STM32F103CBU6 is an STMicroelectronics Arm Cortex-M3 microcontroller with 128 KB Flash, 72 MHz, in UFQFPN-48 — the "Blue Pill" MCU core in a 7x7 mm ultra-thin QFN for space-constrained designs. The 0.55 mm profile is the selection point: full F103 performance where LQFP height or footprint will not fit. Selection advice: the U6 denotes UFQFPN-48 — confirm QFN assembly and inspection capability before committing; otherwise the LQFP CBT6 variant is easier to handle. Electrically identical to the LQFP CB parts, so firmware ports directly. ST lists this order code as active; we verify availability per lot. Parameters verified against the ST official product page.
Ordering-code highlights reviewed against official manufacturer documentation.
STM32F103CB is available in the following manufacturer order codes. They share the same STM32F103CB design; the table highlights package, packing and ordering differences. Quote the exact code your BOM needs.
| Order code | Package | Packing | Key difference |
|---|---|---|---|
| STM32F103CBT6 | LQFP-48 | — | — |
| STM32F103CBT6TR | LQFP 48 7x7x1.4 mm | — | Compared with STM32F103CBT6, package and listed temperature grade match, but the order-code suffix differs. Verify the factory packing and PCB footprint before treating order codes as interchangeable. |
| STM32F103CBT7 | LQFP 48 7x7x1.4 mm | — | Compared with STM32F103CBT6, temperature grade changes from -40.0 to 85.0 °C to -40.0 to 105.0 °C. Verify the factory packing and PCB footprint before treating order codes as interchangeable. |
| STM32F103CBT7TR | LQFP 48 7x7x1.4 mm | — | Compared with STM32F103CBT6, temperature grade changes from -40.0 to 85.0 °C to -40.0 to 105.0 °C. Verify the factory packing and PCB footprint before treating order codes as interchangeable. |
| STM32F103CBU6 | UFQFPN 48 7x7x0.55 mm | — | Compared with STM32F103CBT6, package changes from LQFP 48 7x7x1.4 mm to UFQFPN 48 7x7x0.55 mm. Verify the factory packing and PCB footprint before treating order codes as interchangeable. |
| STM32F103CBU6TR | UFQFPN 48 7x7x0.55 mm | — | Compared with STM32F103CBT6, package changes from LQFP 48 7x7x1.4 mm to UFQFPN 48 7x7x0.55 mm. Verify the factory packing and PCB footprint before treating order codes as interchangeable. |
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Browse existing catalog records — same series first, then the same category and manufacturer. These are not confirmed replacements; compatibility requires engineering review.
These are order-code variants of the same STMicroelectronics series. They share the core design; the ordering code selects the exact configuration — STM32F103CBT6 (LQFP-48); STM32F103CBT6TR: Compared with STM32F103CBT6, package and listed temperature grade match, but the order-code suffix differs. Verify the factory packing and PCB footprint before treating order codes as interchangeable.; STM32F103CBT7: Compared with STM32F103CBT6, temperature grade changes from -40.0 to 85.0 °C to -40.0 to 105.0 °C. Verify the factory packing and PCB footprint before treating order codes as interchangeable.. STM32F103CBU6 itself is the UFQFPN 48 7x7x0.55 mm configuration. A code that differs by even one character may be a different device, so always quote the complete code exactly as it appears on your BOM.
From the verified technical profile: Core: Arm Cortex-M3; Flash memory: 128 KB; CPU frequency: 72 MHz. These are the catalog-recorded values for STM32F103CBU6 — always re-check them against the manufacturer datasheet revision quoted on your BOM before finalizing the design.