Replacement Options for U1

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U1
Accessed Knowledge (2)

Determining replacement mode.

Finding pin-compatible ESP32 modules.

Utilizing the datasheet tool.

Clarifying replacement requirements.

Using Knowledge Base Tool.

Using BOM Tool.

Starting 3 component searches

Searching: "ESP32-WROOM-32E"

Searching: "ESP32-WROOM-32UE"

Searching: "ESP32-WROOM-32U"

Completed 3 component searches.

Looking for "module dimensions and footprint" in esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf

Looking for "pin definitions table" in esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf

Looking for "module dimensions mechanical drawing footprint land pattern" in esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf

Looking for "pin definitions table pin layout" in esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf

Looking for "footprint compatible with ESP32-WROOM-32D or ESP32-WROOM-32U" in esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf

Looking for "module dimensions and footprint land pattern" in esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf

Looking for "antenna keepout PCB design recommendations" in esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf

Crafting queries for replacements.

Here are safe, drop‑in replacements for U1 (ESP32‑WROOM‑32D). Per the ESP32‑WROOM‑32E/32UE datasheet: “ESP32‑WROOM‑32E / ESP32‑WROOM‑32UE modules use ‘Type 3’ footprints and can be replaced with ESP32‑WROOM‑D / ESP32‑WROOM‑U modules.” This confirms footprint/pin compatibility.
Replacement options for U1

Table

PartAntennaDrop‑in with ESP32‑WROOM‑32D?NotesDatasheet
ESP32‑WROOM‑32EOn‑module PCB traceYes (Type 3 footprint)Direct internal‑antenna successor to 32D; no schematic or footprint change needed.PDF
ESP32‑WROOM‑32UE‑N16External (u.FL)Yes (Type 3 footprint)For external/chip antenna designs; keep external antenna and keep‑out in mind.PDF
ESP32‑WROOM‑32UE‑N8External (u.FL)Yes (Type 3 footprint)Same as above with different flash variant.PDF
ESP32‑S3‑WROOM‑1‑N16R8On‑module PCB traceNoNewer MCU family; requires schematic and footprint changes.PDF
Notes
  • Compatibility source: ESP32‑WROOM‑32E/32UE datasheet states they can replace ESP32‑WROOM‑32D/32U on “Type 3” footprints.
  • If you want external antenna performance, choose a 32UE option; otherwise, 32E is the simplest drop‑in.
Which direction do you prefer: internal antenna (ESP32‑WROOM‑32E) or external antenna (ESP32‑WROOM‑32UE‑N16)?
Choose internal antenna
Switch to external antenna
Check current footprint
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Inspect

EcoCore Refboard

EcoCore Refboard
Description

Created
Last updated by terratronix
1 Contributor(s)
terratronix

Controls

Properties

System Architecture
```mermaid flowchart TD MCU["ESP32 MCU Domain"] PWR["Power/Protection Domain"] REL["Relay Control Domain"] PWM["PWM I/O Headers"] DHT["DHT22 Connectors"] I2C["I2C Expansion Header"] DBG["Programming/Test Pad Domain"] LED["Status LED Domain"] USB["USB Interface Domain"] PWR --> MCU MCU --> REL MCU --> PWM MCU --> DHT MCU --> I2C MCU --> DBG MCU --> LED MCU --> USB ```
Trace Widths
12V = 3 mm, 5V = 1 mm, 3V3 = 0.8 mm
Trace Width 5V
1 mm
USB-C Placement
Near ESP32, away from relay/12V zone
Net Class: Low Speed
EN, IO0, PWM1, PWM2, CC1, CC2, DHT1_DATA, DHT2_DATA
Zone A (Logic)
Contains U1, J8, U5, J6, J7, D7, R15, R16, USB test points TP_DP/TP_DN/TP_CC1/TP_CC2, TP_3V3, TP_5V, TP_GND, D4–D6, and associated passives
Trace Width 3V3
0.8 mm
Board Dimensions
40.0 mm × 25.0 mm
Net Class: Medium Speed
TX0, RX0
Silkscreen Intent
Clear outlines and labels for USB-C receptacle, CC, D+/D– test pads
Mechanical Features
Four non-plated 3.0 mm holes (TP_DP, TP_DN, TP_CC1, TP_CC2 groups) used as combined mounting and USB probe access
Stackup
Standard 4 Layer: Top (signal), Layer 2 (ground plane), Layer 3 (power pours), Bottom (signal)
Mounting Approach
USB-C and BOOT/RESET header near ESP32, keep clearance from relay/12V zone; use existing 3.0 mm non-plated holes (TP_DP/TP_DN/TP_CC1/TP_CC2) as mechanical and probe access features
Mounting Holes
Four non-plated 3.0 mm holes (TP_DP, TP_DN, TP_CC1, TP_CC2) used as mechanical mounting and USB probe access features
Zone B (Power/Relays)
Contains F1, D1–D3, D8–D9, U2, U3, U4, J1–J3, J4–J5, TP_12V, bulk/decoupling capacitors C1–C4, and relay status LEDs and resistors
Net Class: High Speed
D+, D-
Trace Width 12V
3 mm
Net Class: Ground
GND

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