UFS 3.1 typically supports a 2-lane configuration (2 TX and 2 RX pairs), doubling the bandwidth compared to single-lane setups. Power Supply Pins
UFS 3.1 supports up to two lanes. Lane 0 is mandatory; Lane 1 is optional but required for maximum performance.
The pinout of UFS 3.1 is the manifestation of a sophisticated and powerful data storage standard. For the engineer working on a new smartphone, the technician diagnosing a dead phone, or the hobbyist working on an embedded Linux project, this knowledge is not just abstract theory; it's practical, hands-on information that drives successful design and repair. The architecture is a testament to the engineering effort required to make our devices faster, more power-efficient, and more reliable.
For hardware engineers, data recovery specialists, and mobile forensics experts, understanding the is critical for diagnostics, device programming, and chip-off data extraction. 1. What is UFS 3.1? ufs 3.1 pinout
UFS 3.1 is backward compatible with UFS 2.1 pinouts, but VCCQ2 (1.2V for advanced low-power states) is more common. Missing VCCQ2 may prevent HS-G4 (Gear 4) speeds.
UFS 3.1 is defined by the . It builds on the MIPI M‑PHY and UniPro protocols to deliver exceptional performance: up to HS‑Gear 4 × 2 lanes, offering raw data rates of approximately 1.6 GB/s and actual sequential read speeds reaching 2,150 MB/s in real‑world products.
For forensics or repair, you cannot simply solder wires to the BGA. You need an or a direct-launch PCB . The pinout of UFS 3
UFS utilizes MIPI M-PHY physical layer technology. Data is transmitted via differential pairs (Positive and Negative signals) to minimize electromagnetic interference (EMI) and maintain signal integrity at gigabit speeds. UFS 3.1 supports up to two downstream (Rx) lanes and two upstream (Tx) lanes.
This article explores the entire ecosystem surrounding the UFS 3.1 pinout—from the architectural philosophy that dictates its design to the practical realities of board layout, system integration, and even professional data recovery. We will break down the critical signals, the power supply subtleties that distinguish generations, the precise guidelines for high-speed PCB routing, and the essential backwards compatibility that makes UFS 3.1 a cornerstone of modern storage.
| Pin(s) | Symbol | Description | Importance | | :--- | :--- | :--- | :--- | | A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4 | | NAND Core Supply – 2.5V to 3.6V (typically 3.3V). Supplies power to the NAND flash array. High current draw during writes. | Critical | | D1, D2, D3, E1, E2, E3, F1, F2, F3, G1, G2, G3, G4 | VCCQ | Controller & I/O Supply – 1.14V to 1.26V (typically 1.2V) or 1.8V. Powers the UFS controller core and M-PHY. | Critical | | A1, K4, L4, M4, N1, N2, N3, N4, N5, N6, N7... | VSS | Ground. All VSS balls must be connected to a solid ground plane. | Critical | | H4, J4 | VCCQ2 | Optional second I/O supply for legacy compatibility. Usually tied to VCCQ. | Low | On a logic analyzer
⚠️ : UFS 3.1 uses M-PHY 4.1 (Gear 4) and UniPro 1.8 . While the pinout is physically compatible with UFS 2.x, high-speed signals (Rx/Tx) require stricter PCB layout. Always verify with the specific component datasheet (e.g., Samsung, Kioxia, Micron, SK Hynix).
Provides the base frequency for the M-PHY. Modern UFS 3.1 devices like those from Samsung Semiconductor require a precise reference clock to transition into high-speed modes.
Data Output True (t) and Complement (c). These are the transmitting (Tx) lines from the UFS device to the host processor. B. Power Supplies
Part number prefix examples:
Input differential pair from the host to the device. On a logic analyzer, these show as high-speed eye diagrams (difficult to probe without proper equipment). A short between these two pins is a common soldering defect.