ZXYDU19 Permalloy Audio Isolation Transformer - 1:1+1+1 Turns Ratio | 10 Hz - 100 kHz ±0.5 dB | 1250 V Hi-Pot | DIP Through-Hole Sealed Metal Case | 47.5 x 29 x 24 mm
ZXYDU19 is a permalloy audio isolation transformer with a 1:1+1+1 turns ratio in a sealed metal DIP case: one primary, three independent secondaries, 10 Hz to 100 kHz at ±0.5 dB.
- 1:1+1+1 turns ratio: one primary plus three electrically separated secondary windings
- Frequency range 10 Hz – 100 kHz within ±0.5 dB
- Maximum 50 Hz input +6 dBu at 0.2% THD; DCR 32 Ω (1–4) and 63 + 67 + 72 Ω (5–8)
- Hi-Pot 1250 V at 1 mA for 60 s; permalloy core in a sealed metal case
- 47.5 x 29.0 x 24.0 mm, 2.5 / 30.7 / 2.5 mm pin rows for through-hole mounting
Removes the AC hum caused by ground loops and prevents the upstream output stage from being damaged. CCC, CE, RoHS and UL covered.
1. Product Name
ZXYDU19 Permalloy Audio Isolation Transformer. Turns ratio 1:1+1+1, frequency range 10 Hz to 100 kHz, DIP through-hole in a sealed metal case.
The primary winding and the three secondary windings are electrically separated, so signal energy passes between the connected circuits while direct current and ground potential differences are blocked. This galvanic isolation prevents the output stage of the preceding upstream equipment from being damaged or burnt out, and it breaks the ground loops that produce audible AC hum.
| Item | Specification |
|---|---|
| Model number | ZXYDU19 |
| Core material | Permalloy (high-permeability nickel-iron) |
| Package | DIP through-hole, sealed metal case |
| Turns ratio | 1:1+1+1 (one primary, three secondary windings) |
| Frequency range | 10 Hz – 100 kHz |
| Typical use | Hi-Fi audio, home theatre, car audio, mixer and multi-channel isolated outputs |
2. Feature
Isolating transformer — prevents the output stage of the upstream equipment from being damaged or burnt out.
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 whole audio band and well beyond it, for voice and data lines alike.
Removes AC hum from ground loops — breaks the ground path that couples mains hum into the signal.
Reduces external interference — works in balanced and unbalanced transmission alike.
3. Advantage
High common-mode isolation — the primary and the three secondaries are electrically separated, so DC and ground potential differences between the connected circuits are blocked.
Wide, flat bandwidth — 10 Hz to 100 kHz within ±0.5 dB keeps the transformer transparent across the audio band.
Clean at high level — +6 dBu at 50 Hz within 0.2% THD, so it can sit on a line-level output without audible distortion.
Compact DIP footprint — 47.5 x 29.0 x 24.0 mm on 2.5 / 30.7 / 2.5 mm pin rows for through-hole assembly.
Customised designs — ratios, terminations and dimensions developed to customer requirements.
Factory-direct supply — manufactured and shipped from stock by the factory.
| Advantage | Detail |
|---|---|
| DIP through-hole package | Pin rows of 2.5 / 30.7 / 2.5 mm for direct PCB mounting and through-hole soldering |
| Permalloy metal housing | Low interference and mechanical protection of the windings |
| Customised design | Ratios, terminations and dimensions developed to customer requirements |
| Factory-direct supply | Supplied by the manufacturer and available from stock |
4. Application
The ZXYDU19 is intended for voice and data coupling and for isolation duty in audio and control equipment:
- Hi-Fi audio
- Home theatre
- Car audio
- Mixer signal isolation output
- Multi-channel isolated signal output
- Industrial control and electronic equipment
| Application | Typical function |
|---|---|
| Hi-Fi audio | Source-to-amplifier signal coupling and ground isolation |
| Home theatre | Hum-free interconnection of multi-channel audio equipment |
| Car audio | Isolation of low-level signal lines |
| Mixer isolated signal output | Balanced, isolated console output |
| Multi-channel isolated signal output | One signal distributed to several isolated outputs |
| Industrial control / electronic equipment | Signal isolation on control and interface boards |
5. Application Specifications
5.1 Electrical specification at 25 °C
| Parameter | Specification | Condition |
|---|---|---|
| Turns ratio | 1:1+1+1 | — |
| DCR (1–4) | 32 Ω MAX | 25 °C |
| DCR (5–8) | 63 + 67 + 72 Ω MAX | 25 °C |
| Maximum 50 Hz input level | +6 dBu | 0.2% THD |
| Frequency response | 10 Hz – 100 kHz, ±0.5 dB | +1 dB at 1 kHz |
| Hi-Pot | 1250 V | 1 mA, 60 s |
5.2 Outline dimensions, unit mm
| Dimension | Value |
|---|---|
| Length (L) | 47.5 mm |
| Width (W) | 29.0 mm |
| Height (H) | 24.0 mm |
| Pin row spacing | 2.5 / 30.7 / 2.5 mm |
| Package | Compact rectangular metal case, DIP pins |
5.3 Schematic and pin configuration. The polarity dot marks the start of each winding: pin 2 on the primary, pins 7, 11 and 10 on the secondaries.
| Circuit | Terminals |
|---|---|
| Primary winding (input) | 2 – 9 |
| Secondary winding 1 | 7 – 5 |
| Secondary winding 2 | 11 – 18 |
| Secondary winding 3 | 10 – 17 |
| Can / magnetic shield | 1 – 13 |
| Core | 12 – 14 |
| Internal screen | 6 – 8 |
6. Quality and Testing Assurance
The ZXYDU19 is supplied against the specification limits above. Turns ratio, DC resistance, frequency response, harmonic distortion and dielectric strength are verified at the 25 °C reference condition; the dielectric strength test is applied at 1250 V with a leakage limit of 1 mA for 60 s.
| Certification mark | Status |
|---|---|
| CCC | Verified |
| CE | Verified |
| RoHS | Verified |
| UL | Verified |
Verified parameters — turns ratio, DC resistance, frequency response and harmonic distortion are checked at the 25 °C reference condition.
Dielectric strength — 1250 V applied with a leakage limit of 1 mA for 60 s.
Sealed construction — the permalloy core and windings sit in a sealed metal case, so verified performance is maintained in the mounted component.
Custom development — all product dimensions and performance parameters can be developed to customer requirements.