Ufs 3.1 Pinout High Quality
UFS 3.1 (Universal Flash Storage) standard, published by JEDEC as JESD220E, utilizes a high-speed serial interface designed to balance massive throughput with minimal power consumption. While standard storage like eMMC uses a parallel interface with many pins, UFS 3.1 employs a low pin-count serial interface
to simplify circuit board routing and reduce the physical footprint of mobile and automotive devices. KIOXIA America, Inc. UFS 3.1 Physical Interface & Pinout UFS 3.1 chips typically use a 153-ball BGA (Ball Grid Array)
package with an 11mm x 13mm profile. The pinout is organized around the MIPI M-PHY physical layer
, which uses differential signaling to achieve high data rates. KIOXIA America, Inc. Primary Signal Groups Differential Data Lanes (TX/RX):
UFS 3.1 supports up to two lanes for data transfer. Each lane consists of a differential pair: DIN_t / DIN_c: Data Input (Receive) pair from the host. DOUT_t / DOUT_c: Data Output (Transmit) pair to the host. Full Duplex
architecture allows the device to read and write data simultaneously, a major advantage over the half-duplex eMMC standard. Reference Clock (REF_CLK):
A critical pin providing the base frequency for the internal high-speed oscillators. It is recommended that this clock is stable before transitioning into high-speed modes. Hardware Reset (RST_n):
An active-low signal used by the host to perform a hardware-level reset of the UFS device. KIOXIA Corporation Power Supply Pins
To maintain high efficiency, UFS 3.1 utilizes multiple voltage rails: Main power supply for the NAND flash memory. Power supply for the controller and I/O interface.
A secondary, lower-voltage supply for the ultra-low-power physical layer (M-PHY). Key Features Enabled by the Pinout
The specialized pinout of UFS 3.1 supports several advanced power and performance features introduced in the 3.1 standard:
UFS 3.1 for Consumer & Industrial | KIOXIA - United States (English)
Universal Flash Storage (UFS) 3.1: Technical Architecture and Pinout Analysis
Universal Flash Storage (UFS) 3.1 is an advanced storage standard developed by the JEDEC Solid State Technology Association to meet the high-bandwidth and low-latency demands of 5G smartphones, automotive systems, and IoT devices. By utilizing the MIPI M-PHY physical layer and UniPro link layer, UFS 3.1 achieves sequential read speeds of approximately 2100 MB/s, representing a significant performance leap over older standards like eMMC. 1. Physical Interface: The BGA153 Footprint ufs 3.1 pinout
The standard physical package for UFS 3.1 is the 153-ball Fine-pitch Ball Grid Array (FBGA). While this 153-ball footprint is physically similar to the older eMMC BGA153, the internal pin assignments and electrical signaling are entirely different and incompatible. Samsung 512GB UFS 3.1 - Upgrade Guide & Performance 2026
(Universal Flash Storage) pinouts typically follow the JEDEC JESD220E specification, primarily using package layouts for mobile and embedded devices.
Unlike older eMMC storage that uses a 4-bit or 8-bit parallel bus, UFS 3.1 utilizes a high-speed serial interface
based on the MIPI M-PHY physical layer. This reduces the number of required signal pins while enabling full-duplex communication (simultaneous reading and writing). Kioxia Singapore Pte. Ltd. Critical Signal Groups
The UFS 3.1 interface is defined by a small set of high-performance differential signal pairs and power rails: eMMC vs UFS - Prodigy Technovations
You're looking for information on the pinout of UFS 3.1!
UFS 3.1 (Universal Flash Storage 3.1) is a high-speed storage interface standard designed for mobile devices, such as smartphones, tablets, and laptops. It provides faster data transfer rates, lower power consumption, and higher storage capacity compared to its predecessors.
The UFS 3.1 interface uses a MIPI (Mobile Industry Processor Interface) M-PHY physical layer, which is a high-speed, low-power interface standard. The UFS 3.1 pinout consists of:
UFS 3.1 Pinout:
- VDDQ (Power supply for UFS interface): 1.8V or 2.5V
- VDD (Power supply for UFS device): 2.7V to 3.6V
- GND (Ground)
- REFCLK (Reference clock): 26 MHz or 52 MHz
- RST_N (Reset): Active low
- DATA_LANE0_P (Data lane 0 positive)
- DATA_LANE0_N (Data lane 0 negative)
- DATA_LANE1_P (Data lane 1 positive)
- DATA_LANE1_N (Data lane 1 negative)
- DATA_LANE2_P (Data lane 2 positive)
- DATA_LANE2_N (Data lane 2 negative)
- DATA_LANE3_P (Data lane 3 positive)
- DATA_LANE3_N (Data lane 3 negative)
- CTRL_LANE_P (Control lane positive)
- CTRL_LANE_N (Control lane negative)
The UFS 3.1 interface supports multiple lanes, with each lane capable of operating at speeds of up to 2.9 Gbps (gigabits per second). The standard also supports multiple configurations, including:
- UFS 3.1 HS (High-Speed) mode: Up to 2.9 Gbps per lane
- UFS 3.1 LPM (Low-Power Mode): Low-power states for reduced power consumption
The UFS 3.1 pinout is designed to be compatible with a wide range of applications, including smartphones, tablets, laptops, and other mobile devices.
Do you have any specific questions about the UFS 3.1 pinout or its applications?
UFS 3.1 (Universal Flash Storage) is a high-speed, serial interface designed for mobile systems like smartphones and tablets. Unlike older parallel interfaces like eMMC, the UFS 3.1 pinout utilizes Low Voltage Differential Signaling (LVDS) to achieve high-performance full-duplex operation, allowing the device to read and write simultaneously. UFS 3.1 Pin Configuration Overview VDDQ (Power supply for UFS interface): 1
The most common physical package for UFS 3.1 is the 153-ball FBGA (Fine-pitch Ball Grid Array), measuring approximately 11.5mm x 13.0mm. The reduced pin count compared to eMMC simplifies PCB routing while enabling much higher bandwidth.
According to technical specifications from Arasan Chip Systems and Kingston , the pinout is categorized into high-speed data lanes, power supply lines, and control signals. High-Speed Differential Lanes (M-PHY)
UFS 3.1 relies on the MIPI M-PHY physical layer, which uses differential pairs for data transmission.
TX_P / TX_N (Transmit): Differential data lanes for sending information from the host to the storage device.
RX_P / RX_N (Receive): Differential data lanes for receiving data from the storage device to the host.
Lanes: 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
Maintaining stable power is critical for UFS 3.1 performance, especially with features like "Write Booster".
VCC: The main power supply for the NAND flash memory, typically ranging from 2.4V to 2.7V.
VCCQ: Power supply for the controller and I/O interface, typically 1.14V to 1.26V (nominal 1.2V).
GND / VSS: Ground pins used for power return and signal shielding. Clock and Control Signals
REF_CLK (Reference Clock): 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.
RST_N (Hardware Reset): A low-active signal used to hard-reset the UFS device. UFS 3.1 vs. eMMC Pinout
UFS 3.1 | Universal Flash Storage | Samsung Semiconductor Global The UFS 3
Bolstered by JEDEC standards, the UFS 3.1 offers high-performing storage with serious speed. It's thanks in part to Write Booster, samsung.com Samsung UFS Card
6. Visual Pinout Reference (Top View)
153-ball BGA – ball A1 at corner marking
A1 B1 C1 D1 E1 F1 G1 H1 J1 K1 L1 M1 N1
A2 B2 C2 D2 E2 F2 G2 H2 J2 K2 L2 M2 N2
A3 B3 C3 D3 E3 F3 G3 H3 J3 K3 L3 M3 N3
...
(Key signals placed as in table above)
Tip: Most designs use ball E3=F3 (RX/TX) for Lane 0. Lane 1 (if present) sits on J3/K3 – but UFS 3.1 often uses only single lane for power saving.
Conclusion: The Future – UFS 4.0 Pinout
As of 2025, UFS 4.0 is entering the mainstream. Its pinout is identical in ballmap to UFS 3.1 (153-ball BGA) but doubles the per-lane speed to 23.2 Gbps using M-PHY HS-G5.
For engineers today, mastering UFS 3.1 pinout means:
- Understanding differential pair integrity.
- Respecting power sequencing.
- Knowing that a “dead” UFS chip is often just a missing 1.2V rail or a floating reset line.
Whether you are repairing a bricked smartphone or designing a high-end ADAS system, the 153 balls of the UFS 3.1 package hold the keys to high-speed, reliable storage. Treat them with the respect that 11.6 Gbps demands.
Appendix: Quick Reference Checklist for PCB Layout
- [ ] All VCC balls connected to 3.3V rail with <50mV ripple.
- [ ] All VCCQ balls connected to 1.2V rail.
- [ ] 100nF AC coupling caps on DOUT_Tx lines (both lanes).
- [ ] Differential traces length matched (P to M) within 0.5mm.
- [ ] REF_CLK pair length matched and isolated from noisy lines.
- [ ] RST_N has external 10k pull-up to VCCQ.
- [ ] Thermal pad under chip soldered to PCB ground plane.
For specific ball coordinates (e.g., exact location of D2, M3), always refer to the latest JEDEC JESD220-3 standard or your component vendor's datasheet, as mask revisions may shift reserved pins.
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Scenario C: Low-Level Debug (JTAG over UFS? No)
UFS does not expose JTAG on standard pins. Debug requires:
- UniPro protocol analyzer (e.g., Teledyne LeCroy) capturing M-PHY lanes.
- Or vendor-specific test mode via a custom firmware.
4. Practical Applications of Knowing the Pinout
For hardware design: Route the differential pairs (RX/TX) with 50-ohm impedance matching and length matching within 5 mils. Keep REF_CLK away from switching regulators to avoid jitter.
For phone repair: If a water-damaged phone doesn't detect UFS, measure diode mode to ground on VCC, VCCQ, and REF_CLK. A short to ground on REF_CLK often indicates a cracked chip or solder bridge under the BGA.
For data recovery: Using a UFS adapter board (e.g., EasyJTAG, Medusa Pro), you need to map the pinout correctly. Misconnecting VCCQ (1.2V) to a 3.3V programmer port is a common cause of permanent chip death.
