06.1
Samples
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WHSG24301G Single Port SMD（Low height）Gigabit Base-T PIN24 non-PoE LAN Transformer
LAN Transformer
WHSG24301G Gigabit LAN Transformer
Single-port 10/100/1000BASE-T LAN transformer (Ethernet transformer): 24-pin SMD (low profile), 1500 Vrms isolation, not PoE rated. Operating temperature 0 to +70 °C.
- Data rate
- 10/100/1000BASE-T
- Ports
- Single port
- Mounting
- SMD (low profile)
- Isolation voltage
- 1500 Vrms
- PoE
- Not PoE rated
- Operating temperature
- 0 to +70 °C
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Alternative PartsAlternative to Pulse Electronics H5120NL
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3D Model
PCB Layout / Package
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01Specifications
WHSG24301G specifications
Key attributes
ParameterValue
Data rate
10/100/1000BASE-T
Ports
Single port
Operating temperature
0 to +70 °C
PoE
Not PoE rated
Mounting
SMD (low profile)
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.
WHSG24301GNeed samples, or a value that is not in this table? Ask our FAE team.
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02Cross reference
WHSG24301G as an alternative to Pulse Electronics H5120NL
VOOHU WHSG24301G can replace Pulse Electronics H5120NL. See the evaluation reports below for details.
BrandPart No.CompatibilityKey differencesEvidence
BrandPulse Electronics
Part No.H5120NL
CompatibilityReplacement
Key differences—
EvidenceEvaluation report
Based on VOOHU replacement evaluations. Check both datasheets and validate with samples before switching.
03Applications
Where WHSG24301G 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
WHSG24301GNot sure it fits your PHY and layout? An engineer can check your design.
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04Documents
Datasheet, CAD and reports
-
WHSG24301G Datasheet (PDF)2024-11-25 · This part Download
-
3D model (STEP)2026-06-11 · 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
WHSG24301GNeed 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 (low profile)
SMD
DIP
Ports
Single port
Dual port
Single port
Pins
24
50
18
Pitch
1.27 mm
1.02 mm
1.78 mm
Operating temperature
0 to +70 °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
WHSG24301GNot sure which part in the series fits? Ask our FAE team which one to sample.
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08FAQ
FAQ LAN Transformer: WHSG24301G
How tall is the WHSG24301G, and will it fit a slim enclosure?
The WHSG24301G stands 2.50 mm at most over a body of 16.50 mm by 9.00 mm, which puts it in the low-profile class. That height lets it go into set-top boxes, slim access points, laptop docks and all-in-one units where board clearance is tight. Note that this is the limit on the component body: enclosure clearance still has to allow for stand-off after soldering and for board bow.
The WHSG24301G operates from 0 °C to +70 °C and carries no PoE rating, so the port has to be powered locally. Where the mechanics allow 2.85 mm, the wide-temperature part in the same package drops onto the same land pattern; the full list is in the 100/1000 BASE-T range.
Can the centre taps of the WHSG24301G carry current?
No. The datasheet assigns no DC balance current capability to the centre taps of the WHSG24301G, so they cannot be used as a supply path. The four centre taps come out on pins 3 and 4, 9 and 10, 15 and 16, and 21 and 22, named TXCT and TDCT, and should be terminated according to the reference design for the target PHY.
One point is easy to miss when checking margin: the open-circuit inductance minimum of the WHSG24301G is published without a bias condition, whereas the WHSG24002G quotes the same minimum with a DC bias applied. The two do not sit on the same measurement basis and should not be quoted interchangeably.
How do I choose between the WHSG24301G and the WHSG24301TG?
Two things decide it: operating temperature and board clearance. Take the WHSG24301TG for -40 °C to +85 °C, but allow 2.85 mm of height for it; the WHSG24301G tops out at 2.50 mm and covers 0 °C to +70 °C. This is not simply a commercial-versus-industrial pair – moving to the wide-temperature part costs 0.35 mm of height, which a slim enclosure may not have.
The suggested land pattern, lead span and pin-to-net assignment are identical value for value, as is every electrical figure, so the board itself does not change. Reel quantities differ between the two, so plan production against the figure for the part actually ordered.
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
