Power levels
Listed power runs from 3 W on WHEP7089 to 15 W on WHEP7927, with ST0873WH at 10 W and ST0874WH, ST0871WH and ST-0880WHB at 12 W. Size from the measured load and startup peaks, with margin.
Transformer products
EP7 PoE Power Transformers
Find EP7 candidates for the isolated DC-DC stage of your PoE powered device. Define the required supply rail and load, then check the windings, drive conditions and board space for each complete part number. Request samples or pricing for a known part, or ask your sales engineer to coordinate FAE matching for an existing component.
Part number search & selector
Find EP7 PoE Power Transformers part numbers
Filter EP7 PoE transformers by package size, power, output voltage and output current band.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
Package Size
|
Power (W)
|
Output Voltage (V)
|
Output Current (A)
|
Sample |
|---|
| Image | Part number | Datasheet | Compare | Downloads | Package Size | Power (W) | Output Voltage (V) | Output Current (A) | Sample |
|---|---|---|---|---|---|---|---|---|---|
 |
WHEP7089 | SPEC | EP7 Series | 3W | 12V | 0.25A |
|
||
 |
ST-0880WHB | SPEC | EP7 Series | 12W | 5V | ≥ 2A |
|
||
 |
WHEP7927 | SPEC | EP7 Series | 15W | 12V | 1.08A~1.99A |
|
||
|
|
ST0874WH | SPEC | EP7 Series | 12W | 12V | 0.41A~1.0A |
|
||
|
|
ST0873WH | SPEC | EP7 Series | 10W | 12V | 0.41A~1.0A |
|
||
|
|
ST0871WH | SPEC | EP7 Series | 12W | 13V | 0.41A~1.0A |
|
No matching part numbers
Broaden the selected filters or clear the current search.
Product family quick links
Start with Package Size
Counts reflect the current published product data.
Series overview
EP7 PoE transformers for 3–15 W designs
An EP7 PoE transformer is the transformer in the isolated DC-DC converter of a PoE powered device, turning port power into the device’s supply rail. It is also listed as an EP7 PoE power transformer or PoE PD transformer. Parts here run from 3 W to 15 W with 5 V, 12 V or 13 V outputs; for similar power in another core, see the EP10 PoE transformer page.
Matching the output rail
WHEP7089, ST0873WH, ST0874WH and WHEP7927 are listed for 12 V, ST0871WH for 13 V and ST-0880WHB for 5 V. A 13 V part is its own winding design, not a 12 V part with headroom.
Reading the current column
Treat output current as a filter, not a continuous rating: WHEP7089 is listed at 0.25 A, ST0871WH, ST0873WH and ST0874WH at 0.41–1.0 A, WHEP7927 at 1.08–1.99 A and ST-0880WHB at ≥ 2 A. Confirm on the datasheet.
Windings and pins
Each EP7 transformer has its own winding diagram and pin map, even where its power or voltage label matches another part. Check which secondary pins the drawing joins, and the polarity marks, before routing.
Applications
Typical uses for EP7 PoE transformers
EP7 parts suit powered devices that need 3 W to 15 W from the converter.
Sensors, readers and IoT nodes
Occupancy sensors, card readers and small IoT nodes draw little power from the port. WHEP7089, a 3 W EP7 flyback transformer with a 12 V, 0.25 A output, suits loads this small.
IP cameras and access points
Fixed IP cameras and indoor access points often run on 12 V, which ST0874WH covers at 12 W; ST0871WH gives 13 V at 12 W where the board expects it.
5 V boards and PoE splitters
Single-board computers and 5 V PoE splitters need a 5 V rail at higher current. ST-0880WHB is listed for 5 V at 12 W in the ≥ 2 A band, so review secondary copper loss early.
Downloads & technical resources
EP7 PoE transformer datasheets, 3D models and footprints
Search by part number for the EP7 transformer datasheet, 3D model and PCB footprint; check windings, pins and outline before layout.
Showing representative available file sets. Search to find a specific SKU.
- 6
- PDF datasheets listed
- 6
- 3D file sets listed
- 6
- 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
Sourcing EP7 PoE transformers from VOOHU
VOOHU is a manufacturer of PoE power transformers, with its own magnetics factory in Mianyang. A datasheet, 3D model and PCB footprint are published for each EP7 part number here.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples and quotations
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 the part numbers and annual volume; typical lead time is 7–10 days.
Replacing another PD transformer
To replace a PD transformer you use today, send its part number and datasheet. Our FAE team compares output rail, power, windings and footprint, then suggests EP7 candidates for you to validate with samples before production.
Quality and compliance
VOOHU is ISO 9001 and ISO 14001 certified. VOOHU’s PoE transformers are RoHS and REACH compliant (third-party test reports). Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies.
FAQ & related guides
Common questions on EP7 PoE transformers
Answers on manufacturing, power level choice and when to look beyond EP7.
How should I compare ST-0880WHB and WHEP7927?
Both diagrams label a 36–57 V input, with main-secondary labels of 5 V / 2.4 A and 12 V / 1.25 A, respectively. ST-0880WHB also lists 500 kHz. Start with the required rail, then check controller, windings, load and thermal conditions. Do not transfer one part's frequency or output label to the other.
Does EP7 mean a 7 mm outline?
No. EP7 is the family name; use the complete part's drawing to assess space. For example, the ST-0880WHB A1 drawing lists maximum A, B and C dimensions of 10.0, 10.5 and 9.0 mm. Read these with the corresponding views and check the land pattern, neighboring components and assembly space.
Are EP7 parts listed for 12 V directly interchangeable?
The family and voltage label are insufficient. Compare winding connections, parameter test conditions, pins and dimensions, and share the original circuit and datasheet. Your sales engineer can coordinate an FAE review of candidates, differences and sample-validation needs rather than treating a shared family as an automatic replacement.
What secondary-pin connections should I check for ST-0880WHB?
The A1 drawing requires pins 5 and 6 to be connected together, and pins 7 and 8 together, for the documented secondary arrangement. It does not call for all four pins to be shorted together. Check the bottom view, polarity and current document revision, and review connections again when changing parts rather than applying this rule to all EP7 products.
Do I need every design parameter before requesting EP7 samples?
For a known complete part number, request samples from the selector and tell your sales engineer the quantity, project stage and pricing needs. If the part is undecided, start with the application, required output and space constraints. Your sales engineer can coordinate the additional information needed for FAE review.
Is VOOHU an EP7 PoE transformer manufacturer?
Yes. VOOHU manufactures the EP7 PoE transformers on this page in its own magnetics factory in Mianyang, China, alongside its EP10, EP13 and EFD core sizes. Each part has a published datasheet, 3D model and PCB footprint.
Which 12 V EP7 part fits my power level?
WHEP7089 is listed at 3 W for very small loads. ST0873WH is listed at 10 W and ST0874WH at 12 W, both in the 0.41–1.0 A band, while WHEP7927 reaches 15 W at 1.08–1.99 A. Choose the one that still has margin at your maximum load and ambient temperature.
When should I look beyond EP7 to EP13?
When the load needs more than the 15 W listed for WHEP7927. EP13 PoE transformers are listed from 10 W to 30 W, with outputs from 5 V to 24 V. A new core means a new drawing and land pattern, so plan fresh samples.
Engineer support
EP7 PoE transformer samples and FAE 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.
- 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 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.
