RGMII host, copper line side
Every JL2101 part runs at 1G with RGMII toward the MAC and a twisted-pair copper port listed from 10BASE-T upward. The optical port is NA, so a fiber link needs a different Ethernet chip.
Ethernet Interface Chip products
JL2101 Gigabit Ethernet PHY
JL2101 is a single port gigabit PHY with an RGMII MAC interface in a QFN40 package, 5 by 5 millimetres. It is a copper only device covering three temperature grades. RGMII timing is sensitive, so follow the reference layout closely.
Part number search & selector
Find JL2101 Gigabit Ethernet PHY part numbers
Filter JL2101 parts by data rate, ports, MAC interface, interface voltage, copper and optical port, mode, temperature, package and size.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
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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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JL2101C-NC | SPEC | JL2101 series | 1G | 1 | RGMII | 1.8V | 10 Bsae-T | NA | RGMII-COP | 0~70℃ | QFN40 | 5*5 mm |
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JL2101C-NI | SPEC | JL2101 series | 1G | 1 | RGMII | 1.8V | 10 Bsae-T | NA | RGMII-COP | -40~85℃ | QFN40 | 5*5 mm |
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JL2101C-NE | SPEC | JL2101 series | 1G | 1 | RGMII | 1.8V | 10 Bsae-T | NA | RGMII-COP | -40~105℃ | QFN40 | 5*5 mm |
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JL2101DC-NC | SPEC | JL2101 series | 1G | 1 | RGMII | 1.8V | 10 Bsae-T | NA | RGMII-COP | 0~70℃ | QFN40 | 5*5 mm |
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JL2101DC-NI | SPEC | JL2101 series | 1G | 1 | RGMII | 1.8V | 10 Bsae-T | NA | RGMII-COP | -40~85℃ | QFN40 | 5*5 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
Selecting a JL2101 Gigabit Ethernet PHY
The JL2101 Gigabit Ethernet PHY sits between the RGMII MAC of a processor or network SoC and the magnetics of a copper RJ45 port. Engineers also look for it as an RGMII PHY, a 10/100/1000 Ethernet PHY or a single-port gigabit Ethernet transceiver. The selector lists C and DC versions with commercial, industrial and extended temperature grades, all in QFN40. For a fiber port, see the JL2201 series with 1000BASE-X; for faster uplinks, the JL4201 2.5G series.
C and DC versions
Part numbers come in a C version, such as JL2101C-NI, and a DC version, such as JL2101DC-NI. Rate, interface, voltage and package match in the selector, so ask our FAE team which one to design in.
Temperature by suffix
The suffix sets the grade: JL2101C-NC and JL2101DC-NC cover 0 °C to 70 °C, JL2101C-NI and JL2101DC-NI cover −40 °C to +85 °C, and JL2101C-NE alone reaches −40 °C to +105 °C. Size it to the board’s own temperature.
QFN40 at 5 × 5 mm
All parts use QFN40 at 5 × 5 mm, which keeps the Ethernet transceiver close to the RJ45 jack on dense boards. Route the RGMII group with matched lengths and take the reference circuit and land pattern from the datasheet.
Applications
Where the JL2101 Gigabit Ethernet PHY is used
The JL2101 fits any processor with RGMII that needs one copper gigabit port.
Processor and SoC boards
Single-board computers, embedded Linux modules and edge gateways take gigabit Ethernet from the processor’s RGMII port. JL2101C-NC or JL2101DC-NC covers indoor products rated 0 °C to 70 °C.
PLCs, HMIs and vision cameras
Controllers, operator panels and machine vision cameras need an industrial Ethernet PHY. JL2101C-NI and JL2101DC-NI are rated −40 °C to +85 °C; JL2101C-NE suits hot spots near motor drives.
Routers, gateways and recorders
Routers, IoT gateways and network video recorders add a WAN or management port with a single-port Ethernet transceiver beside the main SoC or switch.
Documents
JL2101 Gigabit Ethernet PHY datasheets
Search by part number, such as JL2101C-NI, to open the JL2101 datasheet and check RGMII delay settings, pin assignment and the QFN40 outline before layout.
Showing representative available file sets. Search to find a specific SKU.
JL2101C-NCJL2101 series
JL2101C-NIJL2101 series
JL2101C-NEJL2101 series
JL2101DC-NCJL2101 series
JL2101DC-NIJL2101 series
- 5
- PDF datasheets listed
- 0
- 3D file sets listed
- 0
- 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 JL2101 Gigabit Ethernet PHY from VOOHU
VOOHU is an authorized JLSemi distributor for the JL2101 parts above. Each part number has a PDF datasheet with the pinout, RGMII timing and QFN40 drawing.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples and volume quotes
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. For a quotation, give the part number, annual quantity and production start, and we will confirm availability.
Replacing another RGMII PHY
If your board uses a different gigabit PHY, send its part number and datasheet. Our FAE team compares RGMII delay options, temperature range and package, reviews register and layout differences with you, and suggests JL2101 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. PHY and port questions go to one FAE team.
FAQ
JL2101 Gigabit Ethernet PHY: buying and design questions
Quoting the JL2101 with magnetics, host I/O voltage and the files you can download.
What does JL2101 connect to?
A host controller providing RGMII. RGMII is a reduced pin count gigabit interface that uses double data rate signalling, which makes clock and data timing critical. Confirm both the interface and the delay mode your controller expects before selecting the device.
Does JL2101 support fibre?
No. It is a copper only device supporting 10Base-T through gigabit on twisted pair. If your design needs a fibre uplink at gigabit speed, compare the JL2201 series, which supports 1000Base-X, or send the requirement to our engineers.
What should I watch in the RGMII layout?
Clock to data timing. RGMII requires a defined delay between the clock and data lines, provided either by trace length or by the device's internal delay configuration. Getting this wrong produces an unstable link that may pass at room temperature and fail hot.
Which temperature grades are available?
Three: 0 to 70, minus 40 to 85, and minus 40 to 105 degrees, identified by the NC, NI and NE suffixes. The series also lists more than one silicon revision, so confirm both the revision and the grade on the complete part number.
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, its RGMII delay configuration and the operating temperature range.
Can VOOHU quote the JL2101 Gigabit Ethernet PHY together with its magnetics?
Yes. VOOHU distributes JLSemi PHY chips and also offers Gigabit Ethernet transformers and RJ45 jacks, so one enquiry covers the chip and its line side. Test any combination on your own board before release.
Can JL2101 connect to an RGMII host at 2.5 V or 3.3 V?
The selector lists a 1.8 V interface voltage for all JL2101 parts. For a 2.5 V or 3.3 V host bank, check the I/O supply options in the datasheet and have our FAE team review the connection.
Which files can I download for JL2101?
Each part number links to a PDF JL2101 datasheet in the downloads section. 3D models and PCB footprints are not published, so draw the QFN40 land pattern from the package drawing and check it with your assembler.
Engineer support
JL2101 Gigabit Ethernet PHY samples and FAE help
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.
