USB PD Power & Type-C Current Tier
Compute PD power, identify the Type-C current tier, check whether an E-Marker cable is mandatory, and get wire-gauge advice from current density.
Key points
USB PD Power & Type-C Current Tier: Compute PD power, identify the Type-C current tier, check whether an E-Marker cable is mandatory, and get wire-gauge advice from current density. Formula: P = V × I ｜ above 3A an E-Marked cable is required. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. The CC pin resistors set the current: a sink presents Rd = 5.1kΩ and the cable E-Marker advertises 3A or 5A capability. PD negotiates over CC; A-to-C cables carry no E-Marker and are limited to 3A.
Inputs
P = V × I ｜ above 3A an E-Marked cable is requiredCalculation model (updates with parameters)
| Power delivered | 18.0 W | |
| Type-C current tier | 3A tier | |
| E-Marker required | No (a 3A cable suffices) | |
| Suggested wire gauge | 20 AWG（0.518 mm²） | 按 4.0 A/mm² Current density |
| Cable drop (round trip) | 0.240 V | 1.00m × 60mΩ/m × 2 |
| Cable loss | 0.48 W | 占输出 2.7% |
Engineering notes
- The CC pin resistors set the current: a sink presents Rd = 5.1kΩ and the cable E-Marker advertises 3A or 5A capability.
- PD negotiates over CC; A-to-C cables carry no E-Marker and are limited to 3A.
FAQ
- What is USB PD Power & Type-C Current Tier for?
- Compute PD power, identify the Type-C current tier, check whether an E-Marker cable is mandatory, and get wire-gauge advice from current density.
- What is the formula for USB PD Power & Type-C Current Tier?
- Core formula: P = V × I ｜ above 3A an E-Marked cable is required. The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using USB PD Power & Type-C Current Tier?
- The CC pin resistors set the current: a sink presents Rd = 5.1kΩ and the cable E-Marker advertises 3A or 5A capability. PD negotiates over CC; A-to-C cables carry no E-Marker and are limited to 3A.
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