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ESP32-S2-SOLO-N4R2

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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-N4R2

Espressif Systems · RF and Wireless · 40-SMD Module

ESP32-S2-SOLO-N4R2 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 pin of the module.
2 3V3 power_in Module power supply input; the recommended VDD33 supply range is 3.0 V to 3.6 V with 3.3 V typical.
3 EN input Chip enable: high turns the chip on and low powers it off, and the pin must not be left floating.
4 IO4 bidirectional Multifunction I/O with RTC_GPIO4, GPIO4, TOUCH4 and ADC1_CH3 functions.
5 IO5 bidirectional Multifunction I/O with RTC_GPIO5, GPIO5, TOUCH5 and ADC1_CH4 functions.
6 IO6 bidirectional Multifunction I/O with RTC_GPIO6, GPIO6, TOUCH6 and ADC1_CH5 functions.
7 IO7 bidirectional Multifunction I/O with RTC_GPIO7, GPIO7, TOUCH7 and ADC1_CH6 functions.
8 IO15 bidirectional Multifunction I/O with RTC_GPIO15, GPIO15, U0RTS, ADC2_CH4 and XTAL_32K_P functions.
9 IO16 bidirectional Multifunction I/O with RTC_GPIO16, GPIO16, U0CTS, ADC2_CH5 and XTAL_32K_N functions.
10 IO17 bidirectional Multifunction I/O with RTC_GPIO17, GPIO17, U1TXD, ADC2_CH6 and DAC_1 functions.
11 IO18 bidirectional Multifunction I/O with RTC_GPIO18, GPIO18, U1RXD, ADC2_CH7, DAC_2 and CLK_OUT3 functions.
12 IO8 bidirectional Multifunction I/O with RTC_GPIO8, GPIO8, TOUCH8 and ADC1_CH7 functions.
13 IO19 bidirectional Multifunction I/O with RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2 and USB_D- functions.
14 IO20 bidirectional Multifunction I/O with RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1 and USB_D+ functions.
15 IO3 bidirectional Multifunction I/O with RTC_GPIO3, GPIO3, TOUCH3 and ADC1_CH2 functions.
16 IO46 input Input-only GPIO46, which is also a strapping pin for boot mode and ROM message printing control and defaults to pull-down.
17 IO9 bidirectional Multifunction I/O with RTC_GPIO9, GPIO9, TOUCH9, ADC1_CH8 and FSPIHD functions.
18 IO10 bidirectional Multifunction I/O with RTC_GPIO10, GPIO10, TOUCH10, ADC1_CH9, FSPICS0 and FSPIIO4 functions.
19 IO11 bidirectional Multifunction I/O with RTC_GPIO11, GPIO11, TOUCH11, ADC2_CH0, FSPID and FSPIIO5 functions.
20 IO12 bidirectional Multifunction I/O with RTC_GPIO12, GPIO12, TOUCH12, ADC2_CH1, FSPICLK and FSPIIO6 functions.
21 IO13 bidirectional Multifunction I/O with RTC_GPIO13, GPIO13, TOUCH13, ADC2_CH2, FSPIQ and FSPIIO7 functions.
22 IO14 bidirectional Multifunction I/O with RTC_GPIO14, GPIO14, TOUCH14, ADC2_CH3, FSPIWP and FSPIDQS functions.
23 IO21 bidirectional Multifunction I/O with RTC_GPIO21 and GPIO21 functions.
24 IO33 bidirectional Multifunction I/O with SPIIO4, GPIO33 and FSPIHD functions.
25 IO34 bidirectional Multifunction I/O with SPIIO5, GPIO34 and FSPICS0 functions.
26 IO45 bidirectional Multifunction I/O with GPIO45 function; it is also a strapping pin for VDD_SPI voltage control and defaults to pull-down.
27 IO0 bidirectional Multifunction I/O with RTC_GPIO0 and GPIO0 functions; it is also a strapping pin for boot mode and defaults to pull-up.
28 IO35 bidirectional Multifunction I/O with SPIIO6, GPIO35 and FSPID functions.
29 IO36 bidirectional Multifunction I/O with SPIIO7, GPIO36 and FSPICLK functions.
30 IO37 bidirectional Multifunction I/O with SPIDQS, GPIO37 and FSPIQ functions.
31 IO38 bidirectional Multifunction I/O with GPIO38 and FSPIWP functions.
32 IO39 bidirectional Multifunction I/O with MTCK, GPIO39 and CLK_OUT3 functions.
33 IO40 bidirectional Multifunction I/O with MTDO, GPIO40 and CLK_OUT2 functions.
34 IO41 bidirectional Multifunction I/O with MTDI, GPIO41 and CLK_OUT1 functions.
35 IO42 bidirectional Multifunction I/O with MTMS and GPIO42 functions.
36 RXD0 bidirectional Multifunction I/O with U0RXD, GPIO44 and CLK_OUT2 functions.
37 TXD0 bidirectional Multifunction I/O with U0TXD, GPIO43 and CLK_OUT1 functions; by default ROM boot messages are printed on this pin.
38 IO2 bidirectional Multifunction I/O with RTC_GPIO2, GPIO2, TOUCH2 and ADC1_CH1 functions.
39 IO1 bidirectional Multifunction I/O with RTC_GPIO1, GPIO1, TOUCH1 and ADC1_CH0 functions.
40 GND power_in Ground pin of the module.
41 EPAD power_in Ground exposed pad; soldering it to the base board ground is optional and improves thermal performance, but excess solder paste can degrade adhesion of the other pins.

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
Low-level input voltage VIL -0.3 V 15
High-level input current IIH 50 nA 15
Low-level input current IIL 50 nA 15

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-N4R2
  • Footprint: PCM_Espressif:ESP32-S2-SOLO
  • 3D model: 40-SMD Module (KiCad packages3D, STEP)
  • 3D model files: esp32-s2-solo-n4r2-etched.step / esp32-s2-solo-n4r2-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); esp32-s2-solo-n4r2.step / esp32-s2-solo-n4r2.glb are 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, 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