XT90 Pinout
High-current 4.5 mm bullet RC connector rated ~90 A continuous.
Overview
The XT90 is the large member of the AMASS XT family, using two 4.5 mm gold-plated bullet contacts in a robust nylon housing for high-current packs.
A two-pole DC connector - one positive and one negative bullet, keyed by the housing. The XT90-S anti-spark variant adds a resistor to limit inrush current.
Pinout
| Pin | Name | Function | Description |
|---|---|---|---|
| + | Positive | SIGNAL | Positive 4.5 mm bullet contact (housing marked +) |
| - | Negative | SIGNAL | Negative 4.5 mm bullet contact (housing marked -) |
Notes
- Polarized housing - match the molded + and - marks.
- XT90-S (anti-spark) has a resistor-loaded contact to reduce arcing; mates with standard XT90.
Reference: AMASS XT90 connector datasheet· verified 2026-06-27