RMII at 1.8 V
JL1101BR-NI talks RMII to the host at a 1.8 V interface voltage. Match the host’s RMII pin level and check the reference clock scheme in the datasheet.
Ethernet Interface Chip products
JL1101 100M Ethernet PHY
JL1101 is a single port 100M PHY with an RMII MAC interface and 100Base-FX fibre support, in a QFN24 package measuring 4 by 4 millimetres. The industrial grade covers minus 40 to 85 degrees. Confirm your host provides RMII before selecting it.
Part number search & selector
Find JL1101 100M Ethernet PHY part numbers
Filter JL1101 by rate, ports, MAC interface, voltage, copper and optical port, mode, temperature, package and size.
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JL1101BR-NI | SPEC | JL1101 series | 100M | 1 | RMII | 1.8V | 10 Bsae-T | 100 Base-FX | RMII-COP | -40~85℃ | QFN24 | 4*4 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
Designing in the JL1101 100M Ethernet PHY
The JL1101 100M Ethernet PHY connects a controller’s RMII MAC to a copper or fiber port, sitting between the MAC and the magnetics or optical module. It is also listed as an RMII PHY, a 10/100 Ethernet PHY or a compact Ethernet transceiver. The selector shows an industrial-grade part in QFN24; MII hosts should see the JL1111 series.
Copper or 100BASE-FX
On copper it covers 10BASE-T and the 100M data rate, so it serves a 10/100 port. The 100BASE-FX optical side suits fiber runs through electrical noise.
QFN24, 4 × 4 mm
At 4 × 4 mm, the QFN24 leaves room by the RJ45 jack for magnetics and protection. The −40 °C to +85 °C rating suits outdoor and industrial equipment.
Magnetics and line side
Copper builds need 10/100 magnetics, such as VOOHU’s 10/100 Ethernet transformers, to evaluate with JL1101; fiber builds connect the 100BASE-FX side to an optical transceiver instead.
Applications
Where a JL1101 100M Ethernet PHY fits
JL1101 designs pair an RMII controller with one 10/100 or fiber link.
MCU controllers and remote I/O
Microcontrollers with an RMII MAC run remote I/O, building controllers and small PLCs, where this Ethernet transceiver needs little board space.
100BASE-FX across noisy sites
In substations, rail cabinets and long plant runs, fiber avoids ground loops. JL1101BR-NI provides that 100BASE-FX link from the same RMII host.
Gateways, meters and sensors
Protocol gateways, energy meters and networked sensors rarely need more than 100M; a 10/100 transceiver on RMII keeps their boards small.
Documents
JL1101 100M Ethernet PHY datasheet
Search for JL1101BR-NI to open its datasheet and check the RMII pins, fiber circuit and QFN24 drawing before layout.
Showing representative available file sets. Search to find a specific SKU.
JL1101BR-NIJL1101 series
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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
Buying the JL1101 100M Ethernet PHY through VOOHU
VOOHU is an authorized JLSemi distributor. JL1101BR-NI has a PDF datasheet with the pinout, RMII timing and QFN24 drawing for layout.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples and quotations
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, send the part number, quantity and build date, and we will confirm availability.
Replacing an RMII PHY
Send the part number and datasheet of your current 10/100 PHY. Our FAE team compares the RMII connection, package and temperature range, reviews register 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
JL1101 100M Ethernet PHY questions
Authorized supply, the RMII-COP mode and when to move to JL1111.
What MAC interface does JL1101 use?
RMII, a reduced pin count interface that uses fewer signals than MII at the cost of requiring a shared reference clock. Your host controller must provide RMII, and the reference clock arrangement must match what the datasheet specifies. RMII cannot be connected to an MII or RGMII host.
Does JL1101 support fibre?
Yes, it supports 100Base-FX as well as copper including 10Base-T. Enabling the fibre mode requires the configuration and external circuit described in the datasheet reference design, and a matching optical module. Decide copper or fibre during design rather than after layout.
How small is the package?
QFN24 at 4 by 4 millimetres, the smallest in the PHY range. That suits boards where space around the connector is tight. The fine pitch requires care with the land pattern and the thermal pad, and the differential pairs need controlled impedance on the layout.
What temperature grade is available?
The listed part covers minus 40 to 85 degrees, an industrial grade suitable for cabinets and enclosed equipment. Select against the temperature inside the enclosure at the highest ambient the product is rated for, allowing for the heat the board itself produces.
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 and its MAC interface, and whether you need a fibre port, and a sales engineer will confirm candidates.
Is VOOHU an authorized distributor of the JL1101 100M Ethernet PHY?
Yes. VOOHU is an authorized JLSemi distributor and supplies JL1101BR-NI for development and production, with FAE review of the RMII connection and port circuit.
What does RMII-COP mean in the JL1101 selector?
It is the listed operating mode: RMII on the host side, copper on the line side. For the 100BASE-FX optical port, follow the fiber configuration in the JL1101 datasheet.
When is the JL1111 series a better fit than JL1101?
Choose JL1111, in a larger QFN32 package, when the host offers MII instead of RMII, the board must run up to +105 °C, or the design needs the EtherCAT variant.
Engineer support
JL1101 100M Ethernet PHY samples and 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.
