Port notation
A figure such as 5+1 means five external ports plus one host uplink. A single figure such as 5 or 8 means external ports only, with no separate uplink.
Ethernet Interface Chip products
Ethernet Switch ICs
The range covers 100M and gigabit switching from three to ten ports, with or without a host uplink. Start from the port topology your design needs, because whether the host takes part in forwarding decides the series long before speed or package does.
Part number search & selector
Find Ethernet Switch ICs part numbers
The table uses the current English-site product records, published selection fields and part-specific technical-file links.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
Series
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Data Rate
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Ports
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Interface Mode
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MAC interface voltage
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External supply voltage
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Copper Port
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Optical Port
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Temperature
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Package
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Size
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| Image | Part number | Datasheet | Compare | Downloads | Series | Data Rate | Ports | Interface Mode | MAC interface voltage | External supply voltage | Copper Port | Optical Port | Temperature | Package | Size | Sample |
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JL5105C-NC | SPEC | JL5105 series | 100M | 5 | NA | NA | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃ | QFN48 | 6*6 mm |
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JL5105C-NI | SPEC | JL5105 series | 100M | 5 | NA | NA | 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.
How to select
Selecting an Ethernet switch IC in four steps
Topology first, then speed, then the supply rails, then package and thermals.
- 01
Decide the port topology
Count the external ports you need, then decide whether the host has to send and receive traffic. If it does, you need a device with an uplink port.
- 02
Choose 100M or gigabit
The range covers 100M and gigabit. There are no 2.5G or faster devices here, so if the design needs those speeds, say so at enquiry.
- 03
Check the supply rails
Most devices need a low voltage core rail alongside the main supply. Confirm the rails and their sequencing before the power tree is fixed.
- 04
Plan package and thermals
Packages run from QFN48 at 6 by 6 up to TQFP176 at 20 by 20 millimetres. Higher port counts concentrate more heat in one device.
Parameters
Reading switch IC specifications
Port notation and the supply requirement are the two figures most often misread.
Link speed
100M on the JL51xx series, gigabit on the JL61xx series. Every device also supports 10Base-T on copper for legacy links.
Uplink interface
MII on most devices with an uplink, RMII on the JL5104. Devices listed as NA have no dedicated host interface at all.
Supply rails
Typically a 3.3 volt main supply with a 1.1 volt core rail, or 1.1 volt alone on some gigabit parts. Missing a rail prevents the device starting.
Fibre support
1000Base-X appears on the JL6110 and on the S variants of the JL6107. Other devices in the range are copper only.
Temperature grade
NC and PC suffixes cover 0 to 70 degrees; NI and PI cover minus 40 to 85. Not every series offers both grades.
Compare
Switch IC series side by side
Port count and uplink presence separate the series more than speed does.
Return to the selector ↑| Series | Parts | Data Rate | Ports | Interface Mode | MAC interface voltage | External supply voltage | Copper Port | Optical Port | Temperature | Package | Size | Action |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JL5104 series | 2 | 100M | 3+1 | RMII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃, -40~85℃ | QFN48 | 6*6 mm | Filter → |
| JL5105 series | 2 | 100M | 5 | NA | NA | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃, -40~85℃ | QFN48 | 6*6 mm | Filter → |
| JL5106 series | 2 | 100M | 5+1 | MII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃, -40~85℃ | QFN64 | 9*9 mm | Filter → |
| JL5108 series | 2 | 100M | 8 | NA | NA | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃, -40~85℃ | QFN64 | 9*9 mm | Filter → |
| JL5109 series | 1 | 100M | 8+1 | MII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃ | QFN88 | 10*10 mm | Filter → |
| JL5110 series | 1 | 100M | 8+2 | MII | 3.3V | 3.3V(1.1V)¹ | 10 Base-T | NA | 0~70℃ | QFN88 | 10*10 mm | Filter → |
| JL6105 series | 1 | 1G | 5 | NA | NA | 1.1V | 10 Base-T | NA | 0~70℃ | QFN88 | 10*10 mm | Filter → |
| JL6107 series | 6 | 1G | 5+2 | MII | 1.8V | 1.1V, 3.3V(1.1V)¹ | 10 Base-T | NA, 1000 Base-X | 0~70℃, -40~85℃ | LQFP128 | 14*14 mm | Filter → |
| JL6108 series | 1 | 1G | 8 | NA | NA | 1.1V | 10 Base-T | NA | 0~70℃ | LQFP128 | 20*14 mm | Filter → |
| JL6110 series | 2 | 1G | 8+2 | MII | 3.3V | 1.1V | 10 Base-T | 1000 Base-X | 0~70℃, -40~85℃ | TQFP176 | 20*20 mm | Filter → |
Application review
Where these switch ICs are used
Confirm the port topology, whether the host must manage traffic, and the environment.
Embedded devices with a few ports
- Confirm whether the host must join the network. If it does, choose a device with an uplink such as the 3+1 or 5+1 configurations.
Unmanaged port expansion
- Where the host does not need to send traffic, a device with external ports only is simpler and needs no uplink routing.
Industrial switches with fibre uplink
- Check which specific part supports 1000Base-X, then confirm the optical module and the supply rails the device needs.
Cascaded multi-device designs
- Two uplinks allow one to reach the host and one to cascade. Estimate cross-device traffic so the cascade link does not bottleneck.
Documents
Switch IC datasheets and reference designs
Datasheets carry the supply sequencing, pinout and reference schematic per device.
Showing representative available file sets. Search to find a specific SKU.
JL5104C-NCJL5104 series
JL5104C-NIJL5104 series
JL5105C-NCJL5105 series
JL5105C-NIJL5105 series
JL5106C-NCJL5106 series
JL5106C-NIJL5106 series
- 20
- 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.
Category overview
Reading port notation and choosing the topology
Almost every selection question on switch ICs comes down to the port notation and whether the host controller needs to be on the network.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
What 5+1 actually means
The first figure is external ports facing the outside world. The figure after the plus is a host uplink, a dedicated interface for the controller on the same board. A device listed as 5 has five external ports and no uplink, so the host cannot send or receive traffic through it. That distinction eliminates half the range.
When you need an uplink
If the product only has to move traffic between its own front panel ports, a device with external ports only is simpler and cheaper to lay out. If the host has to participate, for management, for remote access or because it originates data, you need an uplink and the host must provide the matching MII or RMII interface.
The supply rails catch people out
Most devices here need more than one rail: commonly 3.3 volts for the main supply and around 1.1 volts for the core, and some gigabit parts run the core alone. Missing a rail, or sequencing them wrongly, prevents the device starting. Confirm the rails and sequence before the power tree is committed.
FAQ
Ethernet switch IC questions engineers ask
Answers cover port notation, uplinks, supply rails and fibre support.
What does a port figure like 5+1 mean?
Five external ports facing the network, plus one dedicated host uplink for the controller on the same board. A device listed with a single figure, such as 5 or 8, has that many external ports and no uplink, which means the host cannot send or receive traffic through the switch at all.
Do I need a device with an uplink?
Only if the host controller has to be on the network, whether to manage the switch, to be reachable remotely, or because it originates traffic. If the product only forwards between its own front panel ports, a device without an uplink is simpler to design and lay out.
What speeds does this range cover?
100M on the JL51xx series and gigabit on the JL61xx series, with 10Base-T supported on copper throughout. There are no 2.5G, 5G or 10G devices in this range. If your design needs multi-gigabit switching, tell us at enquiry and we will confirm what is available.
Which parts support fibre?
1000Base-X is supported on the JL6110 and on the S variants of the JL6107 series. The remaining devices are copper only. Because fibre support varies between variants within a series, check the complete part number rather than relying on the series name.
What supply rails do these devices need?
Most need a 3.3 volt main supply together with a core rail around 1.1 volts, while some gigabit parts run from the core rail alone. The datasheet states both the rails and the sequence they must come up in. A missing or mis-sequenced rail usually prevents the device starting.
Can I cascade two switch ICs?
Devices with two uplinks allow one link to the host and one to a second switch. Before doing so, estimate how much traffic crosses between the two devices, because everything that crosses has to pass through the cascade link, which can become the bottleneck for the whole design.
How much heat should I plan for?
It rises with port count and speed. The largest devices here are TQFP176 at 20 by 20 millimetres with ten gigabit ports, which concentrates significant power in one package. Follow the datasheet thermal pad guidance and measure the case temperature at full load in the real enclosure.
How do I request switch IC 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, whether the host needs an uplink, the required speed, any fibre requirement and the temperature range.
Engineer support
Continue after product selection
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
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