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WHDG48209P G 100/1000 BASE-T DIP dual port 48PIN
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LAN Transformer

WHDG48209P G Gigabit PoE+ LAN Transformer

Dual-port 10/100/1000BASE-T LAN transformer (Ethernet transformer): 48-pin DIP, 1500 Vrms isolation, PoE+ (up to 720 mA). Operating temperature −40 to +85 °C.

Data rate
10/100/1000BASE-T
Ports
Dual port
Mounting
DIP
Isolation voltage
1500 Vrms
PoE
PoE+ (up to 720 mA)
Operating temperature
−40 to +85 °C
WHDG48209P G LAN Transformer perspective view

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01Specifications

WHDG48209P G specifications

Key attributes

ParameterValue
Data rate 10/100/1000BASE-T
Ports Dual port
Operating temperature −40 to +85 °C
PoE PoE+ (up to 720 mA)
Mounting DIP
Pins 48
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.

WHDG48209P GNeed samples, or a value that is not in this table? Ask our FAE team. Get a Quote or Samples + Add to Inquiry

02Applications

Where WHDG48209P G is used

  • Switches and routers
  • Wireless access points
  • IP cameras
  • Industrial control devices

Typical application

Ethernet PHYWHDG48209P GRJ45 jackTD+1 TX+TD−2 TX−RD+3 RX+RD−6 RX−ESD / TVS (optional)TX · 1CT:1CTRX · 1CT:1CTCTCTPHY-side CT: bias per PHY typeR1 75 ΩR2 75 ΩC1 1000 pF / 2 kVBob Smith terminationShield to chassis

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

  1. 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 →
  2. 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.
  3. 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

WHDG48209P GNot sure it fits your PHY and layout? An engineer can check your design. Get a Quote or Samples + Add to Inquiry
  • WHDG48209P G Datasheet (PDF)2025-08-20 · This part Download ↓
  • 3D model (STEP)2026-06-04 · This part Download ↓
  • PCB Layout / Package2025-12-26 · 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 →
WHDG48209P GNeed another file format, or samples to test? Ask our FAE team. Get a Quote or Samples + Add to Inquiry

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 →
Test report Test report · Product family Reliability test report
— — — Product family 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

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.

Get a Quote or Samples →

06Compare

Same-series Comparison

Red marks values that differ from this part; data from the published parameters of each part.

Parameter WHDG48209P GThis part WHSG48005N0 WHSG24301GM
Data rate 10/100/1000BASE-T 10/100/1000BASE-T 10/100/1000BASE-T
Mounting DIP SMD SMD
Ports Dual port Dual port Single port
Pins 48 48 24
Pitch 2.0 mm 1.02 mm 1.27 mm
Operating temperature −40 to +85 °C 0 to +70 °C −40 to +125 °C
Isolation voltage 1500 Vrms 1500 Vrms 1500 Vrms
PoE PoE+ (up to 720 mA) Not PoE rated Not PoE rated
WHDG48209P GNot sure which part in the series fits? Ask our FAE team which one to sample. Get a Quote or Samples + Add to Inquiry

07FAQ

FAQ LAN Transformer: WHDG48209P G

What is the PoE capability of WHDG48209PG?

The specifications state that PoE supports 30 W and each channel can withstand 720 mA DC balance current. 30 W corresponds to IEEE 802.3at, also known as PoE+. The original text is given by channel. When making a port power supply budget, please understand it according to the original text. Do not multiply the number of channels to convert to the total port current. This paragraph does not apply when the port is to be powered according to 802.3bt Type 3/Type 4. Tell us the target current per port, and VOOHU will confirm the applicable scope based on current controlled data.

How many Gigabit ports does the 48 PIN of WHDG48209PG correspond to?

Two. There are 8 `1CT:1CT` inside, forming 8 channels and 4 pairsets - each Gigabit port occupies 2 pairsets, so it is a dual Gigabit port. The Chip Side (1–24 pins) and Cable Side (25–48 pins) are clearly marked on the schematic diagram. The same 48-pin 100Mbps device will have four ports, because each 100Mbps port only needs 2 channels; when inferring the number of ports based on the number of pins, you must first determine the speed range, otherwise the difference will be doubled.

Can WHDG48209PG be used outdoors or in industrial sites?

Operating temperature -40 °C to +85 °C, covering common temperature ranges in outdoor and industrial sites. The WHDG48209PG has 40 °C more cold end than most 0 °C to +70 °C plug-in Gigabit parts in this catalog. It should be noted that this is the operating temperature range of the device itself. The actual temperature inside the chassis plus the self-heating of the device must fall within this range. Therefore, the device temperature point should still be measured at the highest planned internal temperature of the whole machine and the most unfavorable air duct. The isolation withstand voltage is 1500 VAC/1 mA/60 seconds. The package is plug-in type and is wave soldered.

08Support

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