ZXY-ED8X10-2.0H 600 Ohm : 600 Ohm SMD Audio Isolation Transformer - 1:1 Ratio | Glue-Sealed | 300 Hz to 4 kHz | RoHS Compliant
The ZXY-ED8X10-2.0H is a small glue-sealed SMD audio isolation transformer built on an ED8 x 10 laminated core. Two matched windings give 1:1 galvanic isolation between a 600 ohm line port and a 400 ohm device port, with a flat response across the 300 Hz to 4 kHz band, for board-level use in audio, voice and communication equipment.
- 1:1 turns ratio, ±2%, 600 ohm line : 400 ohm device
- Inductance 2.0 H min at 250 Hz, DCR 105 Ω / 105 Ω
- Insertion loss ≤ 2.3 dB max, frequency response ±0.12 dB (300 Hz - 4 kHz)
- Return loss ≥ 28 dB at 300 Hz, ≥ 35 dB at 1 kHz and 4 kHz
- 1250 VAC primary-to-secondary dielectric strength, glue-sealed SMD package, RoHS
1. Product Overview
The ZXY-ED8X10-2.0H is a small glue-sealed SMD audio isolation transformer built on an ED8 x 10 laminated core. Two matched windings give 1:1 galvanic isolation between a 600 ohm line port and a 400 ohm device port, with a flat response across the 300 Hz to 4 kHz band, for board-level use in audio, voice and communication equipment.
Figure 1 — 600 ohm : 600 ohm SMD audio isolation transformer, 1:1 impedance match.
General information
| Item | Specification |
|---|---|
| Model / part number | ZXY-ED8X10-2.0H |
| Transformer type | Audio isolation transformer, glue-sealed SMD |
| Winding arrangement | 1-2 (600 ohm line) : 3-4 (400 ohm device), turns ratio 1:1 ±2% |
| Core | Laminated core (ED8 x 10) |
| Termination | SMD solder terminals |
| Compliance | RoHS compliant |
| Test condition | 25 °C |
| Customization | Turns ratio, inductance and pin configuration available on request |
2. Features
- Turns ratio — 1-2 : 3-4 = 1:1, tolerance ±2%.
- DCR — 105 Ω ±15% on winding 1-2 and 105 Ω ±15% on winding 3-4.
- Inductance — 2.0 H min, measured in parallel at 250 Hz, 0.5 V.
- Impedance — 600 Ω on 1-2 with a 400 Ω load on 3-4, at 1 kHz, 0 dBm.
- Insertion loss — ≤ 2.3 dB max at 1 kHz, 0 dBm into a 400 Ω load.
- Frequency response — ±0.12 dB from 300 Hz to 4 kHz, referenced to 1 kHz.
- Return loss — ≥ 28 dB min at 300 Hz, ≥ 35 dB min at 1 kHz and at 4 kHz.
- Dielectric strength — 1250 VAC, 1 mA, 2 s, primary to secondary.
- Construction — Glue-dispensed bobbin; RoHS compliant.
Figure 2 — Glue-sealed SMD package with laminated core and solder terminals.
3. Advantages
- Matched windings — Both sides share the same DCR and inductance specification, keeping the 1:1 balance stable over the audio band.
- Flat in-band response — ±0.12 dB from 300 Hz to 4 kHz adds very little coloration.
- Low insertion loss — ≤ 2.3 dB max keeps the signal level through the transformer.
- High return loss — Good impedance matching and low reflection across the band.
- Dielectric strength — 1250 VAC primary-to-secondary supports circuit separation and ground-loop breaking.
- Glue seal — Holds the coil in position and improves resistance to moisture, vibration and handling.
- SMD terminals — Allow reflow assembly together with the rest of the board.
Figure 3 — Audio isolation and coupling: ground-loop hum and digital noise rejection.
4. Applications
- 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 communication, intercom and telephone equipment.
- Impedance matching — Matching and DC isolation between a signal source and its load.
In each case the transformer sits in the signal path, so the two sides of the circuit are isolated: the direct ground connection is removed, DC offsets cannot pass, and cable-borne interference is attenuated rather than added to the wanted signal.
Figure 4 — Board-level use: SMD audio isolation transformer mounted in the analogue stage of a digital audio board.
5. Specifications
5.1 Electrical Specification (25 °C)
| Parameter | Test condition | Specification |
|---|---|---|
| Turns ratio (1-2 : 3-4) | — | 1:1 ±2% |
| DCR (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 min |
| Impedance (1-2, 400 Ω on 3-4) | 1 kHz, 0 dBm | 600 Ω |
| Insertion loss | 1 kHz, 0 dBm, 400 Ω load | ≤ 2.3 dB max |
| Frequency response | 300 Hz - 4 kHz, ref. 1 kHz | ±0.12 dB |
| Return loss | 300 Hz / 1 kHz / 4 kHz | ≥ 28 dB / ≥ 35 dB / ≥ 35 dB min |
| Hi-Pot (primary-secondary) | 1 mA, 2 s | 1250 VAC |
Figure 5 — Electrical verification on a digital audio analyzer.
5.2 Outline Dimensions
| Dimension | Value (inch) | Equivalent (mm) |
|---|---|---|
| Overall length (incl. terminals) | .553 ± .020 | 14.05 ± 0.51 |
| Overall height | .313 ± .010 | 7.95 ± 0.25 |
| Width across the terminal rows | .197 ± .010 | 5.00 ± 0.25 |
| Assembly height, as dimensioned | .177 ± .010 | 4.50 ± 0.25 |
Dimensions are given in inches as on the data sheet; millimetre equivalents are converted at 1 in = 25.4 mm.
Figure 6 — Coil construction: multi-layer wound enameled copper wire with insulation tape.
Figure 7 — Tape and reel supply for SMT production.
6. Quality & Testing Assurance
- Electrical testing — At 25 °C: turns ratio, DCR, inductance, impedance, insertion loss, frequency response and return loss.
- Dielectric strength — 1250 VAC, 1 mA for 2 s, primary to secondary.
- Inspection — Visual and mechanical inspection of the glue seal, terminals and core stacking.
- Materials — RoHS-compliant materials and process.
- Customization — Dimensions and electrical performance can be developed to customer requirements.
Figure 8 — Certification marks published for the ZXY audio transformer range.
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