ZXYDU19 Permalloy Audio Isolation Transformer Turns Ratio 1:1+1+1 Frequency Range 10Hz-100kHz ±0.5dB Withstand Voltage 1250V DIP Through-Hole Sealed Metal Case Size 47.5×29×24mm

1. Product Name

ZXYDU19 Permalloy audio isolation transformer. Turns ratio 1:1+1+1, frequency range 10 Hz to 100 kHz, sealed metal case DIP through-hole package.

The primary winding and three secondary windings are electrically isolated from each other, allowing signal energy to be transferred between connected circuits while blocking DC and ground potential differences. This galvanic isolation prevents the output stage of upstream preamplifier equipment from being damaged or burned out, and breaks ground loops that cause audible AC hum.

2. Product Features

Isolation Transformer — Prevents damage or burnout of the output stage of upstream equipment.

Voice and Data Coupling Transformer — One primary and three secondary windings on a single permalloy core.

Frequency Range 10 Hz to 100 kHz — Covers the entire audio band and well beyond, suitable for voice and data lines.

Eliminates Ground Loop AC Hum — Breaks ground loop paths that couple mains hum into the signal.

Reduces External Interference — Suitable for both balanced and unbalanced transmission.

3. Product Advantages

High Common-Mode Isolation — The primary and three secondary windings are electrically isolated, blocking DC and ground potential differences between connected circuits.

Wide and Flat Bandwidth — ±0.5 dB from 10 Hz to 100 kHz, ensuring the transformer remains transparent and colorless across the entire audio band.

Clean at High Levels — +6 dBu at 50 Hz with total harmonic distortion within 0.2%, can be placed at line-level outputs without noticeable distortion.

Compact DIP Package — 47.5 x 29.0 x 24.0 mm, pin row spacing 2.5 / 30.7 / 2.5 mm, suitable for through-hole assembly.

Customizable Design — Turns ratio, termination, and dimensions can be developed per customer requirements.

Factory Direct Supply — Manufactured in-house and shipped from stock.

4. Application Areas

The ZXYDU19 is suitable for voice and data coupling, as well as isolation applications in audio and control equipment:

• Hi-Fi audio
• Home theater
• Car audio
• Mixing console signal isolation outputs
• Multi-channel isolated signal outputs
• Industrial control and electronic equipment

5. Application Specifications

5.1 Electrical Specifications at 25 °C

5.2 Mechanical Dimensions, in mm

5.3 Schematic and Pin Configuration. Polarity dots indicate the start of each winding: pin 2 for the primary, and pins 7, 11, and 10 for the secondaries.

6. Quality and Testing Assurance

The ZXYDU19 is supplied to the specification limits above. Turns ratio, DC resistance, frequency response, harmonic distortion, and dielectric strength are all verified at 25 °C reference conditions; the dielectric strength test applies 1250 V with a leakage current limit of 1 mA for 60 s.

Verified Parameters — Turns ratio, DC resistance, frequency response, and harmonic distortion are all tested at 25 °C reference conditions.

Dielectric Strength — 1250 V applied with a leakage current limit of 1 mA for 60 s.

Sealed Construction — The permalloy core and windings are enclosed in a sealed metal case, ensuring the assembled component maintains verified performance.

Custom Development — All product dimensions and performance parameters can be developed per customer requirements.