RMII to the host
The host port is RMII at a 3.3 V MAC interface voltage. RMII needs fewer signals than MII, keeping the processor link short; for an MII-only processor, see the JL5106.
Ethernet Interface Chip products
JL5104 100M Ethernet Switch IC
JL5104 provides three external 100M ports plus one RMII host uplink in a QFN48 package at 6 by 6 millimetres. It is the smallest configuration in the range that still lets the host controller take part in the network.
Part number search & selector
Find JL5104 100M Ethernet Switch IC part numbers
Filter JL5104 parts by data rate, port layout, interface mode, MAC voltage, supply, temperature, package and size.
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JL5104C-NC | SPEC | JL5104 series | 100M | 3+1 | RMII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃ | QFN48 | 6*6 mm |
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JL5104C-NI | SPEC | JL5104 series | 100M | 3+1 | RMII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | -40~85℃ | QFN48 | 6*6 mm |
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By port topology
Switch ICs by port count and uplink
Port notation such as 5+1 means five external ports plus one host uplink.
Series overview
Designing with the JL5104 Ethernet switch IC
The JL5104 Ethernet switch IC links a host processor’s RMII MAC with three external 100M copper ports, so the processor and the attached devices share one network. Counting the host port, it is a 4 port Ethernet switch IC with RMII, in a QFN48 package and commercial or industrial grades. For five external ports, compare the JL5105 without a host port and the JL5106 with MII.
Three copper ports
Each external port is 100M copper, and each port wired to an RJ45 jack needs its own magnetics; see our 10/100 Ethernet transformers. One port can take the network cable while two serve local devices.
QFN48 at 6 × 6 mm
JL5104C-NC and JL5104C-NI use a QFN48 package at 6 × 6 mm, small enough to sit beside the processor. The five-port JL5106 needs QFN64 at 9 × 9 mm.
Commercial or industrial grade
JL5104C-NC is rated 0 to 70 °C for indoor equipment, and JL5104C-NI −40 to +85 °C for an industrial Ethernet switch IC in cabinets. All other selector values match.
Applications
Where a JL5104 100M Ethernet switch IC fits
Typical designs keep the processor on the network and add local ports.
Gateways and smart home hubs
A hub processor with an RMII MAC can reach the home network on one port and link a camera or controller on the others.
Set-top and media boxes
A set-top or media box keeps its processor online through RMII and offers spare copper ports for a TV, console or second box nearby.
Compact controllers and I/O
Small controllers use JL5104C-NI, rated −40 to +85 °C, to join the plant network and daisy-chain I/O modules, leaving a port for service.
Documents
JL5104 Ethernet switch IC datasheet
Search by part number to open the JL5104 Ethernet switch IC datasheet, then check the RMII pins, supply sequence and QFN48 drawing.
Showing representative available file sets. Search to find a specific SKU.
JL5104C-NCJL5104 series
JL5104C-NIJL5104 series
- 2
- 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 JL5104 Ethernet switch IC from VOOHU
VOOHU is an authorized JLSemi distributor. A datasheet (PDF) is published for each JL5104 part number, so you can check the RMII pins and package before asking for samples or a quote.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples and 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 quote, send the part number and quantity, and we will confirm availability.
Coming from another switch IC
If you use another 100M switch IC today, send its part number and datasheet. Our FAE team compares host interface, registers and layout with the JL5104 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. Our FAE team supports JLSemi switch ICs and PHYs through design-in.
FAQ
Questions about the JL5104 Ethernet switch IC
Sourcing, PHY or switch, and design files.
What does 3+1 mean on this device?
Three external 100M ports facing the network, plus one dedicated RMII uplink for the host controller on the same board. The uplink is what lets the host send and receive traffic. If your design does not need the host on the network, compare the JL5105 with five external ports and no uplink.
What must the host provide?
An RMII interface at 3.3 volts, matching the device's MAC interface voltage. RMII uses a shared reference clock, so confirm the clock arrangement from the datasheet as well as the interface itself. An MII host cannot be connected to this device without changing the part.
What supply rails does it need?
A 3.3 volt main supply together with a core rail around 1.1 volts. Both rails and their sequencing are stated in the datasheet. Omitting the core rail, or bringing the rails up in the wrong order, typically prevents the device from starting at all.
Which temperature grades are available?
Two: the NC suffix covers 0 to 70 degrees and the NI suffix covers minus 40 to 85. Choose against the temperature inside the enclosure at the highest rated ambient, not the ambient the product sits in, because the board generates heat of its own.
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 external port count, the host interface and the temperature range, and a sales engineer will confirm candidates.
Is VOOHU an authorized distributor for the JL5104 Ethernet switch IC?
Yes. VOOHU is an authorized JLSemi distributor and supplies JL5104C-NC and JL5104C-NI for prototypes and production. Our FAE team can also check the RMII connection and port circuit.
Should I use the JL5104 or a single-port Ethernet PHY?
A single-port RMII PHY gives the processor one network port. The JL5104 connects to the same RMII MAC but provides three external 100M ports. If one port is enough, see our Ethernet PHY range.
Is there a 3D model for the JL5104 QFN48 package?
Not on this page: the selector lists a datasheet (PDF) for each JL5104 part number, without a 3D model or PCB footprint. Draw the QFN48 footprint from the datasheet’s package drawing.
Engineer support
Get JL5104 Ethernet switch IC 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
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Include the document revision
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Temperature, isolation voltage and PoE current basis
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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
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Prototyping / pilot build / production
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Specify sample and production timing separately
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Samples are free of charge. Sample quantity and lead time depend on the part number and project stage. Sales will respond on business days.
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