JST PH vs Molex PicoBlade: Which 2.0mm vs 1.25mm Connector Should You Specify?
Time:2026-11-09
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JST PH and Molex PicoBlade are the two compact crimp connectors engineers reach for when board space gets tight — and because both show up in consumer electronics, drones and battery packs, the question of which to specify comes up constantly. They are close cousins, but they are not the same connector, and the difference is the pitch.
The headline difference: 2.0mm vs 1.25mm
JST PH is a 2.0mm pitch crimp system, rated around 2 A at 100 V AC/DC, using AWG 30–24 wire. Molex PicoBlade is a 1.25mm pitch system, rated up to 3 A at 250 V, using AWG 32–26 wire. That single number — the pitch — decides everything downstream: board footprint, terminal size and how much current you can carry per circuit.
When to reach for each
Choose PH when you want a slightly larger, easier-to-handle contact and a roomier 2.0mm footprint — it’s the forgiving default for hobby electronics, sensors and small power lines. Choose PicoBlade when space is the overriding constraint and you can work with the smaller 1.25mm footprint — typical of phones, wearables and tightly packed battery boards. Both are friction-lock crimp systems, so neither has a positive latch by default; if your design vibrates, look to the latched variants in each family.
What actually drives the choice
The pitch isn’t a preference — it’s a compatibility constraint. A PH terminal will not seat in a PicoBlade housing and vice versa, and the board footprints don’t match. So the decision usually gets made for you by whichever one is already on the PCB or the battery pack you’re mating to. When you’re designing fresh, pick the largest pitch that still fits the space — larger contacts are easier to crimp reliably and more forgiving in assembly.
We manufacture both families in our Shenzhen factory — PH-style 2.0mm and PicoBlade-style 1.25mm housings, headers and crimp terminals — so whichever pitch your design lands on, you can source the board half and the harness half from one place, factory-direct, without the branded premium or the volume MOQ.
Frequently Asked Questions
What is the difference between JST PH and Molex PicoBlade?
The pitch — PH is 2.0mm rated 2 A, PicoBlade is 1.25mm rated 3 A. They use different terminals and footprints and do not mate.
Are PH and PicoBlade interchangeable?
No. Different pitch and terminal geometry means a PH terminal won’t seat in a PicoBlade housing, and the board footprints differ.
Which should I choose for a compact design?
Pick the largest pitch that still fits the space — PH’s 2.0mm if it fits, PicoBlade’s 1.25mm when space is the overriding constraint.
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