Transformers are fundamental components found in countless electronic devices, serving the essential function of transferring electrical energy between circuits through electromagnetic induction. These passive components consist of two or more coils of wire wound around a common magnetic core, typically made of laminated iron or ferrite material.
The primary purpose of transformers in electronics is voltage conversion. When alternating current flows through the primary coil, it creates a changing magnetic field that induces a voltage in the secondary coil. By varying the ratio of turns between the primary and secondary windings, manufacturers can step voltage up or down to meet specific requirements.
In consumer electronics, transformers appear in power adapters for laptops, phone chargers and TVs, converting household mains voltage to the lower voltages that sensitive components require. Audio equipment relies on transformers for impedance matching and signal isolation, ensuring clean sound reproduction. Switch-mode power supplies, found in computers and modern appliances, use high-frequency transformers that are smaller and more efficient than traditional designs.
Safety represents another critical function, as transformers provide galvanic isolation between mains electricity and user-accessible circuits, protecting from electric shock. Despite the rise of solid-state alternatives, transformers remain indispensable in modern electronics due to their reliability, efficiency and versatility.
Transmission line transformer
Company: All New Semi Electronic Co. Ltd
All New Semi’s MABACT0040TR is a transmission line transformer in an SMD package with six flat leads. It has 1:1 impedance, 5MHz to 1.218GHz frequency range, 2.5-degree phase difference, 1.6dB maximum insertion loss and 16dB minimum insertion loss. This RoHS-compliant passive component is reflow-compatible up to 260 C.
Lead time: 1 to 7 days
Current transformer
Company: Hubei Tianrui Electronic Co. Ltd
The TR215-LXN-071201 from Hubei Tianrui is a current transformer with a hole through the center of the magnetic core. Used as a leakage sensor, it has a primary rated input current of 10, 50 or 200mA, respectively with 0 to 15, 75 or 300mA measurement range, and a secondary rated output current of 5V. The response time is ≤120ms. This unit is CE-marked.
Lead time: 15 to 35 days
LAN transformer
Company: Jiaxun (Huizhou) Intelligent Technology Co. Ltd
Jiaxun’s LAN transformer, with model number 749010012, has a 12-pin SMD package measuring 19.56mm or 0.77-inch in length. Designed for single-port 10/100/1000BASE-T Ethernet applications, it has 12 cores and an operating temperature of -40 to 85 C.
Lead time: 7 to 15 days
Toroidal transformer
Company: Shaanxi Fullstar Electronics Co. Ltd
The FTT-3001-4-0795 from Shaanxi Fullstar is a toroidal transformer with 50/60Hz frequency. It is a single-phase dry-type unit with a single output. Applications include audio power amplifiers, medical equipment, voltage converters and UPS. This passive component is CE-marked and RoHS-compliant.
MOQ: 10 units
Lead time: 10 to 30 days
Ferrite-core transformer
Company: Yangzhou Positioning Tech Co. Ltd
Yangzhou Positioning’s EE16 transfomer has 2.28mH inductance, ≤80µH leakage inductance, 3kVAC/min withstand voltage at 5mA and 4.5ohm maximum DC resistance.
MOQ: 1,000 units
Lead time: 15 to 30 days
LAN discrete transformer
Company: Zhuhai Eastever Electronic Co. Ltd
The ES24701T G. from Zhuhai Eastever is a 24-pin LAN discrete transformer for 100/1000BASE-T Ethernet applications. It has 30W PoE support. This SMD component is available in single- and three-phase variants. It complies with RoHS requirements.
Lead time: 7 to 30 days
