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Contents

Pinout
Key specifications
Electrical characteristics
Materials and finish
CAD (KiCad official)
Provenance

README

markdown

ESP32-S3-WROOM-1U-N16R8

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

ESP32-S3-WROOM-1U-N16R8 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 connection for the module.
2	3V3	power_in	Module power supply input; Table 6-2 gives VDD33 as 3.0 V min, 3.3 V typ, 3.6 V max.
3	EN	input	High enables the chip and low powers it off; do not leave this pin floating.
4	IO4	bidirectional	GPIO4, also RTC_GPIO4, TOUCH4 and ADC1_CH3; DC limits are in Section 6.3.
5	IO5	bidirectional	GPIO5, also RTC_GPIO5, TOUCH5 and ADC1_CH4; DC limits are in Section 6.3.
6	IO6	bidirectional	GPIO6, also RTC_GPIO6, TOUCH6 and ADC1_CH5; DC limits are in Section 6.3.
7	IO7	bidirectional	GPIO7, also RTC_GPIO7, TOUCH7 and ADC1_CH6; DC limits are in Section 6.3.
8	IO15	bidirectional	GPIO15, also RTC_GPIO15, U0RTS, ADC2_CH4 and XTAL_32K_P; DC limits are in Section 6.3.
9	IO16	bidirectional	GPIO16, also RTC_GPIO16, U0CTS, ADC2_CH5 and XTAL_32K_N; DC limits are in Section 6.3.
10	IO17	bidirectional	GPIO17, also RTC_GPIO17, U1TXD and ADC2_CH6; DC limits are in Section 6.3.
11	IO18	bidirectional	GPIO18, also RTC_GPIO18, U1RXD, ADC2_CH7 and CLK_OUT3; DC limits are in Section 6.3.
12	IO8	bidirectional	GPIO8, also RTC_GPIO8, TOUCH8, ADC1_CH7 and SUBSPICS1; DC limits are in Section 6.3.
13	IO19	bidirectional	GPIO19, also RTC_GPIO19, U1RTS, ADC2_CH8, CLK_OUT2 and USB_D-; DC limits are in Section 6.3.
14	IO20	bidirectional	GPIO20, also RTC_GPIO20, U1CTS, ADC2_CH9, CLK_OUT1 and USB_D+; DC limits are in Section 6.3.
15	IO3	bidirectional	GPIO3, also RTC_GPIO3, TOUCH3 and ADC1_CH2; strapping pin for JTAG signal source (Section 4).
16	IO46	bidirectional	GPIO46; strapping pin for chip boot mode and ROM message printing, default weak pull-down (Section 4).
17	IO9	bidirectional	GPIO9, also RTC_GPIO9, TOUCH9, ADC1_CH8, FSPIHD and SUBSPIHD; DC limits are in Section 6.3.
18	IO10	bidirectional	GPIO10, also RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4 and SUBSPICS0; DC limits are in Section 6.3.
19	IO11	bidirectional	GPIO11, also RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5 and SUBSPID; DC limits are in Section 6.3.
20	IO12	bidirectional	GPIO12, also RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6 and SUBSPICLK; DC limits are in Section 6.3.
21	IO13	bidirectional	GPIO13, also RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7 and SUBSPIQ; DC limits are in Section 6.3.
22	IO14	bidirectional	GPIO14, also RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS and SUBSPIWP; DC limits are in Section 6.3.
23	IO21	bidirectional	GPIO21, also RTC_GPIO21; DC limits are in Section 6.3.
24	IO47	bidirectional	GPIO47, also SPICLK_P_DIFF and SUBSPICLK_P_DIFF; operates at 1.8 V only on R16V modules, not stated for R8 modules.
25	IO48	bidirectional	GPIO48, also SPICLK_N_DIFF and SUBSPICLK_N_DIFF; operates at 1.8 V only on R16V modules, not stated for R8 modules.
26	IO45	bidirectional	GPIO45; strapping pin for VDD_SPI voltage, default weak pull-down (Section 4).
27	IO0	bidirectional	GPIO0, also RTC_GPIO0; strapping pin for chip boot mode, default weak pull-up (Section 4).
28	IO35	bidirectional	SPIIO6, GPIO35, FSPID and SUBSPID; default function is set by eFuse bit, and the pin is unavailable for other uses on R8 or R16V modules with Octal SPI PSRAM.
29	IO36	bidirectional	SPIIO7, GPIO36, FSPICLK and SUBSPICLK; default function is set by eFuse bit, and the pin is unavailable for other uses on R8 or R16V modules with Octal SPI PSRAM.
30	IO37	bidirectional	SPIDQS, GPIO37, FSPIQ and SUBSPIQ; default function is set by eFuse bit, and the pin is unavailable for other uses on R8 or R16V modules with Octal SPI PSRAM.
31	IO38	bidirectional	GPIO38, FSPIWP and SUBSPIWP; DC limits are in Section 6.3.
32	IO39	bidirectional	MTCK, GPIO39, CLK_OUT3 and SUBSPICS1; DC limits are in Section 6.3.
33	IO40	bidirectional	MTDO, GPIO40 and CLK_OUT2; DC limits are in Section 6.3.
34	IO41	bidirectional	MTDI, GPIO41 and CLK_OUT1; DC limits are in Section 6.3.
35	IO42	bidirectional	MTMS and GPIO42; DC limits are in Section 6.3.
36	RXD0	bidirectional	U0RXD, GPIO44 and CLK_OUT2; DC limits are in Section 6.3.
37	TXD0	bidirectional	U0TXD, GPIO43 and CLK_OUT1; DC limits are in Section 6.3.
38	IO2	bidirectional	GPIO2, also RTC_GPIO2, TOUCH2 and ADC1_CH1; DC limits are in Section 6.3.
39	IO1	bidirectional	GPIO1, also RTC_GPIO1, TOUCH1 and ADC1_CH0; DC limits are in Section 6.3.
40	GND	power_in	Ground connection for the module.
41	EPAD	power_in	Ground exposed pad; soldering it to the base board ground is optional and improves thermal performance, applying the correct amount of paste.

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	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 (65 °C version)	TA	-40		65	°C	65 °C version	27
Low-level input voltage	VIL	-0.3			V		27
High-level input current	IIH			50	nA		27
Low-level input current	IIL			50	nA		27
Chip reset voltage	VIL_nRST	-0.3			V	EN voltage is within the specified range	28
Power supply voltage (3.3 V)	VCC	2.7	3.3	3.6	V		31
Maximum clock frequency	FC	80			MHz		31
Center frequency range of operating channel (Wi-Fi)		2412		2484	MHz		32
Center frequency range of operating channel (Bluetooth LE)		2402		2480	MHz		34
RF transmit power range (Bluetooth LE)		-24		20	dBm		34
TX EVM limit, 802.11b 1 Mbps				-10	dB	@20.5 dBm	32
TX EVM limit, 802.11b 11 Mbps				-10	dB	@20.5 dBm	32
TX EVM limit, 802.11g 6 Mbps				-5	dB	@20 dBm	32
TX EVM limit, 802.11g 54 Mbps				-25	dB	@18 dBm	32
TX EVM limit, 802.11n HT20 MCS 0				-5	dB	@19 dBm	33
TX EVM limit, 802.11n HT20 MCS 7				-27	dB	@17.5 dBm	33
TX EVM limit, 802.11n HT40 MCS 0				-5	dB	@18.5 dBm	33
TX EVM limit, 802.11n HT40 MCS 7				-27	dB	@17 dBm	33

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-N16R8
Footprint: PCM_Espressif:ESP32-S3-WROOM-1U
3D model: ESP32-S3-WROOM-1U (KiCad packages3D, STEP)
3D model files: esp32-s3-wroom-1u-n16r8-etched.step / esp32-s3-wroom-1u-n16r8-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); esp32-s3-wroom-1u-n16r8.step / esp32-s3-wroom-1u-n16r8.glb are the bare package body.

Provenance

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

Datasheet: Espressif Systems datasheet (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