Knowledge Center ➜ Entities

PDF Solutions

Developer of solutions for accelerating yield ramp in fabs.


PDF Solutions develops yield-improvement technologies and services for the manufacturing process lifecycle.

The company’s focus is accelerating fab yield ramp, electrical characterization for production control, and big data analytics software for fabless, foundry, test and assembly production control and monitoring.

Electrical characterization is becoming increasingly important because traditional optical inspection cannot see defects that are buried in finFETs and other 3D structures. Moreover, at 16/14nm and beyond, overlay alignment accuracy is moving beyond the resolution of optical systems, which makes it difficult to maintain high yield.

PDF Solutions debuted on NASDAQ (PDFS) on July 27, 2001 with an IPO of 4.5 million shares at $12 per share.


  • HQ: Santa Clara, CA, USA
  • Founded: 1991
  • Founders: John K. Kibarian, Kimon Michaels
  • Website:


May 2019: Acquired certain assets, including all related IP, from StreamMosaic, a provider of AI and machine learning predictive analytics and yield solutions for semiconductor manufacturing. [Press Release]

July 2015: Acquired Syntricity, a cloud-based SaaS provider of characterization and yield management solutions. [Press Release]

October 2008: Acquired substantially all of the assets, including certain customer contracts, of Triant Holdings Fault Detection & Classification business for $1.75 million in cash. [Press Release]

May 2007: Acquired Fabbrix, Inc., a provider of silicon IP designed to create highly manufacturable and area efficient designs targeted for advanced technology nodes, for $5.6 million total comprised of $2.7 million in cash and 271,531 shares of PDF Solutions’ common stock. The two companies previously collaborated on optimizing IP manufacturability. [Press Release]

October 2006: Acquired Si Automation SA, a provider of Fault Detection and Classification software and services for approximately $35.6 million, comprised of $26.6 million in cash and 699,298 shares of PDF Solutions common stock. [Press Release]

September 2003: Acquired IDS Software Systems, a provider of a yield management system incorporating data management, comprehensive analysis, and reporting capabilities, for a total of $41.6 million comprised of $23 million in cash and 2,000,000 shares of PDF’s common stock. [Press Release]

July 2001: NASDAQ (PDFS) IPO of 4.5 million shares at $12 per share. [Press Release]

June 2000: Acquired AISS, GmbH, a provider of software to model and compensate for the physical effects involved in IC mask making and lithography. [Press Release]

  • Type: Company


Using ML In Manufacturing


Using Machine Learning To Break Down Silos


Variation At 10/7nm