Binder 770 Documentation
The Binder 770 connector is our standard connector for tether connections above the water. The connectors have 8 pins and are IP67 splashproof when mated, easy to use, and compact. The Binder 770 plug is pre-installed on all Fathom tethers since August 2018, but the standalone connector can be used to retrofit older tethers.
For more information please see the manufacturer data sheets:
|Length (2.5-4 mm)||58 mm||2.28 in|
|Length (6-8 mm)||59 mm||2.32 in|
|Diameter||19.9 mm||0.78 in|
|Current per pin||2 A|
|Maximum Wire gauge||0.25 mm2||24 AWG|
Binder 770 Plug 2.5-4 mm
Binder 770 Plug 6-8 mm
3D models are provided in as STEP files:
|Binder 770 Plug 2.5-4 mm||MISC-ELEC-BINDER-770-PLUG-S-R1.STP|
|Binder 770 Plug 6-8 mm||MISC-ELEC-BINDER-770-PLUG-L-R1.STP|
The Binder 770 connector comes with all the parts necessary to solder and secure it to the end of a section of Fathom or Fathom Slim tether. Soldering is of moderate difficulty with small closely spaced contacts.
When working with electricity, especially in water, always practice caution. Always ensure that connections are secure and watertight.
Take care when soldering and use caution to avoid injury.
Required Tools (Not Included)
- Soldering iron with a small tip
- Small vise or clamp
- Flux (optional)
Step 1: Preparing the Tether
For both the Fathom and Fathom Slimtethers, strip off 14-20 mm (0.55-0.79 in) of cable jacket, and strip all individual conductions about 2 mm (0.08 in). You can refer to the Tether Stripping Instructions for more details.
Step 2: Tinning the Wire
Using a small amount of solder, tin each tether wire.
Step 3: Tinning the Connector Contacts
Using a small amount of solder, tin each Binder connector contact. Only pins one and two need to be tinned if using two wire Fathom Slim tether.
Step 4: Sliding on the Connector Parts
Slide the end piece, white plastic ring, rubber grip, and connector body over onto the tether as shown. Note orientation of the body, the external thread should face away from the bare wire end of the tether.
Step 5: Soldering the Wire to the Contacts
Solder the tether wires to each contact of the Binder connector in the order indicated in the above diagram. With everything tinned, it should only take a light touch and maybe a drop of additional solder to establish a secure connector. Avoid heat for more than a few seconds per wire to avoid melting the plastic around each contact.
Take care not to create a solder bridge between the wires, and test the integrity of each connection by gently pulling on the wire.
Only two wires need to be soldered for Fathom Slim tether.
Step 6: Attaching the Connector Body
Slide the connector body up to the contacts, and screw together tightly, taking care not to twist the wires.
Step 7: Completing the Connector
Slide the remaining grip and end pieces up to the connector body, and screw together tightly, taking care not to twist the wires.
Once complete, it is recommended to use a multimeter to test the continuity of each connection to confirm all solder joints are intact, in the correct order, and with no bridging.