How to find a replacement or cross-reference part

When the exact part can't be found, an equivalent from the same or another brand can get you running again. Here's how to choose one safely.

1. Start with the manufacturer

Most manufacturers publish a successor or migration path for discontinued products. Search the old part number with words like "replacement" or "successor" on the maker's site.

2. Specs that must match

• Voltage, current and power ratings
• Mounting, dimensions and connector or terminal layout
• Communication protocol and firmware (for drives, PLCs and HMIs)
• Sensing range, output type (PNP/NPN) and thread size (for sensors)

3. Specs that can often differ

Color, housing material and small improvements like better efficiency are usually fine. A higher rating is often acceptable, but check with your engineer first.

4. Check before you install

• Compare datasheets side by side.
• Confirm any software or parameter changes the new part needs.
• Keep a record of the swap for future maintenance.

Let Part Finder help

Pro and Business plans suggest possible cross-reference parts next to your search results, and the Datasheet Finder pulls up spec sheets to compare.

Related: How to read a nameplate