Mechanical Dimensions & Land Pattern (STM-32(5x5))
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 STM-32(5x5) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — HMC871LC5TR (STM-32(5x5))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of HMC871LC5TR (STM-32(5x5))?
Manufactured by ADI, the HMC871LC5TR is housed in a STM-32(5x5) package with 33 pins and a 0.50 mm lead pitch, supporting a VCC supply range of 5V to 8V. Key pins include: 1 (NC: Multiplexed I/O & Peripheral Pin NC (General)), 2 (IO2: General Purpose Digital I/O Pin IO2), 3 (NC: Multiplexed I/O & Peripheral Pin NC (General)), 4 (NC: No Connect (Leave Floating)), 5 (IO2: GPIO2 / RTC_GPIO2 / TOUCH2 / ADC1_CH1), 6 (IO3: GPIO3 / RTC_GPIO3 / TOUCH3 / ADC1_CH2 (JTAG Source Strap)).
What are the IPC-7351B PCB Footprint dimensions for HMC871LC5TR?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), HMC871LC5TR (STM-32(5x5)) has a nominal body envelope of 5.00 × 5.00 mm, pitch e = 0.50 mm, and 33 copper pads plus a central exposed thermal pad (EPAD) of 3.50 × 3.50 mm with a 60% IPC-7525 windowed solder paste grid.
Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for HMC871LC5TR?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for HMC871LC5TR (ADI, STM-32(5x5)) 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 (33 pins) & HMC871 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 2 | IO2 | Digital_IO | General Purpose Digital I/O Pin IO2 |
| 3 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 4 | NC | No_Connect | No Connect (Leave Floating) |
| 5 | IO2 | Digital_IO | GPIO2 / RTC_GPIO2 / TOUCH2 / ADC1_CH1 |
| 6 | IO3 | Digital_IO | GPIO3 / RTC_GPIO3 / TOUCH3 / ADC1_CH2 (JTAG Source Strap) |
| 7 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 8 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 9 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 10 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 11 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 12 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 13 | IO15 | Digital_IO | GPIO15 / RTC_GPIO15 / U0RTS / ADC2_CH4 / XTAL_32K_P |
| 14 | IO16 | Digital_IO | GPIO16 / RTC_GPIO16 / U0CTS / ADC2_CH5 / XTAL_32K_N |
| 15 | IO17 | Digital_IO | GPIO17 / RTC_GPIO17 / U1TXD / ADC2_CH6 |
| 16 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 17 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 18 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 19 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 20 | IO9 | Digital_IO | GPIO9 / RTC_GPIO9 / TOUCH9 / ADC1_CH8 / FSPIHD |
| 21 | IO10 | Digital_IO | GPIO10 / RTC_GPIO10 / TOUCH10 / ADC1_CH9 / FSPICS0 |
| 22 | IO11 | Digital_IO | GPIO11 / RTC_GPIO11 / TOUCH11 / ADC2_CH0 / FSPID |
| 23 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 24 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 25 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 26 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 27 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 28 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 29 | NC | NC | Signal terminal NC (I/O, 5V to 8V domain). Multiplexed alternate functions: NC. Supported peripheral buses: General. |
| 30 | IO30 | Digital_IO | General Purpose Digital I/O Pin IO30 |
| 31 | IO31 | Digital_IO | General Purpose Digital I/O Pin IO31 |
| 32 | IO32 | Digital_IO | General Purpose Digital I/O Pin IO32 |
| 33 | EP | GND | Bottom exposed die attach pad (EP) providing primary thermal conduction path to the PCB and low-inductance 0V ground return. |





![HMC871LC5TR (STM-32(5x5)) — Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]](/api/v1/assets/C661791/extracted/figures/p07_fig01.png)


