ZXY EI28-600:600 Audio Isolation Transformer - Permalloy Core 600 Ohm to 600 Ohm 1:1 Turns Ratio Audio Isolation Transformer for PCB Mounting
ZXY EI28-600:600 is a 1:1 audio isolation transformer on a high-permeability permalloy laminated core. It matches 600 Ω to 600 Ω across 20 Hz – 20 kHz and galvanically isolates the two windings, so ground loops, DC offset and common-mode noise stop at the transformer.
- 1:1 turns ratio, 600 Ω primary to 600 Ω secondary
- Frequency response 20 Hz – 20 kHz, low distortion permalloy core
- Galvanic isolation eliminates ground loops, hum and common-mode noise
- EI28 body 23.0 × 18.0 × 21.0 mm max, 2 + 2 dual-row pins for PCB mounting
- CCC, CE, RoHS and UL certified quality
1. Product Overview
The ZXY EI28-600:600 is a 1:1 audio isolation transformer built on a high-permeability permalloy laminated core. It couples a balanced signal from primary to secondary at matched 600 Ω impedance and transfers audio from 20 Hz to 20 kHz without changing signal level, while galvanically separating the two windings so that ground loops, DC offset and common-mode noise never reach the downstream stage.
ZXY EI28-600:600 audio isolation transformer, 3/4 view
2. Key Features
- 1:1 turns ratio with matched 600 Ω primary and secondary impedance
- 20 Hz – 20 kHz frequency response for full-bandwidth audio
- High-permeability permalloy laminated core: low distortion, high efficiency
- Galvanic isolation between the primary and secondary windings
- 2 + 2 pin layout: PRI on pins 1–2, SEC on pins 3–4
- Dual-row solder pins for direct PCB mounting
- Compact EI28 body, 23.0 mm × 18.0 mm × 21.0 mm maximum
- Horizontal mounting with wings or vertical mounting bracket
Key construction: permalloy core lamination, 1:1 galvanic isolation, 20 Hz - 20 kHz response, PCB direct solder mounting
Printed ZXY EI28-600:600 label on the transformer cover
3. Advantages
Permalloy, a high-permeability nickel-iron alloy, is what keeps this transformer linear across the audio band. The laminated core concentrates flux efficiently, so insertion loss and harmonic distortion stay low at both ends of the spectrum and programme material keeps its natural timbre.
Because primary and secondary are galvanically isolated, the transformer breaks the ground path between two pieces of equipment. Hum, buzz and common-mode interference are stopped at the transformer instead of travelling into the signal chain, and the source and load are shielded from DC offset and ground potential differences.
Precision automated winding keeps impedance and turns ratio consistent from unit to unit, so a whole batch behaves the same way on the bench and in the field. The dual-row pin arrangement and optional brackets simplify assembly into existing layouts.
Batch consistency and reliability from precision automated winding and testing
4. Applications
The transformer is specified for communication equipment, and its isolation function suits any audio interface where two circuits have to be coupled without a shared ground.
- Communication equipment and line interfaces
- Breaking ground loops and hum at amplifier, mixer and interface inputs
- Balanced line-level signal transmission between audio equipment
- Broadcast, studio and installed sound systems
- Microphone and instrument pre-amplifier input isolation
- Industrial and test-instrumentation signal isolation
Direct PCB mounting on an audio circuit board
Versatile mounting options: horizontal mount with wings or vertical mounting bracket
5. Specifications
5.1 General and Electrical Specification
| Item | Value |
|---|---|
| Brand Name | ZXY |
| Model Number | EI28-600:600 |
| Description | Permalloy audio transformer |
| Transformer Type | Audio Isolation |
| Core Material | Permalloy |
| Turns Ratio | 1:1 |
| Input Impedance | 600 Ω |
| Output Impedance | 600 Ω |
| Frequency Response | 20 Hz – 20 kHz |
| Application | Communication equipment |
| Place of Origin | Guangdong, China |
| Manufacturing Date Code | 202609 |
5.2 Pin Assignment and Impedance
| Pin | Winding | Impedance |
|---|---|---|
| 1 – 2 | Primary (PRI) | 600 Ω |
| 3 – 4 | Secondary (SEC) | 600 Ω |
| PRI to SEC | Galvanic isolation, 1:1 impedance ratio | — |
5.3 Dimensions
| Parameter | Specification |
|---|---|
| Body width (front view) | 23.0 mm max |
| Body height (front view) | 18.0 mm max |
| Body depth (side view) | 21.0 mm max |
| Pin pitch, adjacent pins | 5.0 mm |
| Row spacing, PRI to SEC | 15.0 mm |
| Pin layout | 2 + 2 dual-row solder pins |
| Mounting | Horizontal (with wings) or vertical bracket |
Note: all dimensions are in millimetres (mm). Tolerance: ± 0.5 mm.
1:1 isolation schematic, 2 + 2 pinout (bottom view) and galvanic noise isolation
Product dimensions: 23.0 mm max width, 18.0 mm max height, 21.0 mm max depth
4-view technical specification: top, front, bottom and 3D isometric views
6. Quality & Testing Assurance
- Windings are produced on precision automated equipment, and the output is tested so that batch-to-batch characteristics remain consistent.
- Electrical performance is verified against the ratings listed in Section 5 before packing.
- Each unit carries a printed ZXY EI28-600:600 label for traceability, together with its manufacturing date code.
- Certified quality: CCC, CE, RoHS and UL.
Audio performance verification on the test bench
International certifications and compliance: CCC, CE, RoHS, UL
Model: EI28-600:600 | Brand: ZXY | Origin: Guangdong, China. For datasheets, samples or OEM / ODM enquiries, please contact our sales team with your required quantity and destination port.