Table 1.
Input inventory for smartwatch life-cycle assessment.
| Component | Quantity | Details |
|---|---|---|
| Printed Wiring Board 2-layer | 7.07 cm2 | Standard PCB |
| Capacitor ceramic MLCC 0603 | 80 | Representative for all capacitors |
| Resistor flat chip 0402 | 462 | Representative for all resistors |
| Solder paste SnAg3Cu0.5 | 3 g | |
| OLED screen | 7.3 cm2 | Self-made (see supplementary) |
| Cell BR series (Li/poly-carbon monofluoride) | 6 g | Battery substitute |
| LED SMD high-efficiency with lens | 1 | |
| Plastic extrusion profile | 18 g | Case and strap substitute |
| IC BGA 48 (72 mg) 8 × 6 mm MPU | 1 | Main processor substitute |
| Filter SAW (25 mg) 3 × 7 × 1 | 3 | RxD frontend component |
| IC DFN 10 (22.3 mg) 3 × 3 mm CMOS | 1 | RxD frontend component |
| Transistor signal SOT-883 | 1 | Infineon switch substitute |
| IC BGA 48 (70 mg) 6 × 6 × 1.1 mm | 1 | Power amplifier substitute |
| IC WLP CSP 49 (10.2 mg) MPU generic | 1 | RF chip substitute |
| IC BGA 144 (181 mg) 10 × 10 mm | 0.01 | Power tracker substitute |
| IC WLP CSP 49 (10.2 mg) CMOS logic | 8 | Co-processor substitute |
| Soldering electricity | 0.533 kWh | |
| Use-phase electricity | 3.86 kWh | Assumes battery fully recharged every day for 3 years |