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Choosing a wire-to-board connector feels like a guessing game until you know the five numbers that actually matter. Here's the checklist I use. ## 1. Pitch The gap between contacts. 2.54mm, 2.0mm and 3.96mm are the common ones. Bigger pitch = more current and easier assembly; smaller pitch = more density. ## 2. Current How many amps does each circuit carry? A 2.0mm connector is fine for a sensor, useless for a 10A power line. Match the rating to the load, with a bit of headroom. ## 3. Wire gauge The connector's terminal only accepts a range of wire sizes — say 28–22 AWG. Your harness wire has to land inside that range or the crimp will be bad. ## 4. Locking Does it need to survive vibration? A friction lock is fine on a desk; a positive lock or locking ramp is what you want in a car or a machine. ## 5. Mating cycles How many times will it be plugged and unplugged? Test points need to survive thousands of cycles; a one-time internal connection barely matters. ## And the honest last step When in doubt, match what's already on the board or the battery. Swapping connector families means re-tooling crimps and housings, and that's where projects lose a week. We supply the common JST-compatible and Molex-compatible series — XH, PH, VH and more — with pre-crimped wire assemblies if you want to skip the crimping tool entirely. ## Related reading

• JST XH vs PH vs VH: Which Connector Series Do You Need?
• Battery Connector 2.0mm vs 2.5mm Pitch: Which Do You Need?