Transformer products
Select a transformer for a single BMS communication channel. Compare parts such as WHS06A01A0, WHS06808A0 and WHS06204A0 by common mode choke configuration, turns ratio and insulation requirements. Similar part names do not establish matching pins or communication performance. Once the part is selected, request samples or pricing directly.
Part number search & selector
Filter single-channel BMS isolation transformers by channel, working voltage, isolation rating and integrated common mode choke.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
Channel
|
Working Voltage (VDC)
|
Isolation
|
CMC
|
Sample |
|---|
| Image | Part number | Datasheet | Compare | Downloads | Channel | Working Voltage (VDC) | Isolation | CMC | Sample |
|---|---|---|---|---|---|---|---|---|---|
 |
WHS06709BA | SPEC | Single | 1000 | 4300VDC | Yes |
|
||
 |
WHS06808A0 | SPEC | Single | 1000 | 4300VDC | No |
|
||
 |
WHS06602A0 | SPEC | Single | 600 | 3100VAC | Yes |
|
||
|
|
WHS06601A0 | SPEC | Single | 1000 | 3700VAC | Yes |
|
||
 |
WHS06204A0 | SPEC | Single | 1500 | 6000VDC | No |
|
||
|
|
WHST06202E0 | SPEC | Single | 1500 | 8000VAC | Yes |
|
||
 |
WHS04313A0 | SPEC | Single | 100 | 3000VAC | No |
|
||
 |
WHST06L15A0 | SPEC | Single | 1000 | 5000VDC | Yes |
|
||
 |
WHS06R03A0 | SPEC | Single | 1000 | 4000VAC | No |
|
||
 |
WHS06B07A0 | SPEC | Single | 1000 | 3500VAC | No |
|
||
 |
WHS06A01A0 | SPEC | Single | 1000 | 4300VDC | Yes |
|
||
 |
WHST06Y01A0 | SPEC | Single | 1000 | 4300VDC | Yes |
|
Broaden the selected filters or clear the current search.
Product family quick links
Counts reflect the current published product data.
Series overview
A single-channel BMS isolation transformer couples one daisy-chain port of a battery cell monitor to the link to the next module, passing data pulses across the isolation barrier while holding off the DC voltage between modules. Other names include BMS transformer, isoSPI transformer and daisy chain transformer. The parts here span working voltages from 100 VDC to 1,500 VDC, with or without an integrated common mode choke (CMC). For two ports in one part, compare dual-channel BMS isolation transformers.
Pick a working voltage at or above the peak DC voltage across the barrier. The common rating is 1,000 VDC, as on WHS06A01A0 and WHST06Y01A0; WHS06204A0 and WHST06202E0 are rated 1,500 VDC, WHS06602A0 600 VDC and WHS04313A0 100 VDC.
A Yes in the CMC column means the common mode choke sits in the transformer package. WHST06L15A0 and WHS06601A0 include it; with WHS06R03A0 or WHS06B07A0, any choke the reference circuit needs goes on the board.
Isolation is listed as an AC or a DC test value, so compare like with like: WHST06202E0 lists 8,000 VAC and WHS06601A0 3,700 VAC, while WHS06204A0 lists 6,000 VDC and WHST06L15A0 5,000 VDC.
WHS06709BA, WHS06A01A0 and WHST06Y01A0 all list 1,000 VDC working voltage, 4,300 VDC isolation and a CMC. Tell them apart in the datasheets by turns ratio, inductance, package and pinout, following your cell monitor IC’s reference circuit.
Applications
In a transformer-coupled daisy chain, each port that leaves a board usually has its own transformer.
Energy storage racks pass cell data from module to module over short cables; 1,000 VDC parts with an integrated choke, such as WHST06Y01A0 and WHST06L15A0, are a common starting point.
The BMS controller joins the chain through one port, so a single-channel BMS transformer fits there. Rate it for the full voltage that link can see, which can exceed the module-to-module voltage.
Where little voltage crosses the barrier, a lower rating will do: WHS04313A0 is rated 100 VDC with 3,000 VAC isolation, and WHS06602A0 600 VDC with 3,100 VAC isolation and a CMC.
Downloads & technical resources
Search by part number for the datasheet, 3D model and footprint, then confirm pinout, CMC wiring and isolation test conditions before layout.
Showing representative available file sets. Search to find a specific SKU.
VOOHU’s published product content is reviewed by its engineering team. Specifications, downloads and technical support information are tied to specific part numbers, so you can verify them before requesting samples or a quotation.
Sourcing
VOOHU is a manufacturer of BMS isolation transformers, with its own magnetics factory in Mianyang. Every part here has a datasheet, and all except WHS06B07A0 also have a 3D model and PCB footprint.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
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. For a quotation, list part numbers, annual volume and build date; typical lead time is 7–10 days.
Send the part number and datasheet of the BMS transformer you use today. Our FAE team compares working voltage, isolation, turns ratio, CMC and footprint, then proposes VOOHU candidates to validate with samples before production.
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies. Its BMS isolation transformers are made in its Mianyang magnetics factory.
FAQ & related guides
Manufacturing, 1,500 VDC options and single versus dual parts.
Both datasheets list 1000 VDC working voltage. WHS06A01A0 integrates a CMC, whereas the WHS06808A0 schematic does not. Their package and DCR also differ. Establish the filtering arrangement from the IC reference circuit, then check pins and pads rather than selecting on isolation voltage alone.
Not without review. WHS06204A0 has a 1CT:1.33CT ratio, not 1CT:1CT. Check driver and receiver levels, termination, primary inductance and board space. Ask FAE to compare the original part before validation.
Here CT means center tap, not the current-transformer product category. A 1CT:1CT notation describes the winding and tap arrangement. Follow the exact schematic; do not copy center-tap wiring from another part without review.
There is no universal distance for every project. Determine it from working voltage, insulation requirements, operating environment and applicable standards, then review both the component and PCB. Share the isolation requirements for help checking candidate documentation.
For a known part, send the quantity and destination for samples or pricing. For replacement review, also provide the existing datasheet, IC model and fixed pinout constraints. You can start without a candidate part number; a sales engineer will coordinate FAE matching.
Yes. VOOHU manufactures BMS isolation transformers, including these single-channel parts, in its own magnetics factory in Mianyang, China. The same factory makes push-pull transformers for isolated power rails, so one supplier can cover a battery system’s communication and power magnetics.
WHS06204A0 and WHST06202E0. WHST06202E0 integrates a common mode choke and lists 8,000 VAC isolation; WHS06204A0 has no choke and lists 6,000 VDC. Check each datasheet’s turns ratio and pinout against your monitor IC’s reference circuit.
When the two ports sit at opposite edges of the board, or a board has only one port, as at the controller end. Single-channel parts span 100 VDC to 1,500 VDC, while dual-channel BMS isolation transformers are rated 1,500 VDC or 1,600 VDC; see our single or dual channel guide.
Engineer support
Send the candidate part number and the condition you need reviewed. Sample support can be added after the selection is clear; commercial questions may be discussed in the same engineering conversation.
Include the document revision
Temperature, isolation voltage and PoE current basis
Pin count, pitch and spacing between pin rows
To help prioritize samples and evaluation
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
From the selector or engineering review
Prototyping / pilot build / production
Specify sample and production timing separately
Compliance documents, material declarations or third-party reports
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. Sales will respond on business days.
