Transformer products
Select LAN transformers for 10BASE-T/100BASE-TX copper ports. This range includes SMD, low-profile SMD and DIP options, with filters for ports, temperature and PoE needs. Start with an industrial control interface, Fast Ethernet switch port or existing-board replacement, then check compatibility against the PHY and part documentation.
Part number search & selector
Filter 10/100BASE-TX transformers by mounting method, ports, pin count, pitch, operating temperature, isolation voltage and PoE support.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
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| Image | Part number | Datasheet | Compare | Downloads | Data Rate | Mounting Method | Ports | Pins | Pitch | Operating Temperature | Vt (V RMS) | PoE | Sample |
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WHDG30201G | SPEC | 10/100 Base-TX | DIP | Triple Ports | 30 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHDG30101G | SPEC | 10/100 Base-TX | DIP | Triple Ports | 30 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHDG30102G | SPEC | 10/100 Base-TX | DIP | Triple Ports | 30 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD20805G | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD20K01G | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.54mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD20702G | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD20701G | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD20601TG | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.54mm | -40 up to +85 °C | 1500 | Non-PoE |
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WHD20601G | SPEC | 10/100 Base-TX | DIP | Dual Ports | 20 Pin | 2.54mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD16506G | SPEC | 10/100 Base-TX | DIP | Single Port | 16 Pin | 2.54mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD16503G | SPEC | 10/100 Base-TX | DIP | Single Port | 16 Pin | 2.54mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD16027G | SPEC | 10/100 Base-TX | DIP | Single Port | 16 Pin | 2.54mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD12502G | SPEC | 10/100 Base-TX | DIP | Single Port | 12 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHD12501TG | SPEC | 10/100 Base-TX | DIP | Single Port | 12 Pin | 2.0mm | -40 up to +85 °C | 1500 | Non-PoE |
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WHD12503G | SPEC | 10/100 Base-TX | DIP | Single Port | 12 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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WHSH16012P4 | SPEC | 10/100 Base-TX | SMD | Single Port | 16 Pin | 1.27mm | -40 up to +85 °C | 1500 | PoE+ (up to 720 mA) |
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WHSH16F01D4 | SPEC | 10/100 Base-TX | SMD | Single Port | 16 Pin | 2.54mm | -40 up to +85 °C | 4800 | Non-PoE |
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WHSH16037D0 | SPEC | 10/100 Base-TX | SMD | Single Port | 16 Pin | 1.27mm | -40 up to +85 °C | 2500 | Non-PoE |
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WHDH12401N0 | SPEC | 10/100 Base-TX | DIP | Single Port | 12 Pin | 2.0mm | 0 up to 70 °C | 1500 | Non-PoE |
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Product family quick links
Counts reflect the current public selector data.
Series overview
These 10/100 Ethernet transformers, also called Fast Ethernet transformers or 10/100 Ethernet magnetics, couple a 10BASE-T/100BASE-TX PHY to the RJ45 port and isolate the cable from the board. A 10/100 LAN transformer serves the two data pairs that a Fast Ethernet port uses. The range covers DIP, SMD and low-profile SMD packages, single-port and multi-port modules, commercial and extended temperature grades, and a few PoE-rated parts. Moving to a faster port? Compare Gigabit Ethernet transformers or 2.5G and 5G Ethernet transformers.
Most single-port boards use a 16-pin LAN transformer in an SMD package; WHS16503G is a commercial-grade 10/100 SMD LAN transformer. Where several ports sit side by side, WHS40005TG covers four ports in one 40-pin SMD body.
Through-hole boards can use DIP modules such as the five-port, 72-pin WHD72301G. If the enclosure limits height, low-profile SMD parts such as WH16603T1 keep the single-port 16-pin layout in a lower body.
Most parts are rated 0 to 70 °C. For harsher environments, WHS16002GA is rated −40 to +125 °C and WHS16002GM −55 to +150 °C, while WHS16037-2KG raises the isolation test voltage to 2,500 Vrms.
Most 10/100 Ethernet transformers in this range are non-PoE. WHS16002-1PTG and WHSH16012P4 are listed for PoE+ up to 720 mA and WHS160B1PTG for 4PPoE up to 850 mA; confirm the PSE or PD role and the powered pairs in the datasheet.
Applications
Fast Ethernet is still the practical speed for many connected devices that move small amounts of data. Typical designs that use a 10/100 Ethernet transformer:
MCUs and SoCs with a built-in 10/100 PHY, such as gateways, data loggers and smart meters, place a discrete 10/100 LAN transformer between the PHY and a plain RJ45 jack, usually a single-port 16-pin part.
PLCs, HMIs, access control units and building controllers often run their network port at 100 Mb/s. Extended-temperature parts such as WHS16002GA, rated −40 to +125 °C, suit enclosures that run hot.
Small 10/100 switches save board space by combining several ports in one module, while powered devices such as IP phones and 100 Mb/s IP cameras use PoE-rated parts such as WHS16002-1PTG.
Downloads & technical resources
Search by part number to download the 10/100 Ethernet transformer datasheet, 3D model and PCB footprint, then check the pinout, dimensions and electrical limits before layout.
Showing representative available file sets. Search to find a specific SKU.
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
VOOHU is a manufacturer of LAN transformers, with its own magnetics factory in Mianyang. Datasheets, 3D models and PCB footprints are published for the 10/100 Ethernet transformers on this page, so you can shortlist parts here and then request samples or a quotation for the ones that fit your PHY and enclosure.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
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 numbers, quantity and target production date; typical lead time is 7–10 days.
To replace an imported part, send its part number and datasheet. Our FAE team compares the pinout, turns ratio, isolation voltage and footprint, then suggests VOOHU replacement candidates for you to validate with samples before production.
VOOHU is ISO 9001 and ISO 14001 certified, and its LAN transformers are RoHS and REACH compliant (third-party test reports). Since 2018 the company has supplied more than 1,500 customers, including 150+ listed companies.
FAQ & related guides
Answers on PHY matching, PoE, temperature grades, datasheets and ordering. Part-specific limits always come from the datasheet.
Similar pin count or package size does not make it suitable. 1000BASE-T uses four data pairs and requires magnetics matching its PHY and electrical requirements. For a Gigabit upgrade, review the internal structure, electrical data and board connections using the Gigabit range.
Yes. WH16603T1 is listed as low-profile SMD, and its published datasheet specifies an operating range of −40°C to +105°C. Low profile therefore does not mean commercial-temperature-only. This range applies to that part; check its mechanical drawing and current documentation for height and assembly conditions.
Specify the PSE/PD role and power arrangement first, then select a part that explicitly supports the required PoE conditions. The data-pair arrangement does not by itself determine the powered pairs. Do not infer PoE capability from matching dimensions when it is not specified.
Not based on pin count alone. Check every pin function, center taps, dimensions and electrical conditions. Share the existing part and PCB constraints so a sales engineer can coordinate an FAE comparison. Decide on replacement after the relevant board validation.
Send the full part number, quantity and destination to start a request. If the part is not selected, begin with your PHY, mounting requirement or existing component. We handle sample/pricing requests and selection questions according to your needs; complete technical documentation is not required to start a discussion.
Yes. VOOHU manufactures LAN transformers, including the 10/100 Ethernet transformers on this page, in its own magnetics factory in Mianyang, China. Datasheets, 3D models and PCB footprints are published for these part numbers.
Start with a single-port 16-pin LAN transformer that matches the turns ratio and center-tap arrangement in the PHY reference design, for example WHS16503G for 0 to 70 °C or WHS16002GA for −40 to +125 °C. Send the PHY part number if you would like our FAE team to check the match.
Use the file finder in the downloads section: search by part number to get the datasheet, 3D model and PCB footprint. The datasheet shows the schematic, dimensions and electrical limits you need for design review.
Engineer 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.
Include the document revision
Temperature, isolation voltage and PoE current basis
Pin count, pitch and spacing between pin rows
To help prioritize samples and evaluation
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
From the selector or engineering review
Prototyping / pilot build / production
Specify sample and production timing separately
Compliance documents, material declarations or third-party reports
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. Sales will respond on business days.
