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HomeProductsInductors, Coils, ChokesFixed InductorsAIUR-12-471K
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AIUR-12-471K - Abracon LLC

Manufacturer Part Number
AIUR-12-471K
Manufacturer
Abracon
Allelco Part Number
98D-AIUR-12-471K
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
815,034 pcs available, New & Original
Parts Description
FIXED IND 470UH 310MA 1.87OHM TH
Package
Radial, Vertical Cylinder
Data sheet
AIUR-12-471K.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf

3D Drawings

AIUR-12.pdf.pdf

Environmental Information

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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In stock: 815034

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Specifications

AIUR-12-471K Tech Specifications
Abracon LLC - AIUR-12-471K technical specifications, attributes, parameters and parts with similar specifications to Abracon LLC - AIUR-12-471K

Product Attribute Attribute Value
Manufacturer Abracon
Type Drum Core, Wirewound
Tolerance ±10%
Supplier Device Package -
Size / Dimension 0.283' Dia (7.20mm)
Shielding Unshielded
Series AIUR-12
Ratings -
Q @ Freq 30 @ 100kHz
Package / Case Radial, Vertical Cylinder
Package Bulk
Product Attribute Attribute Value
Operating Temperature -40°C ~ 85°C
Mounting Type Through Hole
Material - Core Ferrite
Inductance Frequency - Test 100 kHz
Inductance 470 µH
Height - Seated (Max) 0.413' (10.50mm)
Frequency - Self Resonant 1MHz
DC Resistance (DCR) 1.87Ohm Max
Current Rating (Amps) 310 mA
Current - Saturation (Isat) -

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.50.4000

Frequently Asked Questions(FAQ)

What is the maximum current the AIUR-12-471K can handle before saturation occurs?
The AIUR-12-471K is rated for a continuous current of 310 mA. While the datasheet does not specify an explicit saturation current value (Isat), the 310 mA rating represents the design limit for sustained operation without thermal or magnetic degradation. At this current level, the DC resistance of 1.87 ohms will dissipate approximately 179 mW, which must be accommodated within the thermal environment. For applications approaching the 310 mA limit, verify that ambient temperature and PCB thermal coupling do not push the AIUR-12-471K beyond its -40°C to 85°C operating range, as resistance increases with temperature and reduces headroom toward saturation.
How does the DC resistance of 1.87 ohms in the AIUR-12-471K affect power loss in low-voltage switching circuits?
The 1.87 ohm DC resistance (DCR) of the AIUR-12-471K creates resistive losses proportional to the square of current. At the rated 310 mA, resistive losses reach approximately 179 mW. In buck converters or step-down regulators operating at lower voltages (3.3V or 5V), this loss represents 2–5% of the inductor's power handling, depending on the application. For ultra-low-loss designs, the AIUR-12-471K's DCR is moderate compared to air-core inductors but typical for ferrite drum core geometries. Designers should calculate thermal rise using P = I²R and confirm that package surface area dissipates heat adequately, or select a lower-inductance variant with proportionally lower DCR if loss is critical.
Can the AIUR-12-471K be used in unfiltered or high-dV/dt switching environments without core saturation?
The AIUR-12-471K exhibits a self-resonant frequency (SRF) of 1 MHz, which sets the upper frequency limit before parasitic capacitance and inductance interactions degrade performance. In high-dV/dt environments—such as fast switching circuits (>1 MHz) or direct exposure to transient overvoltage—the AIUR-12-471K's ferrite drum core may experience temporary saturation or flux collapse if current slew rates exceed the core's magnetic design margin. The unshielded construction also means external magnetic fields from nearby switching nodes or power traces can couple into the core. For robust operation in harsh switching environments, place the AIUR-12-471K at least 10–15 mm away from high-current paths, use a ground plane beneath the component, and verify that transient current spikes (di/dt) remain below design limits through circuit simulation or measurement.
What is the Q factor of the AIUR-12-471K at typical operating frequencies, and how does it compare to shielded alternatives?
The AIUR-12-471K exhibits a Q of 30 at 100 kHz, which is moderate for a ferrite drum core inductor. Q reflects the ratio of reactive power to resistive losses; higher Q indicates lower dissipation. At 100 kHz, a Q of 30 means the reactive energy storage is 30 times the energy dissipated per cycle. The unshielded design of the AIUR-12-471K contributes to this Q value—the lack of a shield reduces eddy-current losses in a surrounding can but allows magnetic field leakage. Shielded inductors typically achieve Q values of 40–60 at the same frequency because the shield absorbs and re-radiates magnetic energy with minimal loss. For RF filtering, EMI suppression, or precision analog circuits where Q linearity across frequency matters, consider shielded alternatives; for general-purpose switching supplies, the AIUR-12-471K's Q of 30 is sufficient.
Is the AIUR-12-471K suitable for synchronous buck converter designs, or does the 1.87 ohm DCR create excessive freewheeling losses?
In a synchronous buck converter, the AIUR-12-471K serves as the main inductor between the high-side switch and the output node. The 1.87 ohm DCR does create losses during both on and off states, but the impact depends on the duty cycle and switching frequency. At 500 kHz switching and 50% duty cycle with 310 mA load, average power loss in the AIUR-12-471K's resistance is approximately 90 mW—acceptable for many applications but not ideal for ultra-low-power designs. Freewheeling losses (current circulating through the low-side switch and inductor during the off phase) are primarily determined by the synchronous switch's on-resistance and the loop parasitics, not the inductor DCR alone. The AIUR-12-471K is practical for 12V-to-5V and higher-voltage conversions; for 3.3V or lower outputs where efficiency dominates, consider an inductor with lower inductance (and proportionally lower DCR) to maintain the same switching frequency and reduce total losses.
What thermal derating should be applied to the AIUR-12-471K when operating near 85°C in an enclosed enclosure?
The AIUR-12-471K is rated to 85°C maximum operating temperature. As temperature rises, the ferrite permeability decreases and resistive losses increase; both effects reduce inductance and Q. At 85°C ambient, the AIUR-12-471K has no additional current rating margin—the 310 mA limit already accounts for worst-case parasitics at this temperature. In an enclosed enclosure, thermal rise above ambient can easily reach 20–40°C under sustained load. To maintain reliability, derate the AIUR-12-471K's continuous current to 220–250 mA when operating in a sealed thermal environment with 85°C ambient and no active cooling. Alternatively, ensure airflow around the component or use a larger inductor with lower DCR to reduce self-heating. Monitor temperature during prototype testing with a thermocouple on the inductor body to establish a safety margin.
How does the ±10% inductance tolerance of the AIUR-12-471K affect resonant frequency tuning in LC filter circuits?
The ±10% tolerance on the AIUR-12-471K means actual inductance can range from 423 µH to 517 µH across manufacturing batches and temperature excursions. In an LC low-pass filter paired with a known capacitor, the resonant frequency F = 1/(2π√LC) will shift by approximately ±5% due to the inductor tolerance alone. For example, if the AIUR-12-471K is paired with a 100 nF capacitor, the nominal resonant frequency is 7.33 kHz, but measured designs could exhibit resonance between 6.95 kHz and 7.70 kHz. In precision tuning applications (audio, RF, or measurement circuits), this spread may exceed acceptable margins. Mitigation strategies include hand-sorting inductors by measuring DCR (which correlates loosely to inductance), using capacitor trimming (variable capacitors) rather than fixed values, or selecting a tighter-tolerance inductor series. For most switching applications, the ±10% variance is transparent.
Can the unshielded AIUR-12-471K induce crosstalk or EMI into adjacent signal traces on a compact PCB layout?
Yes. The AIUR-12-471K's unshielded construction leaves the magnetic field uncontained, allowing field lines to radiate outward. In a compact layout, if signal traces (analog or low-level digital) run parallel to or loop around the AIUR-12-471K within 5–10 mm, magnetic coupling can induce noise proportional to the rate of change of current (di/dt) through the inductor. At 310 mA peak and 500 kHz switching, a coupled trace might experience 10–50 mV of induced noise depending on loop area and coupling distance. To minimize crosstalk, route the AIUR-12-471K's input and output leads in short, direct paths with minimal loop area, separate sensitive signal traces by at least 10 mm, and shield sensitive nets with ground traces or a Faraday cage if crosstalk cannot be tolerated. For high-density designs where EMI is critical, upgrade to a shielded inductor variant.
What is the practical frequency range for the AIUR-12-471K, and does the 1 MHz self-resonant frequency limit its use in higher-speed circuits?
The AIUR-12-471K exhibits peak Q and lowest AC losses between 50 kHz and 500 kHz, where ferrite permeability is stable and core losses are minimized. The self-resonant frequency (SRF) of 1 MHz represents the frequency at which parasitic series capacitance (from the coil structure and leads) resonates with the inductance, creating an impedance peak followed by capacitive rolloff at higher frequencies. Below SRF, the component behaves as an inductor; above SRF, it transitions to capacitive behavior. Therefore, the AIUR-12-471K is suitable for switching regulators and filters up to approximately 800 kHz. For applications requiring operation above 1 MHz (such as Class D audio amplifiers, high-frequency DC-DC converters, or RF circuits), the AIUR-12-471K becomes unreliable because the SRF defines the hard boundary. Select a dedicated high-frequency inductor with higher SRF (typically 3–5 MHz or higher) if designs exceed 1 MHz.
How does the MSL-1 moisture rating affect the AIUR-12-471K's shelf life and rework compatibility?
The AIUR-12-471K carries a Moisture Sensitivity Level (MSL) of 1 (Unlimited), meaning the component is not sensitive to moisture absorption and requires no special moisture control during storage or reflow. This is a significant advantage: the AIUR-12-471K can be stored in standard ambient conditions indefinitely without desiccant bags or baking before rework. Unlike MSL-2 through MSL-6 components, there is no time limit on the floor life (the allowable duration at room temperature and humidity before reflow), and failed boards can be reworked without pre-baking the inductor. For contract manufacturers and repair facilities, this eliminates logistics overhead. The ferrite core and epoxy potting of the AIUR-12-471K are inherently moisture-resistant, making it reliable for military, automotive, and consumer applications where thermal cycling and humidity exposure occur.
What mounting considerations should be applied when designing the PCB footprint for the AIUR-12-471K's radial, vertical orientation?
The AIUR-12-471K is a radial through-hole component with vertical orientation, measuring 0.283" (7.2 mm) diameter and 0.413" (10.5 mm) seated height. The radial lead geometry requires two vias or holes spaced according to the component's internal lead pitch (typically 0.3–0.4 inches for AIUR series). Vertical orientation means the component body stands perpendicular to the board, which maximizes thermal coupling to a ground plane beneath but consumes vertical clearance. For PCB layout: (1) ensure the component's mounting diameter allows at least 0.05" clearance to adjacent components or traces to prevent solder bridges during wave or selective soldering; (2) place thermal vias directly beneath each lead hole to improve heat dissipation; (3) verify that the 10.5 mm height fits within the mechanical envelope of the final enclosure. For high-current designs, solder both leads with adequate pad area (minimum 0.1" × 0.1" per lead) to handle 310 mA without localized heating at the solder joint. If the radial footprint conflicts with PCB space constraints, consider surface-mount inductor alternatives from the AIUR series.
How does the AIUR-12-471K compare to a 470 µH surface-mount inductor (0603 or 1008 case) in terms of current capacity and thermal performance?
The AIUR-12-471K's through-hole radial geometry provides superior current capacity and thermal dissipation compared to surface-mount alternatives. A typical 470 µH SMD inductor in 1008 case can handle 200–250 mA maximum, while the AIUR-12-471K rates at 310 mA—a 24–55% increase. This stems from the AIUR-12-471K's larger physical size (7.2 mm diameter vs. 2.5 mm for 1008), which offers greater wire cross-section and more surface area for heat radiation. SMD inductors are constrained by solder-joint thermal resistance and the limited air exposure of the component body; the AIUR-12-471K's vertical orientation and larger diameter allow better convection to ambient air. Trade-offs: SMD inductors occupy less PCB real estate and are faster to reflow; the AIUR-12-471K requires through-hole assembly and takes more vertical space. For power supplies and LED drivers in space-constrained applications, SMD is preferred; for industrial controls and high-reliability systems where 310 mA is needed, the AIUR-12-471K is more robust.
Is the AIUR-12-471K suitable for EMI filtering in motor drive applications, or does the unshielded design create feedback coupling into control signals?
The AIUR-12-471K can filter switching noise in motor drive applications, but the unshielded construction requires careful layout discipline. In a three-phase inverter or single-phase BLDC driver, fast current transients (di/dt > 1 A/µs) through the AIUR-12-471K generate magnetic fields that can couple into adjacent gate-drive signals, current-sense lines, or PWM feedback paths. If these control traces loop near the inductor, noise injection can cause false triggering, reduced noise margin, or commutation errors. Mitigation: (1) physically separate the AIUR-12-471K from sensitive signal traces by at least 15 mm; (2) use shielded cables for gate-drive and current-sense lines if they must cross the inductor's magnetic field; (3) place ferrite shields or Mu-metal around the AIUR-12-471K if motor electrical noise is severe; (4) consider a shielded inductor variant if EMI test results fail. For low-speed servo drives or industrial applications without stringent EMI limits, the AIUR-12-471K is acceptable. For automotive or aerospace motor drives requiring DO-160 or CISPR compliance, the unshielded design may increase qualification risk.

Parts with Similar Specifications

The three parts on the right have similar specifications to Abracon LLC AIUR-12-471K

Product Attribute AIUR-12-470K AIUR-12-472K AIUR-12-182K AIUR-12-331K
Part Number AIUR-12-470K AIUR-12-472K AIUR-12-182K AIUR-12-331K
Manufacturer Abracon LLC Abracon LLC Abracon LLC Abracon LLC
Series - - - -
Tolerance - - - -
Height - Seated (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Type - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
DC Resistance (DCR) - - - -
Current - Saturation (Isat) - - - -
Frequency - Self Resonant - - - -
Current Rating (Amps) - - - -
Material - Core - - - -
Ratings - - - -
Q @ Freq - - - -
Shielding - - - -
Size / Dimension - - - -
Inductance - - - -
Inductance Frequency - Test - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

AIUR-12-471K Datasheet PDF

Download AIUR-12-471K pdf datasheets and Abracon LLC documentation for AIUR-12-471K - Abracon LLC.

Datasheets
Cylindrical Battery Holders.pdf
HTML Datasheet
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf
3D Drawings
AIUR-12.pdf.pdf
Environmental Information
Cylindrical Battery Holders.pdf

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AIUR-12-471K Image

AIUR-12-471K

Abracon LLC
98D-AIUR-12-471K

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