component
ESP32-C3-WROOM-02U-N4
Public Made by Adomby adom
Espressif Systems WiFi Modules, SMD-19P. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownESP32-C3-WROOM-02U-N4
Espressif Systems · WiFi Modules · SMD-19P
ESP32-C3-WROOM-02U-N4 from Espressif Systems, in a SMD-19P. 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 | 3V3 | power_in | Module power supply pin; the datasheet gives no voltage limit for this pin in the pin definition table. |
| 2 | EN | input | Chip enable: high turns the chip on, low powers the chip off, and the pin must not be left floating. |
| 3 | IO4 | bidirectional | GPIO4, also available as ADC1_CH4, FSPIHD and MTMS. |
| 4 | IO5 | bidirectional | GPIO5, also available as ADC2_CH0, FSPIWP and MTDI. |
| 5 | IO6 | bidirectional | GPIO6, also available as FSPICLK and MTCK. |
| 6 | IO7 | bidirectional | GPIO7, also available as FSPID and MTDO. |
| 7 | IO8 | bidirectional | GPIO8, a strapping pin that sets chip boot mode and ROM message printing; it is floating by default. |
| 8 | IO9 | bidirectional | GPIO9, a strapping pin that sets chip boot mode; it has a weak pull-up by default (bit value 1). |
| 9 | GND | power_in | Ground pin of the module. |
| 10 | IO10 | bidirectional | GPIO10, also available as FSPICS0. |
| 11 | RXD | bidirectional | GPIO20, also used as U0RXD (UART0 receive) for firmware download and log output. |
| 12 | TXD | bidirectional | GPIO21, also used as U0TXD (UART0 transmit) for firmware download and log output. |
| 13 | IO18 | bidirectional | GPIO18, also used as USB_D- for the USB Serial/JTAG controller. |
| 14 | IO19 | bidirectional | GPIO19, also used as USB_D+ for the USB Serial/JTAG controller. |
| 15 | IO3 | bidirectional | GPIO3, also available as ADC1_CH3. |
| 16 | IO2 | bidirectional | GPIO2, also available as ADC1_CH2 and FSPIQ, and it is a strapping pin for chip boot mode that is floating by default. |
| 17 | IO1 | bidirectional | GPIO1, also available as ADC1_CH1 and XTAL_32K_N. |
| 18 | IO0 | bidirectional | GPIO0, also available as ADC1_CH0 and XTAL_32K_P. |
| 19 | GND | power_in | Ground pin, which is the exposed pad (EPAD); soldering it to the base-board ground is optional and improves thermal performance when done with the correct amount of paste. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Espressif Systems |
| Package | SMD-19P |
| Category | IoT/Communication Modules |
| Pins | 19 |
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 | 22 | ||
| Storage temperature | TSTORE | -40 | 105 | °C | 22 | ||
| Power supply voltage | VDD33 | 3 | 3.3 | 3.6 | V | 22 | |
| Current delivered by external power supply | IVDD | 0.5 | A | 22 | |||
| Operating ambient temperature | TA | -40 | 85 | °C | 85 °C version | 22 | |
| Low-level input voltage | VIL | -0.3 | V | 22 | |||
| Chip reset voltage (CHIP_EN voltage is within the specified range) | VIL_nRST | -0.3 | V | 23 | |||
| High-level input current | IIH | 50 | nA | 22 | |||
| Low-level input current | IIL | 50 | nA | 22 | |||
| Power supply voltage (1.8 V) | VCC | 1.65 | 1.8 | 2 | V | 24 | |
| Power supply voltage (3.3 V) | VCC | 2.7 | 3.3 | 3.6 | V | 24 | |
| Maximum clock frequency | FC | 80 | MHz | 24 | |||
| Program/erase cycles | 100000 | cycles | 24 | ||||
| Data retention time | TRET | 20 | years | 24 | |||
| Page program time | TPP | 0.8 | 5 | ms | 24 | ||
| Sector erase time (4 KB) | TSE | 70 | 500 | ms | 24 | ||
| Block erase time (32 KB) | TBE1 | 0.2 | 2 | s | 24 | ||
| Block erase time (64 KB) | TBE2 | 0.3 | 3 | s | 24 | ||
| Chip erase time (32 Mb) | TCE | 20 | 60 | s | 24 | ||
| Pin capacitance | CIN | 2 | pF | 22 | |||
| High-level source current | IOH | 40 | mA | VDD = 3.3 V, VOH >= 2.64 V, PAD_DRIVER = 3 | 22 | ||
| Low-level sink current | IOL | 28 | mA | VDD = 3.3 V, VOL = 0.495 V, PAD_DRIVER = 3 | 22 | ||
| Internal weak pull-up resistor | RPU | 45 | kΩ | 22 | |||
| Internal weak pull-down resistor | RPD | 45 | kΩ | 22 |
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) | 40 |
CAD (KiCad official)
- Symbol:
ESP32-C3-WROOM-02U-N4 - Footprint:
PCM_Espressif:ESP32-C3-WROOM-02U - 3D model: SMD-19P (KiCad packages3D, STEP)
- 3D model files:
esp32-c3-wroom-02u-n4-etched.step/esp32-c3-wroom-02u-n4-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);esp32-c3-wroom-02u-n4.step/esp32-c3-wroom-02u-n4.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Espressif Systems datasheet (47 pp, sha256
2375b1be75ebbfcf, 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).