ZXYAUDIO ZXY-A187A10C Low-Frequency Audio Isolation Transformer - 1:1 Permalloy Core, ≥1500 V AC Isolation, 4+4+1 Pin PCB Mount, Electrostatic Shielding
ZXYAUDIO ZXY-A187A10C is a low-frequency audio isolation transformer with a high-permeability permalloy core and an electrostatically shielded metal case. Turns ratio 1:1 ±2%, isolation ≥1500 V AC (1 mA / 60 s / 50 Hz), 20 Hz – 20 kHz ±0.5 dB, THD < 0.1%, insertion loss < 0.5 dB; 4+4+1 pins for through-hole PCB mounting.
- Isolation voltage ≥1500 V AC, tested at 1 mA / 60 s / 50 Hz
- Breaks ground loops and eliminates hum before it reaches the signal chain
- High-permeability permalloy core: THD < 0.1%, insertion loss < 0.5 dB
- Electrostatic shielding blocks EMI / RFI interference
- 4+4+1 pin dual balanced windings plus shield, through-hole PCB mount
1. Product Overview
The ZXY-A187A10C is a low-frequency audio isolation transformer built for signal integrity and noise reduction. A high-permeability permalloy core inside an electrostatically shielded metal case delivers 1:1 coupling with at least 1500 V AC of isolation between the windings, which breaks ground loops and protects sensitive audio circuits. Dual balanced windings are brought out to a 4+4+1 pin arrangement for through-hole PCB mounting.
ZXYAUDIO A187A10C in a sealed, electrostatically shielded metal case
2. Key Features
- Low-frequency audio isolation transformer for 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 (for example 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 degradation
- High-permeability permalloy core, optimized for minimal 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, ground loops and hum eliminated
3. Advantages
The headline figure is isolation voltage: at least 1500 V AC between primary and secondary, verified at 1 mA for 60 s at 50 Hz. That separation breaks the ground path between two pieces of equipment, so ground loops and hum are eliminated at the transformer instead of being carried into the signal chain, and the circuits on the secondary side are protected from a fault on the primary side.
The high-permeability permalloy core is chosen for minimal distortion and high efficiency, which keeps total harmonic distortion below 0.1% and insertion loss below 0.5 dB across the full 20 Hz to 20 kHz range. Electrostatic shielding between the windings blocks EMI and RFI interference, so external noise does not ride on the signal.
Both sides carry two identical balanced windings, brought out on pins 1 to 4 and 5 to 8, with pin 9 reserved for the shield. The 1:1 ratio couples the signal without changing its level.
Permalloy core and electrostatic shielding, rated −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 specification lists audio equipment such as mixers and amplifiers, telecom, medical devices and industrial signal isolation.
- Audio equipment: mixers and amplifiers
- Telecom equipment
- Medical devices
- Industrial signal isolation
- Ground loop and hum elimination in audio signal paths
- Protecting sensitive audio circuits from high voltage
5. Specifications
5.1 General Specification
| Item | Specification |
|---|---|
| Model Number | ZXY-A187A10C |
| Type | Low-frequency audio isolation transformer (signal integrity and noise reduction) |
| Core Material | High-permeability permalloy (optimized for minimal distortion and high efficiency) |
| Mounting Style | PCB mount (through-hole design) |
| Pin Configuration | 4+4+1 pins (dual balanced windings + shield) |
| Frequency Range | 20 Hz – 20 kHz (full audio spectrum support) |
| Impedance Ratio | Customizable (e.g. 1:1, 600 Ω : 600 Ω, or as per requirement) |
| Isolation Voltage | ≥1500 V AC (prevents ground loops and protects sensitive circuits) |
| Insertion Loss | < 0.5 dB (minimal signal degradation) |
| Distortion (THD) | < 0.1% (high-fidelity audio transmission) |
| Operating Temperature | −40 °C to +85 °C (reliable performance in harsh conditions) |
| Shielding | Electrostatically shielded (reduces EMI/RFI interference) |
| Applications | Audio equipment (mixers, amplifiers), telecom, medical devices, industrial signal isolation |
5.2 Pin Configuration
| Function | Designation |
|---|---|
| Primary winding | Pins 1 – 4 |
| Secondary winding | Pins 5 – 8 |
| Shield / ground | Pin 9 |
| Total pins | 4 + 4 + 1 (dual balanced windings + shield) |
| Mounting | PCB through-hole, standard pins for easy soldering |
4+4+1 pin configuration with dual balanced windings and shield
Pin side of the case: two rows of four pins plus the shield pin
5.3 Ratio and Isolation Data
| Parameter | Value |
|---|---|
| Turns ratio | 1:1 ±2% |
| Isolation test condition | 1 mA / 60 s / 50 Hz |
| Frequency response | 20 Hz – 20 kHz (±0.5 dB) |
Top, bottom, side and isometric views of the shielded case
6. Quality & Testing Assurance
- Verified performance: THD < 0.1%, insertion loss < 0.5 dB, isolation ≥1500 V AC.
- Turns ratio held to ±2% of 1:1 for consistent coupling.
- High-permeability permalloy core for minimal distortion and high efficiency.
- Electrostatically shielded metal case that reduces EMI/RFI interference and protects the windings.
- Each unit is marked ZXYAUDIO A187A10C with an orientation dot for correct PCB placement.
Performance verification on the audio test bench
Model: ZXY-A187A10C | Brand: ZXYAUDIO | Ratio: 1:1 ±2%. For datasheets, samples or OEM / ODM enquiries, please contact our sales team with your required quantity and destination port.