Board footprint and wire-to-board fit
The 640389-8: This is an 8-position, single-row header on 3.96mm pitch — the spacing between adjacent pins sets the PCB footprint and the mating receptacle's wire pitch.

TE Connectivity AMP Connectors MTA-156 header, 8 positions, 3.96mm pitch, right-angle through-hole, shrouded 1-wall, friction lock, tin-plated male pins, UL94 V-0 natural housing.
| Parameter | Value |
|---|---|
| Series | MTA-156 |
| Type | Male Pin |
| Mounting | Through Hole, Right Angle |
| Connector type | Header |
| Fastening type | Friction Lock |
| Voltage rating | 600VAC |
| Current rating | Varies by Wire Gauge |
| Operating temperature | -55°C ~ 105°C |
| Contact material | Copper Alloy |
| Insulation color | Natural |
| Insulation height | 0.300\" (7.62mm) |
| Insulation material | Thermoplastic, Glass Filled |
| Parameter | Value |
|---|---|
| Material flammability rating | UL94 V-0 |
| Style | Board to Cable/Wire |
| Package | Bulk |
| Shrouding | Shrouded - 1 Wall |
| Termination | Solder |
| Applications | General Purpose, Industrial |
| Contact shape | Square |
| Rows | 1 |
| Pitch | 0.156\" (3.96mm) |
| Positions | 8 |
| Contact finish - post | Tin |
| Contact length - post | 0.125\" (3.18mm) |
| Contact finish - mating | Tin |
| Contact length - mating | 0.400\" (10.16mm) |
The 640389-8: This is an 8-position, single-row header on 3.96mm pitch — the spacing between adjacent pins sets the PCB footprint and the mating receptacle's wire pitch.
The pinout is a single row of 8 male pins on 3.96mm pitch. All positions are loaded. The mating contact length is 0.400 inches (10.16mm); the post length for soldering is 0.125 inches (3.18mm).