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ESP32-S2-SOLO-N4
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Espressif Systems RF and Wireless, 40-SMD Module. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ESP32-S2-SOLO-N4
Espressif Systems · RF and Wireless · 40-SMD Module
ESP32-S2-SOLO-N4 from Espressif Systems, in a 40-SMD Module. 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 3.3 V supply pin; Table 10 gives VDD33 as 3.0 V minimum, 3.3 V typical and 3.6 V maximum. |
| 3 | EN | input | High enables the chip and low powers it off, and the pin must not be left 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, ADC2_CH6 and DAC_1. |
| 11 | IO18 | bidirectional | GPIO18 with alternate functions RTC_GPIO18, U1RXD, ADC2_CH7, DAC_2 and CLK_OUT3. |
| 12 | IO8 | bidirectional | GPIO8 with alternate functions RTC_GPIO8, TOUCH8 and ADC1_CH7. |
| 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. |
| 16 | IO46 | input | GPIO46, input-only pin that is also a strapping pin controlling boot mode and ROM message printing. |
| 17 | IO9 | bidirectional | GPIO9 with alternate functions RTC_GPIO9, TOUCH9, ADC1_CH8 and FSPIHD. |
| 18 | IO10 | bidirectional | GPIO10 with alternate functions RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0 and FSPIIO4. |
| 19 | IO11 | bidirectional | GPIO11 with alternate functions RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID and FSPIIO5. |
| 20 | IO12 | bidirectional | GPIO12 with alternate functions RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK and FSPIIO6. |
| 21 | IO13 | bidirectional | GPIO13 with alternate functions RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ and FSPIIO7. |
| 22 | IO14 | bidirectional | GPIO14 with alternate functions RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP and FSPIDQS. |
| 23 | IO21 | bidirectional | GPIO21 with alternate function RTC_GPIO21. |
| 24 | IO33 | bidirectional | GPIO33 with alternate functions SPIIO4 and FSPIHD. |
| 25 | IO34 | bidirectional | GPIO34 with alternate functions SPIIO5 and FSPICS0. |
| 26 | IO45 | bidirectional | GPIO45, which is also a strapping pin that sets the VDD_SPI voltage at reset. |
| 27 | IO0 | bidirectional | GPIO0 with alternate function RTC_GPIO0; it is a strapping pin for chip boot mode with a default pull-up. |
| 28 | IO35 | bidirectional | GPIO35 with alternate functions SPIIO6 and FSPID. |
| 29 | IO36 | bidirectional | GPIO36 with alternate functions SPIIO7 and FSPICLK. |
| 30 | IO37 | bidirectional | GPIO37 with alternate functions SPIDQS and FSPIQ. |
| 31 | IO38 | bidirectional | GPIO38 with alternate function FSPIWP. |
| 32 | IO39 | bidirectional | GPIO39 with alternate functions MTCK and CLK_OUT3. |
| 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; ROM messages print here by default. |
| 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 thermal pad; soldering it to the base-board ground optimizes thermal performance, applying the correct amount of solder paste. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Espressif Systems |
| Package | 40-SMD Module |
| Category | RF and Wireless |
| 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 | 15 | ||
| Storage temperature | TSTORE | -40 | 105 | °C | 15 | ||
| Power supply voltage | VDD33 | 3 | 3.3 | 3.6 | V | 15 | |
| Current delivered by external power supply | IVDD | 0.5 | A | 15 | |||
| Operating ambient temperature | TA | -40 | 85 | °C | 85 °C version | 15 | |
| High-level input current | IIH | 50 | nA | 15 | |||
| Low-level input current | IIL | 50 | nA | 15 | |||
| TX EVM Test | -25 | -10 | dB | 802.11b, 1 Mbps, DSSS | 18 | ||
| TX EVM Test | -25 | -5 | dB | 802.11g, 6 Mbps, OFDM | 18 | ||
| TX EVM Test | -28 | -25 | dB | 802.11g, 54 Mbps, OFDM | 18 | ||
| TX EVM Test | -27 | -5 | dB | 802.11n, HT20, MCS0 | 18 | ||
| TX EVM Test | -30.5 | -27 | dB | 802.11n, HT20, MCS7 | 18 | ||
| TX EVM Test | -30 | -27 | dB | 802.11n, HT40, MCS7 | 18 |
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 alloy Figure 13: Reflow Profile | 28 |
CAD (KiCad official)
- Symbol:
ESP32-S2-SOLO-N4 - Footprint:
PCM_Espressif:ESP32-S2-SOLO - 3D model: 40-SMD Module (KiCad packages3D, STEP)
- 3D model files:
esp32-s2-solo-n4-etched.step/esp32-s2-solo-n4-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);esp32-s2-solo-n4.step/esp32-s2-solo-n4.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Espressif Systems datasheet (34 pp, sha256
dbfee97a9809455c, retrieved 2026-10-28, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# ESP32-S2-SOLO-N4
**Espressif Systems** · RF and Wireless · 40-SMD Module
ESP32-S2-SOLO-N4 from Espressif Systems, in a 40-SMD Module. 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 3.3 V supply pin; Table 10 gives VDD33 as 3.0 V minimum, 3.3 V typical and 3.6 V maximum. |
| 3 | EN | input | High enables the chip and low powers it off, and the pin must not be left 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, ADC2_CH6 and DAC_1. |
| 11 | IO18 | bidirectional | GPIO18 with alternate functions RTC_GPIO18, U1RXD, ADC2_CH7, DAC_2 and CLK_OUT3. |
| 12 | IO8 | bidirectional | GPIO8 with alternate functions RTC_GPIO8, TOUCH8 and ADC1_CH7. |
| 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. |
| 16 | IO46 | input | GPIO46, input-only pin that is also a strapping pin controlling boot mode and ROM message printing. |
| 17 | IO9 | bidirectional | GPIO9 with alternate functions RTC_GPIO9, TOUCH9, ADC1_CH8 and FSPIHD. |
| 18 | IO10 | bidirectional | GPIO10 with alternate functions RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0 and FSPIIO4. |
| 19 | IO11 | bidirectional | GPIO11 with alternate functions RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID and FSPIIO5. |
| 20 | IO12 | bidirectional | GPIO12 with alternate functions RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK and FSPIIO6. |
| 21 | IO13 | bidirectional | GPIO13 with alternate functions RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ and FSPIIO7. |
| 22 | IO14 | bidirectional | GPIO14 with alternate functions RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP and FSPIDQS. |
| 23 | IO21 | bidirectional | GPIO21 with alternate function RTC_GPIO21. |
| 24 | IO33 | bidirectional | GPIO33 with alternate functions SPIIO4 and FSPIHD. |
| 25 | IO34 | bidirectional | GPIO34 with alternate functions SPIIO5 and FSPICS0. |
| 26 | IO45 | bidirectional | GPIO45, which is also a strapping pin that sets the VDD_SPI voltage at reset. |
| 27 | IO0 | bidirectional | GPIO0 with alternate function RTC_GPIO0; it is a strapping pin for chip boot mode with a default pull-up. |
| 28 | IO35 | bidirectional | GPIO35 with alternate functions SPIIO6 and FSPID. |
| 29 | IO36 | bidirectional | GPIO36 with alternate functions SPIIO7 and FSPICLK. |
| 30 | IO37 | bidirectional | GPIO37 with alternate functions SPIDQS and FSPIQ. |
| 31 | IO38 | bidirectional | GPIO38 with alternate function FSPIWP. |
| 32 | IO39 | bidirectional | GPIO39 with alternate functions MTCK and CLK_OUT3. |
| 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; ROM messages print here by default. |
| 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 thermal pad; soldering it to the base-board ground optimizes thermal performance, applying the correct amount of solder paste. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Espressif Systems |
| Package | 40-SMD Module |
| Category | RF and Wireless |
| 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 | | 15 |
| Storage temperature | TSTORE | -40 | | 105 | °C | | 15 |
| Power supply voltage | VDD33 | 3 | 3.3 | 3.6 | V | | 15 |
| Current delivered by external power supply | IVDD | 0.5 | | | A | | 15 |
| Operating ambient temperature | TA | -40 | | 85 | °C | 85 °C version | 15 |
| High-level input current | IIH | | | 50 | nA | | 15 |
| Low-level input current | IIL | | | 50 | nA | | 15 |
| TX EVM Test | | | -25 | -10 | dB | 802.11b, 1 Mbps, DSSS | 18 |
| TX EVM Test | | | -25 | -5 | dB | 802.11g, 6 Mbps, OFDM | 18 |
| TX EVM Test | | | -28 | -25 | dB | 802.11g, 54 Mbps, OFDM | 18 |
| TX EVM Test | | | -27 | -5 | dB | 802.11n, HT20, MCS0 | 18 |
| TX EVM Test | | | -30.5 | -27 | dB | 802.11n, HT20, MCS7 | 18 |
| TX EVM Test | | | -30 | -27 | dB | 802.11n, HT40, MCS7 | 18 |
## 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 alloy Figure 13: Reflow Profile | 28 |
## CAD (KiCad official)
- Symbol: `ESP32-S2-SOLO-N4`
- Footprint: `PCM_Espressif:ESP32-S2-SOLO`
- 3D model: 40-SMD Module (KiCad packages3D, STEP)
- 3D model files: `esp32-s2-solo-n4-etched.step` / `esp32-s2-solo-n4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esp32-s2-solo-n4.step` / `esp32-s2-solo-n4.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-s2-solo_esp32-s2-solo-u_datasheet_en.pdf) (34 pp, sha256 `dbfee97a9809455c`, 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-s2-solo-n4-datasheet.pdf)