ZXYAUDIO ZXY-A187A10C Low-Frequency Audio Isolation Transformer - 1:1 Permalloy Core, ≥1500 V AC Isolation, 4+4+1 Pin Through-Hole PCB Mounting, Electrostatic Shielding

1. Product Overview

The ZXY-A187A10C is a low-frequency audio isolation transformer designed for signal integrity and noise reduction. It features a high-permeability permalloy core housed in an electrostatically shielded metal case, achieving 1:1 coupling with at least 1500 V AC isolation between windings, which breaks ground loops and protects sensitive audio circuits. Dual balanced windings are brought out in a 4+4+1 pin arrangement for through-hole PCB mounting.

ZXYAUDIO A187A10C sealed electrostatically shielded metal case

2. Key Features

• Low-frequency audio isolation transformer ensuring signal integrity and noise reduction
• Isolation voltage ≥1500 V AC, tested at 1 mA / 60 s / 50 Hz
• Turns ratio 1:1 ±2%, impedance customizable (e.g., 1:1, 600 Ω : 600 Ω)
• Frequency response 20 Hz – 20 kHz, ±0.5 dB
• Total harmonic distortion < 0.1%
• Insertion loss < 0.5 dB for minimal signal attenuation
• High-permeability permalloy core optimized for low distortion and high efficiency
• Electrostatic shielding reduces EMI/RFI interference
• 4+4+1 pin configuration: dual balanced windings plus shield

High-voltage isolation and noise suppression: ≥1500 V AC, eliminating ground loops and hum

3. Advantages

The core highlight is the isolation voltage: at least 1500 V AC between primary and secondary, verified by testing at 1 mA for 60 seconds at 50 Hz. This isolation breaks the ground loop path between two devices, so ground loops and hum are eliminated at the transformer rather than entering the signal chain, while the secondary-side circuitry is protected from primary-side faults.

The high-permeability permalloy core is chosen for low distortion and high efficiency, keeping total harmonic distortion below 0.1% across the full 20 Hz to 20 kHz band and insertion loss below 0.5 dB. The electrostatic shield between windings blocks EMI and RFI interference, ensuring external noise is not superimposed on the signal.

Two identical balanced windings on each side are brought out to pins 1 through 4 and pins 5 through 8 respectively, with pin 9 dedicated to the shield. The 1:1 turns ratio couples the signal without changing its level.

Permalloy core and electrostatic shield, rated for −40 °C to +85 °C

Acoustic performance and ultra-low distortion: 20 Hz – 20 kHz, THD < 0.1%, insertion loss < 0.5 dB

4. Applications

The specifications apply to audio equipment such as mixing consoles and amplifiers, telecommunications, medical devices, and industrial signal isolation.

• Audio equipment: mixing consoles and amplifiers
• Telecommunications equipment
• Medical devices
• Industrial signal isolation
• Eliminating ground loops and hum in audio signal paths
• Protecting sensitive audio circuits from high voltages

5. Specifications

5.1 General Specifications

5.2 Pin Configuration

4+4+1 pin configuration with dual balanced windings and shield

Case pin side: two rows of four pins plus shield pin

5.3 Turns Ratio and Isolation Data

Top, bottom, side, and isometric views of the shielded case

6. Quality and Testing Assurance

• Performance verified by measurement: THD < 0.1%, insertion loss < 0.5 dB, isolation voltage ≥1500 V AC.
• Turns ratio tightly controlled within 1:1 ±2% for consistent coupling.
• High-permeability permalloy core for low distortion and high efficiency.
• Electrostatically shielded metal case reduces EMI/RFI interference and protects windings.
• Each unit is marked with the ZXYAUDIO A187A10C model number and a polarity dot for correct PCB placement.

Performance verification on audio test bench

Model: ZXY-A187A10C | Brand: ZXYAUDIO | Turns Ratio: 1:1 ±2%. For datasheets, samples, or OEM/ODM inquiries, please contact our sales team with the required quantity and destination port.