross-brand SDV software stack	Enables broader OTA capability (not a voltage spec)	Unifies software and compute architecture across platforms and brands	Roadmap layer intended to span STLA Small/Medium/Large/Frame

STLA Small / Medium

STLA Small and STLA Medium are the volume platforms intended to replace a patchwork of regional legacy architectures. Their main value is industrial: shared modules, faster cadence, and more consistent electrical architecture behavior across brands.

What these tend to enable:

• Faster cross-brand rollout of EV programs using shared modules
• More consistent charging and thermal behavior generation-to-generation
• Clearer SDV upgrade path because the EEA and software layers can standardize

See the STLA Small and STLA Medium platform pages.

STLA Large

STLA Large targets higher performance and longer-range programs and is positioned as a global platform for premium and performance-oriented products. Public Stellantis messaging references both 400 V and 800 V-class capability across STLA platforms, with the exact implementation varying by model program.

What STLA Large tends to focus on:

• Higher power and thermal headroom for sustained performance
• Potential for higher-voltage charging configurations on select programs
• Platform commonality across multiple North America and global brands

See the STLA Large platform page.

STLA Frame

STLA Frame is the truck-and-large-SUV platform family designed for towing, payload, and durability. It matters because those use cases stress thermal systems, high-power draw, and charging behavior more than typical passenger duty cycles.

What STLA Frame tends to enable:

• Chassis and suspension hardpoints optimized for heavy loads
• Battery sizing and cooling strategies aligned to towing and high-duty cycles
• Architecture consistency across truck/SUV programs for fleets

See the STLA Frame platform page.

STLA Brain / SmartCockpit / AutoDrive (SDV layer)

Stellantis presents STLA Brain (core compute/EEA layer), STLA SmartCockpit (cabin UX), and STLA AutoDrive (ADAS/automation features) as a cross-brand SDV stack. This matters because it can decouple software capability from any single vehicle platform and allow consistent OTA behavior across brands and segments.

See the Stellantis SDV stack.

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