Mechanical Dimensions & Land Pattern (QFN-48-EP(7x7))
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 QFN-48-EP(7x7) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — USB2503A-HZH (QFN-48-EP(7x7))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of USB2503A-HZH (QFN-48-EP(7x7))?
Manufactured by MICROCHIP, the USB2503A-HZH is housed in a QFN-48-EP(7x7) package with 49 pins and a 0.50 mm lead pitch. Key pins include: 1 (VDDA33: Power Supply Input (VDDA33 — 3.3V / 5.0V Standard Logic)), 2 (USBDP0: Multiplexed I/O & Peripheral Pin USBDP0 (USB)), 3 (COMPOUND: Multiplexed I/O & Peripheral Pin COMPOUND (General)), 4 (MTT_ENABLE: Multiplexed I/O & Peripheral Pin MTT_ENABLE (General)), 5 (HS_DISABLE: Multiplexed I/O & Peripheral Pin HS_DISABLE (General)), 6 (Reserved: Multiplexed I/O & Peripheral Pin Reserved (General)).
What are the IPC-7351B PCB Footprint dimensions for USB2503A-HZH?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), USB2503A-HZH (QFN-48-EP(7x7)) has a nominal body envelope of 7.00 × 7.00 mm, pitch e = 0.50 mm, and 49 copper pads plus a central exposed thermal pad (EPAD) of 5.30 × 5.30 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 USB2503A-HZH?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for USB2503A-HZH (MICROCHIP, QFN-48-EP(7x7)) 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) & USB2503 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | VDDA33 | Power_In | Primary positive power supply input (VDDA33) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 2 | USBDP0 | Digital_IO | Signal terminal USBDP0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: USBDP0. Supported peripheral buses: USB. |
| 3 | COMPOUND | Digital_IO | Signal terminal COMPOUND (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: COMPOUND. Supported peripheral buses: General. |
| 4 | MTT_ENABLE | Digital_IO | Signal terminal MTT_ENABLE (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: MTT_ENABLE. Supported peripheral buses: General. |
| 5 | HS_DISABLE | Digital_IO | Signal terminal HS_DISABLE (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: HS_DISABLE. Supported peripheral buses: General. |
| 6 | Reserved | Digital_IO | Signal terminal Reserved (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: Reserved. Supported peripheral buses: General. |
| 7 | VDDA33 | Power_In | Primary positive power supply input (VDDA33) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 8 | USBDP2 | Digital_IO | Signal terminal USBDP2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: USBDP2. Supported peripheral buses: USB. |
| 9 | USBDN2 | Digital_IO | Signal terminal USBDN2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: USBDN2. Supported peripheral buses: USB. |
| 10 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 11 | USBDN3 | Digital_IO | Signal terminal USBDN3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: USBDN3. Supported peripheral buses: USB. |
| 12 | USBDP3 | Digital_IO | Signal terminal USBDP3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: USBDP3. Supported peripheral buses: USB. |
| 13 | VDDA33 | Power_In | Primary positive power supply input (VDDA33) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 14 | PRTPWER3 | Digital_IO | Signal terminal PRTPWER3 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PRTPWER3. Supported peripheral buses: General. |
| 15 | OCS3_N | Digital_IO | Signal terminal OCS3_N (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: OCS3_N. Supported peripheral buses: General. |
| 16 | PRTPWR2 | Digital_IO | Signal terminal PRTPWR2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PRTPWR2. Supported peripheral buses: General. |
| 17 | GR3/PRT_DIS0 | Digital_IO | Signal terminal GR3/PRT_DIS0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: GR3/PRT_DIS0. Supported peripheral buses: General. |
| 18 | PRTPWR_POL | Digital_IO | Signal terminal PRTPWR_POL (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PRTPWR_POL. Supported peripheral buses: General. |
| 19 | GR2/NON_REM1 | Digital_IO | Signal terminal GR2/NON_REM1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: GR2/NON_REM1. Supported peripheral buses: General. |
| 20 | GANG_EN | Digital_IO | Signal terminal GANG_EN (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: GANG_EN. Supported peripheral buses: General. |
| 21 | GR1/NON_REM0 | Digital_IO | Signal terminal GR1/NON_REM0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: GR1/NON_REM0. Supported peripheral buses: General. |
| 22 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 23 | VDD18 | Power_In | Primary positive power supply input (VDD18) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 24 | TEST0 | Digital_IO | Signal terminal TEST0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: TEST0. Supported peripheral buses: General. |
| 25 | SDA/SMBDATA | Digital_IO | Signal terminal SDA/SMBDATA (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SDA/SMBDATA. Supported peripheral buses: I2C. |
| 26 | SCL/SMBCLK/CFG_SEL0 | Digital_IO | Signal terminal SCL/SMBCLK/CFG_SEL0 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SCL/SMBCLK/CFG_SEL0. Supported peripheral buses: I2C. |
| 27 | CFG_SEL1 | Digital_IO | Signal terminal CFG_SEL1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: CFG_SEL1. Supported peripheral buses: General. |
| 28 | SELF_PWR | Digital_IO | Signal terminal SELF_PWR (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SELF_PWR. Supported peripheral buses: General. |
| 29 | VBUS_DET | Power_In | Primary positive power supply input (VBUS_DET) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 30 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 31 | VDD18 | Power_In | Primary positive power supply input (VDD18) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 32 | OCS2_N | Digital_IO | Signal terminal OCS2_N (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: OCS2_N. Supported peripheral buses: General. |
| 33 | PRTPWR1 | Digital_IO | Signal terminal PRTPWR1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: PRTPWR1. Supported peripheral buses: General. |
| 34 | OCS1_N | Digital_IO | Signal terminal OCS1_N (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: OCS1_N. Supported peripheral buses: General. |
| 35 | CLKIN_EN | Digital_IO | Signal terminal CLKIN_EN (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: CLKIN_EN. Supported peripheral buses: General. |
| 36 | TEST1 | Digital_IO | Signal terminal TEST1 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: TEST1. Supported peripheral buses: General. |
| 37 | RESET_N | Digital_IO | Active-low hardware reset terminal (RESET_N): pulling this pin Low resets the processor core and peripherals. |
| 38 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 39 | VDD33CR | Power_In | Primary positive power supply input (VDD33CR) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 40 | VDD18 | Power_In | Primary positive power supply input (VDD18) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 41 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 42 | XTAL2 | Digital_IO | Signal terminal XTAL2 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: XTAL2. Supported peripheral buses: RTC/CLK. |
| 43 | XTAL1/CLKIN | Digital_IO | Signal terminal XTAL1/CLKIN (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: XTAL1/CLKIN. Supported peripheral buses: RTC/CLK. |
| 44 | VDDA18PLL | Power_In | Primary positive power supply input (VDDA18PLL) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 45 | VDDA33PLL | Power_In | Primary positive power supply input (VDDA33PLL) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 46 | ATEST/REG_EN | Digital_IO | Signal terminal ATEST/REG_EN (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: ATEST/REG_EN. Supported peripheral buses: General. |
| 47 | RBIAS | Digital_IO | Signal terminal RBIAS (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: RBIAS. Supported peripheral buses: General. |
| 48 | VSS | GND | 0V electrical ground return terminal (VSS) for internal core logic, I/O drivers, and analog sub-blocks. |
| 49 | EP | GND | Bottom exposed die attach pad (EP) providing primary thermal conduction path to the PCB and low-inductance 0V ground return. |





