# STM32F103T6U6 — documented alternatives

> The closest documented alternative to STM32F103T6U6 is GigaDevice GD32F103T6U6, graded P2P (pin- and software-compatible candidate, high confidence). Key difference to review first: Max clock 108MHz vs 72MHz. Every match is an engineering-review candidate, not an unqualified drop-in claim.

Canonical page: https://senneon.com/cross-reference/stm32f103t6u6
Data verified: 2026-07-13 · Grading methodology: https://senneon.com/verification

## Graded candidates

| Candidate | Brand | Grade | Confidence | Known differences | Evidence |
|---|---|---|---|---|---|
| GD32F103T6U6 | GigaDevice | P2P | high | Max clock 108MHz vs 72MHz; Flash is zero-wait SRAM-buffered — timing-sensitive code needs review vs ST; 1.2V core via internal LDO; analog peripheral (ADC) behavior differs, validate in-circuit | GigaDevice compatibility sum-up between GD32 and STM32 (V2.0) (checked 2026-07-13); Part-number suffix (pin count / density / package / temperature) matches ST exactly (checked 2026-07-13) |

## Parametric comparison (manufacturer-sourced)

| Spec | GD32F103T6U6 |
|---|---|
| Core | Cortex®-M3 |
| Speed (MHz) | 108 |
| Flash | 32K |
| SRAM | 10K |
| Package | QFN36 |
| Temp Range | 40℃~85℃ |

Commercial terms are quote-only; no price, stock or lead-time claims are published. RFQ: https://senneon.com/rfq?pn=STM32F103T6U6