High-Inductance 165µH Miniature SMT Inductor

Designed for precision analog and low-power signal conditioning applications, this compact surface mount Inductor delivers a high minimum inductance of 165µH in series configuration—making it ideal for filtering, tuning, and resonance control in sensitive electronic circuits. With a miniature footprint of 4.60mm × 3.40mm × 1.90mm and a maximum installed height of just 3.0mm, it enables dense PCB layouts without sacrificing performance, commonly found in medical sensors, instrumentation amplifiers, audio processing modules, IoT edge devices, and low-noise power supply pre-filters where space is limited but inductive stability is essential.

Unlike power-handling Inductors used in DC-DC converters or EMI-focused Common Mode Choke units deployed on data lines, this component prioritizes high inductance at very low current levels. It features a saturation current of only 13mA (series) and a rated operational current of 200mA, reflecting its role in signal-path applications rather than bulk energy storage. The dual-coil structure—wound with ultra-fine 2UEW-φ0.05 enameled copper wire in a precise 1P×24TS layout—ensures tight magnetic coupling and consistent inductance, even under minor thermal fluctuations across the industrial temperature range of -40℃ to +85℃.

The magnetic core is fabricated from H15C ferrite material, selected for its high initial permeability and excellent Q-factor at low frequencies. This makes the inductor particularly effective in resonant circuits, LC filters, and impedance-matching networks operating below its self-resonant frequency of 100kHz (measured at 0.1V). Its performance is further enhanced by a tightly controlled thickness tolerance of 2.8±0.20mm, which ensures reliable placement during automated SMT assembly and minimizes mechanical stress during thermal cycling—a common cause of microcracks in brittle ferrite cores.

Encapsulated in a durable SOP (Small Outline Package) housing, the component supports standard reflow soldering processes while protecting the delicate windings from environmental contaminants and mechanical shock. Although it includes a capacitance-like tolerance notation (290pF), this likely refers to parasitic inter-winding capacitance—a critical parameter in high-Q inductors that affects self-resonance and phase response. Engineers should account for this when designing narrowband filters or oscillator tanks to avoid unexpected frequency shifts.

Among passive Electronic Components, this inductor fills a niche between general-purpose chip inductors and specialized RF coils. It is not intended for high-current power delivery or common-mode noise suppression—functions better served by dedicated power Inductors or Common Mode Choke devices—but excels in applications requiring stable, high-value inductance with minimal DC resistance impact. Common design challenges such as inductance drift, microphonic noise, or Q degradation are mitigated through the use of stable H15C material and precision winding techniques.

When integrating this component into a circuit, designers should avoid routing high-current traces nearby to prevent magnetic interference, ensure adequate clearance from heat-generating elements, and consider shielding in ultra-low-noise environments. Its low rated power (10.8mA equivalent) underscores its role in signal integrity rather than power handling, aligning it with precision analog front-ends, sensor interfaces, and communication sub-systems where fidelity matters more than wattage.

In summary, while high-current Inductors dominate power electronics and Common Mode Choke units protect data integrity, this miniature 165µH inductor serves the critical yet often overlooked domain of analog signal conditioning. As modern electronics continue to shrink while demanding higher accuracy, such high-inductance, low-profile Electronic Components become increasingly vital for maintaining performance in constrained form factors. For engineers developing next-generation low-power, high-sensitivity systems, this inductor offers a reliable, production-ready solution grounded in proven magnetics technology.