Your buyers filter by specification exactly the way a design engineer does, and they call it a product finder. Voltage, enclosure rating, mounting, port size, duty cycle. The category tree runs out long before the specification does.
Most industrial catalogs are organised the way the company is organised: by product line, then by series, then by a list of part numbers. That works for someone who already knows what they want. It fails the maintenance engineer who knows the port size, the pressure rating and the material, and needs to find every part that matches.
The second pattern is email-gated pricing. It is understandable and it is expensive: the buyer who will not fill in a form to learn a price does not call you instead. They buy from the distributor who published one.
Buyers can browse a tree but cannot narrow by the parameters that actually decide the part.
Gating the number teaches buyers to source elsewhere and tells you nothing useful about intent.
A guided selection tool trapped in a document that cannot be filtered, found by search engines or updated.
Nothing about the underlying capability changes between an electronics catalog and an industrial one. What changes is the language on the page and which attributes lead.
Filter by the specifications that decide the part, whether the buyer browses, uses site search or arrives from a search engine.
Step a buyer through the decisions in the order an application engineer would ask them, ending in a shortlist rather than a PDF.
Where the part number encodes options, buyers select the options and the system produces the number.
Competitor or legacy part to your equivalent, with the differences shown.
Stock and lead time where the decision is made, including your own branches.
Multi-line requests with quantities and application notes attached, into your CRM.
Engineers select by attributes, not by category tree.
Where an engineer's parts list becomes a sales opportunity.
Live distributor pricing and availability, on the page.
Present, Partial or Missing, each rating followed by the specific observation behind it. Five business days, and there is no call first.