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STM32L031G4U6TR (UFQFPN-28(4x4)) — Symbol, Footprint IPC-7351B & 3D STEP Model

STM32L031G4U6TR

STID: C2054448UFQFPN-28(4x4) · 28 Pins · Pitch 0.50mmIPC-7351B Verified5.0 (0)
SYNCHRONIZED 4D CROSS-PROBE MODETouch or hover any pin to highlight concurrently across Symbol, Footprint and 3D
1. SYMBOL
U1 · STM32L031G4U6TR (UFQFPN-28(4x4))1VDD2PC14 - OSC323PC15 - OSC324NRST5VDDA6PA0CK IN -_7PA18PA29PA310PA411PA512PA613PA714PB028VSS27BOOT026PB725PB624PB323PA1522PA1421PA1320PA1019PA918PA817VDD16VSS15PB1Grid Pitch = 2.54mm (IEEE-315)-17.8-12.7-7.6-2.52.57.612.717.822.917.812.77.62.5-2.5-7.6-12.7-17.8-22.9mm
2. 2D FOOTPRINT
27262524232019181716131211109654322817814152221E=4.00mm · Pitch e=0.50mmD=4.00mm-4-3-2-10123443210-1-2-3-4mm
3. 3D CAD MODEL
Package Body: 4.00mm × 4.00mm · Pitch: 0.50mm · Ruler Step: 1.00mmSynced <100ms

Synchronized Pinout (Symbol / 2D / 3D) (28/28)

Touch or hover any pin to highlight concurrently across Symbol, Footprint and 3D
PinSymbolTypeFunction (EN)
1VDDPowerPower Supply Input (VDD — 3.3V VDD (Max 4.0V))
2PC14 - OSC32_INI/OMultiplexed I/O & Peripheral Pin PC14 - OSC32_IN (RTC/CLK)
3PC15 - OSC32_OU TI/OMultiplexed I/O & Peripheral Pin PC15 - OSC32_OU T (RTC/CLK)
4NRSTISystem Enable & Hardware Reset (NRST)
5VDDAPowerPower Supply Input (VDDA — 3.3V VDD (Max 4.0V))
6PA0CK IN -_I/OMultiplexed I/O & Peripheral Pin PA0CK IN -_ (UART, ADC, PWM, RTC/CLK)
7PA1I/OMultiplexed I/O & Peripheral Pin PA1 (UART, I2C, ADC, PWM)
8PA2I/OMultiplexed I/O & Peripheral Pin PA2 (UART, ADC, PWM, RTC/CLK)
9PA3I/OMultiplexed I/O & Peripheral Pin PA3 (UART, ADC, PWM)
10PA4I/OMultiplexed I/O & Peripheral Pin PA4 (UART, SPI, ADC)
11PA5I/OMultiplexed I/O & Peripheral Pin PA5 (SPI, ADC, PWM)
12PA6I/OMultiplexed I/O & Peripheral Pin PA6 (UART, SPI, ADC)
13PA7I/OMultiplexed I/O & Peripheral Pin PA7 (UART, SPI, ADC)
14PB0I/OMultiplexed I/O & Peripheral Pin PB0 (UART, SPI, ADC, PWM)
15PB1I/OMultiplexed I/O & Peripheral Pin PB1 (UART, SPI, ADC, PWM)
16VSSGNDGround Reference Pin (VSS)
17VDDPowerPower Supply Input (VDD — 3.3V VDD (Max 4.0V))
18PA8I/OMultiplexed I/O & Peripheral Pin PA8 (UART, PWM, RTC/CLK)
19PA9I/OMultiplexed I/O & Peripheral Pin PA9 (UART, I2C, RTC/CLK)
20PA10I/OMultiplexed I/O & Peripheral Pin PA10 (UART, I2C)
21PA13I/OMultiplexed I/O & Peripheral Pin PA13 (SWD/JTAG)
22PA14I/OMultiplexed I/O & Peripheral Pin PA14 (UART, I2C, SWD/JTAG)
23PA15I/OMultiplexed I/O & Peripheral Pin PA15 (UART, SPI, PWM)
24PB3I/OMultiplexed I/O & Peripheral Pin PB3 (SPI, PWM)
25PB6I/OMultiplexed I/O & Peripheral Pin PB6 (UART, I2C)
26PB7I/OMultiplexed I/O & Peripheral Pin PB7 (UART, I2C)
27BOOT0IInput-Only Pin BOOT0 (General)
28VSSGNDGround Reference Pin (VSS)
PIN 1 VDD
Power
Power Supply Input (VDD — 3.3V VDD (Max 4.0V))
Design note: Primary positive power supply input (VDD) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V).
IPC-7351B Solder Density & Span C/G/Z Tuner

Live Embedded Datasheet PDF & Technical Drawing Gallery (6 Standard Drawings + 18 Extracted Figures)

Read the original datasheet PDF directly or click any drawing to view fullscreen
Open PDF in New Window ↗Read Datasheet PDF (.pdf)
PDF VIEWEROfficial Datasheet Document: STM32L031G4U6TR (ST · UFQFPN-28(4x4))
Scroll, search text (Ctrl+F), or expand directly inside the embedded PDF reader below
1. Realistic 3D PackageREPRESENTATIVE
STM32L031G4U6TR (UFQFPN-28(4x4)) - 1. Realistic 3D Package
Detailed solid 3D bodyExpand ›
2. Standard Pinout (Top View)CLEANROOM PINOUT
STM32L031G4U6TR (UFQFPN-28(4x4)) - 2. Standard Pinout (Top View)
True package pinout (28 pins)Expand ›
3. Original Datasheet PinoutPDF PINOUT
STM32L031G4U6TR (UFQFPN-28(4x4)) - 3. Original Datasheet Pinout
Uncropped datasheet pin diagramExpand ›
4. Package Dimensions (D×E×A)PACKAGE DIMENSIONS
STM32L031G4U6TR (UFQFPN-28(4x4)) - 4. Package Dimensions (D×E×A)
UFQFPN-28(4x4) · 4.00×4.00mm · Pitch 0.50mmExpand ›
5. Recommended Land PatternLAND PATTERN
STM32L031G4U6TR (UFQFPN-28(4x4)) - 5. Recommended Land Pattern
IPC-7351B Footprint (28 Pads)Expand ›
6. Application SchematicSCHEMATIC
STM32L031G4U6TR (UFQFPN-28(4x4)) - 6. Application Schematic
Typical Application SchematicExpand ›
Original Datasheet Pinouts & Technical Drawings (18 figures · Page 1/2)
Showing 1–12 of 18 uncropped original figures for STM32L031
P1 · p01_fig01EXACT PACKAGE
STM32L031G4U6TR (UFQFPN-28(4x4)) — • 5x peripherals communication interface
• 5x peripherals communication interface
P36 · p36_fig01EXACT PACKAGE
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 6. STM32L031x4/6 UFQFPN32 pinout
Figure 6. STM32L031x4/6 UFQFPN32 pinout
P36 · p36_fig02EXACT PACKAGE
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 7. STM32L031x4/6 UFQFPN28 pinout
Figure 7. STM32L031x4/6 UFQFPN28 pinout
P37 · p37_fig01EXACT PACKAGE
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 8. STM32L031 UFQFPN28 pinout
Figure 8. STM32L031 UFQFPN28 pinout
P110 · p110_fig01EXACT PACKAGE
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 47. UFQFPN28 recommended footprint
Figure 47. UFQFPN28 recommended footprint
P36 · p36_fig02P36
STM32L031G4U6TR (UFQFPN-28(4x4)) — Datasheet Page 36 (p36_fig02)
Datasheet Page 36 (p36_fig02)
P37 · p37_fig021553×790px
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 9. STM32L031x4/6 TSSOP20 pinout
Figure 9. STM32L031x4/6 TSSOP20 pinout
P49 · p49_fig011751×1352px
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 13. Power supply scheme
Figure 13. Power supply scheme
P49 · p49_fig021546×611px
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 14. Current consumption measurement scheme
Figure 14. Current consumption measurement scheme
P49 · p49_fig01P49
STM32L031G4U6TR (UFQFPN-28(4x4)) — Datasheet Page 49 (p49_fig01)
Datasheet Page 49 (p49_fig01)
P85 · p85_fig011546×551px
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 28. Recommended NRST pin protection
Figure 28. Recommended NRST pin protection
P88 · p88_fig011751×902px
STM32L031G4U6TR (UFQFPN-28(4x4)) — Figure 29. ADC accuracy characteristics
Figure 29. ADC accuracy characteristics
Page 1 / 2 (18 extracted figures)

Technical Specifications & Part Details (STM32L031G4U6TR)

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet (EN)
Embedded Microcontroller Unit (MCU)
Detailed Overview:STM32L031G4U6TR (UFQFPN-28(4x4)) is a 28-pin embedded microcontroller unit (mcu) featuring a 4.00 × 4.00 × 0.55 mm mechanical envelope (lead pitch e = 0.50 mm). Rated for 1.65 V to 3.6 V supply operation across -40°C ~ +85°C (Industrial Grade) with integrated UART, SPI, I2C, ADC, IrDA, PWM, RTC/CLK, SWD/JTAG interfaces.
Operating Supply VoltageV_CC / V_DD
1.65 V to 3.6 V
Place 100nF + 10µF X7R decoupling capacitors < 2mm from supply pins
Ambient Operating TemperatureT_A
-40°C ~ +85°C (Industrial Grade)
Industrial temperature grade; T_J(max) = +125°C
Clock / RF Operating Frequencyf_CLK / f_RF
32 kHz
Extracted from authoritative PDF specification tables
Current & Power RatingI_OUT / I_CC
I_GPIO(max) = ±20 mA / pin | I_VDD(total) ≤ 150 mA
15 5V-tolerant (FT) pins detected
Package Envelope (D × E × A)D × E × A
4.00 × 4.00 × 0.55 mm (A1=0.05 mm)
Package family: QFN (UFQFPN-28(4x4))
Pin Count & Lead PitchN / e
28 Pins | Pitch e = 0.50 mm (19.7 mil)
Normalized to Center-to-Center Span C per IPC-7351B
Integrated Peripheral InterfacesBuses
UART, SPI, I2C, ADC, IrDA, PWM, RTC/CLK, SWD/JTAG
Cross-linked with 4D Pinout & Schematic Symbol
Reflow & Moisture SensitivityIPC / MSL
IPC-7351B Level B | J-STD-020 (Peak 260°C) | MSL-3
60% windowed solder paste stencil on thermal EPAD
Engineering Safety Alert: Boot Strapping Pin Alert (BOOT0): Do not force conflicting external pull-ups/pull-downs during POR reset.
Engineering Safety Alert: Connect exposed thermal pad (if present) to internal ground plane via 0.3mm stitched thermal vias.

5-Point Standards Verification

Automated compliance checks prior to export
5/5 PASS
IEEE-315 Symbol28 auto-grouped pins
OK
IPC-7351B Land Pattern28 pads · Pitch 0.50mm
OK
IPC-7525 60% Solder PasteReflow 1:1 Standard
OK
DFM Rules JLCPCB / PCBWayMin pad clearance: 0.25mm
OK
3D STEP AP214 & GLBAligned coordinate origin (0,0,0)
OK

Hardware Verification & Community Engineering Reviews

Summary of electrical parameters, mechanical dimensions, voltage range and peripheral interfaces from Datasheet
5.00 PCB Verified

Mechanical Dimensions & Land Pattern (UFQFPN-28(4x4))

Extracted from Datasheet & IPC-7351B Normalized
mm
Package Body (D × E)Nominal
4.00 × 4.00 mm
Height (A) & Pitch (e)IPC-7351B
A=0.55mm · e=0.50mm
Pad Size (W × L)Level B
0.30 × 0.55 mm
Pins / Total PadsTopology
28P / 28Pad (QUAD_ROW)

Recommended Companion BOM & Drop-In Equivalents

Passive external components per reference schematic and 1:1 pin-compatible alternatives
DFM READY
Designator / Replacement MPNValue / PackageFunction & PCB Layout Rule
N/A
BOM
Per application circuit
UFQFPN-28(4x4)
Size power & signal trace widths for rated load current following IPC-2221 clearance rules.

Technical Frequently Asked Questions (FAQ) — STM32L031G4U6TR (UFQFPN-28(4x4))

Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formats
IPC-7351B / IEEE-315

What is the Pinout and operating voltage specification of STM32L031G4U6TR (UFQFPN-28(4x4))?

Manufactured by ST, the STM32L031G4U6TR is housed in a UFQFPN-28(4x4) package with 28 pins and a 0.50 mm lead pitch, supporting a VCC supply range of 1.65 V to 3.6 V. Key pins include: 1 (VDD: Power Supply Input (VDD — 3.3V VDD (Max 4.0V))), 2 (PC14 - OSC32_IN: Multiplexed I/O & Peripheral Pin PC14 - OSC32_IN (RTC/CLK)), 3 (PC15 - OSC32_OU T: Multiplexed I/O & Peripheral Pin PC15 - OSC32_OU T (RTC/CLK)), 4 (NRST: System Enable & Hardware Reset (NRST)), 5 (VDDA: Power Supply Input (VDDA — 3.3V VDD (Max 4.0V))), 6 (PA0CK IN -_: Multiplexed I/O & Peripheral Pin PA0CK IN -_ (UART, ADC, PWM, RTC/CLK)).

What are the IPC-7351B PCB Footprint dimensions for STM32L031G4U6TR?

Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), STM32L031G4U6TR (UFQFPN-28(4x4)) has a nominal body envelope of 4.00 × 4.00 mm, pitch e = 0.50 mm, and 28 copper pads.

Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for STM32L031G4U6TR?

You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for STM32L031G4U6TR (ST, UFQFPN-28(4x4)) 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 (28 pins) & STM32L031 Family VariantsExpand static table
Pin #Signal NameElectrical TypeFunctional Description & Design Notes
1VDDPower_InPrimary positive power supply input (VDD) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V).
2PC14 - OSC32_INDigital_IOSignal terminal PC14 - OSC32_IN (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC14 - OSC32_IN. Supported peripheral buses: RTC/CLK.
3PC15 - OSC32_OU TDigital_IOSignal terminal PC15 - OSC32_OU T (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PC15 - OSC32_OU T. Supported peripheral buses: RTC/CLK.
4NRSTDigital_IOActive-low hardware reset terminal (NRST): pulling this pin Low resets the processor core and peripherals.
5VDDAPower_InPrimary positive power supply input (VDDA) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V).
6PA0CK IN -_Digital_IOSignal terminal PA0CK IN -_ (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA0CK IN -_. Supported peripheral buses: UART, ADC, PWM, RTC/CLK.
7PA1Digital_IOSignal terminal PA1 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SMBA. Supported peripheral buses: UART, I2C, ADC, PWM.
8PA2Digital_IOSignal terminal PA2 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: PA2. Supported peripheral buses: UART, ADC, PWM, RTC/CLK.
9PA3Digital_IOSignal terminal PA3 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PA3. Supported peripheral buses: UART, ADC, PWM.
10PA4Digital_IOSignal terminal PA4 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: SPI1_NSS. Supported peripheral buses: UART, SPI, ADC.
11PA5Digital_IOSignal terminal PA5 (I/O, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: SPI1_SCK. Supported peripheral buses: SPI, ADC, PWM.
12PA6Digital_IOSignal terminal PA6 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_MISO. Supported peripheral buses: UART, SPI, ADC.
13PA7Digital_IOSignal terminal PA7 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_MOSI. Supported peripheral buses: UART, SPI, ADC.
14PB0Digital_IOSignal terminal PB0 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_MISO. Supported peripheral buses: UART, SPI, ADC, PWM.
15PB1Digital_IOSignal terminal PB1 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_MOSI. Supported peripheral buses: UART, SPI, ADC, PWM.
16VSSGND0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks.
17VDDPower_InPrimary positive power supply input (VDD) operating in the 3.3V VDD (Max 4.0V) domain (Max rating: 4.0V).
18PA8Digital_IOSignal terminal PA8 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PA8. Supported peripheral buses: UART, PWM, RTC/CLK.
19PA9Digital_IOSignal terminal PA9 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SCL. Supported peripheral buses: UART, I2C, RTC/CLK.
20PA10Digital_IOSignal terminal PA10 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SDA. Supported peripheral buses: UART, I2C.
21PA13Digital_IOSignal terminal PA13 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: PA13. Supported peripheral buses: SWD/JTAG.
22PA14Digital_IOSignal terminal PA14 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SMBA. Supported peripheral buses: UART, I2C, SWD/JTAG.
23PA15Digital_IOSignal terminal PA15 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_NSS. Supported peripheral buses: UART, SPI, PWM.
24PB3Digital_IOSignal terminal PB3 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: SPI1_SCK. Supported peripheral buses: SPI, PWM.
25PB6Digital_IOSignal terminal PB6 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SCL. Supported peripheral buses: UART, I2C.
26PB7Digital_IOSignal terminal PB7 (I/O, 3.3V VDD (5V-Tolerant FT) domain). Multiplexed alternate functions: I2C1_SDA. Supported peripheral buses: UART, I2C.
27BOOT0Digital_IOSignal terminal BOOT0 (I, 3.3V VDD (Max 4.0V) domain). Multiplexed alternate functions: BOOT0. Supported peripheral buses: General.
28VSSGND0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks.
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