The table below lists the maximum current which can be sourced or sinked for a given pin on an Arduino Due board:
| Due Pin Number | SAM3X Pin Name | Mapped Pin Name | IOH (or ISOURCE) in mA | IOL (or ISINK) in mA |
|---|---|---|---|---|
| 0 | PA8 | RX0 | 3 | 6 |
| 1 | PA9 | TX0 | 15 | 9 |
| 2 | PB25 | Digital Pin 2 | 3 | 6 |
| 3 | PC28 | Digital Pin 3 | 15 | 9 |
| 4 | connected to both PA29 and PC26 | Digital Pin 4 | 15 | 9 |
| 5 | PC25 | Digital Pin 5 | 15 | 9 |
| 6 | PC24 | Digital Pin 6 | 15 | 9 |
| 7 | PC23 | Digital Pin 7 | 15 | 9 |
| 8 | PC22 | Digital Pin 8 | 15 | 9 |
| 9 | PC21 | Digital Pin 9 | 15 | 9 |
| 10 | connected to both PA28 and PC29 | Digital Pin 10 | 15 | 9 |
| 11 | PD7 | Digital Pin 11 | 15 | 9 |
| 12 | PD8 | Digital Pin 12 | 15 | 9 |
| 13 | PB27 | Digital Pin 13 / Amber LED “L” | 3 | 6 |
| 14 | PD4 | TX3 | 15 | 9 |
| 15 | PD5 | RX3 | 15 | 9 |
| 16 | PA13 | TX2 | 3 | 6 |
| 17 | PA12 | RX2 | 3 | 6 |
| 18 | PA11 | TX1 | 3 | 6 |
| 19 | PA10 | RX1 | 3 | 6 |
| 20 | PB12 | SDA | 3 | 6 |
| 21 | PB13 | SCL | 3 | 6 |
| 22 | PB26 | Digital Pin 22 | 3 | 6 |
| 23 | PA14 | Digital Pin 23 | 15 | 9 |
| 24 | PA15 | Digital Pin 24 | 15 | 9 |
| 25 | PD0 | Digital Pin 25 | 15 | 9 |
| 26 | PD1 | Digital pin 26 | 15 | 9 |
| 27 | PD2 | Digital Pin 27 | 15 | 9 |
| 28 | PD3 | Digital Pin 28 | 15 | 9 |
| 29 | PD6 | Digital Pin 29 | 15 | 9 |
| 30 | PD9 | Digital Pin 30 | 15 | 9 |
| 31 | PA7 | Digital Pin 31 | 15 | 9 |
| 32 | PD10 | Digital Pin 32 | 15 | 9 |
| 33 | PC1 | Digital Pin 33 | 15 | 9 |
| 34 | PC2 | Digital Pin 34 | 15 | 9 |
| 35 | PC3 | Digital Pin 35 | 15 | 9 |
| 36 | PC4 | Digital Pin 36 | 15 | 9 |
| 37 | PC5 | Digital Pin 37 | 15 | 9 |
| 38 | PC6 | Digital Pin 38 | 15 | 9 |
| 39 | PC7 | Digital Pin 39 | 15 | 9 |
| 40 | PC8 | Digital Pin 40 | 15 | 9 |
| 41 | PC9 | Digital Pin 41 | 15 | 9 |
| 42 | PA19 | Digital Pin 42 | 15 | 9 |
| 43 | PA20 | Digital Pin 43 | 3 | 6 |
| 44 | PC19 | Digital Pin 44 | 15 | 9 |
| 45 | PC18 | Digital Pin 45 | 15 | 9 |
| 46 | PC17 | Digital Pin 46 | 15 | 9 |
| 47 | PC16 | Digital Pin 47 | 15 | 9 |
| 48 | PC15 | Digital Pin 48 | 15 | 9 |
| 49 | PC14 | Digital Pin 49 | 15 | 9 |
| 50 | PC13 | Digital Pin 50 | 15 | 9 |
| 51 | PC12 | Digital Pin 51 | 15 | 9 |
| 52 | PB21 | Digital Pin 52 | 3 | 6 |
| 53 | PB14 | Digital Pin 53 | 15 | 9 |
| 54 | PA16 | Analog In 0 | 3 | 6 |
| 55 | PA24 | Analog In 1 | 3 | 6 |
| 56 | PA23 | Analog In 2 | 3 | 6 |
| 57 | PA22 | Analog In 3 | 3 | 6 |
| 58 | PA6 | Analog In 4 | 3 | 6 |
| 59 | PA4 | Analog In 5 | 3 | 6 |
| 60 | PA3 | Analog In 6 | 3 | 6 |
| 61 | PA2 | Analog In 7 | 3 | 6 |
| 62 | PB17 | Analog In 8 | 3 | 6 |
| 63 | PB18 | Analog In 9 | 3 | 6 |
| 64 | PB19 | Analog In 10 | 3 | 6 |
| 65 | PB20 | Analog In 11 | 3 | 6 |
| 66 | PB15 | DAC0 | 3 | 6 |
| 67 | PB16 | DAC1 | 3 | 6 |
| 68 | PA1 | CANRX | 3 | 6 |
| 69 | PA0 | CANTX | 15 | 9 |
| 70 | PA17 | SDA1 | 3 | 6 |
| 71 | PA18 | SCL2 | 15 | 9 |
| 72 | PC30 | LED “RX” | 15 | 9 |
| 73 | PA21 | LED “TX” | 3 | 6 |
| 74 | PA25 | (MISO) | 15 | 9 |
| 75 | PA26 | (MOSI) | 15 | 9 |
| 76 | PA27 | (SCLK) | 15 | 9 |
| 77 | PA28 | (NPCS0) | 15 | 9 |
| 78 | PB23 | (unconnected) | 15 | 9 |
| USB | PB11 | ID | 15 | 9 |
| USB | PB10 | VBOF | 15 | 9 |
References:
Note: The ratings are on pages 1390 through 1392 of the datasheet for the SAM3X.
Thanks to the folks at the Arduino IRC channel(#arduino on freenode) for pointing me in the right direction!