Coilcraft releases KTA5050 series family of molded, shielded power inductors with ultra‑low inductance values optimized for modern low‑voltage, high‑current DC‑DC converters in compact 5.6 × 5.2 × 5.0 mm packages.
These parts extend the KTA molded power inductor family toward higher power levels while maintaining low losses and robust AEC‑Q200 performance for demanding CPU, GPU, ASIC, and automotive power rails.
Key features and benefits
The KTA5050 inductors are designed as low‑inductance power chokes for fast transient, high‑current multiphase regulators where board area and efficiency are both critical.
- Inductance range from approximately 65 nH up to around 600 nH, covering typical values used in single‑phase and multiphase VRMs and point‑of‑load (PoL) converters according to manufacturer datasheet.
- Compact molded shielded package of about 5.6 mm length, 5.2 mm width, and 5.0 mm height, supporting high current density in space‑constrained server and automotive boards.
- Composite magnetic core optimized for low AC losses at high switching frequencies used in modern buck converters.
- Very low DC resistance (DCR) values to minimize conduction loss and improve overall converter efficiency, especially at high load currents.
- Soft saturation behavior to support large transient load steps without abrupt inductance collapse, which helps keep output voltage within tight tolerance during spikes.
- AEC‑Q200 qualification and maximum part temperature rating up to 165 °C, enabling robust operation in engine compartments and other harsh environments.
- RoHS‑compliant, halogen‑free construction and compatibility with standard lead‑free reflow profiles according to Coilcraft specifications.
In practical terms, the combination of low inductance and low inductor losses makes KTA5050 well suited to high switching frequencies, where small inductance values allow tight transient control without sacrificing efficiency. The molded shielded construction also reduces radiated EMI and simplifies layout around sensitive digital ICs.
Typical applications
KTA5050 targets high‑performance power stages where transient performance, efficiency, and thermal margins are critical.
- Multiphase voltage regulator modules (VRMs) for server and data‑center CPUs and GPUs.
- PoL regulators for high‑current ASICs and SoCs in networking, AI acceleration, and storage systems.
- High‑current core and memory rails on graphics cards, accelerator cards, and high‑end embedded compute modules.
- Automotive ECUs and domain controllers, including ADAS, infotainment, and powertrain control units where AEC‑Q200 and elevated temperature capability are required.
- Industrial and telecom power supplies where low profile and tight efficiency targets drive selection of low‑inductance, low‑loss chokes.
For many of these use cases, designers operate at low output voltages and high currents, with switching frequencies in the several hundred kilohertz to multi‑megahertz range, which aligns well with the KTA5050 performance envelope specified in the datasheet.
Technical highlights
This section summarizes key technical characteristics of the KTA5050 series; exact values should be taken from the official datasheet for each ordering code.
- Inductance values
- Nominal inductance options roughly from 0.065 µH to 0.6 µH.
- Tolerance is typically ±20% for these low‑inductance, high‑current parts according to manufacturer specifications.
- Self‑resonant frequency (SRF) values are in the tens of MHz range, depending on part value; higher SRF generally corresponds to lower inductance types.
- Current ratings
- High saturation current ratings on the order of several tens of amps, with the lowest inductance types specified up to around 50 A according to manufacturer datasheet.
- Current ratings normally specified for defined inductance drop criteria (for example, 20% or 30% reduction) and for temperature rise (such as 20 °C or 40 °C rise above ambient); both limits must be considered during design.
- Soft saturation characteristics help maintain inductance over a wide current range, easing worst‑case transient and short‑circuit analysis.
- Loss and resistance parameters
- Very low DCR values in the sub‑milliohm to a few milliohms range depending on inductance option, which directly reduces I²R loss and improves thermal behavior.
- Inductors are optimized for low AC loss at high switching frequencies, which is crucial when using MHz‑range controllers or spread‑spectrum modulation schemes.
- Mechanical and environmental data
- Package size: approximately 5.6 × 5.2 × 5.0 mm molded body footprint for all KTA5050 variants.
- Terminations: tin‑based, RoHS‑compliant finishes over copper terminations compatible with standard reflow assembly; other termination variants may be available per manufacturer options.
- Operating and storage temperature ranges, including derating versus current, are specified in the datasheet and should be checked for the chosen part number, especially for designs approaching 165 °C maximum part temperature.
When comparing with other molded shielded inductors, KTA5050 effectively trades a modest increase in footprint for significantly higher current capability and lower DCR, making it attractive wherever several tens of amps per phase are required.
Design‑in notes for engineers
When designing in KTA5050 inductors, several practical points help ensure robust performance and efficient use of the series.
- Inductance selection
- For multiphase VRMs and PoL converters, select inductance based on target ripple current, switching frequency, and transient response; lower inductance improves transient response but increases ripple and core loss.
- Use the manufacturer’s online inductance and current rating data to verify that the selected value meets ripple and transient specs over the full operating current range and temperature.
- Current and thermal margins
- Compare application peak current and RMS current against both saturation‑based and temperature‑rise‑based current ratings; the lower of the two is the effective current limit.
- Pay attention to derating curves versus ambient temperature, particularly in sealed enclosures or under‑hood automotive environments where the inductor body can approach its 165 °C maximum part temperature.
- Layout and EMI
- The molded shielded construction reduces stray magnetic fields, but layout still matters: keep current loops tight, minimize loop area between high‑di/dt paths, and avoid routing sensitive signal traces under the inductor.
- If parallel phases use multiple KTA5050 inductors, keep them aligned and placed symmetrically around the controller to balance parasitics and thermal distribution.
- Reliability and qualification
- For automotive and other harsh‑environment designs, confirm AEC‑Q200 qualification for the exact ordering code selected and check any additional OEM‑specific stress test requirements.
- Ensure that solder‑joint reliability is adequate by following Coilcraft’s recommended land pattern and reflow profile, especially for heavy, high‑current inductors subject to vibration.
Source
This article is based on official technical information and product documentation provided by Coilcraft for the KTA5050 molded shielded power inductor family, interpreted and summarized for design and procurement engineers.