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SIMBA 26.03 Release Notes

Welcome to SIMBA 26.03! This is the biggest SIMBA update ever, with a completely reworked user experience, a chart engine rewritten from scratch, embedded Python directly in SIMBA, FMI-based workflows, and major advances for SPICE, JMAG coupling, and AI-assisted productivity.

SIMBA 26.03 Overview

Ultra-fast multi-platform user interface

SIMBA 26.03 introduces a new user interface designed for speed, responsiveness, and modern multi-platform workflows. The application feels faster across everyday tasks, from opening projects to navigating designs, results, scripts, and test benches.

If you are discovering the new interface for the first time, these tutorials are the best place to start:

Tab-based navigation and floating windows

The new interface is built around a tab-based workspace that supports both dockable tabs and floating windows. This makes SIMBA much more comfortable on multi-screen setups, where schematics, charts, scripts, and assistant sessions can stay visible at the same time.

Chart engine rewritten from scratch

SIMBA 26.03 delivers a completely rewritten chart engine for waveform analysis and reporting.

Key capabilities include:

  • Plot-based charts
  • Cursor support
  • Easy comparison of results from different runs
  • CSV import and export
  • DFT support
  • Signal Calculator

Embedded Python directly in SIMBA

Python is now embedded directly in the SIMBA workflow. A SIMBA project can contain Python scripts alongside designs, libraries, thermal data, and test benches, making automation and post-processing part of the same environment.

SIMBA Assistant

SIMBA 26.03 introduces the new SIMBA Assistant.

SIMBA Assistant is an AI built for power electronics engineers, directly integrated inside SIMBA.

It goes beyond simple prompt-and-reply workflows:

  • Explain an issue and let the assistant help fix the design
  • Describe a specification and generate a converter from scratch
  • Ask for a simulation and extract the key waveforms
  • Write and edit Python scripts directly inside the project

All of this happens inside the SIMBA environment, with access to schematics, parameters, solvers, and results.

Note

The SIMBA Assistant requires an additional module.

For privacy-sensitive workflows, SIMBA Assistant can also run with a local private LLM through the embedded MCP server, so your models and data stay on your machine.

FMI co-simulation standard

SIMBA 26.03 adds support for FMI-based workflows with FMU generation directly from SIMBA, making it easier to integrate SIMBA models into broader co-simulation environments.

Improved SPICE simulation

SPICE support continues to improve in SIMBA 26.03, with solver enhancements that increase robustness and compatibility for detailed semiconductor and imported SPICE models.

15% faster simulation performance

SIMBA 26.03 delivers a 15% simulation performance improvement, helping large studies and iterative design work finish faster.

New Demo Mode

SIMBA 26.03 introduces a new Demo Mode to make evaluation easier while clearly defining which capabilities are restricted.

In Demo Mode, some features are not available, including:

  • Saving project files
  • Running Python scripts from the user interface
  • Importing and exporting CSV files
  • Using the aesim.simba Python module

JMAG Direct Coupling subcycling

SIMBA 26.03 extends JMAG Direct Coupling with a new subcycling capability, improving how SIMBA and JMAG interact in coupled electromagnetic simulations.

Thank you for using SIMBA. We hope SIMBA 26.03 helps you build, simulate, automate, and analyze power electronics systems more efficiently than ever.