While searching Aliexpress, I stumbled upon the RP2350 Tiny and Tiny XL, both of which are RP2350-based low-cost stamp-size development boards that look exactly like the Solder Party’s “RP2350 Stamp” modules, but are available at nearly half the price.
Both modules feature the Raspberry Pi RP2350 dual-core Arm Cortex-M33 microcontroller and an integrated LiPo charging circuitry. The RP2350 Tiny offers 30x GPIOs, while the larger RP2350 Tiny XL breaks out 48x GPIOs, adds PSRAM, and includes SWD/UART JST connectors. Key interfaces include USB host/device, UART, SPI, I²C, PWM, ADC, and PIO state machines, along with Secure Boot and Arm TrustZone. These features make this board suitable for rapid prototyping and testing with CircuitPython support.
RP2350 Tiny and Tiny XL specifications:
- Microcontroller
- RP2350 Tiny – Raspberry Pi RP2350A MCU, QFN-60; 7×7 mm
- RP2350 Tiny XL – Raspberry Pi RP2350B MCU,QFN-80; 10×10 mm
- Memory – 520KB internal RAM, 8KB OTP storage
- Storage – 16MB onboard flash; XL adds an extra PSRAM
- I/O
- RP2350 Tiny – 30x GPIOs via 40x through and castellated holes
- RP2350 TinyXL – 48x GPIOs via 60x through and castellated holes
- Up to 2x UART, 2x SPI, 2x I²C
- Up to 16x PWM (Tiny) / 24x PWM (TinyXL)
- Up to 4x ADC (Tiny) / 8x ADC (Tiny XL)
- 12x PIO state machines, HSTX peripheral
- USB host and device, SWD for debugging
- 5V, 3.3V, VBAT, and GND pins
- Security – Secure Boot, ARM TrustZone
- Miscellaneous
- Reset and Boot buttons, 12MHz crystal
- Tiny XL adds JST connectors for SWD and UART (Pi Debug Probe compatible)
- Pad under PCB disables the onboard battery LED
- Power Supply
- Input voltage – 5V via pin
- 500mA 3.3V LDO regulator
- LiPo battery input (VBAT) with charging circuit and LED indicator
- Dimensions
- RP2350 Tiny – 25.4 x 25.4 mm
- RP2350 Tiny XL – 44.5 x 25.4 mm
The company doesn’t mention the exact dimensions, but from the images placed on the measuring mat, the modules look almost identical in size to the Solder Party RP2350 Stamp and Stamp XL. Therefore, it’s safe to assume they share the same footprint and should work just fine with the RP2xxx Stamp Carrier XL, which was originally designed for the Stamp modules.
In terms of software support, the module should work with Arduino, MicroPython, and CircuitPython, just like any other Raspberry Pi RP2350-based board.
The Tiny and Tiny XL low-cost RP2350 boards are available on AliExpress, where the RP2350A Tiny costs $6.35 and the large RP2350B Tiny XL goes for $10.30.
Debashis Das is a technical content writer and embedded engineer with over five years of experience in the industry. With expertise in Embedded C, PCB Design, and SEO optimization, he effectively blends difficult technical topics with clear communication
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