Mechanical Dimensions & Land Pattern (WLCSP-49(3.1x3.1))
Extracted from Datasheet & IPC-7351B NormalizedRecommended Companion BOM & Drop-In Equivalents
Passive external components per reference schematic and 1:1 pin-compatible alternatives| Designator / Replacement MPN | Value / Package | Function & PCB Layout Rule |
|---|---|---|
| N/A BOM | Per application circuit WLCSP-49(3.1x3.1) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — STM32L433CBY6TR (WLCSP-49(3.1x3.1))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of STM32L433CBY6TR (WLCSP-49(3.1x3.1))?
Manufactured by ST, the STM32L433CBY6TR is housed in a WLCSP-49(3.1x3.1) package with 49 pins and a 0.40 mm lead pitch, supporting a VCC supply range of 1.71 V to 3.6 V. Key pins include: A1 (PA1: Multiplexed I/O & Peripheral Pin PA1 (General)), A2 (PA2: Multiplexed I/O & Peripheral Pin PA2 (General)), A3 (PA3: Multiplexed I/O & Peripheral Pin PA3 (General)), A4 (PA4: Multiplexed I/O & Peripheral Pin PA4 (General)), A5 (PA5: Multiplexed I/O & Peripheral Pin PA5 (General)), A6 (PA6: Multiplexed I/O & Peripheral Pin PA6 (General)).
What are the IPC-7351B PCB Footprint dimensions for STM32L433CBY6TR?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), STM32L433CBY6TR (WLCSP-49(3.1x3.1)) has a nominal body envelope of 3.10 × 3.10 mm, pitch e = 0.40 mm, and 49 copper pads.
Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for STM32L433CBY6TR?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for STM32L433CBY6TR (ST, WLCSP-49(3.1x3.1)) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.
Static Reference Appendix: Pinout Table (49 pins) & STM32L433 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| A1 | PA1 | Digital_IO | Signal terminal PA1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA1. Supported peripheral buses: General. |
| A2 | PA2 | Digital_IO | Signal terminal PA2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA2. Supported peripheral buses: General. |
| A3 | PA3 | Digital_IO | Signal terminal PA3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA3. Supported peripheral buses: General. |
| A4 | PA4 | Digital_IO | Signal terminal PA4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA4. Supported peripheral buses: General. |
| A5 | PA5 | Digital_IO | Signal terminal PA5 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA5. Supported peripheral buses: General. |
| A6 | PA6 | Digital_IO | Signal terminal PA6 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA6. Supported peripheral buses: General. |
| A7 | PA7 | Digital_IO | Signal terminal PA7 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA7. Supported peripheral buses: General. |
| B1 | PB1 | Digital_IO | Signal terminal PB1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PB1. Supported peripheral buses: General. |
| B2 | PB2 | Digital_IO | Signal terminal PB2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PB2. Supported peripheral buses: General. |
| B3 | PB3 | Digital_IO | Signal terminal PB3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PB3. Supported peripheral buses: General. |
| B4 | PB4 | Digital_IO | Signal terminal PB4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PB4. Supported peripheral buses: General. |
| B5 | PB5 | Digital_IO | Signal terminal PB5 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PB5. Supported peripheral buses: General. |
| B6 | VBAT | Power_In | Primary positive power supply input (VBAT) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V). |
| B7 | PC13 | Digital_IO | Signal terminal PC13 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PC13. Supported peripheral buses: RTC/CLK. |
| C1 | PC1 | Digital_IO | Signal terminal PC1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC1. Supported peripheral buses: General. |
| C2 | PC2 | Digital_IO | Signal terminal PC2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC2. Supported peripheral buses: General. |
| C3 | PC3 | Digital_IO | Signal terminal PC3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC3. Supported peripheral buses: General. |
| C4 | PC4 | Digital_IO | Signal terminal PC4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC4. Supported peripheral buses: General. |
| C5 | PC5 | Digital_IO | Signal terminal PC5 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC5. Supported peripheral buses: General. |
| C6 | IOC6 | Digital_IO | General Purpose Digital I/O Pin IOC6 |
| C7 | PC14 - OSC32_ IN(PC14) | Digital_IO | Signal terminal PC14 - OSC32_ IN(PC14) (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PC14 - OSC32_ IN(PC14). Supported peripheral buses: RTC/CLK. |
| D1 | PD1 | Digital_IO | Signal terminal PD1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PD1. Supported peripheral buses: General. |
| D2 | PD2 | Digital_IO | Signal terminal PD2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PD2. Supported peripheral buses: General. |
| D3 | PD3 | Digital_IO | Signal terminal PD3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PD3. Supported peripheral buses: General. |
| D4 | PD4 | Digital_IO | Signal terminal PD4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PD4. Supported peripheral buses: General. |
| D5 | NRST | Digital_IO | Active-low hardware reset terminal (NRST): pulling this pin Low resets the processor core and peripherals. |
| D6 | PH1 - OSC_ OUT (PH1) | Digital_IO | Signal terminal PH1 - OSC_ OUT (PH1) (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PH1 - OSC_ OUT (PH1). Supported peripheral buses: RTC/CLK. |
| D7 | PH0 - OSC_ IN(PH0) | Digital_IO | Signal terminal PH0 - OSC_ IN(PH0) (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PH0 - OSC_ IN(PH0). Supported peripheral buses: RTC/CLK. |
| E1 | PE1 | Digital_IO | Signal terminal PE1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PE1. Supported peripheral buses: General. |
| E2 | PE2 | Digital_IO | Signal terminal PE2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PE2. Supported peripheral buses: General. |
| E3 | PE3 | Digital_IO | Signal terminal PE3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PE3. Supported peripheral buses: General. |
| E4 | PA3 | Digital_IO | Signal terminal PA3 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA3. Supported peripheral buses: UART, ADC, PWM. |
| E5 | PA2 | Digital_IO | Signal terminal PA2 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PA2. Supported peripheral buses: UART, ADC, PWM. |
| E6 | PC3 | Digital_IO | Signal terminal PC3 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI2_MOSI. Supported peripheral buses: SPI, I2C, ADC. |
| E7 | VSSA/ VREF - | GND | 0V electrical ground return terminal (VSSA/ VREF -) for internal core logic, I/O drivers, and analog sub-blocks. |
| F1 | PF1 | Digital_IO | Signal terminal PF1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PF1. Supported peripheral buses: General. |
| F2 | PF2 | Digital_IO | Signal terminal PF2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PF2. Supported peripheral buses: General. |
| F3 | PA7 | Digital_IO | Signal terminal PA7 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C3_SCL, SPI1_MOSI. Supported peripheral buses: SPI, I2C, ADC, PWM. |
| F4 | PA6 | Digital_IO | Signal terminal PA6 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_MISO. Supported peripheral buses: UART, SPI, ADC. |
| F5 | PA5 | Digital_IO | Signal terminal PA5 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: SPI1_SCK. Supported peripheral buses: SPI, ADC, DAC, PWM. |
| F6 | PA0 | Digital_IO | Signal terminal PA0 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PA0. Supported peripheral buses: UART, ADC, PWM, RTC/CLK. |
| F7 | VDDA/ VREF+ | Power_In | Primary positive power supply input (VDDA/ VREF+) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V). |
| G1 | PG1 | Digital_IO | Signal terminal PG1 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PG1. Supported peripheral buses: General. |
| G2 | PG2 | Digital_IO | Signal terminal PG2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PG2. Supported peripheral buses: General. |
| G3 | PB2 | Digital_IO | Signal terminal PB2 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C3_SMBA. Supported peripheral buses: I2C, RTC/CLK. |
| G4 | PB1 | Digital_IO | Signal terminal PB1 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PB1. Supported peripheral buses: UART, ADC, PWM. |
| G5 | PB0 | Digital_IO | Signal terminal PB0 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_NSS. Supported peripheral buses: UART, SPI, ADC, PWM. |
| G6 | PA4 | Digital_IO | Signal terminal PA4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: SPI1_NSS, SPI3_NSS. Supported peripheral buses: UART, SPI, ADC, DAC. |
| G7 | PA1 | Digital_IO | Signal terminal PA1 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SMBA, SPI1_SCK. Supported peripheral buses: UART, SPI, I2C, ADC, PWM. |












