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ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals

ModelZXY-ED8-10CategoryED8

ZXY-ED8-10 is the product name, and ED8X10-2.0H is the model number: ED8X10 indicates the package size, measuring 0.555 inch × 0.313 inch × 0.197 inch; 2.0H indicates a minimum inductance of 2.0 henry. This device has no printed label. The only slight marking is on the bobbin between the core and the clip, which is too small to be discerned in photos and too dark to be photographed against the varnish background; the full model designation appears only in documentation.

型号: ZXY-ED8-10, type ED8X10-2.0H
型号（2）: ZXY-ED8-10, type ED8X10-2.0H
插入损耗: 最大2.3 dB 在1 kHz

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Email:rhea@zxycoil.com

Description

1. Product Name and Identification

ZXY-ED8-10 is the product name, and ED8X10-2.0H is the model number: ED8X10 represents the package size, with external dimensions of 0.555 inch × 0.313 inch × 0.197 inch; 2.0H represents a minimum inductance of 2.0 henry. This device has no printed labels. The only slight marking is on the bobbin between the core and the clip, which is too small to be discerned in photos and too dark to be photographed against the varnish background; the full model designation appears only in documentation.

Thus, the paper documentation serves as the device's identity, yet the information in the documentation is inconsistent. The Chinese specification sheet provided with this series is a two-row table corresponding to models B2161 and B2132, with inductances of 1.0 H and 1.2 H, DC resistances available in 125 ohm, 135 ohm, and 155 ohm, and a dielectric strength test of 1 mA for 60 seconds. The English description and specification sheet only describe the single model ED8X10-2.0H, with an inductance of 2.0 H, both windings at 105 ohms, and a dielectric strength test of 1 mA for 2 seconds. Both documents are reasonable for a 1:1 line transformer series; however, only one corresponds to this product.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 11 — Two devices marking the bobbin identification location, also showing the core laminations and the windings beneath the tape

Please confirm the part number to be listed on the invoice: whether it is ZXY-ED8-10, ED8X10-2.0H, or a B-series number from the Chinese specification sheet. On a 1:1 transformer, these are electrically interchangeable in most circuits, which is why the error persists: buyers ordering from the series table may receive a 1.0 H device, and only notice the issue at low frequencies, as the difference between 1.0 H and 2.0 H is audible in audio.

2. Function Description

This is a passive 1:1 transformer with two windings sharing a laminated core, requiring no power supply and containing no active components. The signal enters one winding and exits the other, with no direct copper path between them, so ground potential differences between two devices are blocked by the core. The 1:1 ratio means no voltage transformation, which is its design purpose: this device is used to break ground loops while providing 600 ohms impedance to the line and 400 ohms to the device input, rather than gaining or attenuating the level.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 12 — Accompanying schematic: pins 1 and 2 connect to the 600-ohm line, pins 4 and 3 connect to the 400-ohm device, with polarity dots marked at the coil ends

A 1:1 device is harder to make than a step-down transformer because the two windings must be perfectly matched. The specification sheet proves this: both 1-2 and 3-4 terminals are 105 ohms with the same tolerance, and when measured in parallel, both have a minimum inductance of 2.0 H. The matching of the two halves is critical to maintaining balance stability across the entire frequency band, and balance is the basis on which balanced lines suppress interference picked up along the way.

The polarity dots on the schematic are at the end of the coil near the core, not next to the pin numbers, so the drawing does not directly indicate which pins are in phase. In a line transformer, this determines whether the balanced pair remains in-phase or inverted at the output, so it should be confirmed by signal testing on the first article sample rather than inferred directly from the drawing.

3. Winding Pairs and Two Impedances

Two windings, four terminals, and a set of naming rules worth careful interpretation. Pins 1 and 2 form one winding, and pins 3 and 4 form the other; the schematic draws 1 and 2 on the line side and 4 and 3 on the device side, so the ratio is written as 1-2 to 3-4, not 1-2 to 4-3. Each winding has a DC resistance of 105 ohms, with a tolerance of ±15% (at 25°C); the parallel inductance is a minimum of 2.0 H, measured at 250 Hz and 0.5 V.

Parameter	Value	Condition
Turns ratio, 1-2 to 3-4	1:1, ±2%	Ratio test
DC resistance, winding 1-2	105 ohms, ±15%	25°C
DC resistance, winding 3-4	105 ohms, ±15%	25°C
Inductance (parallel)	Minimum 2.0 H	250 Hz, 0.5 V, windings in parallel
Impedance	600 ohms at 1-2	1 kHz, 0 dBm, 400 ohms at 3-4
Dielectric strength	1250 V AC, 1 mA, 2 seconds	Primary to secondary
Compliance	RoHS	Materials and process

These two impedances are not a ratio relationship but an interface specification: 600 ohms is the characteristic impedance of the line, and 400 ohms is the characteristic impedance of the device input. The specification sheet expresses this as 600 ohms at 1-2, measured at 1 kHz and 0 dBm, with 400 ohms as the load at 3-4—this is the only way the value makes sense; if measured open-circuit, the reading would be higher, and designers could not learn how it behaves in an actual circuit.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 13 — Top view of two devices: laminated core stack, clips, and four terminals, two at each end

When comparing suppliers, the inductance condition is worth keeping in mind. The 2.0 H is given under parallel conditions at 250 Hz and 0.5 V; a competitor quoting 2.0 H per winding (at 1 kHz) is a different measurement method and a different device, one of which will sound thin at 50 Hz. Whenever a line transformer gives an inductance value, always ask for the test frequency, drive level, and connection method.

4. Parameters as Seen by the Signal

Three values describe the device from the signal perspective, and this page provides all three, each with its condition. Frequency response is ±0.12 dB relative to a 1 kHz reference over a range of 300 Hz to 4 kHz, flat enough that the transformer will not be a factor in channel voicing. Insertion loss is a maximum of 2.3 dB at 1 kHz, 0 dBm, with a 400-ohm load, which is the cost of copper and core, and normal for a device of this size. Return loss is a minimum of 28 dB at 300 Hz and a minimum of 35 dB at 1 kHz and 4 kHz, indicating that the input presents an actual impedance of 600 ohms across the entire band, not just at the design frequency.

Parameter	Value	Condition
Frequency response	±0.12 dB	300 Hz to 4 kHz, referenced to 1 kHz
Insertion loss	Maximum 2.3 dB	1 kHz, 0 dBm, 400-ohm load
Return loss at 300 Hz	Minimum 28 dB	Same load
Return loss at 1 kHz	Minimum 35 dB	Same load
Return loss at 4 kHz	Minimum 35 dB	Same load

The three return loss values should be viewed as a curve rather than three isolated points. The 28 dB at 300 Hz compared to 35 dB at a half-octave higher is the expected shape for a transformer with finite inductance: as the winding impedance falls with frequency, matching performance gradually degrades. If a device is rated as flat 35 dB from 300 Hz, it either has a larger inductance or is labeling mid-band values as covering the entire band.

The band itself is 300 Hz to 4 kHz, which is a voice-band rather than full audio band. This is not a limitation hidden in the fine print but an application positioning: this is a line and intercom device, and a rating up to 20 kHz would be a different design with a different core. If the program path needs 20 Hz to 20 kHz, this series is not applicable, and this page states this truthfully by explicitly marking the measurement band.

5. Construction, Gluing, and Terminals

The construction is a laminated E-I core held in a dispensed glue bobbin, with windings covered by polyimide tape, and terminals formed as gull-wing pins, two at each end. The gluing process is the most often mis-described detail: the English description calls the device potted, implying a sealed can, but the photos show an open clamped structure with adhesive at the core joint and around the bobbin-core contact. The second interpretation is what the photos support and is more important to buyers because a clamped core can be re-clamped, while a potted one cannot.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, gull-wing terminals, 14mm package 14 — Supplier's detail panel: gold-plated terminals, polyimide tape on windings, and laminated core stack

One illustration in this panel, labeled "Laminated Cayer," is a cross-section of a printed circuit board rather than a laminated structure: parallel traces and their vias are on the board. This is part of the accompanying documentation and is copied as-is, but it should be replaced before the panel goes to print, as a careful buyer will misread it as a defect in the product itself rather than a labeling issue in the illustration.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, gull-wing terminals, 14mm package 15 — Three-quarter views of the same structure, showing the clamped ends and terminal pins

Pin	Winding	Remarks
1	Winding 1-2, one end	600-ohm line side; 105 ohms to pin 2
2	Winding 1-2, other end	This pair is the line winding on the schematic
4	Winding 3-4, one end	400-ohm device side; 105 ohms to pin 3
3	Winding 3-4, other end	Drawn below pin 4 on the schematic

There are two descriptions of the terminals that conflict, affecting pad layout. The detail panel calls them SMD pins and shows them bent into gull-wing pins; the outline drawing shows flat tabs protruding from the ends, with no bending dimensions or spacing specified. No pad pattern is provided in the documentation. Before board layout, obtain the package dimensions from a sample or a published drawing; if the device is wave-soldered rather than surface-mounted, confirm the pin shape in writing.

6. Mechanical Dimensions

The external dimensions are three inch values: length 0.555 inch (tolerance ±0.020 inch), width 0.313 inch, height 0.197 inch, each with a tolerance of ±0.010 inch. Converted, these are 14.1 mm × 7.95 mm × 5.0 mm, and the conversion is given here because most drawings reaching mechanical engineers are in millimeters; the tolerances are in inches because that is the original design and cannot be converted to whole metric values.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 16 — Outline drawing as supplied, in inches: three overall dimensions and pin numbering, with a product photo overlaid on the view

Dimension	Value	Remarks
Overall length	0.555 inch, tolerance ±0.020 inch	Converted to 14.1 mm
Overall width	0.313 inch, tolerance ±0.010 inch	Converted to 7.95 mm
Overall height	0.197 inch, tolerance ±0.010 inch	Converted to 5.0 mm
Terminals	Four, gull-wing style, two at each end	Lead shape not dimensioned
Mounting	Solder terminals, surface mount or lead soldering	No pad pattern provided
Weight	Not specified	Not published

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 17 — Single product shot from a three-quarter angle on a white background, showing the outline described by the three dimensions

One of the supplied images contradicts this table and is not in the gallery: it is a render view with three labels, marking the 14 mm length as overall height and giving a width of 4.7 mm and a height of 8.5 mm. Neither of these values matches the drawing, and they appear to be swapped, as 4.7 is close to the drawing's 5.0 height and 8.5 is close to its 7.95 width. Follow the drawing; the render view is excluded here rather than corrected, and it should be replaced before use in any other context.

7. Applications

The frequency band, impedance pair, and 1:1 ratio make this product suitable for three scenarios: breaking ground loops between two audio devices, coupling a 600-ohm line to a 400-ohm device input, and for voice-band channels (300 Hz to 4 kHz is the entire signal). It is a line-level product rather than a microphone-level product because the 2.3 dB insertion loss and 2.0 H inductance are chosen for signals that are already at line level.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 18 — On a circuit board: the transformer sits among surface-mount components, with the line side brought out via twisted pair wires

This scene is a composite image rather than a photo of an actual assembly: the terminal feet float slightly above the pads, one foot overlaps a component, and the board markings are not part of the product. Treat it as an illustration of how the product might be placed on a board, not as a layout reference; obtain the pad pattern from a sample as described in the previous section.

For ground loops, the key connection is between the two windings: connect the line side to pins 1 and 2, the device side to pins 3 and 4, and do not connect either winding end to chassis ground, otherwise the loop will return through the cable shield rather than the core. The 1250 V isolation rating is precisely what allows the two sides to be at different ground potentials.

8. Ordering and Marking

Order by model number ED8X10-2.0H and add the product name ZXY-ED8-10, because the series data sheet circulating with the Chinese documentation carries B-numbers under other inductance values and a different dielectric strength test time. Clearly state the purchased ratio and frequency band, i.e., 1:1 over 300 Hz to 4 kHz, to avoid accepting a substitute from the same series that is also a 1:1 line transformer.

ZXY-ED8-10 1:1 audio isolation transformer, 600 ohm to 400 ohm line matching, ED8X10-2.0H laminated core, 14mm package gull-wing terminals 19 — Two products with the supplier's marking strip below, reproduced exactly as supplied

This marking strip has four certification marks: CCC, CE, RoHS, and UL, but no certificate numbers or file numbers are attached in the entire documentation. RoHS is also declared in the specification sheet and description text, and is the only one of the four with actual document support; the other three are merely graphic marks until numbers are in place. Before using any of these marks in submissions, obtain the certificate numbers and issuing body information.

Item	Status	Importance Here
Dimension drawing	Three labeling errors	14 mm length labeled as overall height, and 4.7 mm and 8.5 mm do not match the drawing's 7.95 mm and 5.0 mm
Width and height	Appear swapped in that figure	Its width value matches the drawing's height, and its height value matches the drawing's width
Part number	One set of documents includes two series	Chinese data lists B2161 and B2132 for 1.0 H and 1.2 H, not ED8X10-2.0H for 2.0 H
Dielectric strength test duration	2 seconds vs. 60 seconds	English documents note 2 seconds, Chinese data notes 60 seconds at the same 1250 V and 1 mA
Inductance test	250 Hz vs. 1 kHz	2.0 H is tested in parallel at 250 Hz and 0.5 V, versus 1.0 H per winding at 1 kHz and 0.3 V
Construction	Potted vs. clamped	Description says sealed potting; photos show an open clamp and glue at the core joint
Package dimensions	Not dimensioned	No pad pattern and pin shape, so pad layout depends on samples
Marking	Four marks, no numbers	CCC, CE, RoHS, and UL appear graphically; no certificate or file numbers are printed
Temperature rating	Not stated	Operating temperature range and insulation class are not mentioned anywhere

Two requirements would quickly resolve most issues in the table. A formal drawing with pin shape, spacing, and pad layout would solve the package and mounting problem; a statement clearly specifying the shipped part number would resolve the series issue, and along with it, the inductance, DC resistance, and dielectric strength test duration. Neither is a redesign, and obtaining them now costs less than after the first board is made.

Specifications

ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals · Specifications
型号	ZXY-ED8-10, type ED8X10-2.0H
型号（2）	ZXY-ED8-10, type ED8X10-2.0H
插入损耗	最大2.3 dB 在1 kHz
类型	音频隔离变压器，1
制造商	深圳市智祥源电子有限公司
频率响应	300 Hz 至 4 kHz，正负0.12 dB
耐压	1250 V AC，1 mA，2 秒
匝数比	1
封装	叠片铁芯，鸥翼端子
阻抗	600 欧姆至 400 欧姆
品牌	ZXY

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-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals — Product Images & Drawings1 — ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals · 1View Original

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Frequently Asked Questions

Common procurement questions about ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals.

What is ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals?

Can ZXY-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals 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-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals?

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-ED8-10 1:1 Audio Isolation Transformer, 600 Ohm to 400 Ohm Line Matching, ED8X10-2.0H Laminated Core, 14mm Package Gull-Wing Terminals?

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-ED8-10. Custom model numbers can be assigned for OEM orders.

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