# ESP32-S3-WROOM-1U-N16

**Espressif Systems** · WiFi Modules · ESP32-S3-WROOM-1U

ESP32-S3-WROOM-1U-N16 from Espressif Systems, in a ESP32-S3-WROOM-1U. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference pin of the module. |
| 2 | 3V3 | power_in | Module supply input; the recommended supply range is 3.0 V to 3.6 V (typical 3.3 V), with at least 0.5 A delivered by the external supply. |
| 3 | EN | input | Chip enable: High turns the chip on, Low powers it off; do not leave this pin floating. |
| 4 | IO4 | bidirectional | GPIO4 with alternate functions RTC_GPIO4, TOUCH4 and ADC1_CH3. |
| 5 | IO5 | bidirectional | GPIO5 with alternate functions RTC_GPIO5, TOUCH5 and ADC1_CH4. |
| 6 | IO6 | bidirectional | GPIO6 with alternate functions RTC_GPIO6, TOUCH6 and ADC1_CH5. |
| 7 | IO7 | bidirectional | GPIO7 with alternate functions RTC_GPIO7, TOUCH7 and ADC1_CH6. |
| 8 | IO15 | bidirectional | GPIO15 with alternate functions RTC_GPIO15, U0RTS, ADC2_CH4 and XTAL_32K_P. |
| 9 | IO16 | bidirectional | GPIO16 with alternate functions RTC_GPIO16, U0CTS, ADC2_CH5 and XTAL_32K_N. |
| 10 | IO17 | bidirectional | GPIO17 with alternate functions RTC_GPIO17, U1TXD and ADC2_CH6. |
| 11 | IO18 | bidirectional | GPIO18 with alternate functions RTC_GPIO18, U1RXD, ADC2_CH7 and CLK_OUT3. |
| 12 | IO8 | bidirectional | GPIO8 with alternate functions RTC_GPIO8, TOUCH8, ADC1_CH7 and SUBSPICS1. |
| 13 | IO19 | bidirectional | GPIO19 with alternate functions RTC_GPIO19, U1RTS, ADC2_CH8, CLK_OUT2 and USB_D-. |
| 14 | IO20 | bidirectional | GPIO20 with alternate functions RTC_GPIO20, U1CTS, ADC2_CH9, CLK_OUT1 and USB_D+. |
| 15 | IO3 | bidirectional | GPIO3 with alternate functions RTC_GPIO3, TOUCH3 and ADC1_CH2; it is the JTAG signal-source strapping pin and is floating by default at reset. |
| 16 | IO46 | bidirectional | GPIO46 general-purpose I/O; it is a ROM message printing strapping pin with a weak pull-down (default 0). |
| 17 | IO9 | bidirectional | GPIO9 with alternate functions RTC_GPIO9, TOUCH9, ADC1_CH8, FSPIHD and SUBSPIHD. |
| 18 | IO10 | bidirectional | GPIO10 with alternate functions RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4 and SUBSPICS0. |
| 19 | IO11 | bidirectional | GPIO11 with alternate functions RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5 and SUBSPID. |
| 20 | IO12 | bidirectional | GPIO12 with alternate functions RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6 and SUBSPICLK. |
| 21 | IO13 | bidirectional | GPIO13 with alternate functions RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7 and SUBSPIQ. |
| 22 | IO14 | bidirectional | GPIO14 with alternate functions RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS and SUBSPIWP. |
| 23 | IO21 | bidirectional | GPIO21 with alternate function RTC_GPIO21. |
| 24 | IO47 | bidirectional | GPIO47 with alternate functions SPICLK_P_DIFF and SUBSPICLK_P_DIFF; on modules with ESP32-S3R16V its working voltage is 1.8 V. |
| 25 | IO48 | bidirectional | GPIO48 with alternate functions SPICLK_N_DIFF and SUBSPICLK_N_DIFF; on modules with ESP32-S3R16V its working voltage is 1.8 V. |
| 26 | IO45 | bidirectional | GPIO45 general-purpose I/O; it is the VDD_SPI voltage strapping pin with a weak pull-down (default 0). |
| 27 | IO0 | bidirectional | RTC_GPIO0 / GPIO0 with a weak pull-up (default 1) that is sampled as a chip boot mode strapping pin. |
| 28 | IO35 | bidirectional | GPIO35 with alternate functions SPIIO6, FSPID and SUBSPID; its default function is set by eFuse, and on R8/R16V modules it is reserved for the Octal SPI PSRAM. |
| 29 | IO36 | bidirectional | GPIO36 with alternate functions SPIIO7, FSPICLK and SUBSPICLK; its default function is set by eFuse, and on R8/R16V modules it is reserved for the Octal SPI PSRAM. |
| 30 | IO37 | bidirectional | GPIO37 with alternate functions SPIDQS, FSPIQ and SUBSPIQ; its default function is set by eFuse, and on R8/R16V modules it is reserved for the Octal SPI PSRAM. |
| 31 | IO38 | bidirectional | GPIO38 with alternate functions FSPIWP and SUBSPIWP. |
| 32 | IO39 | bidirectional | GPIO39 with alternate functions MTCK, CLK_OUT3 and SUBSPICS1. |
| 33 | IO40 | bidirectional | GPIO40 with alternate functions MTDO and CLK_OUT2. |
| 34 | IO41 | bidirectional | GPIO41 with alternate functions MTDI and CLK_OUT1. |
| 35 | IO42 | bidirectional | GPIO42 with alternate function MTMS. |
| 36 | RXD0 | bidirectional | UART0 receive (U0RXD) with alternate functions GPIO44 and CLK_OUT2. |
| 37 | TXD0 | bidirectional | UART0 transmit (U0TXD) with alternate functions GPIO43 and CLK_OUT1. |
| 38 | IO2 | bidirectional | GPIO2 with alternate functions RTC_GPIO2, TOUCH2 and ADC1_CH1. |
| 39 | IO1 | bidirectional | GPIO1 with alternate functions RTC_GPIO1, TOUCH1 and ADC1_CH0. |
| 40 | GND | power_in | Ground pin of the module. |
| 41 | EPAD | power_in | Exposed ground pad; soldering it to the base-board ground is optional and improves thermal performance, but excess solder paste can lift the module. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Espressif Systems |
| Package | ESP32-S3-WROOM-1U |
| Category | IoT/Communication Modules |
| Pins | 41 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power supply voltage (absolute maximum) | VDD33 | -0.3 |  | 3.6 | V |  | 27 |
| Storage temperature | TSTORE | -40 |  | 105 | °C |  | 27 |
| Power supply voltage | VDD33 | 3 | 3.3 | 3.6 | V |  | 27 |
| Current delivered by external power supply | IVDD | 0.5 |  |  | A |  | 27 |
| Operating ambient temperature, 85 °C version | TA | -40 |  | 85 | °C | 85 °C version | 27 |
| Pin capacitance | CIN |  | 2 |  | pF |  | 27 |
| High-level input current | IIH |  |  | 50 | nA |  | 27 |
| Low-level input current | IIL |  |  | 50 | nA |  | 27 |
| High-level source current | IOH |  | 40 |  | mA | VDD1 = 3.3 V, VOH >= 2.64 V, PAD_DRIVER = 3 | 27 |
| Low-level sink current | IOL |  | 28 |  | mA | VDD1 = 3.3 V, VOL = 0.495 V, PAD_DRIVER = 3 | 27 |
| Internal weak pull-up resistor | RPU |  | 45 |  | kΩ |  | 27 |
| Internal weak pull-down resistor | RPD |  | 45 |  | kΩ |  | 27 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Solder: Sn-Ag-Cu (SAC305) lead-free solder Temperature (°C) | 47 |

## CAD (KiCad official)

- Symbol: `ESP32-S3-WROOM-1U-N16`
- Footprint: `PCM_Espressif:ESP32-S3-WROOM-1U`
- 3D model: ESP32-S3-WROOM-1U (KiCad packages3D, STEP)
- 3D model files: `esp32-s3-wroom-1u-n16-etched.step` / `esp32-s3-wroom-1u-n16-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esp32-s3-wroom-1u-n16.step` / `esp32-s3-wroom-1u-n16.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Espressif Systems datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-1_wroom-1u_datasheet_en.pdf) (53 pp, sha256 `27d71971da07c280`, retrieved 2026-10-28, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/esp32-s3-wroom-1u-n16-datasheet.pdf)