4R7 4.7uH Shielded SMD Inductor Ferrite Chip Coil For Automotive DC-DC Converter

The 4R7 power SMD inductor is a 4.7uH surface-mount power inductor with a magnetically shielded, resin-moulded body and a flat top suitable for automatic pick-and-place assembly. The closed magnetic structure keeps flux inside the component, so the part produces very little stray field and can be placed close to signal traces, MCU pins and RF sections without disturbing them. Its low DC resistance and high saturation current make it a good energy-storage choice for buck, boost and buck-boost converters, where a stable inductance under DC bias directly affects ripple, efficiency and thermal performance. The black moulded case protects the winding against mechanical stress and humidity, and the exposed terminations give a reliable solder joint under reflow. Inductance value, package size, current rating, DCR target and marking can all be adapted to your design; we support both OEM and ODM projects, provide drawings within 3 days and samples within 7 days, and accept orders from 1 piece for prototype and evaluation work. Every unit is 100% tested for inductance and DC resistance before packing, and production runs in our own Dongguan factory under an ISO 9001 quality system.

• Magnetically shielded moulded construction keeps flux inside the body, giving a very low stray field and minimal interference with nearby circuits.
• Low DC resistance reduces copper loss and self-heating, which improves converter efficiency at high output current.
• High saturation current with a stable inductance curve under DC bias, giving the control loop more headroom during load transients.
• Compact flat-top package with a low profile, saving board area and allowing standard automatic pick-and-place assembly.
• Solid resin-moulded body protects the winding from mechanical shock, vibration and humidity in the field.
• Low audible noise: the moulded structure suppresses winding movement, so the part stays quiet in the audio band.
• Wide operating temperature range of -40 C to +125 C, suitable for enclosed equipment and high ambient environments.
• Full copper winding and controlled winding tension keep inductance and DCR consistent from batch to batch.
• Tin-plated terminations with good solderability and reliable joints under lead-free reflow profiles.
• Supplied in tape and reel with vacuum-sealed anti-static packaging, ready for high-speed SMT production.
• 100% inductance and DCR testing on every unit before packing, with test data available on request.

• DC-DC converters: buck, boost and buck-boost power modules and point-of-load regulators.
• Consumer electronics: smartphones, tablets, TV boards, set-top boxes, game consoles and wearable devices.
• Computer and server hardware: motherboards, graphics cards, SSD controllers, network cards and VRM circuits.
• LED lighting drivers, constant-current modules and backlight power supplies.
• Charging equipment: fast chargers, power banks, wireless charging pads and USB PD adapters.
• Communication equipment: routers, switches, base station power boards and IoT modules.
• Automotive electronics: infotainment, dashboard, ADAS modules and body control units where a shielded low-EMI inductor is required.
• Industrial control and instrumentation: sensor power supplies, PLC modules, drives and measuring equipment.
• Medical and security electronics: portable monitors, diagnostic devices, cameras and access control units.
• Power filtering and noise suppression on switching power supply output stages.

• Established in 2000, with 26 years focused on magnetic components for industrial control and power electronics; we are a manufacturer, not a trading company.
• Self-owned 10,000 square metre factory in Dongguan with 8 complete production lines, which keeps lead times and quality consistent on repeat orders.
• A 20-person R&D team supports you from schematic review and sample building through to mass production, and a 20-person QC team controls the process.
• Complete certification framework: ISO 9001 and ISO 14001 system certification, with CE, CB, UL, cUL and RoHS product certification available.
• Annual export value of USD 42 million, shipping to North America (50%), Northern Europe (18%), South America (15%) and Southeast Asia (15%), including OEM customers such as Midea and Federal Signal.
• Fast engineering response: drawings within 3 days and samples within 7 days, with OEM and ODM customization fully supported.
• Low entry barrier for new projects: orders accepted from 1 piece for prototyping, with DDP and DDU terms available for bulk shipments.

• Backed by a 5-year warranty as standard, extended to 20 years for special industry applications, which reflects the design margin built into the part.
• Engineered to your circuit rather than sold as a fixed part: inductance, package size, current rating and DCR target are set by your design requirement.
• Shielded structure helps your finished product pass EMC testing, reducing redesign cycles and certification cost.
• Consistent winding and moulding process keeps electrical parameters within tolerance across large production runs, reducing rework on your SMT line.
• Robust package withstands reflow, vibration and thermal cycling, supporting long-term reliability in the field.
• Free engineering support before the design is frozen: we review your target inductance, ripple current, board space and temperature rise, then recommend the most suitable package and construction.