ZXY EE25-1:1A Audio Transformer, EE25 Series 1:1 Turns Ratio, Ferrite Core, Through-Hole PCB Mount, 25.5 x 18.5 x 22.0 mm, 5.0 mm Pin Pitch

1. Product Name

ZXY EE25-1:1A audio transformer, EE25 series, 1:1 turns ratio. High-frequency ferrite core in a metal frame, PA66 bobbin, vertical through-hole PCB mount on a 5.0 mm pin pitch, body 25.5 x 18.5 x 22.0 mm, primary pins 1-4, secondary pins 5-8.

Overview. The transformer stands upright on the board: four pins in each of two rows, 12.5 mm apart, with the body rising 22.0 mm above the copper. The board area it takes is 25.5 by 18.5 mm, which is why it can sit between adjacent components in a dense layout.

The core is a ferrite EE25 pair clamped in a metal frame. Holding the core in a frame rather than leaving it loose is what keeps the magnetic gap fixed while the part is handled, inserted and soldered, and it is also what protects the core edges during assembly.

2. Feature

1:1 turns ratio, 1:1A version. primary and secondary wound to the same turns count, which is the variant used where the two sides of the circuit are to see the same impedance.

Precision copper coil winding. wound on automatic equipment to the 1:1 ratio, so unit-to-unit build is repeatable rather than dependent on the operator.

High-frequency ferrite core in a metal frame. the core is clamped in a frame rather than left loose, so the magnetic circuit stays closed and the core is protected during handling and assembly.

Durable PA66 bobbin. polyamide 66 carries the moulded pin terminal blocks, holding the pins in position for insertion and taking the soldering heat.

Vertical through-hole mounting. straight pins on a 5.0 mm pitch, which drops into a standard PCB layout and suits hand or wave soldering.

Compact footprint. 25.5 mm × 18.5 mm with a 22.0 mm overall height, so the part stands above the board rather than spreading across it.

Laser-etched marking. the model code is etched, not printed on a sticker, so it stays legible over the service life and supports traceability in production.

Tape-wrapped insulation. tape between the winding and the core, with solder-plated terminal pins.

The four callouts are the four things to check on a delivered part: the etched code, the winding, the bobbin and the core. The code should read EE25-1:1A, the winding should be even and tight with its tape wrap unbroken, the pin blocks should be intact, and the frame should be closed over the core without a visible gap.

3. Advantage

Repeatable build. matched 1:1 windings produced on precision winding equipment give the same part from unit to unit, which matters when the transformer is one component in a signal chain that is measured.

Stable magnetic circuit. the core is clamped in its frame, so the gap does not shift in handling and the part does not need to be potted to stay consistent.

Standard 5.0 mm pitch. drop-in assembly on standard PCB layouts, hand or wave soldering, no carrier.

PA66 bobbin. mechanical strength plus heat resistance, with the pins moulded in accurate position for reliable insertion.

Legible marking. laser etching survives the service life of the part better than a printed label.

Documented compliance. ISO 9001:2015 certification and a CE Certificate of Conformity under the Low Voltage Directive, both with certificate numbers, which is what the end product's technical file needs.

One production line, many models. the same certified line covers a wide range of ZXY transformers, so several types can be sourced in one order.

The winding schematic is the reference for wiring the part: pin 1 is the primary dot, pin 5 the secondary dot. Reversing either winding will not stop the transformer working, but it will invert the signal, which matters where two channels have to stay in phase.

4. Application

Audio signal isolation and coupling. between amplifier stages and within audio equipment circuits.

Galvanic separation. between circuit stages, between boards, or between separate pieces of audio equipment.

Impedance matching. where equal primary and secondary impedances are required, and for balanced-to-unbalanced interfacing in audio signal paths.

Ground-loop interference. isolation that removes the hum produced when two pieces of equipment sit on different earth potentials.

PCB-mounted audio circuits. in consumer and professional audio equipment.

In every one of these the transformer is doing the same job: passing the signal while breaking the connection between the two grounds. A 1:1 part does that without changing the level, which is why it turns up at the interface between stages rather than inside an amplifier.

5. Application Specifications

The specification below is the construction, wiring and dimensional data declared for this model.

5.1 Product specification

5.2 Construction and mechanical data

5.3 Winding terminals

6. Quality & Testing Assurance

The transformer is manufactured by Shenzhen Zhixiangyuan Electronics Co., Ltd. and Huizhou Zhixiangyuan Technology Co., Ltd. Production is covered by a quality management system certified to ISO 9001:2015 (GB/T 19001-2016) with the scope manufacture of inductive coils and electronic transformers, and the model family that includes ZXY-EE25 has been assessed for conformity with the Low Voltage Directive 2014/35/EU, tested to EN 61558-2-1:2021 and EN 61558-2-6:2009 in conjunction with EN 61558-1:2005.

Brand / manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. and Huizhou Zhixiangyuan Technology Co., Ltd. http://www.zxycoil.com