Synopsys PrimeSim Custom Fault is a transistor-level analog and mixed-signal fault simulation tool that generates detection and diagnostic coverage metrics for functional safety (FMEDA/diagnostic coverage) and assesses manufacturing test coverage at block, subsystem, and full-chip scale, with sampling and distributed-simulation features to reduce the number of required fault simulations.
Published May 16, 2026
Most likely ICP based on tool class and safety compliance needs:
Synopsys emphasizes mission-critical needs and low defect-per-part (DPPB/DPPM) objectives in their marketing materials.
Get a comprehensive analysis of Synopsys PrimeSim Custom Fault including market position, competitive landscape, adoption trends, and peer benchmarks.
Download full report →Synopsys public pages sometimes include “What’s New” information at the suite level (PrimeSim/PrimeWave/PrimeSim Reliability Analysis), but Custom Fault–specific roadmap items and dates are not clearly published.
Suite context:
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For specialized, high-cost EDA products, mainstream review platforms (for example, G2, TrustRadius, Capterra, Gartner Peer Insights) often have limited or no public reviews for product-specific pages; access to some content may be gated.
This is a notable limitation: most accessible feedback consists of vendor case studies or quotes and community discussions about Synopsys tools in general rather than product-specific independent reviews.
Synopsys press releases and blogs include customer comments about the broader PrimeSim Reliability Analysis solution, including analog fault simulation for FMEDA and ISO 26262 workflows. These vendor-published perspectives are not independent third-party validations and should be interpreted accordingly.
Example paraphrase of a vendor-cited customer statement (TDK-Micronas): the analog fault simulation technology was described as providing customizable fault models and an open fault database, enabling calculation of IP-level FMEDA metrics and supporting ISO 26262 compliance.
Critical note: These are vendor-selected statements that do not include independent methodology or comparative benchmarks.
Public commentary for this specialized product tends to focus on Synopsys tool usage, licensing, documentation access, and workflow integration rather than on detailed outcomes from PrimeSim Custom Fault itself.
Examples of recurring themes in community discussions:
Based on Synopsys positioning and community context, factors that may drive selection include:
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Because independent reviews are scarce, reasons for churn are inferred from common EDA buying dynamics and community commentary:
Community context on cost expectations:
Synopsys materials indicate several semiconductor companies adopted PrimeSim Reliability Analysis, citing Dialog Semiconductor, TDK-Micronas, STMicroelectronics, and AMD in vendor materials.
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Critical evaluation:
A Synopsys success story reported performance improvements (for example, a substantial speed-up in characterization and a reported accuracy improvement) for a PrimeSim/PrimeLib cloud workflow. This pertains to the broader PrimeSim ecosystem rather than the Custom Fault product specifically.
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Critical evaluation:
Source (integration to VC FSM described):
Synopsys PrimeSim Custom Fault is a transistor-level analog and mixed-signal fault simulation product designed to enable functional safety analysis (for example, FMEDA/diagnostic coverage) and to assess manufacturing test coverage at block, subsystem, and full-chip scale. Synopsys presents it as part of a unified reliability workflow (PrimeSim Reliability Analysis) and documents performance features (for example, adaptive sampling) intended to reduce the number of required fault simulations while producing coverage metrics and diagnostics.
Key vendor-described use cases include:
(Primary product page and datasheet.)
Target users: analog/mixed-signal verification engineers, DFT/test engineers focused on analog test coverage, and functional safety engineers supporting ISO 26262 deliverables.
Target industries: Automotive (ISO 26262, ASIL-D) is the most explicit vertical; the reliability narrative also applies to aerospace/defense, medical, and other mission-critical segments.
Synopsys describes PrimeSim Custom Fault with vendor claims positioning it as a leading analog fault simulation offering and as an integrated element of the PrimeSim Reliability Analysis / Custom Design Platform toolchain, with integration points to other Synopsys simulators and to VCS for mixed-signal fault simulation.