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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3D Model
PCB Layout / Package
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- Free samples for selected parts
- Lead time typically 7–10 days
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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 is a functional alternative to Pulse Electronics HX5120NL — verify with samples in your design. See the evaluation reports below for the differences.
BrandPart No.CompatibilityKey differencesEvidence
BrandPulse Electronics
Part No.HX5120NL
CompatibilityFunctional alternative · verify with samples
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
DIP
SMD
Ports
Single port
Dual port
Dual port
Pins
24
48
48
Pitch
1.27 mm
2.0 mm
1.02 mm
Operating temperature
−40 to +125 °C
−40 to +85 °C
0 to +70 °C
Isolation voltage
1500 Vrms
1500 Vrms
1500 Vrms
PoE
Not PoE rated
PoE+ (up to 720 mA)
Not PoE rated
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
WHSG24301GM AT +125 °C HIGH-TEMPERATURE CABINET OR NEAR-HEAT SOURCE POSITION
Yes, the working temperature limit for WHSG 24301GM is +125 & Deg; C, above the common +85 & Deg; C-I. However, this is its own temperature boundary, which is not a permitted ambient temperature — — the actual temperature in the cabinet, plus the unit ' s own heat, falls within this limit and therefore still needs to be measured within the maximum plan of the unit and under the most adverse windways. This type does not contain PoE and the port is supplied locally by the equipment.
WHSG24301GM OCL 350 μH, and PEE 350 μH is one thing
Not at all. The measurement conditions are different and the two figures cannot be directly compared. WHSG24301GM OCL measured under 100 kHz, 0.1 V; the same series PoE model imposes an additional straight-flow bias, e.g. WHSG24701D1 is the same 350 & micro; H with 8 MA bias. The bias changes the working point of the magnetic core, so the OCL values that are removed from the bias condition are not comparable. When a material test is performed or a match is made between the supplier and the supplier, the condition of the cure must be consistent with the written conditions of the model.
WHSG 24301 GM AND WHSG 24301JM, WHAT SHOULD WE DO
For lowest temperature: below -40 & Deg; C for WHSG 24301 JM, -40 & Deg; C for WHSG 24301 GM. The existing specifications of the two sections, covering, recommended welding, and retwelding & mdash; web map is fully consistent with all HF indicators, with a ceiling of +125 & Deg; and C, with a difference of only at low temperature with the OCL entry & mdash; & mdash; WHSG24301GM for writing OCL, WHSG24301JM are not included, and therefore WHSG24301GM will have to be selected for determination by OCL. Because the two are identical machines, the remodeling does not require a change of board.
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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Typical application
