USB-C Power Delivery Explained: Cables, Wattage & Compatibility (2026)
Mar 21, 2026
USB-C has become the universal connector for power and data, but not all USB-C cables are equal. This guide explains power delivery tiers, cable ratings, and how to spec the right cable.
USB-C Power Delivery Tiers
| PD Tier | Voltage | Max Current | Max Power | Typical Use |
|---|---|---|---|---|
| PD 2.0 | 5-20V | 3A/5A | 60W/100W | Laptops, monitors |
| PD 3.0 | 5-20V | 3A/5A | 60W/100W | + PPS for phones |
| PD 3.1 EPR | 5-48V | 5A | 240W | Gaming laptops |
Standard USB-C cables support 60W (3A at 20V). For 100W, you need an e-marker chip and 5A-rated conductors. For 240W EPR, the cable must be specifically rated for 48V/5A.
Data Speed vs Power
A 100W cable might only support USB 2.0 (480 Mbps) if it lacks data pairs. For docking stations or Thunderbolt, verify both the power rating AND data specification.
Cable Length Matters
USB4 and Thunderbolt 4 are rated 40 Gbps for cables up to 0.8m, dropping to 20 Gbps at 2m. For runs over 3m, use active USB-C cables or USB-C over Cat6 extenders.
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