ESP32 vs ESP32-S3 — Which Module Should You Source?

Espressif's ESP32 family powers millions of connected devices. With the ESP32-S3 gaining traction, procurement teams face a common question: stick with the proven ESP32-WROOM-32 or migrate to the S3?

ESP32-WROOM-32: The Proven Choice

The original ESP32 module remains the most cost-effective option for:

• Wi-Fi + Bluetooth 4.2 connectivity
• Dual-core 240MHz processing
• Mature Arduino and ESP-IDF support
• Widest third-party board compatibility

Best for: Cost-sensitive IoT products, retrofit projects, designs with existing ESP32 firmware.

ESP32-S3-WROOM-1: The Next Generation

The S3 adds meaningful upgrades:

• AI acceleration via vector instructions — critical for on-device ML
• USB-OTG native support — eliminates external USB-UART bridge chips
• BLE 5.0 with extended range
• More GPIO and improved peripheral set

Best for: New designs requiring edge AI, USB device functionality, or BLE 5.0 features.

Price and Availability Comparison

| Factor | ESP32-WROOM-32 | ESP32-S3-WROOM-1 | |--------|---------------|------------------| | Unit price (1K) | ~$3.10 | ~$4.25 | | Stock availability | Excellent | Good | | Lead time | Same day | 1-2 days | | Ecosystem maturity | Very high | Growing fast |

Migration Considerations

Switching from ESP32 to S3 is not a drop-in replacement. Plan for:

• Firmware porting to ESP-IDF 5.x
• PCB footprint differences (check module dimensions)
• Power supply requirements (S3 is slightly more power-hungry under load)

Recommendation

For existing products in production, stay on ESP32-WROOM-32 unless you need S3-specific features. For new designs starting in 2025, the ESP32-S3 offers better long-term positioning — especially for AI-enabled IoT products.