Best-in-class Cell-level
Soft Error Detector

EDA tool for Soft Error Analysis at cell-level


TFIT® (Transistor Failure In Time) is a best-in-class transistor/cell level soft error simulator. Thanks to its unique approach and close collaboration with foundries, TFIT enables high-speed, accurate simulation of the radiation effects of standard cells and custom designs implemented in main process nodes available on the market.

The TFIT methodology is based on foundry provided characterization models of ionizing particles for each technology node. TFIT innovative algorithms lean on these foundry models to simulate radiation effects accurately at the spice level up to 100X faster than TCAD based solutions.

TFIT makes it easy to: 

Supported radiation environments

The TFIT models offer the basics for handling soft error rate calculations for the following environments:

Supported process nodes

IROC is partnering with major foundries and offers many foundry approved TFIT models from main stream process nodes are available.


Available TFIT Models


65, 40g, 28xx, 16FF, N10, N7, N5, N3


32nm, 28nm, 14nm, 10nm, 7nm


40xx, 40xx, 22FDX


65nm, 28FDX

Inputs and outputs

In addition to the target technology, TFIT requires the Spice netlist and the GDS files of the analyzed design. TFIT detects the various logical states of the input design and performs the requested analysis on each of these states.

TFIT - best-in-class cell level soft error detector

In addition to a log file containing Soft Error Rate (SER) details, TFIT outputs the sensitivity maps showing sensitive zones of the design as a function of Linear Energy Transfer. This can be helpful for understanding and optimizing sensitivity.


TFIT offers rich features covering a wide variety of applications requiring good or high levels of reliability. This is detailed in the table on the right:


Ground application

Space application

Specific application

Supported spice simulator

Access to a standard spice simulator supporting simulation technology is mandatory to use TFIT. The following commercial simulators are supported:

Other Spice simulators could be supported upon request.

Performance benchmark

Simulation type


Single particle impact

Few seconds

Cross Section

Few minutes

LET threshold

< 1 minute

SEU Neutron FIT

~ 5 minutes

Alpha FIT


~ 5 minutes

~ 30 minutes

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TFIT - best-in-class cell level soft error detector

TFIT - best-in-class cell level soft error detector - IROC

TFIT - best-in-class cell level Soft Error detector, TFIT - best-in-class transistor level Soft Error detector - IROC TECHNOLOGIES