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ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core

ModelZXY-EI25CategoryMicrophone Transformer

The ZXY-EI25 is a flying-lead audio isolation transformer built on an EI25 laminated core. Its two windings are isolated from each other and wound with a 1:4 turns ratio. At 1 kHz and 0.3 V, the primary inductance is 56 mH minimum and the secondary is 800 mH minimum; at 25 °C, the DC resistance is 1.6 Ω for the primary and 17 Ω for the secondary, with a tolerance of ±15%. The device covers the 50 Hz to 20 kHz band and is designed for low distortion within this range, which is why it is described as both a voice coupling transformer and a data coupling transformer.

耐压测试: 1,500 V, 1 mA, 60 s
耐压测试（2）: 1,500 V, 1 mA, 60 s
频率范围: 50 Hz 至 20 kHz

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Email:rhea@zxycoil.com

Description

1. Product Name

ZXY-EI25, a flying-lead audio isolation transformer built on an EI25 laminated core. The two windings are isolated from each other and wound with a 1:4 turns ratio. At 1 kHz and 0.3 V, the primary inductance is 56 mH minimum and the secondary is 800 mH minimum; at 25 °C, the DC resistance is 1.6 Ω for the primary and 17 Ω for the secondary, with a tolerance of ±15%. The device covers the 50 Hz to 20 kHz band and is designed for low distortion within this range, which is why it is described as a voice and data coupling transformer.

Single unit: laminated core, yellow-taped winding and flying leads

Two windings, one isolation barrier. The windings are separated from each other, so the signal can pass through while the ground path between two devices is not connected. This is the core function of the device: it eliminates AC hum induced on signal lines by system grounds and prevents a fault on one side from reaching the output stage on the other. Both windings are marked for polarity, defined by the schematic shown in the next section.

2. Construction and Materials

Core. EI25 laminated core, as specified in the datasheet. The inductance values cited on this page—56 mH min for the primary and 800 mH min for the secondary—are measured at 1 kHz and 0.3 V, and these figures are the criteria used to inspect incoming parts against.

Three-quarter view of the body, with the leads leaving the winding.

Windings and polarity. Two isolated windings with a 1:4 turns ratio. The datasheet defines polarity through an approved schematic, included with the product and shown below: a polarity dot is placed at the same end of each winding symbol, with the two windings on opposite sides of an insulation barrier. The source file does not assign lead colors to the windings, so the winding-to-color correspondence should be taken from the schematic supplied with the order, not from photographs.

Schematic and circuit structure: two isolated windings, polarity dot at the same end.

Termination. Flying leads with pre-tinned ends, so the device is wired into a harness or terminal block rather than reflow-soldered to pads. The tinned ends are solder-ready from the factory, eliminating the need to strip and re-tin on the workbench; the lead length provides routing freedom that pin-type devices do not offer. The source file does not state lead length or wire gauge, so these parameters are not cited on this page.

Callouts on the render: 1:4 turns ratio, pre-tinned flying leads — Callouts on the drawing: 1:4 turns ratio, pre-tinned flying leads

3. Feature

Flying-lead construction on an EI25 laminated core. The device connects via leads rather than a pad pattern, so the mounting position is determined by the harness, not by PCB pads.

1:4 turns ratio. The secondary has four times the turns of the primary, and the two windings are isolated from each other.

Inductance of 56 mH min and 800 mH min, at 1 kHz / 0.3 V. For the primary and secondary respectively, verified on both windings under the stated conditions.

DC resistance of 1.6 Ω and 17 Ω, at 25 °C, ±15%. For the primary and secondary respectively; the tolerance is stated, so delivered parts can be inspected against limits rather than nominal values.

Hi-pot 1,500 V, 1 mA, 60 s. Dielectric withstand test, including the stated voltage, leakage current limit, and duration.

Frequency range of 50 Hz to 20 kHz. Voice and program material fall within this band, which is why the device is described as a voice and data coupling transformer.

Two isolated windings with polarity marking. Polarity is defined by the approved circuit diagram, so phase consistency between units can be maintained in assembly.

Flying leads with pre-tinned ends. No stripping and re-tinning on the bench is required; the leads are solder-ready from the factory.

Low distortion across a wide frequency response. As stated in the source, a single part achieves both voice clarity and audio fidelity.

Body size 26.0 × 19.0 mm, height 14.8 mm. Per the outline drawing: compact enough to fit inside an audio module or behind a connector panel.

4. Advantage

Signal passes, ground does not. The isolated 1:4 winding transmits the signal while breaking the ground loop between two devices—this is the isolation barrier at work, not a filter.

Ground-loop hum eliminated at the source. AC hum from system grounds is blocked by the isolation barrier, not attenuated in downstream circuitry.

Front-end output stage is protected. A fault on one side does not reach the output stage of the other device, which is what the source means by burn-out prevention.

Both balanced and unbalanced lines are covered. External interference on either type of transmission line is suppressed by the same isolation barrier.

Lead-mounted, not SMD. Flying leads suit a wide range of wiring scenarios, a practical advantage over pin-type devices when the harness is already designed.

One part for both voice and data. A single 50 Hz to 20 kHz transformer handles both coupling tasks, so no second part is needed in the bill of materials.

Custom design on request. Alternative windings are available on request; the standard product in this series is the 1:4 version described above.

5. Application

Professional audio. Lavalier, camcorder, and instrument microphones, mic preamps, and audio isolation modules.

Audio systems. Hi-fi speakers, home theater, and car audio for signal isolation and noise elimination.

Communication equipment. Telephones, fax machines, VoIP terminals, and modems for signal coupling.

Industrial and broadcast systems. Public address and conference systems for audio isolation and transmission.

A single unit on a desk, beside a loudspeaker and an amplifier

The part on a signal board with XLR and RCA connectors, on a test bench

6. Specifications

The table below lists the ZXY-EI25 specifications stated in the source, i.e., for the ZXYEI25 flying-lead version. Where the source gives no value, the table notes this rather than introducing data from other series.

6.1 Summary

Item	Specification	Remarks
Model	ZXY-EI25 Flying-Lead	ZXYEI25 flying-lead version
Reference Part Number	B2316	Reference number given in the source; confirm at order placement
Core	EI25 laminated core	Stated as laminated
Turns Ratio	1:4	Two isolated windings
Inductance	56 mH min / 800 mH min	Primary / secondary, at 1 kHz and 0.3 V
DCR at 25 °C	1.6 Ω / 17 Ω	±15%, primary / secondary
Hi-Pot	1,500 V, 1 mA, 60 s	AC or DC not stated
Frequency Range	50 Hz to 20 kHz	Low-distortion design intent
Windings	Two isolated windings	Polarity marked per schematic
Terminals	Flying leads, pre-tinned ends	Lead length and wire gauge not stated
Body	26.0 × 19.0 mm, height 14.8 mm	Per outline drawing
Options	Custom design	Alternative windings available on request

6.2 Electrical

Parameter	Specification	Test Condition
Turns Ratio	1:4	Primary to secondary
Primary Inductance	56 mH minimum	At 1 kHz and 0.3 V
Secondary Inductance	800 mH minimum	At 1 kHz and 0.3 V
Primary DC Resistance	1.6 Ω ±15%	At 25 °C
Secondary DC Resistance	17 Ω ±15%	At 25 °C
Hi-Pot	1,500 V at 1 mA	For 60 seconds; AC or DC not stated
Frequency Range	50 Hz to 20 kHz	dB tolerance not stated
Isolation	Two isolated windings	Ground loop between devices is broken

When reading the electrical parameters, note the test conditions not given in the source file. Inductance is tested at 1 kHz and 0.3 V, as a minimum per winding, with no maximum and no tolerance band. DC resistance is stated at 25 °C as 1.6 Ω and 17 Ω with ±15% tolerance, with no bridge model or test current specified. The hi-pot rating is 1,500 V, 1 mA, for 60 s, but the source does not state whether the voltage is AC or DC, nor between which terminals it is applied. The frequency response is given as 50 Hz to 20 kHz with a note on low-distortion design intent; no dB tolerance or distortion figures are stated, so this band should be treated as a design range rather than a measured limit.

6.3 Materials and Construction

Item	Specification	Stated Attribute
Core	EI25 laminated core	Laminated construction, as stated
Windings	Two isolated windings	1:4 turns ratio, polarity marked
Terminals	Leads, tinned ends	Tinned, solder-ready
Insulation Class	Not stated	To be requested with the drawing
Potting	Not stated	To be requested with the drawing

6.4 Mechanical and Termination

Item	Value	Remarks
Body Length	26.0 mm	Per outline drawing
Body Width	19.0 mm	Per outline drawing
Body Height	14.8 mm	Per outline drawing
Terminals	Four leads, as shown	Lead count not stated in the source file
Lead Length and Wire Gauge	Not stated	To be confirmed on the drawing
Weight	Not stated	To be confirmed on the drawing
Mounting Method	Lead connection	Pad layout not stated

Outline as drawn: 26.0 mm across, 19.0 mm and 14.8 mm on the vertical — Outline dimensions as shown: 26.0 mm across, 19.0 mm and 14.8 mm on the vertical

Outline dimensions are stated here (which is not always the case). The body measures 26.0 × 19.0 mm with a height of 14.8 mm, per the outline drawing reproduced above; the drawing labels the body width as 26.0 mm and the vertical dimensions as 19.0 mm and 14.8 mm, so confirm the axis assignment against the ZXY drawing before designing a bracket or cutout. Four leads are visible in the product render; lead count, length, wire gauge, and weight are not stated in the source file and must be confirmed on the drawing.

6.5 Quality and Testing

Item	Requirement	Condition
Hi-Pot	1,500 V, 1 mA, 60 s	Tested on every unit
Inductance	56 mH min / 800 mH min	Verified on both windings at 1 kHz / 0.3 V
DCR	1.6 Ω / 17 Ω	±15%, at 25 °C
Polarity	Marked per schematic	Defined by the approved schematic
Electrical Data Source	EI25 product datasheet	Measured at 25 °C

7. Ordering

This part is ordered as the ZXY-EI25, described in the datasheet as the ZXYEI25 lead version. The datasheet also lists a reference part number, B2316; this is cited here as the reference number given in the source file, not an independently verified ordering code—confirm against the ZXY order. Alternative windings and custom designs are available on request, and custom products are quoted against a drawing or sample, not against this table.

Certification: no certificate naming the ZXY-EI25 accompanies this description, so this page makes no compliance claims, and the render with a row of certification badges is not used. If a certificate is required for a listing, cite the number on the certificate itself.

"Factory direct, in stock" is the supplier's own statement about this series. No stock quantities, shipping terms, or lead times are stated, so treat the phrase as a supply-channel note and confirm quantities and dates on the order.

Empty cells are intentional: product category, minimum order quantity, shipping method, stock, weight, sales price, and cost price are not provided in the source description, so they are left blank rather than estimated. Packaging and delivery are also not stated; both require inquiry to confirm, as do alternative windings and custom designs.

Brand/Manufacturer: ZXY, Shenzhen Zhi Xiang Yuan Electronics Co., Ltd. http://www.zxycoil.com

Specifications

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · Specifications
耐压测试	1,500 V, 1 mA, 60 s
耐压测试（2）	1,500 V, 1 mA, 60 s
频率范围	50 Hz 至 20 kHz
直流电阻	初级1.6 Ω，次级17 Ω，±15 % 在25 °C
匝数比	1
OEM/ODM	定制设计和按需提供替代绕组
磁芯材料	EI25叠片磁芯
型号	ZXY-EI25
品牌名称	ZXY
产地	中国广东
电感量	初级56 mH min，次级800 mH min 在1 kHz / 0.3 V

Only supplied parameters are shown. Please confirm any unlisted electrical performance, test conditions, tolerances and customization options with our engineers. The final specification sheet takes precedence.

Product Images & Drawings

View the available product images and drawings below. Click to open the original. Customized products are subject to the agreed specifications and drawings.

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings2 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 2View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings3 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 3View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings4 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 4View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings5 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 5View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings6 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 6View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings7 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 7View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings8 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 8View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings9 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 9View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings10 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 10View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings11 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 11View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings12 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 12View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings13 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 13View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings14 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 14View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings15 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 15View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings16 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 16View Original

ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core — Product Images & Drawings17 — ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core · 17View Original

Downloads

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Selection & Customization Requirements

To help confirm a suitable model and specification, please provide:

Your equipment, application, operating environment and temperature range.
As applicable: inductance, turns ratio or impedance, operating frequency, voltage, current and insulation requirements.
Size limits, mounting method, pin spacing, and any existing drawings or reference samples.
Sample quantity, estimated order volume and desired delivery date.

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Frequently Asked Questions

Common procurement questions about ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core.

What is ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core?

Can ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core be customized to our specifications?

Yes. Shenzhen ZhiXiangyuan Electronics Co., Ltd. provides OEM/ODM services. Inductance, turns ratio, current rating, core material, size and terminal style can all be customized according to your drawings or samples.

What is the MOQ and lead time for ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core?

MOQ is negotiable based on the specific model and order quantity. Typical lead time is 1-3 weeks for standard items and 2-4 weeks for customized orders. Contact our sales team for an exact quotation.

Do you provide samples of ZXY-EI25 Flying-Lead Audio Isolation Transformer, 1:4 Turns Ratio, 50 Hz-20 kHz, EI25 Laminated Core?

Yes, samples are available for evaluation before bulk orders. Please send us your requirements and shipping details to request samples.

What is the model number of this product?

The model number is ZXY-EI25. Custom model numbers can be assigned for OEM orders.

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