NVT4857UK - SD 3.0 SDR104 Level Translator | NXP Semiconductors
料号： NVT4857UK ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
NVT4857UK 概述
A memory card level translator is an interface IC that bridges signal-voltage incompatibilities between a host processor SDIO controller and removable SD/microSD cards. When a host operates its SDIO pins at 1.2 V to 1.8 V while a card signals at 1.8 V or 3.0 V, direct connection violates voltage-tolerance limits. The level translator sits in the signal path, translating logic levels in both directions without software direction control, and sits at the top of a hierarchy that includes bus switches, voltage translators, and interface ICs within power-and-signal management semiconductors.
Key features include SD 3.0 specification compliance for SDR104, SDR50, DDR50, SDR25 and SDR12 modes plus SD 2.0 High-Speed (50 MHz) and Default-Speed (25 MHz) modes; a 1.2 V to 1.8 V host-side interface range; an integrated 100 mA low-dropout regulator that supplies the card-side I/O rails; and a feedback clock channel (CLK_FB) for clock synchronization.
Technically, the auto-direction control derives transfer direction from the SD command/data structure, so no DIR pin or firmware intervention is needed. Push-pull output stages deliver low power consumption compared with open-drain architectures. The device also integrates built-in EMI filters on the SD data lines and robust ESD protection rated to IEC 61000-4-2 level 4, reducing external component count on densely routed memory card interfaces. An auto-enable/disable function connected to the VSD supply pin powers the translator down when no card is present.
Typical applications include SDHC interfaces on networking processors such as the NXP LX2160A, embedded SD card slots on Xilinx Zynq UltraScale+ MPSoC evaluation platforms (ZCU670, VCK190), and industrial data loggers requiring SDR104-class throughput.
Design consideration: if the CLK_FB pin is left unconnected, SDR50 and DDR50 modes lose clock synchronization support and the design should constrain itself to SDR104, SDR25 and SDR12 timing, per NXP community guidance.
This page synthesizes distributor availability data, lifecycle notices, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： NVT4857UK ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
NVT4857UKAZ
✅ 直接替换📋 参考替代料（不在目录中）
NVT4857UK 规格参数
| Product Type | SD 3.0 dual-voltage level translator with auto-direction control |
| Maximum Clock Rate | 208 MHz |
| Host-Side Interface Voltage | 1.2 V to 1.8 V |
| Card-Side Signal Levels | 1.8 V or 3.0 V |
| Integrated LDO Output Current | 100 mA |
| Supported SD Modes | SDR104, SDR50, DDR50, SDR25, SDR12, High-Speed (50 MHz), Default-Speed (25 MHz) |
| Direction Control | Automatic (integrated) |
| Clock Synchronization | CLK_FB feedback channel |
| ESD Protection | IEC 61000-4-2 level 4 |
| EMI Filtering | Integrated on SD data lines |
| Card Detect | Auto enable/disable via VSD supply pin |
| 封装 | 20-ball WLCSP (VFBGA), 2.1 mm x 1.7 mm |
| Number of Terminals | 20 |
| Terminal Form | Ball |
| 安装类型 | Surface Mount |
| Temperature Grade | Industrial |
NVT4857UK 20-ball wlcsp (vfbga), 2.1 mm x 1.7 mm 引脚配置指南
NVT4857UK（20-ball wlcsp (vfbga), 2.1 mm x 1.7 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： NVT4857UK.
请参阅 数据手册 以查看完整引脚配置。
典型应用
NVT4857UK 适用于 6 应用s: Networking Processor SDHC Interface, Zynq UltraScale+ MPSoC Evaluation Platforms, Automotive Infotainment and Telematics SD Slots, Industrial Data Loggers and HMI Storage, Embedded Linux Single-Board Computers, Medical Portable Diagnostic Instruments.
Networking Processor SDHC Interface
The NVT4857UK is the recommended SDHC signal-voltage translator in the NXP LX2160A hardware design checklist, making Layer-7 networking platforms its flagship use case. The LX2160A SDIO controller operates at 1.2 V to 1.8 V while removable SD cards signal at 1.8 V or 3.0 V; the NVT4857UK bridges both domains with auto-direction control requiring no firmware overhead. Its 208 MHz maximum clock sustains SDR104-class boot and logging throughput of over 100 MB/s in UHS-I cards. The integrated 100 mA LDO powers the card-side I/O rail directly from the host supply, eliminating an external regulator, while IEC 61000-4-2 level 4 ESD protection and integrated EMI filters protect the exposed SD socket lines. The 2.1 mm x 1.7 mm WLCSP fits the dense routing typically found near ARM core package fanout.
推荐
Zynq UltraScale+ MPSoC Evaluation Platforms
Xilinx ZCU670 and VCK190 evaluation boards use the NXP NVT4857UK for SD card voltage translation ahead of the Zynq UltraScale+ MPSoC, as documented in Xilinx board user guides (UG1532 for ZCU670). The MPSoC SDIO controller runs at low-voltage host levels, and the translator enables full SD 3.0 mode coverage including SDR104 at up to 208 MHz for Linux root-filesystem and data capture workloads. The device's auto-direction control matches the bidirectional SD command/data bus without a host-managed direction pin, and the CLK_FB feedback channel supports SDR50 and DDR50 clock synchronization. Engineering discussion on Reddit and iWave forums confirms the part's role here and documents the TXS0206AYFPR as a functional, though not pin-compatible, substitute requiring discrete component adjustments.
推荐
Automotive Infotainment and Telematics SD Slots
The NVT4857UKAZ, the automotive-qualified variant of the same die and 20-ball WLCSP footprint, targets SD card slots in infotainment head units, telematics control units, and navigation systems where maps and media load from removable cards. Automotive SD sockets face harsh electrical environments: card insertion transients, load dump coupling, and IEC 61000-4-2 level 4 class human-body ESD events at the user-accessible slot. The NVT4857UKAZ addresses these with integrated ESD protection and EMI filtering, while the 100 mA integrated LDO supplies card-side I/O rails cleanly. Because the AZ variant shares the exact footprint and pin map of the NVT4857UK, infotainment platforms can dual-source both variants on one PCB layout and qualify once, reducing respin risk while the base part is under discontinuation notification 202606031DNU01.
推荐
Industrial Data Loggers and HMI Storage
Industrial data loggers, PLC HMI panels, and edge gateways use removable SD cards for local storage of process data, and the NVT4857UK fits these designs with its industrial temperature grade. A 1.2 V to 1.8 V host controller can drive both legacy 3.0 V SD cards and modern 1.8 V UHS-I cards without redesign, since the translator supports all SD modes from Default-Speed 25 MHz through SDR104 at 208 MHz. The integrated 100 mA LDO removes a discrete regulator from the card socket area, and push-pull outputs reduce power consumption in always-on logging nodes. The auto-enable/disable function tied to VSD powers down the interface when no card is inserted, saving energy in battery-backed logger deployments. IEC 61000-4-2 level 4 ESD tolerance withstands routine card swaps by maintenance personnel.
推荐
Embedded Linux Single-Board Computers
Embedded Linux SBCs and SOMs (system-on-modules) frequently expose microSD as the primary boot and storage medium, with host SoC SDIO controllers running at 1.8 V or lower. The NVT4857UK provides transparent level translation so a single board design can accept both 1.8 V UHS-I microSD cards (SDR104 at 208 MHz for fast boot and container loading) and legacy 3.0 V cards in Default-Speed mode. Its 2.1 mm x 1.7 mm WLCSP fits between the SoC and the socket connector on dense carrier boards, and integrated EMI filtering improves signal integrity on the 30-ohm-controlled-impedance SDIO traces typical of SDR104 layouts. The CLK_FB feedback channel maintains clock synchronization for SDR50 and DDR50 modes where the SoC supports tuned sampling, and the integrated LDO simplifies power tree design around the socket.
推荐
Medical Portable Diagnostic Instruments
Portable medical diagnostic instruments such as patient monitors, portable ultrasound, and point-of-care analyzers export records to SD cards for compliance archiving, and the NVT4857UK suits these hosts. Its low-voltage 1.2 V to 1.8 V host-side interface pairs with modern low-power SoCs, while supporting 1.8 V and 3.0 V card signaling means one socket accepts hospital-standard legacy cards and current UHS-I media up to SDR104 speeds for large image datasets. The industrial temperature grade and IEC 61000-4-2 level 4 ESD protection withstand clinical handling and frequent card exchange between devices. The integrated EMI filters help meet electromagnetic compatibility requirements for medical electrical equipment without discrete filter networks at the socket, and the auto-disable function via VSD reduces internal rail loading when the card slot is empty, beneficial for battery-operated portable operation.
推荐
推荐产品汇总
工程参考数据： NVT4857UK ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | NVT4857UKAZ |
|---|---|---|
| Package | 20-ball WLCSP (2.1 mm x 1.7 mm) | 20-ball WLCSP (2.1 mm x 1.7 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Max Clock Rate | 208 MHz | 208 MHz |
| Host-Side Voltage | 1.2 V to 1.8 V | 1.2 V to 1.8 V |
| Card-Side Voltage | 1.8 V or 3.0 V | 1.8 V or 3.0 V |
| Integrated LDO | Yes, 100 mA | Yes, 100 mA |
| SD 3.0 SDR104 Support | Yes | Yes |
| Automotive Qualification | No (industrial grade) | Yes (AZ automotive grade) |
关键差异点
- True drop-in availability via the AZ variant （对比 NVT4857UKAZ)
- Integrated card-side power and protection （对比 TXS0206AYFPR)
- Highest SD clock headroom in class （对比 TXS0206AYFPR)
设计说明
For SDR104 operation at 208 MHz, keep SDIO trace lengths from the NVT4857UK to the host and card socket matched within 5 mm and use series damping resistors (22 to 33 ohm) per the host reference design. The integrated EMI filters on the data lines add bandwidth limitation - verify eye diagrams at 208 MHz with your stackup, since long stubs to test points can close the eye. The CLK_FB feedback channel must be length-tuned to the clock path if SDR50 or DDR50 modes are required.
Do not assume the NXP PCN's suggested replacement is drop-in: discontinuation notification 202606031DNU01 explicitly states the successor is functionally similar but NOT package and pin-out compatible. If CLK_FB is left unconnected (acceptable per NXP Community guidance for LX2160A designs), restrict firmware to modes not requiring clock synchronization - SDR104, SDR25, SDR12 - because SDR50 and DDR50 lose tuning capability. Plan EOL strategy now; last-time-buy windows close without notice in distributor systems.
The integrated 100 mA LDO supplies the card-side I/O rail, so size the upstream supply for translator consumption plus up to 100 mA of card current. Connect the VSD sense pin to the card supply node so the auto-enable/disable function correctly gates the translator when the socket is empty - floating VSD can leave the device enabled and increase quiescent drain. Estimated: at 3.3 V input and full 100 mA card load, upstream dissipation budget should assume at least the card load plus LDO dropout margin per the datasheet electrical characteristics.
合规信息
Compliance data was not present in the verified web data; consult the official NXP product page for NVT4857UK. The NVT4857UKAZ variant is an automotive-grade (AZ) part. ESD immunity cited in the datasheet is IEC 61000-4-2 level 4, which is an interface robustness rating, not a materials compliance claim.
