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2026-08-28

PoE Ethernet Port Design: Six Questions Engineers Ask Most

VOOHU explains six common PoE design questions, from LAN Transformer DC bias and IEEE 802.3af/at/bt current ratings to 90 W component selection and the PD-side power budget.

2026-08-31

Push-Pull Transformer Selection Comparison: VOOHU WHST06Q02E0 vs. Würth Elektronik 750316819

VOOHU WHST06Q02E0 is a 1CT:2.88CT, six-pin SMT push-pull transformer with 86 µH open-circuit inductance, 2500 VAC isolation test voltage, and a −40°C to +125°C operating range.

2026-08-31

BMS Isolation Transformer Selection Comparison: VOOHU WHST06Y01A0 vs. Pulse HM1238NLT

VOOHU WHST06Y01A0 is a six-pin SMT isolation transformer for BMS applications. Its 1CT:1CT winding arrangement, 300 µH-class open-circuit inductance, and high-voltage isolation test conditions make it a candidate for comparison with HM1238NLT.

2026-08-31

Do Ethernet Couplers Reduce Speed? Gigabit-to-100-Mb/s Drops, Cat6 Shielding and Panel Mounting | VOOHU

Diagnose speed drops after an Ethernet cable extension and choose VOOHU Cat6 couplers by cable entry, shielding and panel configuration.

2026-08-28

100/1000 BASE-T PoE+ LAN Transformer Selection Comparison: VOOHU WHSG24R03C0 vs. CND-tek G24191S

1. Competitor Product Overview (CND-tek) A single-port Gigabit PoE+ interface has four differential channels to manage. Its magnetics must carry the 1000BASE-T signal path while maintaining cable isolation, common-mode behavior, and power current. CND-tek

2026-08-28

10/100 BASE-TX LAN Transformer Selection Comparison: VOOHU WHSH16109N0 vs. Bothhand NS0013 LF

1. Competitor Product Overview (Bothhand Enterprise Inc.) For PC Card, CardBus, and compact 10/100M Ethernet interface designs, Bothhand NS0013 LF uses a 16-pin SMD package with 1CT:1CT TX and RX windings. For an existing-board sourcing change, pin functi

2026-08-28

How to Stop Molded Power Inductor Coil Whine: Light-Load PFM, Magnetostriction, IRMS and ISAT Selection | VOOHU

A practical method for tracing light-load inductor noise and choosing VOOHU molded inductors by L, DCR, IRMS, ISAT and mechanical constraints.

2026-08-27

PoE Power Transformer Selection Comparison: VOOHU WHEP7089 vs. Coilcraft POE30P-12LD Replacement Evaluation

VOOHU WHEP7089 and Coilcraft POE30P-12LD are compared for 3 W PoE flyback power transformer replacement evaluation, with attention to terminal topology, electrical test conditions, and PCB fit.

2026-08-27

How to choose between single channel and dual channel BMS isolation transformer? 600–1600V operating voltage, CMC and daisy chain break positioning | VOOHU

From the aspects of single/dual channel, 600–1600VDC operating voltage, isolation withstand voltage, CMC and chain break waveform, the selection and verification method of BMS daisy chain isolation transformer is explained.

2026-08-26

Push-pull transformer selection comparison: VOOHU WH41-111 and Würth Elektronik 78931812505 replacement evaluation

VOOHU WH41-111 vs. Würth Elektronik 78931812505 push-pull transformer replacement evaluation focusing on terminal topology, turns ratio, isolation withstand voltage, volt-seconds, leakage inductance, and PCB pad boundaries.

2026-08-26

How to choose multi-phase Buck coupling inductor? Load transient verification of 72–320nH, DCR and high temperature saturation current｜VOOHU

From the phase-to-phase coupling, 72-320nH inductance, DCR, high temperature saturation current and load step waveform, the selection and verification method of multi-phase Buck combination inductor is explained.

2026-08-25

How to Choose an SFP Cage Light Pipe: Panel Matching for No-Light, 1×4 Light-Pipe, and 2×6 Outer-Dual-Light Designs | VOOHU

Learn how to choose a no-light, 1×4 light-pipe, or 2×6 outer-dual-light SFP cage, prevent light leakage and panel misalignment, and match VOOHU SFP+ and SFP28 products to the enclosure.

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