05.1
Samples
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.
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LAN Transformer
WHDH12401N0 10/100BASE-TX LAN Transformer
Single-port 10/100BASE-TX LAN transformer (Ethernet transformer): 12-pin DIP, 1500 Vrms isolation, not PoE rated. Operating temperature 0 to +70 °C.
- Data rate
- 10/100BASE-TX
- Ports
- Single port
- Mounting
- DIP
- Isolation voltage
- 1500 Vrms
- PoE
- Not PoE rated
- Operating temperature
- 0 to +70 °C
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3D Model
PCB Layout / Package
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01Specifications
WHDH12401N0 specifications
Key attributes
ParameterValue
Data rate
10/100BASE-TX
Ports
Single port
Operating temperature
0 to +70 °C
PoE
Not PoE rated
Mounting
DIP
Pins
12
Pitch
2.0 mm
Electrical
ParameterValue
Isolation voltage
1500 Vrms
Values from published data for this part (parameters, FAQ and evaluation report). The datasheet prevails.
WHDH12401N0Need samples, or a value that is not in this table? Ask our FAE team.
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02Applications
Where WHDH12401N0 is used
- Switches and routers
- Wireless access points
- IP cameras
- Industrial control devices
Typical application
The transformer isolates the PHY from the cable and couples the TX and RX differential pairs to the RJ45 jack.
Center-tap biasing on the PHY side depends on the PHY type (voltage-mode or current-mode).
Typical application for reference. Follow the PHY vendor's reference design.
Design notes
- 01Connect the center taps according to your PHY type.Voltage-mode and current-mode PHYs need different center-tap biasing; a mismatch can break auto-negotiation.Check with your PHY →
- 02Terminate the line-side center taps with a Bob Smith network.It gives common-mode noise a defined path to chassis ground and helps EMC.
- 03Add line-side surge protection for outdoor or long-cable ports.Residual surge energy through the transformer can still damage the PHY.Troubleshooting guide →
Reference designs by application:Industrial ControlSecurity MonitoringData Communication
WHDH12401N0Not sure it fits your PHY and layout? An engineer can check your design.
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03Documents
Datasheet, CAD and reports
-
WHDH12401N0 Datasheet (PDF)2025-06-09 · This part Download ↓
-
3D model (STEP)2026-06-24 · This part Download ↓
-
PCB Layout / Package2025-12-29 · This part Download ↓
-
LAN Transformer Reliability TestLatest · Product family View →
-
LAN Transformer EU RoHS ReportLatest · Product family View →
-
REACH SVHC test reportLatest · Communication electronic components View →
WHDH12401N0Need another file format, or samples to test? Ask our FAE team.
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04Quality
Quality and compliance
DocumentNo.Issued / tested byDateApplies toActions
Certificate
Certificate · Company
ISO 9001:2015No. 19826Q02503R101
Quality management systemBeijing Xinjiyuan Certification Co., Ltd.Valid 2026-10-17 to 2029-10-16
19826Q02503R101
Beijing Xinjiyuan Certification Co., Ltd.
Valid2026-10-17 to 2029-10-16
Company
View PDF →
Verify →
Scope: R&D and sales of precision electronic connectors
Certificate
Certificate · Company
ISO 14001:2015No. 19826E01323R101
Environmental management systemBeijing Xinjiyuan Certification Co., Ltd.Valid 2026-10-17 to 2029-10-16
19826E01323R101
Beijing Xinjiyuan Certification Co., Ltd.
Valid2026-10-17 to 2029-10-16
Company
View PDF →
Verify →
Scope: R&D and sales of precision electronic connectors
Test report
Test report · LAN transformers
EU RoHSNo. WTH26H06190301C
2011/65/EU and (EU) 2015/863, 10 substancesWaltek Testing Group HCT (Shenzhen) Co., Ltd.Issued 2026-07-31
WTH26H06190301C
Waltek Testing Group HCT (Shenzhen) Co., Ltd.
Issued2026-07-31
LAN transformers
View PDF →
Test report
Test report · Communication electronic components
REACH SVHCNo. WTH26H06167853C
253 substancesWaltek Testing Group HCT (Shenzhen) Co., Ltd.Issued 2026-07-01
WTH26H06167853C
Waltek Testing Group HCT (Shenzhen) Co., Ltd.
Issued2026-07-01
Communication electronic components
View PDF →
ISO certificates cover VOOHU's management systems. RoHS and REACH test reports cover tested samples of each product family.
05Ordering
Ordering and delivery
06Compare
Same-series Comparison
Red marks values that differ from this part; data from the published parameters of each part.
Data rate
10/100BASE-TX
10/100BASE-TX
10/100BASE-TX
Mounting
DIP
SMD
SMD
Ports
Single port
Single port
Single port
Pins
12
16
16
Pitch
2.0 mm
1.27 mm
2.54 mm
Operating temperature
0 to +70 °C
−40 to +85 °C
−40 to +85 °C
Isolation voltage
1500 Vrms
2500 Vrms
4800 Vrms
PoE
Not PoE rated
Not PoE rated
Not PoE rated
WHDH12401N0Not sure which part in the series fits? Ask our FAE team which one to sample.
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07FAQ
FAQ LAN Transformer: WHDH12401N0
Can WHDH12401N0 replace WHD12401G directly because their main dimensions are similar?
A direct replacement cannot be assumed. Available model-level information gives both parts a 13.05 mm × 7.80 mm body, 12 pins, 2.00 mm pitch, 5.00 mm row spacing, and similar electrical limits, but it does not define the part-number difference or substitution relationship. Technical team confirmation is required. The preliminary assessment is based on their similar mechanical and electrical conditions; formal substitution must still be controlled by approved drawings, specification revisions, samples, and change approval.
How should the 7.50 mm maximum height and 3.00 ± 0.50 mm lead protrusion of WHDH12401N0 be handled in the library model?
Use a 13.05 ± 0.50 mm × 7.80 ± 0.50 mm body, 2.00 mm pin pitch, 5.00 mm row spacing, 10.00 ± 0.20 mm longitudinal span, and 0.90 mm recommended hole diameter for the PCB footprint. Retain the 7.50 mm maximum height and 3.00 ± 0.50 mm lead protrusion in the mechanical model, and check top-side clearance, PCB thickness, and solder-side fixtures.
How should engineering acceptance of WHDH12401N0 cover both magnetic and isolation performance?
For magnetic performance, verify the minimum 350 μH open-circuit inductance at 100 kHz, 0.1 V, and 8 mA bias, maximum 0.5 μH leakage inductance, maximum 1400 mΩ DC resistance, and 1CT:1CT ±5% turns ratio. For isolation, use the 1500 VAC, 1 mA, 60 s dielectric withstand test. The dielectric value is a test condition, not a continuous operating voltage.
08Support
Talk to an engineer
01Replace your current partSend the part number you use today. An engineer compares pinout, package and electrical ratings and lists the differences.Start a replacement review →
02Match it to your PHYTell us your PHY. We check center-tap wiring, termination and the matching RJ45 jack.Check my design →
03Link drops, hi-pot or EMC failuresSend the symptoms and test conditions. Get an FAE-reviewed troubleshooting checklist.Start troubleshooting →
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- VOOHU
- Founded in 2018
- Suzhou, China
- 1,500+ customers
- FAE support
Typical application
