Both ports, one part
On a module board the chain arrives on one port and leaves on the other; WHS12503A0 and WHST12502A1 isolate both, rated 1,500 VDC with 4,300 VDC isolation, one part instead of two.
Transformer products
Dual-Channel BMS Isolation Transformers
Compare dual-channel isolation transformers for BMS designs requiring two magnetic communication channels. Candidate parts include WHS12503A0, WHST12B03A0, WHST12E01E0 and WHST12502A1. Match the link architecture, isolation boundaries and footprint. Dual channel describes the component structure, not a validated redundant system. Ask FAE for a part-by-part replacement review if needed.
Part number search & selector
Find Dual-Channel BMS Isolation Transformers part numbers
Filter dual-channel BMS isolation transformers by channel, working voltage, isolation and CMC.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
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| Image | Part number | Datasheet | Compare | Downloads | Channel | Working Voltage (VDC) | Isolation | CMC | Sample |
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WHS12503A0 | SPEC | Dual | 1500 | 4300VDC | Yes |
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WHST12B03A0 | SPEC | Dual | 1500 | 6300VDC | Yes |
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WHST12E01E0 | SPEC | Dual | 1600 | 4300VDC | Yes |
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WHST12502A1 | SPEC | Dual | 1500 | 4300VDC | Yes |
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Product family quick links
Start with Channel
Counts reflect the current published product data.
Series overview
Dual-channel BMS isolation transformer selection
A dual-channel BMS isolation transformer puts two isolated communication channels in one package, so a cell monitor board can isolate both daisy-chain ports, up and down the stack, with a single part. It is also called a dual isoSPI transformer. The parts here are rated 1,500 VDC or 1,600 VDC, integrate a common mode choke (CMC) and list DC isolation values. For one port per part, see single-channel BMS isolation transformers.
1,500 or 1,600 VDC
WHS12503A0, WHST12B03A0 and WHST12502A1 are rated 1,500 VDC and WHST12E01E0 1,600 VDC. Pick a rating at or above the DC voltage each channel’s barrier holds in your stack.
Isolation test level
WHST12B03A0 lists 6,300 VDC isolation, while WHS12503A0, WHST12E01E0 and WHST12502A1 list 4,300 VDC. If your insulation design needs the higher hipot level, start with WHST12B03A0 and check its test time and leakage current.
Choke built in
The CMC column reads Yes for every dual part, so the common mode choke sits in the package; check how it connects on each channel and whether your monitor IC’s reference circuit expects it.
Applications
Dual-channel BMS isolation transformers in battery systems
Two channels in one body suit boards that end two daisy-chain links.
Cell monitor boards in a stack
Each module board takes the chain from below and passes it on above; one dual-channel part such as WHST12502A1 isolates both links, with the same port layout on every board.
Loop-back daisy chains
Some designs route the chain back to the controller so it can reach every module from either end. The controller then ends two links, and WHS12503A0 can isolate both.
High-voltage storage strings
Strings built on 1,500 VDC architectures need isolation matched to what each link sees; WHST12B03A0 pairs 1,500 VDC with 6,300 VDC isolation, and WHST12E01E0 is rated 1,600 VDC.
Downloads & technical resources
Dual-channel BMS isolation transformer design files
Search by part number for each BMS transformer datasheet, plus the 3D model and footprint where available, then check channel pinout before layout.
Showing representative available file sets. Search to find a specific SKU.
- 4
- PDF datasheets listed
- 3
- 3D file sets listed
- 3
- PCB footprints listed
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
Ordering dual-channel BMS isolation transformers
VOOHU manufactures dual-channel BMS isolation transformers in its own magnetics factory in Mianyang. Each part has a datasheet, and all except WHST12E01E0 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 and quotation requests
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, send part number, yearly quantity and pilot build date; typical lead time is 7–10 days.
Moving from another dual part
Send the part number and datasheet of the dual-channel BMS transformer you use now. Our FAE team checks working voltage, isolation, CMC, pinout and footprint, then suggests VOOHU candidates to validate with samples before production.
Quality and track record
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies. Dual-channel parts are produced in Mianyang.
FAQ & related guides
Dual-channel BMS isolation transformer FAQ
Manufacturing, look-alike parts and design files.
Does a dual-channel BMS transformer provide redundant communication by itself?
It does not provide a complete redundancy function. The component supplies two magnetic channels; redundancy depends on IC ports, cabling, topology, software and fault diagnostics. Evaluate the system architecture rather than treating channel count as a functional-safety conclusion.
Can a dual-channel transformer directly replace two single-channel parts?
Not automatically. Compare each channel’s electrical characteristics, CMC arrangement, isolation terminals, layout distances and pin connections. Changing the component count also changes PCB layout. Share the existing design for matching.
Is the 1600 VDC specification of WHST12E01E0 a hipot rating?
No. The current datasheet lists 1600 VDC as working voltage. Hipot is specified separately, including a 4300 VDC, 1 mA, 60 s condition. Also confirm the required insulation type and PCB conditions; the hipot figure cannot replace a working-voltage requirement.
The WHS12503A0 datasheet says 10/100Base-TX. Does that establish compatibility with any BMS?
No. The document also states BMS Application, so the intended interface must be checked rather than inferred from the title. Share the BMS IC, required turns ratio, link and insulation conditions so FAE can confirm the applicable document revision and candidate match.
How do I request a quote or custom review for a dual-channel BMS transformer?
For a selected part, request pricing with the number and quantity. Otherwise, start with the IC, two-channel connections and space constraints. Sales coordinates FAE review for replacement or customization, and confirms pricing and timing against the agreed part and project requirements.
Does VOOHU make its own dual-channel BMS isolation transformers?
Yes. VOOHU manufactures them in its own magnetics factory in Mianyang, China, together with the single-channel versions, so one FAE team can review a design that mixes both types.
How do WHS12503A0 and WHST12502A1 differ?
Not in the selector: both list 1,500 VDC, 4,300 VDC isolation and a CMC. Separate them by turns ratio, inductance, pinout and package in the datasheets, and by your monitor IC’s reference circuit.
Which dual-channel parts have 3D models and PCB footprints?
WHS12503A0, WHST12B03A0 and WHST12502A1 have a datasheet, 3D model and PCB footprint. WHST12E01E0 has a datasheet only, so build its land pattern from the datasheet dimensions or ask our FAE team to check it.
Engineer support
Dual-channel BMS isolation transformer samples and reviews
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.
- 1Selected part numbers
- 2Engineering review
- 3Sample request
- 4Commercial discussion
For a replacement review
- Original part and datasheet
Include the document revision
- Operating conditions
Temperature, isolation voltage and PoE current basis
- Package constraints
Pin count, pitch and spacing between pin rows
- Project stage and annual volume
To help prioritize samples and evaluation
- Target review date
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
For samples and a quotation
- Candidate part numbers
From the selector or engineering review
- Quantity and project stage
Prototyping / pilot build / production
- Required delivery date
Specify sample and production timing separately
- Required documentation
Compliance documents, material declarations or third-party reports
Samples are free of charge. Sample quantity and lead time depend on the part number and project stage. Sales will respond on business days.
