ADA4918 · AdafruitActive
Adafruit product #4918 — built on TCA8418.
| Part number | ADA4918 |
|---|---|
| Manufacturer | Adafruit |
| Category | Displays & LEDs › LED Matrix & Segment |
| Pins | 26 |
Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | GND | ground | |
| 2 | C9 | bidirectional | |
| 3 | C8 | bidirectional | |
| 4 | C7 | bidirectional | |
| 5 | C6 | bidirectional | |
| 6 | C5 | bidirectional | |
| 7 | C4 | bidirectional | |
| 8 | C3 | bidirectional | |
| 9 | C2 | bidirectional | |
| 10 | C1 | bidirectional | |
| 11 | C0 | bidirectional | |
| 12 | R0 | bidirectional | |
| 13 | R1 | bidirectional | |
| 14 | VCC | power | |
| 15 | 3.3V | power | |
| 16 | GND | ground | |
| 17 | SCL | bidirectional | |
| 18 | SDA | bidirectional | |
| 19 | INT | bidirectional | |
| 20 | RST | bidirectional | |
| 21 | R7 | bidirectional | |
| 22 | R6 | bidirectional | |
| 23 | R5 | bidirectional | |
| 24 | R4 | bidirectional | |
| 25 | R3 | bidirectional | |
| 26 | R2 | bidirectional |
Schematic symbol and footprint
Footprint: Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout - STEMMA QT / Qwiic (header pads) — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.
Datasheet
Where to buy
Stock and prices from the suppliers, checked 2026-10-08; excluding tax and shipping.
Related parts
16x8 1.2" LED Matrix+Backpack UltraBright Round YellowGreen LEDsADA2036
Adafruit 0.54" Quad Alphanumeric FeatherWing Display - BlueADA3128
Adafruit 0.54" Quad Alphanumeric FeatherWing Display - GreenADA3129
Adafruit 0.54" Quad Alphanumeric FeatherWing Display - RedADA3130
Adafruit 0.54" Quad Alphanumeric FeatherWing Display - WhiteADA3127
Adafruit 0.54" Quad Alphanumeric FeatherWing Display - YellowADA3131
Adafruit 0.56" 4-Digit 7-Segment Display w/ FeatherWing - WhiteADA3109
Adafruit 0.56" 4-Digit 7-Segment FeatherWing Display - BlueADA3106