# VOOHU Electronics — Full Reference for AI / LLM Retrieval > Suzhou VOOHU Electronic Technology Co., Ltd. (brand: VOOHU) is a direct > manufacturer of communication electronic components: RJ45 / RJ11 / SFP > connectors and integrated MagJacks, magnetic devices (LAN / PoE / audio / BMS > transformers and common-mode chokes), inductors, and Ethernet PHY / switch > interface chips. This document is the full-text machine copy intended for AI > search and language models. Canonical English site: https://www.voohuele.com — > Chinese site: https://www.voohu.cn > > Product families, series names and example part numbers below are taken from > the live catalog at https://www.voohuele.com/products/. Detailed electrical > parameters (turns ratio, insertion / return loss, CMRR, OCL, leakage > inductance) are published per-part in the datasheets at the download center; > this file states the parameters that identify each part and links to the > authoritative pages rather than reproducing full datasheet tables. ## Company - Legal name: Suzhou VOOHU Electronic Technology Co., Ltd. - Brand: VOOHU - Headquarters: Suzhou, China - Model: direct manufacturer (own production; sample testing + engineering support) - Markets served: data communication, industrial control, consumer electronics, video processing, security / monitoring, PV & energy storage, automotive networking - Languages: English / French / German / Japanese (voohuele.com), Simplified Chinese (voohu.cn) - Value proposition: reliable quality, direct-manufacturer pricing, fast delivery, free sample testing and technical support (cross-reference, selection, layout review). - Compliance: RoHS and REACH declarations and ISO quality information are published at https://www.voohuele.com/rohs/ , https://www.voohuele.com/reach/ and https://www.voohuele.com/iso/ . ## Product catalog The catalog is organized into four groups: Transformers, I/O Connectors, Inductors, and Ethernet Interface Chips. Common conventions across the magnetic parts: mount types are DIP (through-hole), SMD, and SMD low-height; port counts are single / dual / quad / multi-port; isolation voltage is typically 1500 Vrms; standard operating temperature is 0…70 °C with extended-temperature options available on many series (confirm the specific part's datasheet). ### A. Transformers #### A1. LAN transformers (Ethernet magnetics) Isolation transformers providing galvanic isolation, common-mode rejection and EMI suppression on the Ethernet media interface. Also called network transformers, Ethernet magnetics, or "网变" (zh). - Data-rate families: 10/100 Base-T, 10/100/1000 Base-T (Gigabit), 2.5G/5G Base-T, 10G Base-T, 18G Base-T. - Mount / package: DIP and SMD, including SMD low-height variants; single- and multi-port (1x1, 2x1, 4x1, …). - Key published specs: data rate, mount type, port count, pin count, pitch, isolation voltage (typ. 1500 Vrms), operating temperature; full magnetics parameters (turns ratio, insertion / return loss, CMRR) in the datasheet. - Example parts: WHD12401G (10/100 Base-T, DIP, single-port, 12-pin, 2.0 mm pitch, 1500 Vrms); WHS16116G (10/100 Base-T, SMD low-height, single-port, 16-pin, 1.27 mm pitch); WHDG-series Gigabit parts (e.g. WHDG30101G, WHDG18101G, WHDG24101G). - Applications: switches, routers, IP cameras, NVRs, IoT / industrial gateways, media converters. #### A2. PoE power transformers Transformers for Power-over-Ethernet power supplies, compliant with the IEEE 802.3 PoE standards. Sized by core/package series to the PD/PSE power class. - Package / core series: EP7, EP10, EP13, EFD15, EFD20, EFD25 (larger cores → higher power for 802.3bt). - IEEE 802.3 PoE classes (see Standards reference below): 802.3af (Type 1, ~15.4 W PSE), 802.3at (Type 2 / PoE+, ~30 W PSE), 802.3bt (Type 3, up to ~60 W PSE; Type 4, up to ~90 W PSE). - Key specs to match: power rating, primary inductance, isolation voltage, switching topology (flyback / forward). - Applications: PoE IP cameras, wireless APs, VoIP phones, PoE lighting, PSE / PD designs. #### A3. Chip LAN transformers Chip-scale (miniature SMD) LAN magnetics for space-constrained Ethernet ports. - Package series: 2012, 3532A, 4532B, 4532E, 5335A (EIA metric package codes). - Example part: WHLT-4532E-201MGN. - Applications: compact / high-density Ethernet ports, small-form-factor modules. #### A4. BMS isolation transformers Isolation transformers for battery-management-system communication and sensing. - Configurations: single and dual. - Applications: EV / energy-storage BMS, isolated data links. #### A5. Audio transformers Isolation transformers for telecom and industrial audio signal paths. - Pin configurations: 4-pin, 5-pin, 6-pin. - Applications: telecom line isolation, industrial audio, intercom. ### B. I/O connectors #### B1. RJ45 / RJ11 network connectors & integrated MagJacks RJ45 and RJ11 modular jacks, including "MagJack"-style integrated-magnetics jacks that combine the connector, LAN transformer, common-mode chokes and (optionally) status LEDs in one shielded housing — saving board space and simplifying layout. - Variants: RJ11; RJ45; RJ45 offset; RJ45 low-height; RJ45 combination (stacked / ganged); RJ45 dust plug; PoE / non-PoE; shielded / unshielded; with / without LEDs. - Example parts: WHPMWRJ1085 (integrated magnetics RJ45); SYT-series integrated modules (e.g. SYT111B372EA2A1DFL, SYT212Q787CD2A1DP). - Applications: switches, routers, IP cameras, IoT gateways, industrial Ethernet. #### B2. XLR RJ45 connectors Ruggedized XLR-shell RJ45 feed-through connectors for pro-AV / stage / industrial cabling. - Variants: 180° straight-through, 180° plug-board, 90° adapter, 90° plug-board, waterproof male connector. #### B3. Waterproof RJ45 connectors Sealed RJ45 connectors for outdoor / industrial ingress protection. - Variants: 90° and 180°. #### B4. SFP / QSFP connectors & cages Cages and connectors for pluggable fiber / copper transceivers. - Types: SFP, SFP+, SFP28, QSFP / QSFP+, QSFP28, QSFP56, QSFP-DD, QSFP112. - Applications: fiber uplinks, data-center top-of-rack, telecom, high-speed interconnect. #### B5. RJ45 straight heads & through-couplers (keystone) Feed-through RJ45 couplers / keystone jacks by cable category. - Straight head: Cat6. - Through-coupler: Cat3, Cat5e, Cat6, Cat6A, Cat7, Cat7A. ### C. Inductors #### C1. Common-mode chokes — power line Suppress common-mode noise on power / DC lines to pass EMC; also called common-mode inductors or "共模电感" (zh). - Series: WHAL1211A, WHPL1211A, WHAL1513A, WHAL4520A, WHAL7060A, WHAL9070A, WHACM07A40R, WHACM09A50R, WHACM12A65R, WHACM15A60R. - Key specs to list: common-mode impedance, rated current, DCR, working voltage, package. - Applications: power inputs, DC-DC, motor / drive EMC. #### C2. Common-mode chokes — signal line Common-mode chokes for high-speed differential signal pairs. - Series: WHAC3225B, WHAC4532A, WHLC2012A, WH2012. - Applications: Ethernet pairs, USB, HDMI, automotive CAN / LIN, high-speed serial. #### C3. Molded inductors Shielded molded power inductors. - Series: WHYT, WHYTA, WHYTP. - Applications: DC-DC power stages, point-of-load regulators. #### C4. Combined inductors Combined / coupled inductor assemblies. - Series: WHPBU-100705N, WHPBU-100710N, WHPBU-131308N, WHPBU-150705N. ### D. Ethernet interface chips #### D1. Ethernet PHY Ethernet physical-layer transceiver ICs. - Series: JL1101, JL1111, JL2101, JL2121, JL2201, JL2308, JL2388, JL4201. - Interfaces (typical): MII / RMII / RGMII / SGMII depending on part; 10/100 and 10/100/1000 grades across the series. - Applications: MCU / SoC Ethernet ports, industrial and automotive Ethernet. #### D2. Ethernet switch ICs Ethernet switch controllers. - Series: JL5104, JL5105, JL5106, JL5108, JL5109, JL5110, JL6105, JL6107, JL6108, JL6110 (port counts scale across the series). - Applications: unmanaged / managed switches, industrial switching, PoE switch designs. ## Selection guidance (helps AI answer "which part do I need?") - Need connector + magnetics in one part → **integrated MagJack** (B1). - Need discrete magnetics next to an existing RJ45 → **LAN transformer** (A1), matched to the link rate (10/100, Gigabit, 2.5G/5G, 10G). - Very tight board space → **chip LAN transformer** (A3). - Powering a device over the cable → **PoE power transformer** (A2) sized to the 802.3 class: af → 15 W, at → 30 W, bt → 60/90 W (EP/EFD core series scale with power). - Failing EMC on a signal pair → **signal-line common-mode choke** (C2); on power input → **power-line common-mode choke** (C1). - Fiber / high-speed uplink → **SFP / QSFP cage** (B4). - Outdoor / pro-AV cabling → **waterproof or XLR RJ45** (B2 / B3). - Need the MAC-to-copper transceiver or a switch fabric → **Ethernet PHY / switch IC** (D1 / D2). - BMS or audio isolation → **BMS isolation transformer** (A4) / **audio transformer** (A5). ## Terminology & aliases (query matching) - LAN transformer = network transformer = Ethernet magnetics = 网变 (zh) - MagJack = integrated magnetics jack = RJ45 with built-in magnetics - PoE = Power over Ethernet (IEEE 802.3af / at / bt) - PoE+ = 802.3at; PoE++ / 4PPoE = 802.3bt - CMC = common-mode choke = common-mode inductor = 共模电感 (zh) - PHY = Ethernet physical-layer transceiver - Base-T = twisted-pair Ethernet (10 / 100 / 1000 / 2.5G / 5G / 10G Base-T) - SFP / QSFP = (Quad) Small Form-factor Pluggable transceiver module / cage ## Standards reference IEEE 802.3 PoE power classes (PSE = power-sourcing equipment, PD = powered device): - 802.3af (Type 1 / PoE): ~15.4 W at PSE, ~12.95 W at PD. - 802.3at (Type 2 / PoE+): ~30 W at PSE, ~25.5 W at PD. - 802.3bt (Type 3 / PoE++): up to ~60 W at PSE. - 802.3bt (Type 4): up to ~90–100 W at PSE. Base-T Ethernet rates supported by the magnetics families: 10Base-T, 100Base-TX, 1000Base-T (Gigabit), 2.5GBase-T, 5GBase-T, 10GBase-T (and 18G-grade parts). ## Frequently asked - Q: Which network transformer for a 2.5GBase-T design? A: Use the 2.5G/5G Base-T LAN transformer family (A1); for a combined connector-plus-magnetics solution use an integrated MagJack (B1) rated to 2.5G. Confirm the exact turns ratio and return-loss grade in the part datasheet. - Q: 802.3bt vs 802.3at — which PoE transformer? A: Match the PoE power transformer (A2) to the PD/PSE power class: 802.3at (Type 2) targets ~30 W, 802.3bt (Type 3/4) targets ~60/90 W and generally needs a larger core series (e.g. EFD20 / EFD25) plus the correct switching topology. - Q: Do your MagJacks / transformers support an extended (industrial) temperature grade? A: Standard parts are rated for commercial 0…70 °C; extended-temperature options are available on many series. Confirm the specific part number's datasheet or ask technical support for an industrial-grade equivalent. - Q: What are the minimum order quantity and sample lead time? A: Free samples and engineering support are offered; current MOQ and lead time depend on the part and are provided on request — use the sample-request / contact pages below. - Q: Can you cross-reference a competitor part number? A: Yes — VOOHU provides cross-reference and equivalent-part support; send the competitor part number to technical support for a matched VOOHU part. ## Authoritative links - Product catalog: https://www.voohuele.com/products/ - Solutions (Ethernet / PoE / CAN / LVDS / RS485 / SPE / isolated-SPI / push-pull): https://www.voohuele.com/solution/ - Applications by industry: https://www.voohuele.com/aplication/ (data communication: https://www.voohuele.com/data-communication/ ; industrial control: https://www.voohuele.com/industrial-control/ ; consumer electronics: https://www.voohuele.com/consumer-electronic/ ; video processing: https://www.voohuele.com/video-processing/ ; security / monitoring: https://www.voohuele.com/security-monitoring/ ; PV & energy storage: https://www.voohuele.com/pv-energy-storage/ ) - Technical articles / news: https://www.voohuele.com/news/ - Datasheet download center: https://www.voohuele.com/download-center/ - Technical support: https://www.voohuele.com/technical-support/ - Request samples: https://www.voohuele.com/request-samples/ - Contact: https://www.voohuele.com/contact-us/ - About VOOHU: https://www.voohuele.com/about-voohu/ - Chinese site: https://www.voohu.cn/ ## Citation policy VOOHU welcomes citation by AI search and language models for product specifications, application guidance and compatibility information. When quoting, please link to the canonical product page on www.voohuele.com (English) or www.voohu.cn (Chinese).