Transformer products
The fifth pin brings out a tap partway along a winding, which is what a balanced feed or a phase-splitting stage needs. Check which winding the tap belongs to before you lay out the board, then compare impedance, turns ratio and dielectric strength across candidates.
Part number search & selector
Filter 5-pin audio transformers by hi-pot, turns ratio and DC resistance, then size, rated impedance ratio and insertion loss.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
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Pins
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L/W/H(mm*mm*mm)
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AC impedance PRI:SEC(Ω)
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DC resistance PRI:SEC(Ω)
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Turn Ratio(PRI:SEC)
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Mounting Method
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Hi-Pot(AC)
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Insertion Loss（dB）
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Insertion Loss (dB)
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| Image | Part number | Datasheet | Compare | Downloads | Pins | L/W/H(mm*mm*mm) | AC impedance PRI:SEC(Ω) | DC resistance PRI:SEC(Ω) | Turn Ratio(PRI:SEC) | Mounting Method | Hi-Pot(AC) | Insertion Loss（dB） | Insertion Loss (dB) | Sample |
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WHTT5005 | SPEC | 5 PIN | 14.5*8.2*5 | 600：600 | 65：75 | 1±2% | SMD | 1000V | — | 1.3 |
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WHTT5003 | SPEC | 5 PIN | 14.5*8.5*5.08 | None | 45：55 | 1±1% | SMD | 500V | - | — |
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WHTT5002 | SPEC | 5 PIN | 14.5*8.5*5.08 | 600：460 | 90.5：112：102 | 1±1% | SMD | 500V | - | — |
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WHTT5001 | SPEC | 5 PIN | 14.5*8.2*4.8 | 600：365 | 138：130 | 1±1% | SMD | 1000V | 2.8 | — |
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WHTT5000 | SPEC | 5 PIN | 14.5*8.2*4.8 | 300:600 | 120：250 | 2±1% | SMD | 1000V | - | — |
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By pin count
Pin count sets the winding taps and the board footprint, so start from the circuit you have.
Series overview
A 5-pin audio transformer is a surface-mount audio or line transformer with one extra pin, a tap on one winding, for circuits that need a midpoint. It is also called a center tap audio transformer. All share a 14.5 mm body length, with widths of 8.2 or 8.5 mm, heights of 4.8 mm to 5.08 mm and 500 VAC or 1,000 VAC hi-pot. For plain two-winding coupling see 4-pin audio transformers; for taps on both windings see 6-pin audio transformers.
WHTT5005, WHTT5001 and WHTT5000 list 1,000 VAC hi-pot, and WHTT5003 and WHTT5002 list 500 VAC. If the tapped winding faces an external line or another ground, an audio isolation transformer rated 1,000 VAC is the place to start.
WHTT5003, WHTT5002 and WHTT5001 are 1:1 at ±1%, WHTT5005 at ±2%. WHTT5000 lists a ratio of 2 at ±1% and a rated impedance ratio of 300:600 in the selector; confirm its winding direction before layout.
DC resistance is 45 Ω and 55 Ω for WHTT5003, 65 Ω and 75 Ω for WHTT5005, 138 Ω and 130 Ω for WHTT5001 and 120 Ω and 250 Ω for WHTT5000; WHTT5002 lists one figure per winding section.
WHTT5001 and WHTT5000 measure 14.5 × 8.2 × 4.8 mm, WHTT5005 14.5 × 8.2 × 5 mm, and WHTT5003 and WHTT5002 14.5 × 8.5 × 5.08 mm. Pad layouts may still differ, so use each datasheet’s footprint.
Applications
These parts sit where a circuit needs a midpoint.
Paging and conference amplifiers drive long balanced lines; a center tap transformer with the tap grounded gives both legs a common reference. WHTT5001, 1:1 with 1,000 VAC hi-pot, is one candidate; check where its tap sits.
Telephone and intercom interfaces use a tapped telecom transformer to feed loop current or build a two-wire to four-wire hybrid. Before routing DC through the tap, confirm the datasheet allows it and the halves stay balanced.
A 5-pin audio transformer on a microphone input that carries 48 V phantom power needs care with taps and DC. Our phantom power article explains which connections pass phantom, which block it and what a tap changes.
Documents
Search by part number to download each audio transformer datasheet, 3D model and PCB footprint, then confirm which winding carries the tap before routing.
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 manufactures audio transformers in its own magnetics factory in Mianyang. Each 5-pin part has a datasheet, 3D model and PCB footprint, so you can check where the tap lands on your board.
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, give part number, yearly quantity and target delivery month; typical lead time is 7–10 days.
Send the part number and datasheet of the tapped audio transformer you want to replace. Our FAE team compares turns ratio, tap position, DC resistance, hi-pot and footprint, then suggests 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. Every 5-pin audio transformer here is produced in Mianyang.
FAQ
Manufacturing, DC resistance figures and the step to 6-pin parts.
It brings out a tap partway along one of the windings, most often the centre. A centre tap gives you a reference point between the two halves of a winding, which is what balanced drive and phase-splitting stages rely on. Which winding carries the tap varies by part, so read the pinout.
That depends on the part number and must be read from the datasheet pinout. It is not something you can infer from the package. Assuming the tap sits on the wrong winding will put the reference point in the wrong place and the stage will not behave as the schematic expects.
No. If the circuit does not need it, the tap can be left unconnected and the part behaves as a two-winding transformer. Keep the unused pin isolated from adjacent nets on the board, and confirm from the datasheet that the part permits leaving it open.
Electrically the windings do the same job. The difference is access: five pins expose a tap that four pins do not. If the schematic has no node that needs the tap, a four-pin part is simpler to lay out. Compare impedance, turns ratio and dielectric strength either way.
With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the source and load impedance, signal level, frequency range and whether you need a centre tap, and a sales engineer will confirm candidates.
VOOHU does. It manufactures them in its own magnetics factory in Mianyang, China, alongside 4-pin and 6-pin types; quote the full part number when you request samples, since each has its own datasheet.
A tap on one winding leaves three sections to measure, so the selector gives 90.5 Ω, 112 Ω and 102 Ω for WHTT5002. Match each figure to its pins in the datasheet before estimating losses or tap balance.
When both windings need a tap, for example a balanced input and a balanced output on one part; a 5-pin part taps one winding only. Our 6-pin audio transformer page also lists parts with higher hi-pot ratings.
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.
