ZXY-ED8X10-2.0H 600Ω: 600Ω SMD Audio Isolation Transformer - 1:1 Turns Ratio | Encapsulated | 300 Hz to 4 kHz | RoHS Compliant

1. Product Overview

The ZXY-ED8X10-2.0H is a compact encapsulated SMD audio isolation transformer built on an ED8 x 10 laminated core. Two matched windings provide 1:1 galvanic isolation between a 600-ohm line port and a 400-ohm equipment port, with flat response across the 300 Hz to 4 kHz band, making it suitable for board-level applications in audio, voice, and communications equipment.

Figure 1 — 600 ohm : 600 ohm SMD audio isolation transformer with 1:1 impedance matching.

Basic Information

Item	Specification
Model / Part Number	ZXY-ED8X10-2.0H
Transformer Type	Audio isolation transformer, encapsulated SMD
Winding Arrangement	1-2 (600 ohm line): 3-4 (400 ohm equipment), turns ratio 1:1 ±2%
Core	Laminated core (ED8 x 10)
Termination	SMD solder terminals
Compliance	RoHS compliant
Test Conditions	25 °C
Customization	Turns ratio, inductance, and pin configuration can be customized on request

2. Product Features

• Turns Ratio — 1-2 : 3-4 = 1:1, tolerance ±2%.
• DC Resistance — 105 Ω ±15% for winding 1-2, 105 Ω ±15% for winding 3-4.
• Inductance — 2.0 H minimum, measured in parallel at 250 Hz, 0.5 V.
• Impedance — 600 Ω at 1-2 with 400 Ω load on 3-4, at 1 kHz, 0 dBm.
• Insertion Loss — 2.3 dB maximum at 1 kHz, 0 dBm, with 400 Ω load.
• Frequency Response — ±0.12 dB from 300 Hz to 4 kHz, referenced to 1 kHz.
• Return Loss — 28 dB minimum at 300 Hz, 35 dB minimum at 1 kHz and 4 kHz.
• Dielectric Strength — Primary to secondary, 1250 VAC, 1 mA, 2 seconds.
• Construction — Encapsulated bobbin; RoHS compliant.

Figure 2 — Encapsulated SMD package with laminated core and solder terminals.

3. Product Advantages

• Matched Windings — Identical DC resistance and inductance specifications on both sides ensure the 1:1 balance remains stable across the audio band.
• Flat In-Band Response — ±0.12 dB from 300 Hz to 4 kHz introduces virtually no coloration.
• Low Insertion Loss — 2.3 dB maximum preserves signal level through the transformer.
• High Return Loss — Good impedance matching and low reflection across the entire band.
• Dielectric Strength — 1250 VAC primary-to-secondary supports circuit isolation and ground loop breaking.
• Encapsulated Construction — Secures coil position, improving moisture resistance, vibration resistance, and handling robustness.
• SMD Terminals — Compatible with reflow soldering alongside other board components.

Figure 3 — Audio isolation and coupling: ground loop hum and digital noise suppression.

4. Application Areas

• Audio Signal Isolation — Ground loop breaking in audio equipment.
• 600 Ohm Line-Level Isolation — Isolation between balanced audio stages.
• Voice and Audio Channels — 300 Hz to 4 kHz channels in communications, intercom, and telephony equipment.
• Impedance Matching — Matching and DC isolation between signal source and load.

In each application, the transformer sits in the signal path, isolating the two sides of the circuit: direct ground connections are removed, DC bias cannot pass through, and cable-induced interference is attenuated rather than added to the desired signal.

Figure 4 — Board-level application: SMD audio isolation transformer mounted in the analog stage of a digital audio board.

5. Technical Specifications

5.1 Electrical Specifications (25 °C)

Parameter	Test Condition	Specification
Turns Ratio (1-2 : 3-4)	—	1:1 ±2%
DC Resistance (1-2 / 3-4)	25 °C	105 Ω ±15% / 105 Ω ±15%
Inductance (1-2 = 3-4, parallel)	250 Hz, 0.5 V	2.0 H minimum
Impedance (1-2, 3-4 terminated with 400 Ω)	1 kHz, 0 dBm	600 Ω
Insertion Loss	1 kHz, 0 dBm, 400 Ω load	2.3 dB maximum
Frequency Response	300 Hz - 4 kHz, referenced to 1 kHz	±0.12 dB
Return Loss	300 Hz / 1 kHz / 4 kHz	28 dB min / 35 dB min / 35 dB min
Dielectric Withstanding Voltage (Primary-Secondary)	1 mA, 2 s	1250 VAC

Figure 5 — Electrical verification on a digital audio analyzer.

5.2 Mechanical Dimensions

Dimension	Value (Inches)	Equivalent (mm)
Overall Length (including terminals)	.553 ± .020	14.05 ± 0.51
Overall Height	.313 ± .010	7.95 ± 0.25
Terminal Row Width	.197 ± .010	5.00 ± 0.25
Mounted Height, as noted	.177 ± .010	4.50 ± 0.25

Dimensions are in inches on the datasheet; millimeter equivalents are converted at 1 inch = 25.4 mm.

Figure 6 — Coil construction: multi-layer wound enameled copper wire with insulating tape.

Figure 7 — Tape and reel packaging for SMT production.

6. Quality and Test Assurance

• Electrical Testing — At 25°C: turns ratio, DC resistance, inductance, impedance, insertion loss, frequency response, and return loss.
• Dielectric Strength — 1250 VAC, 1 mA, for 2 seconds, primary to secondary.
• Inspection — Visual and mechanical inspection of encapsulation, terminals, and core stacking.
• Materials — RoHS-compliant materials and processes.
• Customization — Custom sizes and electrical performance can be developed per customer requirements.

Figure 8 — Certification marks published for the ZXY audio transformer series.

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