Supplier Resources

Partnering with suppliers to combine our capabilities and expertise allows us to provide best-in-class products and services to our customers worldwide. Our suppliers are integrated into our customers’ design and development processes to ensure we meet their quality, cost, and availability requirements.

So we can continue delivering high-quality, cost-effective solutions to our customers, we expect our suppliers to commit to measuring Key Performance Indicators and implementing continuous improvement practices. The Littelfuse Supplier Quality Manual is designed to support suppliers in this commitment by:

  • Clearly communicating our expectations for both suppliers and Littelfuse
  • Providing resources to assist you in fulfilling your responsibilities
  • Describing measurements used to evaluate your performance and drive continuous improvement
  • Supplier Quality Manual
  • Supplier Code of Conduct
  • Procurement and Sourcing Documents

This manual describes the specific requirements and expectations for doing business with Littelfuse. The appendices listed in the manual appear below.

Supplier Quality Manual

English | Chinese

Manual Appendices By Type

Suppliers should familiarize themselves with and abide by the Littelfuse Supplier Code of Conduct that appears below.

Supplier Code of Conduct

English | Chinese | Japanese | French | Spanish | German

Purchasing-related documents are available below. To request Littelfuse credit references, email

Littelfuse Supplier Notification of Process & Product Changes Form

Complete this form ONLY to notify our supplier development team of process and product changes. An Excel download version is also available.

For all other needs, please visit our Contact Us page.