# ESP32-S3-WROOM-1-N4R2

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

ESP32-S3-WROOM-1-N4R2 from Espressif Systems, in a ESP32-S3-WROOM-1. 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 | Power supply input; VDD33 is 3.0 V to 3.6 V (3.3 V typical) with an absolute maximum of 3.6 V, and the external supply should deliver at least 0.5 A. |
| 3 | EN | input | Chip enable: high enables the chip and low powers it off, and the pin must not be left floating. |
| 4 | IO4 | bidirectional | General-purpose I/O GPIO4, also usable as RTC_GPIO4, TOUCH4 and ADC1_CH3. |
| 5 | IO5 | bidirectional | General-purpose I/O GPIO5, also usable as RTC_GPIO5, TOUCH5 and ADC1_CH4. |
| 6 | IO6 | bidirectional | General-purpose I/O GPIO6, also usable as RTC_GPIO6, TOUCH6 and ADC1_CH5. |
| 7 | IO7 | bidirectional | General-purpose I/O GPIO7, also usable as RTC_GPIO7, TOUCH7 and ADC1_CH6. |
| 8 | IO15 | bidirectional | General-purpose I/O GPIO15, also usable as RTC_GPIO15, U0RTS, ADC2_CH4 and XTAL_32K_P. |
| 9 | IO16 | bidirectional | General-purpose I/O GPIO16, also usable as RTC_GPIO16, U0CTS, ADC2_CH5 and XTAL_32K_N. |
| 10 | IO17 | bidirectional | General-purpose I/O GPIO17, also usable as RTC_GPIO17, U1TXD and ADC2_CH6. |
| 11 | IO18 | bidirectional | General-purpose I/O GPIO18, also usable as RTC_GPIO18, U1RXD, ADC2_CH7 and CLK_OUT3. |
| 12 | IO8 | bidirectional | General-purpose I/O GPIO8, also usable as RTC_GPIO8, TOUCH8, ADC1_CH7 and SUBSPICS1. |
| 13 | IO19 | bidirectional | General-purpose I/O GPIO19, also usable as RTC_GPIO19, U1RTS, ADC2_CH8, CLK_OUT2 and USB_D-. |
| 14 | IO20 | bidirectional | General-purpose I/O GPIO20, also usable as RTC_GPIO20, U1CTS, ADC2_CH9, CLK_OUT1 and USB_D+. |
| 15 | IO3 | bidirectional | General-purpose I/O GPIO3, also usable as RTC_GPIO3, TOUCH3 and ADC1_CH2; it is a strapping pin for the JTAG signal source and is floating by default at reset. |
| 16 | IO46 | bidirectional | General-purpose I/O GPIO46; it is a strapping pin for chip boot mode and ROM message printing, with a weak pull-down by default. |
| 17 | IO9 | bidirectional | General-purpose I/O GPIO9, also usable as RTC_GPIO9, TOUCH9, ADC1_CH8, FSPIHD and SUBSPIHD. |
| 18 | IO10 | bidirectional | General-purpose I/O GPIO10, also usable as RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4 and SUBSPICS0. |
| 19 | IO11 | bidirectional | General-purpose I/O GPIO11, also usable as RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5 and SUBSPID. |
| 20 | IO12 | bidirectional | General-purpose I/O GPIO12, also usable as RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6 and SUBSPICLK. |
| 21 | IO13 | bidirectional | General-purpose I/O GPIO13, also usable as RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7 and SUBSPIQ. |
| 22 | IO14 | bidirectional | General-purpose I/O GPIO14, also usable as RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS and SUBSPIWP. |
| 23 | IO21 | bidirectional | General-purpose I/O GPIO21, also usable as RTC_GPIO21. |
| 24 | IO47 | bidirectional | General-purpose I/O GPIO47, also usable as SPICLK_P_DIFF and SUBSPICLK_P_DIFF; on modules embedding ESP32-S3R16V its working voltage is 1.8 V instead of 3.3 V. |
| 25 | IO48 | bidirectional | General-purpose I/O GPIO48, also usable as SPICLK_N_DIFF and SUBSPICLK_N_DIFF; on modules embedding ESP32-S3R16V its working voltage is 1.8 V instead of 3.3 V. |
| 26 | IO45 | bidirectional | General-purpose I/O GPIO45; it is a strapping pin that sets the VDD_SPI voltage, with a weak pull-down by default. |
| 27 | IO0 | bidirectional | General-purpose I/O GPIO0, also usable as RTC_GPIO0; it is a strapping pin for chip boot mode, with a weak pull-up by default. |
| 28 | IO35 | bidirectional | General-purpose I/O GPIO35, also usable as SPIIO6, FSPID and SUBSPID; the default function is set by eFuse, and on modules with Octal SPI PSRAM (ESP32-S3R8 or ESP32-S3R16V) this pin is not available for other uses. |
| 29 | IO36 | bidirectional | General-purpose I/O GPIO36, also usable as SPIIO7, FSPICLK and SUBSPICLK; the default function is set by eFuse, and on modules with Octal SPI PSRAM (ESP32-S3R8 or ESP32-S3R16V) this pin is not available for other uses. |
| 30 | IO37 | bidirectional | General-purpose I/O GPIO37, also usable as SPIDQS, FSPIQ and SUBSPIQ; the default function is set by eFuse, and on modules with Octal SPI PSRAM (ESP32-S3R8 or ESP32-S3R16V) this pin is not available for other uses. |
| 31 | IO38 | bidirectional | General-purpose I/O GPIO38, also usable as FSPIWP and SUBSPIWP. |
| 32 | IO39 | bidirectional | General-purpose I/O GPIO39, also usable as MTCK, CLK_OUT3 and SUBSPICS1. |
| 33 | IO40 | bidirectional | General-purpose I/O GPIO40, also usable as MTDO and CLK_OUT2. |
| 34 | IO41 | bidirectional | General-purpose I/O GPIO41, also usable as MTDI and CLK_OUT1. |
| 35 | IO42 | bidirectional | General-purpose I/O GPIO42, also usable as MTMS. |
| 36 | RXD0 | bidirectional | UART0 receive pin U0RXD, also usable as GPIO44 and CLK_OUT2. |
| 37 | TXD0 | bidirectional | UART0 transmit pin U0TXD, also usable as GPIO43 and CLK_OUT1. |
| 38 | IO2 | bidirectional | General-purpose I/O GPIO2, also usable as RTC_GPIO2, TOUCH2 and ADC1_CH1. |
| 39 | IO1 | bidirectional | General-purpose I/O GPIO1, also usable as RTC_GPIO1, TOUCH1 and ADC1_CH0. |
| 40 | GND | power_in | Ground reference pin of the module. |
| 41 | EPAD | power_in | Exposed ground pad; soldering it to the base-board ground is optional but improves thermal performance, and too much solder paste can degrade adhesion of the other pins. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Espressif Systems |
| Package | ESP32-S3-WROOM-1 |
| 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 | 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 | TA | -40 |  | 85 | °C | 85 °C version | 27 |
| Low-level input voltage | VIL | -0.3 |  |  | V | 3.3 V, 25 °C | 27 |
| High-level input current | IIH |  |  | 50 | nA | 3.3 V, 25 °C | 27 |
| Low-level input current | IIL |  |  | 50 | nA | 3.3 V, 25 °C | 27 |
| RF transmit power range |  | -24 |  | 20 | dBm |  | 34 |
| PSRAM power supply voltage | VCC | 1.62 | 1.8 | 1.98 | V | Power supply voltage (1.8 V) | 31 |
| PSRAM power supply voltage | VCC | 2.7 | 3.3 | 3.6 | V | Power supply voltage (3.3 V) | 31 |
| PSRAM maximum clock frequency | FC | 80 |  |  | MHz | Maximum clock frequency | 31 |

## 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-1-N4R2`
- Footprint: `PCM_Espressif:ESP32-S3-WROOM-1`
- 3D model: ESP32-S3-WROOM-1 (KiCad packages3D, STEP)
- 3D model files: `esp32-s3-wroom-1-n4r2-etched.step` / `esp32-s3-wroom-1-n4r2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esp32-s3-wroom-1-n4r2.step` / `esp32-s3-wroom-1-n4r2.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-1-n4r2-datasheet.pdf)