06.1
Samples
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LAN Transformer
WHSG24301GM Gigabit LAN Transformer
Single-port 10/100/1000BASE-T LAN transformer (Ethernet transformer): 24-pin SMD, 1500 Vrms isolation, not PoE rated. Operating temperature −40 to +125 °C.
- Data rate
- 10/100/1000BASE-T
- Ports
- Single port
- Mounting
- SMD
- Isolation voltage
- 1500 Vrms
- PoE
- Not PoE rated
- Operating temperature
- −40 to +125 °C
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Product Datasheet
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Alternative PartsAlternative to Pulse Electronics HX5120NL
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01Specifications
WHSG24301GM specifications
Key attributes
ParameterValue
Data rate
10/100/1000BASE-T
Ports
Single port
Operating temperature
−40 to +125 °C
PoE
Not PoE rated
Mounting
SMD
Pins
24
Pitch
1.27 mm
Electrical
ParameterValue
Isolation voltage
1500 Vrms
Values from published data for this part (parameters, FAQ and evaluation report). The datasheet prevails.
WHSG24301GMNeed samples, or a value that is not in this table? Ask our FAE team.
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02Cross reference
WHSG24301GM as an alternative to Pulse Electronics HX5120NL
VOOHU WHSG24301GM can replace Pulse Electronics HX5120NL. See the evaluation reports below for details.
BrandPart No.CompatibilityKey differencesEvidence
BrandPulse Electronics
Part No.HX5120NL
CompatibilityReplacement
Key differences—
EvidenceEvaluation report →
Based on VOOHU replacement evaluations. Check both datasheets and validate with samples before switching.
03Applications
Where WHSG24301GM 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
WHSG24301GMNot sure it fits your PHY and layout? An engineer can check your design.
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04Documents
Datasheet, CAD and reports
-
WHSG24301GM Datasheet (PDF)2026-04-08 · This part Download ↓
-
3D model (STEP)2026-06-11 · This part Download ↓
-
PCB Layout / Package2026-04-08 · 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 →
WHSG24301GMNeed another file format, or samples to test? Ask our FAE team.
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05Quality
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.
06Ordering
Ordering and delivery
07Compare
Same-series Comparison
Red marks values that differ from this part; data from the published parameters of each part.
Data rate
10/100/1000BASE-T
10/100/1000BASE-T
10/100/1000BASE-T
Mounting
SMD
SMD
SMD
Ports
Single port
Single port
Dual port
Pins
24
24
50
Pitch
1.27 mm
1.27 mm
1.02 mm
Operating temperature
−40 to +125 °C
−40 to +85 °C
−40 to +85 °C
Isolation voltage
1500 Vrms
1500 Vrms
—
PoE
Not PoE rated
4PPoE (up to 3000 mA)
—
WHSG24301GMNot sure which part in the series fits? Ask our FAE team which one to sample.
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08FAQ
FAQ LAN Transformer: WHSG24301GM
Can the WHSG24301GM be used in a hot cabinet or close to a heat source at +125 °C?
Yes – the WHSG24301GM has a +125 °C upper operating limit, a step above the common +85 °C class. That is the component's own temperature boundary rather than an allowable ambient, so cabinet temperature plus the part's self-heating both have to land within it. Measure the component temperature at the highest planned internal temperature and worst airflow.
The part does not support PoE, so the port has to be powered locally. Other options are listed in the 10/100/1000 BASE-T range.
Is the 350 µH OCL of the WHSG24301GM the same thing as the 350 µH quoted on PoE parts?
No – the measurement conditions differ, so the two numbers are not directly comparable. The WHSG24301GM OCL is measured at 100 kHz and 0.1 V, while PoE parts in the same family add a DC bias: the WHSG24701D1 states the same 350 μH but with 8 mA of bias.
Bias shifts the core's operating point, so an OCL value quoted without its bias condition carries no comparative meaning. For incoming inspection or supplier comparison, set the fixture to the condition documented for that specific part.
How should you choose between the WHSG24301GM and the WHSG24301JM?
Decide on the low-temperature end: below -40 °C take the WHSG24301JM, and if -40 °C is enough take the WHSG24301GM. The two share an identical package, recommended pad layout, pin-to-net mapping and high-frequency limits, and both reach +125 °C at the top.
They differ at the cold end and in the OCL entry: the WHSG24301GM documents an OCL figure while the current WHSG24301JM datasheet does not list one, so choose the WHSG24301GM where incoming inspection has to judge against OCL. Because the mechanicals are identical, switching between them needs no board change.
09Support
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
