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HomeProductsInductors, Coils, ChokesFixed Inductors105R-822F
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105R-822F - API Delevan Inc.

Manufacturer Part Number
105R-822F
Manufacturer
API Delevan
Allelco Part Number
98D-105R-822F
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
29,499 pcs available, New & Original
Parts Description
FIXED IND 8.2UH 135MA 5 OHM SMD
Package
Nonstandard, 2 Lead
Data sheet
-
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 29499
  • Unit Price: $57.531
  • Subtotal: $0.00

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1+ $57.531 $57.53
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

105R-822F Tech Specifications
API Delevan Inc. - 105R-822F technical specifications, attributes, parameters and parts with similar specifications to API Delevan Inc. - 105R-822F

Product Attribute Attribute Value
Manufacturer API Delevan
Type -
Tolerance ±1%
Supplier Device Package -
Size / Dimension 0.100" L x 0.100" W (2.54mm x 2.54mm)
Shielding Unshielded
Series 105R
Ratings -
Q @ Freq 30 @ 7.9MHz
Package / Case Nonstandard, 2 Lead
Package Tape & Reel (TR)
Product Attribute Attribute Value
Operating Temperature -55°C ~ 125°C
Mounting Type Surface Mount
Material - Core Iron
Inductance Frequency - Test 7.9 MHz
Inductance 8.2 µH
Height - Seated (Max) 0.075" (1.91mm)
Frequency - Self Resonant 40MHz
DC Resistance (DCR) 5Ohm Max
Current Rating (Amps) 135 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 8504.50.8000

Frequently Asked Questions(FAQ)

What is the DC resistance of the 105R-822F inductor and how does the 5 Ohm maximum DCR affect power dissipation in my circuit?
The 105R-822F has a maximum DC resistance of 5 Ohms, which represents a relatively high resistive component for an 8.2 µH inductor. In practical circuits, this DCR creates resistive losses proportional to I²R; at the 135 mA maximum current rating, worst-case power dissipation reaches approximately 91 mW (0.135² × 5 = 0.0911 W). This thermal contribution must be factored into thermal management calculations, particularly in switching converters or RF matching networks where the 105R-822F operates near rated current continuously. Applications with intermittent or low-duty-cycle operation experience lower average dissipation, making the component viable for designs where continuous full-current operation is not required.
How does the unshielded design of the 105R-822F influence PCB layout and EMI in adjacent circuitry?
The unshielded construction of the 105R-822F inductor allows magnetic field lines to radiate into the surrounding PCB environment. This characteristic requires deliberate layout separation from sensitive analog signal paths, clock traces, or mixed-signal boundaries to minimize inductive coupling. In RF or high-speed digital applications, positioning the 105R-822F away from low-level input stages or noise-sensitive nodes is essential. The unshielded topology does offer advantages in compact PCB designs where board space is constrained, as it eliminates the dimensional overhead of shielding cans. Conversely, if EMI margins are already tight, the 105R-822F may necessitate additional filtering or guard traces, potentially offsetting space savings.
What is the self-resonant frequency of the 105R-822F and why does it matter for my application frequency?
The 105R-822F exhibits a self-resonant frequency (SRF) of 40 MHz. Below SRF, the component behaves inductively; above SRF, parasitic capacitance dominates and the 105R-822F transitions to capacitive behavior. Applications operating near or above 40 MHz require careful validation—for example, a 20 MHz switching converter using the 105R-822F operates well within the inductive zone with safe margin, while a 35 MHz RF matching network approaches the SRF knee and may exhibit reduced effective inductance or unexpected phase shifts. The quality factor specification of 30 @ 7.9 MHz provides additional context: this moderate Q indicates acceptable but not exceptional losses at the test frequency, typical for iron-core unshielded inductors of this class.
Is the 105R-822F suitable for RF or high-frequency applications, or is it limited to power supply filtering?
The 105R-822F can function in RF and high-frequency circuits, but application suitability depends on frequency proximity to its 40 MHz SRF and the required linearity. At the test frequency of 7.9 MHz with a Q of 30, the 105R-822F demonstrates reasonable performance for impedance matching networks, coupling inductors, or filtering in VHF-band circuits operating well below its resonance point. However, the iron core exhibits nonlinear behavior under DC bias—inductance shifts with current level—making the 105R-822F less ideal for precision RF tuning circuits demanding stable inductance across dynamic signal amplitudes. Power supply applications (buck converters, boost stages) and analog filtering typically tolerate this nonlinearity better than narrowband RF tuning. Designers should model frequency-dependent impedance and verify that the SRF margin accommodates harmonics or broadband interference.
How does the 105R-822F compare to ferrite-core inductors of similar inductance for EMI filtering applications?
The 105R-822F iron core exhibits lower permeability and higher saturation current capability compared to typical ferrite inductors, allowing operation at the full 135 mA rating without abrupt inductance collapse. Ferrite alternatives often saturate at 80–120 mA, forcing designers to select a larger case size or accept reduced inductance under peak load. However, ferrite inductors generally achieve lower DCR and higher Q at the same inductance, resulting in lower insertion loss and better filtering efficiency. The trade-off with the 105R-822F is thermal management: the 5 Ohm DCR generates more heat than a comparable ferrite design, but the robust current handling and absence of saturation headroom concerns simplifies design margin calculations. In applications where the 135 mA rating is actively utilized and cost is a secondary concern, the 105R-822F offers practical advantages; in low-current filtering stages where ferrite saturation is not a constraint, ferrite solutions often deliver superior efficiency.
What is the ±1% inductance tolerance of the 105R-822F and how does it affect tuned circuit performance?
The 105R-822F carries a ±1% inductance tolerance, meaning the actual value falls between 8.118 µH and 8.282 µH. For power supply filtering or broadband matching, this tolerance is negligible—the circuit performance remains stable. However, in narrowband RF tuning circuits or precision resonant stages where the 105R-822F is paralleled or series-tuned with capacitors to achieve a specific resonant frequency, the ±1% inductance window translates directly into resonance frequency uncertainty. At a tuning frequency of 10 MHz with a 10 pF capacitor, this tolerance margin produces a frequency shift of approximately ±50 kHz. Designers relying on tight frequency control must either incorporate tuning compensation (varactor diodes, variable capacitors) or select the 105R-822F in conjunction with matched capacitor tolerances to maintain system-level accuracy within specification bands.
Can the 105R-822F be used in high-temperature environments, and what performance changes should I anticipate?
The 105R-822F is rated for continuous operation from -55°C to 125°C, making it suitable for automotive, industrial, or aerospace thermal environments. However, inductor performance degrades with temperature: DC resistance increases approximately 0.3–0.5% per degree Celsius for copper windings, so at the upper 125°C operating limit, DCR rises from the 5 Ohm nominal specification toward 5.25–5.4 Ohms, increasing I²R losses proportionally. Inductance itself may shift ±2–3% over the full temperature range due to iron-core permeability changes. The MSL-1 moisture sensitivity rating indicates the 105R-822F tolerates unlimited moisture exposure during storage and assembly, removing moisture reflow concerns. Designers using the 105R-822F in high-temperature steady-state applications should model worst-case DCR and inductance variation in thermal simulations; in transient or cyclic thermal environments, the component's thermal time constant determines whether peak junction temperatures or average steady-state values govern reliability.
What packaging and handling considerations apply to the 105R-822F given its nonstandard 2-lead footprint?
The 105R-822F features a nonstandard 2-lead surface-mount package measuring 0.100" × 0.100" (2.54 mm × 2.54 mm) with a maximum seated height of 0.075" (1.91 mm). This compact footprint deviates from common industry standards (0603, 0805, 1210), necessitating custom or application-specific PCB land patterns. Automated pick-and-place equipment may require firmware updates or vision system recalibration to recognize the 105R-822F geometry, potentially increasing production setup costs for small or prototype runs. However, the MSL-1 rating eliminates moisture bake-out requirements, simplifying assembly logistics. Lead-free solder compatibility is implicit in the RoHS3 compliant designation. Designers should obtain detailed mechanical drawings and coordinate with manufacturing engineering early in the design phase to avoid last-minute assembly surprises; custom land patterns also require careful verification in initial pilot runs to ensure solder joint reliability and avoid rework.
How should I account for the quality factor (Q = 30 @ 7.9 MHz) when designing a filter using the 105R-822F?
The Q value of 30 at the 7.9 MHz test frequency characterizes the ratio of inductive reactance to dissipation (Q = XL / R). A Q of 30 reflects moderate loss—neither high-Q precision components (Q > 100) nor intentionally lossy designs. In LC filter networks, lower Q increases insertion loss and broadens the filter skirt, reducing out-of-band attenuation sharpness. For a second-order low-pass filter using the 105R-822F in series and a capacitor to ground, the filter insertion loss at the cutoff frequency approaches 1–2 dB depending on source/load impedance. In impedance matching networks or tuned amplifier loads, the Q of 30 limits the achievable selectivity and Q-multiplier effects that precision components enable. Conversely, the moderate Q provides stable, predictable damping without resonance peaking, making the 105R-822F attractive for broadband or slightly damped applications where component Q variations between production lots would otherwise cause significant circuit-to-circuit drift. Designers should validate filter response measurements during prototype evaluation to confirm that the 105R-822F's Q level meets insertion loss and selectivity budgets.
Is the 105R-822F affected by REACH or export restrictions that might impact supply chain planning?
The 105R-822F carries REACH Unaffected status, meaning it is not subject to REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals) candidate substance restrictions or approval workflows. This simplifies European market compliance and reduces documentation overhead for designs destined for EU deployment. The ECCN classification of EAR99 indicates the 105R-822F falls under general commercial commodity status without additional export licensing requirements under U.S. regulations; this status allows unrestricted distribution to most international markets without special authorization. The RoHS3 compliance designation confirms conformance with lead-free soldering standards across major markets. However, REACH or export status can shift if component formulations change or regulatory frameworks evolve; designers should verify current compliance status with distributors or the manufacturer (API Delevan Inc.) before finalizing supply chain decisions, particularly for long-term production commitments or export-sensitive applications.
What is the frequency test point (7.9 MHz) and why is the 105R-822F measured at this frequency rather than at my operating frequency?
Manufacturers specify inductor parameters—including inductance tolerance, DCR, and Q—at a standardized measurement frequency (7.9 MHz for the 105R-822F) to enable consistent part-to-part comparison and traceability. This test frequency falls in the HF/VHF band where precise measurement equipment is readily available and results are reproducible across production batches. However, inductance and Q vary with frequency due to skin effect (DC resistance increases) and core loss behavior. If the 105R-822F is used at 1 MHz for power supply filtering, the actual inductance may be slightly higher (typically 1–3% depending on core material) and DCR may be lower than datasheet values; conversely, at 15 MHz or higher, inductance may decrease and losses may increase as frequency approaches the 40 MHz SRF. Designers operating the 105R-822F significantly above or below 7.9 MHz should request or perform experimental measurement validation during prototype development to confirm that datasheet parameters translate to acceptable performance at the actual operating frequency. The 7.9 MHz specification point serves as a reference, not a guarantee of performance at all frequencies.
How does the small physical size of the 105R-822F (0.100" × 0.100" × 0.075") affect thermal management and current handling in dense PCB layouts?
The 105R-822F's compact 2.54 mm × 2.54 mm footprint and 1.91 mm height make it ideal for space-constrained applications such as mobile devices, wearables, or multi-layer PCBs with high component density. However, this miniaturization concentrates I²R losses (up to 91 mW at 135 mA) into a small thermal mass, potentially causing localized hot spots if surrounded by high-density traces or other heat-generating components. In thermal-sensitive designs, the 105R-822F should be isolated with clearance to adjacent high-frequency switching nodes or power dissipation sources; consider thermal vias or increased copper weighting on inner layers beneath the inductor to conduct heat away. The nonstandard footprint further complicates heatsinking—standard thermal relief patterns for larger inductors are inapplicable. In applications where sustained 100+ mA currents are common and ambient temperatures exceed 70°C, thermal simulation or empirical temperature testing is recommended to ensure the 105R-822F does not approach junction limits. Conversely, in pulse-mode or duty-cycled circuits, the 105R-822F's small thermal time constant allows faster temperature recovery between pulses.
What design margin should I budget for inductance shift in the 105R-822F under DC bias current variation?
Iron-core inductors like the 105R-822F exhibit permeability changes under DC bias—as current increases toward the 135 mA saturation rating, the magnetic core approaches saturation and inductance decreases. Although the datasheet does not explicitly specify inductance versus current curves, typical iron-core designs experience 5–15% inductance reduction from zero bias to maximum rated current. For a design using the 105R-822F in a boost converter with dynamic load current varying from 10 mA to 135 mA, the effective inductance at light load may exceed 8.2 µH while at full load it could drop to 7.0–7.8 µH. This variation directly affects converter duty cycle, output ripple voltage, and loop stability. Designers should request inductance-versus-current characterization from the manufacturer or perform bench measurements across the operating current range; if unavailable, assume a conservative 10% worst-case reduction from nominal and validate that control algorithms or compensators in the circuit design accommodate this shift without compromising regulation or stability margins. Simulation tools (SPICE models with nonlinear inductance) can model this behavior if detailed curves are provided.
How does the ±1% tolerance and iron core nonlinearity of the 105R-822F interact to affect overall circuit reproducibility across production lots?
The 105R-822F's ±1% inductance tolerance and iron-core DC bias nonlinearity combine to create two layers of production variability. The ±1% tolerance means one unit from a batch may measure 8.118 µH while another measures 8.282 µH—a 2% spread unit-to-unit. Additionally, the iron core's inductance-versus-current relationship may exhibit manufacturing scatter; core permeability tolerances, winding geometry variations, and core material lot-to-lot differences introduce further bias-dependent inductance shifts. In a production volume of 1000 units, some devices may saturate earlier (inductance drops faster with current) while others remain more linear. This compounded effect can degrade circuit yield and performance consistency in tightly regulated applications such as precision RF matching networks or feedback-controlled power supplies where the 105R-822F is a critical tuning element. Mitigation strategies include: (1) tighter component selection or binning from the supplier, (2) circuit designs that compensate for inductance variation (e.g., trim capacitors, feedback-based tuning), or (3) transitioning to ferrite inductors with lower permeability nonlinearity if reproducibility is paramount. Testing and characterization during design validation phases helps quantify the severity and inform go/no-go decisions.

Parts with Similar Specifications

The three parts on the right have similar specifications to API Delevan Inc. 105R-822F

Product Attribute 105R-822FS 105R-821FS 105R-822G 105R-822HS
Part Number 105R-822FS 105R-821FS 105R-822G 105R-822HS
Manufacturer API Delevan Inc. API Delevan Inc. API Delevan Inc. API Delevan Inc.
Inductance Frequency - Test - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Q @ Freq - - - -
Shielding - - - -
Tolerance - - - -
Current - Saturation (Isat) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
DC Resistance (DCR) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Size / Dimension - - - -
Series - - - -
Material - Core - - - -
Current Rating (Amps) - - - -
Inductance - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Type - - - -
Frequency - Self Resonant - - - -
Height - Seated (Max) - - - -
Ratings - - - -

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API Delevan Inc.

105R-822F

API Delevan Inc.
98D-105R-822F

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