Eight copper gigabit ports
Each JL2308 part provides 8 ports at a 1G data rate, with copper ports listed from 10BASE-T upward. The optical port is NA, so every port runs on twisted pair.
Ethernet Interface Chip products
JL2308 8 Port Gigabit Ethernet PHY
JL2308 provides eight gigabit ports aggregated to the host over QSGMII, in an LQFP128 package at 14 by 14 millimetres. Confirm the host offers QSGMII and enough bandwidth, then plan the layout for eight pairs and the serial lanes.
Part number search & selector
Find JL2308 8 Port Gigabit Ethernet PHY part numbers
Filter JL2308 parts by ports, data rate, MAC interface, temperature, package, size, interface voltage, copper and optical port and mode.
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| Image | Part number | Datasheet | Compare | Downloads | Series | Data Rate | Ports | MAC Interface | V（if） | Copper Port | Optical Port | Mode | Temperature | Package | Size | Sample |
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JL2308-PC | SPEC | JL2308 series | 1G | 8 | QSGMII | NA | 10 Bsae-T | NA | QSGMII-COP | 0~70℃ | LQFP128 | 20*14 mm |
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JL2308-PI | SPEC | JL2308 series | 1G | 8 | QSGMII | NA | 10 Bsae-T | NA | QSGMII-COP | -40~85℃ | LQFP128 | 20*14 mm |
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By series
Ethernet PHY series by speed and ports
Series are separated by link speed, port count and the MAC interface they present.
Series overview
JL2308 8-port Gigabit Ethernet PHY overview
The JL2308 8-port Gigabit Ethernet PHY is the copper front end for switches and routers whose SoC talks QSGMII, turning its host links into eight RJ45 gigabit ports. It also goes by octal gigabit PHY, QSGMII PHY or 8-port Ethernet PHY. Commercial and industrial grades come in a leaded LQFP128 package. The JL2388 series lists the same selector values, so compare their datasheets.
QSGMII toward the host
QSGMII carries four gigabit ports per serial link, so check in the JL2308 datasheet how the eight ports map onto host lanes and what reference clock the design needs.
PC or PI grade
JL2308-PC is rated 0 °C to 70 °C for office switches and recorders, while JL2308-PI covers −40 °C to +85 °C for industrial switches and roadside cabinets.
Package and assembly
It comes in an LQFP128 package (see the datasheet for body dimensions) with gull-wing leads, so solder joints can be inspected optically and reworked by hand. The selector lists no interface voltage, so take the supply rails from the datasheet too.
Applications
Where the JL2308 8-port Gigabit Ethernet PHY is used
It suits any board where a QSGMII host needs a bank of copper gigabit ports.
Unmanaged and managed switches
Desktop, rack and smart switches built on a switch SoC use one JL2308 per eight front-panel ports, with the switch handling forwarding and the PHY handling the cable.
DIN-rail and ring switches
Plant, utility and traffic switches in outdoor or unheated cabinets use JL2308-PI, whose −40 °C to +85 °C rating covers cold starts and summer heat.
NVRs and PoE switches
Network video recorders and PoE switches add eight camera ports behind a QSGMII host; PoE power comes from separate PSE controllers, not from the PHY.
Documents
JL2308 8-port Gigabit Ethernet PHY datasheets
Search for JL2308-PC or JL2308-PI to open the datasheet, then review QSGMII lane mapping, pinout and the LQFP128 drawing before layout.
Showing representative available file sets. Search to find a specific SKU.
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- PDF datasheets listed
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- 3D file sets listed
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- PCB footprints listed
VOOHU’s published product content is reviewed by its engineering team. Specifications, downloads and technical support information are tied to specific part numbers, so you can verify them before requesting samples or a quotation.
Sourcing
Sourcing the JL2308 8-port Gigabit Ethernet PHY
VOOHU is an authorized JLSemi distributor. Each part number has a PDF datasheet with the QSGMII details, pinout and LQFP128 drawing.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples for switch prototypes
Samples are available for evaluation, and selected parts are free of charge. Our FAE team will be glad to confirm the options for your project. When you request a quotation, give the part number, quantity per build and schedule, and we will confirm availability.
Moving from another octal PHY
Send the part number and datasheet of the 8-port PHY you use now. Our FAE team compares host interface, port mapping, grade and package, reviews register, driver and layout differences, and suggests candidates to validate with samples before production.
Quality and company
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies.
FAQ
JL2308 8-port Gigabit Ethernet PHY questions
Where to buy, fiber uplinks beside the PHY and which design files exist.
How does an eight port PHY connect to the host?
Over QSGMII, a serial interface that carries several links on one pair rather than running eight parallel interfaces. Your host controller must provide QSGMII and enough aggregate bandwidth for eight gigabit links. Confirm both before selecting an eight port device.
What does QSGMII demand from the layout?
Controlled impedance, length matching and a continuous reference plane under the serial lanes. It is a high speed serial link, so it is less forgiving than a parallel interface. Follow the datasheet layout guidance and verify link quality on a prototype board.
How does JL2308 compare with JL2388?
Both are eight port gigabit devices with QSGMII in an LQFP128 package at 14 by 14 millimetres and the same temperature grades. Feature level differences are defined by their respective datasheets, so send your requirement and our engineers will set out which differences apply.
What about magnetics for eight ports?
Each copper port needs its own magnetics, either discrete LAN transformers or RJ45 jacks with integrated magnetics. Plan the board area and the panel arrangement early, and follow the device reference circuit for the centre tap connection on each port.
How do I request samples or a quote?
With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the host controller, confirmation that it provides QSGMII, the port count and the temperature range.
Where can I buy the JL2308 8-port Gigabit Ethernet PHY?
From VOOHU, an authorized JLSemi distributor, with FAE help on the QSGMII connection and port layout. VOOHU also offers quad-port Gigabit Ethernet transformers for the line side.
How do I add a fiber uplink to a JL2308 design?
Not through the PHY itself, since its optical port is NA. Use a separate PHY on a spare host port, such as JL2201 with 1000BASE-X or JL4201 with 2500BASE-X, if your SoC offers the matching RGMII or SGMII interface.
Are 3D models or PCB footprints published for this PHY?
Not on this page; the published file for each part is a PDF datasheet. Build the LQFP128 footprint from the package drawing in the JL2308 datasheet and confirm lead pitch with your assembler.
Engineer support
JL2308 8-port Gigabit Ethernet PHY design support
Send the candidate part number and the condition you need reviewed. Sample support can be added after the selection is clear; commercial questions may be discussed in the same engineering conversation.
- 1Selected part numbers
- 2Engineering review
- 3Sample request
- 4Commercial discussion
For a replacement review
- Original part and datasheet
Include the document revision
- Operating conditions
Temperature, isolation voltage and PoE current basis
- Package constraints
Pin count, pitch and spacing between pin rows
- Project stage and annual volume
To help prioritize samples and evaluation
- Target review date
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
For samples and a quotation
- Candidate part numbers
From the selector or engineering review
- Quantity and project stage
Prototyping / pilot build / production
- Required delivery date
Specify sample and production timing separately
- Required documentation
Compliance documents, material declarations or third-party reports
Samples are free of charge. Sample quantity and lead time depend on the part number and project stage. Sales will respond on business days.
