# What is this 15x5mm two pin connector?

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#### billdz

##### Well-Known Member
I picked up a second-hand av-bay with some wires that connect to the top of the bulkheads for ejection charges. Each wire has a 15x5mm two-pin female connector. It does not appear to be a standard JST connector. Anyone recognize it?
Thanks,
Bill

#### timbucktoo

##### Well-Known Member
Staff member
Global Mod
Wire connectors sold by Doghouse rocketry (Binder Design)

#### billdz

##### Well-Known Member
Wire connectors sold by Doghouse rocketry (Binder Design)
Thanks, Tim. I do believe you are correct. These do not seem to be very common, I googled "2 pin connection" and looked at various ones for over an hour, without finding a match. Bummer that they only sell these in pairs, as my av-bay already has the females (6 of them, 4 ejection charges and 2 power switches).

#### Reinhard

##### Well-Known Member
Those are Molex-SL connectors:

You can get them from Digikey or Mouser. Usually, you need to crimp them yourself, but pre-wired leads are available with the female crimp terminals.
For small amounts, it's probably easier to buy the pre-wired ones from Doghouse rocketry, but if you build wiring harnesses on a regular basis, crimping them yourself allows you to customize them to your requirements.

Reinhard

#### billdz

##### Well-Known Member
Those are Molex-SL connectors:

You can get them from Digikey or Mouser. Usually, you need to crimp them yourself, but pre-wired leads are available with the female crimp terminals.
For small amounts, it's probably easier to buy the pre-wired ones from Doghouse rocketry, but if you build wiring harnesses on a regular basis, crimping them yourself allows you to customize them to your requirements.

Reinhard
Thanks for the reply. Since these connectors cost $4 a pair from Doghouse and I need 6 of them, I'm thinking about just removing them and replacing them with something from eBay, where similar connectors sell for less than$10 for 10 pairs.

#### OverTheTop

##### Well-Known Member
Molex is a reputable brand and those are good positive-locking housings.

#### Reinhard

##### Well-Known Member
Thanks for the reply. Since these connectors cost $4 a pair from Doghouse and I need 6 of them, I'm thinking about just removing them and replacing them with something from eBay, where similar connectors sell for less than$10 for 10 pairs.
If you want to replace them with something pre-wired from eBay, avoid the JST XH, JST PH and JST RCY. They all are non-locking. The first two are strictly wire to board series, so the male part is a PCB header soldered to wires. This can lead to stress concentrations that in turn can cause the wire to break. Because the stress point is typically hidden under black shrink tubing, you can't even inspect that easily. The JST RCY are only available in 2pin, and their keying against reverse polarity is too flimsy as I had to learn.

The JST SM look better. They are proper wire-to-wire connectors, locking and available in multiple pin counts. They are an unofficial standard in LED strips, and therefore cheaply available. You can't use them in wire-to-board applications like the Molex SL, but I assume that's not what you had in mind anyways.

Reinhard

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#### billdz

##### Well-Known Member
The JST RCY are only available in 2pin, and their keying against reverse polarity is too flimsy as I had to learn.

The JST SM look better. They are proper wire-to-wire connectors, locking and available in multiple pin counts. They are an unofficial standard in LED strips, and therefore cheaply available. You can't use them in wire-to-board applications like the Molex SL, but I assume that's not what you had in mind anyways.
There ought to be a law against connectors that can be put together with reverse polarity.

The SM does look more secure.

#### OverTheTop

##### Well-Known Member
If you have connectors without positive locking you can secure them for flight with a drop of hot-melt glue. It can be easily removed after flight if it was carefully applied.

The same hotmelt can also be used for pinning down wires that have been soldered onto connectors, preventing them from straining the solder joint.