Supported Models
- AP Watch S1-S10, SE and Ultra — up to 2.5W dynamic-decoding charging
- SAM Galaxy Watch 1-7 and Ultra — up to 1.5W charging
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Wireless Charging Solution Products
JX183 AP + SAM Dual-Watch Charging Solution
Model: JX183 / 9903B1-B2 Authentication Chip
A dual-protocol watch charging reference design supporting 2.5W AP watches and 1.5W SAM watches, with flexible single-coil or dual-coil product structures.
9903B1/B2AP 2.5WSAM 1.5WDual protocol
Technical Solution Display
This page presents technical specifications, performance, compatibility and applications. It is not an online retail listing.
Solution Overview
Performance, Advantages, Compatibility & Applications
Performance
- 2.5W AP watch and 1.5W SAM watch charging
- AP watch input current: 270-470 mA
- SAM watch input current: 270-300 mA
- 5V input through USB-A or USB-C
- 6.5 μH ±5% coil with Q factor ≥30
Advantages
- AP and SAM dual-protocol compatibility
- Stable and efficient charging without pop-up messages
- Flexible single-coil or dual-coil product architecture
- Suitable for compact single-watch and multi-device designs
Applications
- Single-watch wireless chargers
- 2-in-1 and 3-in-1 charging stations
- Dual-sided watch charging accessories
- Custom AP and SAM watch charging products
Performance & Technical Features
- Supports AP Watch S1-S10, SE and Ultra at up to 2.5W with dynamic decoding
- Supports SAM Galaxy Watch 1-7 and Ultra at up to 1.5W
- Stable and efficient charging without pop-up messages
- Dual-protocol dynamic-decoding architecture
- Supports magnetic-flip single-coil structures or front-and-back dual-coil structures
Technical Specifications
| Authentication chip | 9903B1 / 9903B2 |
|---|---|
| AP watch output | 2.5W max, dynamic decoding |
| SAM watch output | 1.5W max |
| Coil inductance | 6.5 μH ±5% |
| Coil Q factor | ≥30 |
| Magnet grade | GS 3600 |
| Spacer height | 0.8-1.2 mm |
| PCB | 2 layers, 0.8-1.0 mm thickness, immersion gold; inner 0.5 oz / outer 1 oz |
| AP watch input current | 270-470 mA |
| SAM watch input current | 270-300 mA |
| Input | 5V via USB-A or USB-C |
| Coil configurations | Magnetic-flip single coil or front-and-back dual coils |
Engineering Reference
JX183 Full Solution Sheet
Open the solution sheet in a new window to inspect every parameter at full size.
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