JMB575 - SATA 6Gb/s 5-Port Multiplier Chip | JMicron
料号： JMB575 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.2 | $1,600.00 |
| 1,000 | $2.85 | $2,850.00 |
JMB575 概述
A SATA port multiplier is a storage bridging device that allows multiple SATA drives to share a single host SATA link using FIS-based switching defined by the SATA specification. Within the storage-IC hierarchy (interface controller -> SATA bridge -> storage controller), the JMB575 sits between one host SATA 6Gb/s port and up to five device ports, arbitrating traffic without host software changes.
Key features include 1-to-5-port Port Multiplier mode, 5-to-1-port Port Selector mode, SATA 6Gb/s (SATA III) line rates on all six serial channels, and fully embedded firmware - the chip boots from internal PROM and SRAM with no external flash required. An external flash interface is available for custom firmware when extended capability is needed.
Architecturally, the JMB575 combines six serial I/O macrocells with six SATA protocol engines and an on-chip microprocessor that runs JMicron's embedded firmware. Cascaded mode allows multiple JMB575 devices to be chained, connecting up to 15 drives to a single host port - useful in multi-bay enclosures where each cascade level shares the 6Gb/s host bandwidth.
Typical applications include multi-bay DAS (direct-attached storage) enclosures, NAS backplane expansion behind a 6-port SATA host controller such as ASMedia ASM1166, external USB-to-5x-SATA adapters (commonly paired with the JMS580 USB-to-SATA bridge), and industrial storage subsystems.
Design consideration: because all cascaded drives share one 6Gb/s host link, sustained aggregate throughput per drive decreases with cascade depth - plan bandwidth budgets accordingly and verify drive spin-up stagger settings for power sequencing in multi-bay products.
This page synthesizes distributor data, JMicron product documentation, and practical deployment notes (cascading, USB pairing) not found in the two-page product brief.
直接替换替代料： JMB575 ——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：
JMB572
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
JMB575 规格参数
| Product Type | SATA Port Multiplier / Port Selector Chip |
| Serial Channels | 6 independent SATA channels |
| 数据速率 | 6 Gb/s (SATA III / Gen 3) |
| Port Multiplier Mode | 1 to 5 ports |
| Port Selector Mode | 5 to 1 ports |
| Cascaded Mode | Up to 15 drives per host |
| Integrated Processor | Embedded microprocessor |
| On-chip Memory | SRAM and PROM |
| External Flash | Not required (optional external flash interface) |
| Firmware | Embedded (internal) |
| 封装 | QFN-64 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Supported Host Bridges | Paired with JMS580 (USB 3.x to SATA) in commercial adapters |
JMB575 qfn-64 引脚配置指南
JMB575（qfn-64 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： JMB575.
请参阅 数据手册 以查看完整引脚配置。
典型应用
JMB575 适用于 6 应用s: Multi-Bay DAS Enclosures, USB to 5x-SATA Adapter Cable, NAS Backplane Port Expansion, Drive Duplication and Imaging Stations, Industrial and Embedded Storage Subsystems, External RAID Enclosure Control.
Multi-Bay DAS Enclosures
The JMB575's 1-to-5-port SATA 6Gb/s port multiplier mode makes it the standard silicon for 4- and 5-bay direct-attached storage enclosures that expose a single eSATA or USB host link. Each drive bay connects to one of the chip's five device ports while the host link feeds the multiplier port, with the embedded firmware handling FIS-based switching transparently to the OS. Because all bays share the single 6Gb/s host link, a fully loaded enclosure divides roughly 6Gb/s (about 550 MB/s real-world) across active drives, which is adequate for home backup and media storage but not for simultaneous heavy transfers. Designers should implement drive spin-up staggering to limit inrush current when all bays power on simultaneously.
推荐
USB to 5x-SATA Adapter Cable
Consumer Type-C adapters commonly pair the JMB575 with the JMS580 USB-to-SATA bridge: the JMS580 converts one USB 3.x 5-10 Gbps link into a single SATA 6Gb/s link, which the JMB575 then multiplies to five SATA device connectors. The two-chip design requires no host-side port-multiplier awareness for basic enclosure use, and the JMB575's internal PROM firmware means no flash IC is needed on the tiny adapter PCB. Engineering trade-off: all five drives share the SATA link, so simultaneous multi-drive reads are slower than per-drive USB bridges; this is acceptable for backup and archival use. Power delivery for five 2.5-inch drives must come from an external DC input rather than bus power.
推荐
NAS Backplane Port Expansion
In entry-level NAS builds where the host board provides only one or two spare SATA ports, the JMB575 multiplies a single port to five drive backplane connectors, and cascaded mode reaches 15 drives per host link - as deployed on DIY NAS boards pairing an ASMedia ASM1166 host controller with JMB575 multipliers per bank. The chip's transparency to the host OS (the SATA port multiplier layer is handled by AHCI drivers) means no vendor driver is needed on Linux or Windows. Designers should verify host controller port-multiplier (PMP) support, since some AHCI implementations are limited to a single multiplier level, and should budget bandwidth per bay in RAID rebuild scenarios where multiple drives stream concurrently.
推荐
Drive Duplication and Imaging Stations
The 5-to-1-port Port Selector mode lets up to five host-side SATA connections time-share one target drive, which duplicator and forensic imaging equipment uses to route one shared drive among multiple controller channels without mechanical or relay switching. The JMicron embedded firmware arbitrates port selection, and the optional external flash interface allows OEM firmware customization for unit-specific imaging policies such as write-blocking on the source side. Because the selector guarantees that only the selected path is active, signal integrity matches a direct SATA connection at 6Gb/s. Stations requiring parallel one-to-many duplication should instead use the port multiplier direction with host-side software, or multiple dedicated bridge chips per target.
推荐
Industrial and Embedded Storage Subsystems
Industrial recorders, video surveillance appliances, and embedded data loggers often need several SATA drives behind a constrained set of host ports. The JMB575 expands one SATA 6Gb/s port into five, and with two cascade levels supports 15 drives from a single host connector, minimizing host controller count on space-limited carrier boards. The RoHS-compliant QFN-64 package reflows on standard SMT lines, and firmware stored in internal PROM eliminates BOM items that could suffer sourcing issues in long-life industrial builds. Engineers should confirm the commercial temperature rating against the product's environmental requirements, and provision the exposed pad for solid grounding to manage thermal dissipation in sealed fanless enclosures.
推荐
External RAID Enclosure Control
Consumer multi-bay RAID enclosures frequently cascade a JMS567-class USB bridge into one or three JMB575 port multipliers to reach 5 or 15 bays behind one upstream cable. The JMB575 presents each physical drive as an individual port multiplier port so host-side RAID software (Windows Storage Spaces, Linux md-raid, macOS HFS+ software RAID) manages the array while the chip remains protocol-transparent. Firmware backup is an important service consideration: community reports note that corruption of the embedded firmware can render cascaded bays inaccessible, so enclosure designers should expose the external flash interface in production for field recovery. Shared 6Gb/s bandwidth should be factored into RAID-level throughput expectations.
推荐
推荐产品汇总
工程参考数据： JMB575 ——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 | JMB572 |
|---|---|---|
| Package | QFN-64 | QFN-64 (verify per ordering code) |
| Brand | JMicron Technology | JMicron Technology |
| SATA Line Rate | 6 Gb/s (SATA III) | 6 Gb/s (SATA III) |
| Port Multiplier Configuration | 1 to 5 ports | 1 to 2 ports |
| Embedded Firmware / No External Flash | Yes (internal PROM/SRAM) | Yes (internal PROM/SRAM) |
关键差异点
- Five device ports from one host link in a single chip （对比 JMB572)
- Zero-flash BOM with embedded PROM firmware （对比 JMB572)
- Dual-mode silicon (multiplier + selector) （对比 Discrete switching solutions)
设计说明
As a QFN-64 part running six 6Gb/s serial channels, the JMB575 requires disciplined high-speed layout: keep each SATA differential pair at 100-ohm differential impedance with matched intra-pair lengths, and route pairs on a continuous reference ground plane without crossing plane splits. Solder the exposed pad to a solid ground pour with an array of thermal vias - this is both the main thermal path and the return-current path for the serial links. Place 0.1uF decoupling capacitors at each supply pin within 2 mm of the ball/pad location.
Estimated: with six SATA links active, aggregate power draw is dominated by the serial I/O; budget supply rails per JMicron's power tables in the full datasheet, which is not public in the retrieved brief. For a 5-bay enclosure, drive spin-up is the dominant inrush event - implement staggered spin-up (either firmware-controlled or via drive jumper/PMC) and size the 12V rail with margin, since five drives spinning up simultaneously can demand 10-20 A peak on 12V. Never power five 3.5-inch drives from USB bus power.
Verify host controller port-multiplier support before committing to a JMB575 cascade: many AHCI hosts support only one multiplier level (15-drive cascades then fail), and some USB-to-SATA bridges do not pass PMP commands at all - confirm the JMS580/JMS567 firmware version supports PMP passthrough. Back up firmware when using external flash; community reports document cascaded enclosures losing half their bays after firmware corruption. Also remember all drives share one 6Gb/s host link - do not spec per-drive performance above the shared-link budget.
合规信息
RoHS compliance stated on JLCPCB part listing for the QFN-64 packaged JMB575. REACH, halogen-free, and conflict-minerals declarations not published in retrieved data.
