From time to time, we got inquiry that the connectors come with peripheral devices we are selling for the APM or Pixhawk may not exactly the same type they may expect (i.e. ready to plug directly) for their flight controller (no matter it is from us or not) therefore caused some confusions.
There are two common specifications for the connectors of those open-source based flight controller: DF13 and JST (sometimes also called Molex as the JST is originated from Molex). Please be reminded that JST connector itself also comes in several different types. Here is a good article shared by jj604 (John) in the RC Group regarding the JST connector.
The Molex PicoBlade
connector mentioned in the article may have different naming such as “Micro JST”, or “JST 1.25FJ”… etc. somewhere else. We will call it “JST-1.25” in this article.
(Picture Resource: http://www.rcgroups.com/forums/showthread.php?t=1493712
APM and Pixhawk are the most common two flight controllers on market, and they are both based on open source, maintained by 3DRobotics(http://3drobotics.com/
). DF13 is mainly used for APM/Pixhawk and accessories made by 3DR (and a few vendors). Just most products from Asian manufacturers prefer using JST-1.25 connectors for cost reduction. The pin spacing (pitch) of DF13 and JST-1.25 are actually the same 1.25. Thus it is still possible to use them together (i.e. plug JST-1.25 to DF13 and vice versa).
However, the two connectors do not have exactly the same shape and may not fit perfectly. The positioning of the pin array is slightly offset and the plastic latch and notch of DF13 is different from JST-1.25.
Furthermore, the plastic latch of DF13 is slightly thicker than JST-1.25. It needs to be cut in order to fit JST-1.25 socket.
The plastic latch of JST-1.25 plug is longer but thinner. It will fit DF13 socket without modification.
The easier way to distinguish between them is through the color. Normally, DF13 is grey, and JST1.25 is white. However, please read through the product description before placing your order.
We will always assume people who purchase these products are capable of handling this kind of open source project, and it is not uncommon that DIY skill and work are required. We don't recommend those products based on open source if you don't have confidence to use them. Hope your understanding.