PCB Transformers

PCB transformers are essential components used in modern electronics and industrial systems for voltage transformation, isolation, and current sensing directly on printed circuit boards (PCBs). PCB mount current transformers measure electrical current, thereby enabling safe and efficient electrical energy transfer within a wide variety of applications.

Types of PCB Transformers

PCB transformers are generally classified by their mounting method: through-hole and surface mount.

Through-hole PCB transformers are designed with extended pins or connectors that pass through holes in the PCB and are soldered on the opposite side. These are typically used in high-reliability or multilayered board applications due to their robust mechanical anchoring and better power-handling capabilities.
Surface mount PCB transformers, on the other hand, sit directly on the surface of the PCB without penetrating it. This makes them ideal for compact, high-density circuit designs such as mobile devices, compact power supplies, and consumer electronics. Their small footprint allows for efficient space management on modern PCBs.

Whether you require a PCB mount transformer for a rugged industrial design or a compact PCB electrical transformer for consumer tech, be sure to choose the right one for your needs.

How PCB Transformers Work

A PCB transformer operates on the same electromagnetic induction principle as conventional transformers. It consists of two or more wire windings (primary and secondary) wound around a magnetic core. When alternating current (AC) flows through the primary winding, it creates a magnetic field in the core. This changing magnetic field induces a voltage in the secondary winding, enabling the transformation of voltage and current levels. Current transformer PCB mounts or PCB mount current transformers, measure electrical current flowing through a conductor by converting it into a measurable signal, often for industrial applications.

There are several variations of a circuit board transformer, including:

Step-up or step-down voltage transformers
Isolation transformers, which galvanically isolate the input and output
Current sensing transformers (e.g., PCB current transformer) for monitoring load conditions

In each case, energy is transferred with high efficiency, minimal heat loss, and electrical isolation, within the compact structure of a PCB transformer.

What Are PCB Transformers Used For?

PCB transformers are used in a broad range of commercial, industrial, and consumer applications where compact and reliable voltage or current conversion is necessary.

Their core functions include:

Voltage step-down for low-power circuits
Galvanic isolation to protect sensitive components
Current sensing in control systems and metering devices

Key Benefits and Features of PCB Transformers

Key benefits of PCB transformers include:

Compact size: Fit seamlessly on densely populated PCBs
High reliability: Suitable for industrial and mission-critical systems
Safety isolation: Especially in isolation transformer PCB designs
Thermal protection: Many units include temperature-resistant encapsulated PCB transformer housings
Low electromagnetic interference (EMI): For cleaner signal transmission

Industrial Applications of PCB Transformers

In industrial environments, PCB electrical transformers play a critical role in maintaining electrical integrity and process safety. These applications demand components that are not only compact but also highly dependable under mechanical vibration, temperature fluctuations, and electromagnetic disturbances.

Key applications include:

Manufacturing & Automation In programmable logic controllers (PLCs), motor drives, and robotics, PCB transformers regulate control voltages and isolate communication lines to prevent electrical faults from propagating across systems.
Telecommunications Used in network routers, repeaters, and switching equipment, isolation transformer PCB models protect low-voltage circuits from line surges and provide clean power to signal processing units.
Consumer Electronics Devices like smart TVs, home automation systems, and gaming consoles integrate PCB mount transformers to manage power conversion and surge protection in a compact form factor.
Energy & Utilities PCB current transformer units are embedded in smart meters and energy management systems to monitor electrical consumption with precision, aiding in grid efficiency and billing accuracy.
Medical Equipment Isolation is critical in patient-connected devices such as ECG monitors and infusion pumps. PCB electrical transformers ensure that sensitive signal pathways are protected from high-voltage sources.
Automotive & EV Systems In electronic control units (ECUs), PCB board transformers are used to isolate communication buses (CAN, LIN), regulate voltage to microcontrollers, and support power electronics in hybrid and electric vehicles.

PCB Transformer Installation

Professional installation ensures long-term reliability and regulatory compliance, especially for applications involving safety-critical systems.

While the exact procedure depends on the mounting type, some general installation guidelines include:

Ensure compatibility with the PCB layout: Match pad spacing for surface-mount or hole diameter for through-hole types.
Observe correct orientation: Some transformers are polarised.
Use appropriate soldering methods: Wave soldering for through-hole, reflow soldering for surface mount.
Maintain clearance and creepage distances: As per IEC standards, maintain these particularly for high-voltage or medical applications.
Inspect connections: Inspect post-installation for any cold joints or improper contacts.

How To Choose The Right PCB Transformers

When selecting a PCB transformer, consider the following technical and environmental factors:

Electrical Specifications: Voltage input/output, frequency, power rating
Mounting Type: Choose between surface mount and through-hole
Functionality: Voltage conversion, isolation, or current sensing
Size Constraints: For compact or space-limited designs
Certifications: UL, IEC, or RoHS compliance
Thermal Ratings: Especially important for high-temperature environments or continuous-duty operation
Encapsulation: Use encapsulated PCB transformer types for added protection against moisture and dust

A Trusted Supplier of PCB Transformers in Australia

RS Australia is a leading distributor of PCB transformers, offering a wide range of reliable and high-performance components suitable for industrial, commercial, and electronic applications. Our extensive catalogue includes surge protection components, PCB headers, and rack cable management from globally recognised manufacturers such as RS PRO, Block, and Myrra.

Browse and order PCB electrical transformers online with confidence, backed by detailed technical specifications, fast delivery across Australia, and responsive customer support. For more information on shipping options and lead times, please visit our delivery page.