Summary
Trying to identify a connector or main device from an accessory like a TPA, seal, latch, contact, or other smaller part usually doesn’t work. Start with the main part instead.
Introduction
We often see customers try to trace a connector backwards using a small accessory piece from a larger assembly. This does occasionally work, but most of the time you won’t be able to determine the original housing from an accessory alone. There are several reasons for this, depending on the type of part and how the manufacturer documents compatibility.
Example: Molex Micro-Fit+ Versa TPA
Associated Component: WM26567-ND (Molex 2064620200) – Connector, TPA
This TPA is listed as compatible with 900-2157591002-ND(Molex 2157591002) in the datasheet. However, the datasheet for the TPA does not list 206462 as a compatible part. At first glance, this looks contradictory; this is not exactly the case. Page 3 of the TPA datasheet instead references: Micro-Fit+ Dual Row Receptacle Housings: 206461. In our catalog we list three connectors matching the partial number.
The key detail here is that 206462 is part of the same Micro-Fit+ Versa series as the 206461 housings. The TPA will fit them even if the datasheet doesn’t explicitly list every single compatible housing variant.
Why Not List All Parts?
It might seem ideal if datasheets provided a way to reverse-lookup all compatible parts. However, this becomes impractical quickly. For many connector families there may be the following:
- Dozens of cavity counts
- Multiple keying options
- Color variants
- Mechanical revisions
Documenting every relationship creates enormous tables that quickly fall out of date. Associated product like contacts, retainers, seals, and TPAs are usually designed for entire series. There can be instances of specific part numbers for connectors, but compatibility often runs broader than the datasheet suggests.
Consistency of the Design Process
Regardless of how the manufacturer designs their product in terms of order of creation, documentation flows forward from the housing to the accessory, not backwards. Some manufacturers do maintain reverse references, but this is far from universal.