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HomeProductsInductors, Coils, ChokesFixed InductorsIMC1812BN1R8K
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IMC1812BN1R8K - Vishay Dale

Manufacturer Part Number
IMC1812BN1R8K
Manufacturer
Dale / Vishay
Allelco Part Number
98D-IMC1812BN1R8K
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
39,838 pcs available, New & Original
Parts Description
FIXED IND 1.8UH 390MA 650MOHM SM
Package
1812
Data sheet
IMC1812BN1R8K.pdf

HTML Datasheet

IMC1812.pdf
RoHs Status
 
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In stock: 39838
  • Unit Price: $0.662
  • Subtotal: $0.00

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1+ $0.662 $0.66
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

IMC1812BN1R8K Tech Specifications
Vishay Dale - IMC1812BN1R8K technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - IMC1812BN1R8K

Product Attribute Attribute Value
Manufacturer Dale / Vishay
Type Drum Core, Wirewound
Tolerance ±10%
Supplier Device Package 1812
Size / Dimension 0.177' L x 0.126' W (4.50mm x 3.20mm)
Shielding Unshielded
Series IMC-1812
Ratings -
Q @ Freq 50 @ 7.96MHz
Package / Case 1812 (4532 Metric)
Package Bulk
Product Attribute Attribute Value
Operating Temperature -55°C ~ 125°C
Mounting Type Surface Mount
Material - Core Iron Powder
Inductance Frequency - Test 7.96 MHz
Inductance 1.8 µH
Height - Seated (Max) 0.134' (3.40mm)
Frequency - Self Resonant 60MHz
DC Resistance (DCR) 650mOhm Max
Current Rating (Amps) 390 mA
Current - Saturation (Isat) -

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.50.8000

Frequently Asked Questions(FAQ)

What are the practical design considerations for the IMC1812BN1R8K when selecting an inductor for power supply filtering applications?
The IMC1812BN1R8K is a 1.8 µH unshielded drum core inductor with a 650mOhm maximum DC resistance and 390 mA current rating, making it suitable for low-power signal filtering and EMI suppression rather than primary power conversion. The 650mOhm DCR creates approximately 100 mW of I²R losses at full rated current, which must be factored into thermal budgets. The unshielded iron powder core produces significant magnetic field radiation, so PCB placement away from sensitive analog circuits is necessary. For applications requiring lower DCR or higher current handling, alternative core materials or larger package sizes should be evaluated.
How does the IMC1812BN1R8K compare to shielded inductors for high-frequency noise suppression near digital circuits?
The IMC1812BN1R8K is unshielded, meaning its magnetic field extends into surrounding space, which can couple unwanted energy into nearby signal traces and sensitive analog components. In contrast, shielded inductors contain the magnetic field within a Faraday cage, reducing cross-talk. For the IMC1812BN1R8K, placement requires at least 5–10 mm clearance from vulnerable circuits, or alternative shielded inductors should be used. The trade-off is cost and size; the IMC1812BN1R8K's unshielded design reduces manufacturing complexity, but shielded alternatives provide better EMI containment at higher cost.
What is the saturation behavior and current headroom of the IMC1812BN1R8K in transient load conditions?
The IMC1812BN1R8K datasheet does not specify saturation current (Isat), which indicates the inductor is designed to operate safely well below core saturation within its 390 mA rating. Iron powder cores exhibit gradual saturation rather than abrupt collapse, so the IMC1812BN1R8K will see progressive inductance degradation above rated current, but will not fail catastrophically. For transient current spikes exceeding 390 mA, the inductor core will partially saturate, reducing effective inductance and increasing damping losses. Design margins of 20–30% below the 390 mA rating are recommended for circuits with dynamic load variations.
Why does the IMC1812BN1R8K exhibit 650mOhm DC resistance, and how does this affect circuit efficiency?
The 650mOhm maximum DCR results from the resistivity of the copper wire windings in the IMC1812BN1R8K's drum core construction. At DC or low frequencies, this resistance dominates inductor losses. In a 390 mA application, the IMC1812BN1R8K dissipates approximately 99 mW (0.390² × 0.650). In battery-powered or energy-constrained systems, this parasitic resistance can reduce overall circuit efficiency by 2–5%, depending on duty cycle. For applications where DCR losses are unacceptable, larger package sizes or litz wire construction can reduce resistance, but at increased cost and footprint.
How should the IMC1812BN1R8K be placed on a PCB to minimize self-resonance effects and maintain specified inductance?
The IMC1812BN1R8K specifies a self-resonant frequency of 60 MHz, meaning above this frequency the inductor begins to behave capacitively rather than inductively. Parasitic capacitance between windings becomes dominant, and the impedance characteristic inverts. For the IMC1812BN1R8K, PCB layout should keep trace lengths to the inductor pads under 10 mm and avoid routing high-frequency signals adjacent to the inductor leads. Component orientation should also position the inductor's length (4.50 mm) perpendicular to high-speed clock lines. Beyond 60 MHz operation, the IMC1812BN1R8K will exhibit impedance peaking and potential instability; alternative inductors with higher SRF should be selected for GHz-range applications.
What is the difference between the Q factor specification at 7.96 MHz and the actual quality factor the IMC1812BN1R8K exhibits across its operating bandwidth?
The IMC1812BN1R8K specifies Q = 50 @ 7.96 MHz, which is a snapshot measurement at a single frequency. The Q factor represents the ratio of reactive energy stored to energy dissipated per cycle; higher Q indicates lower losses. At 7.96 MHz, the IMC1812BN1R8K's 650mOhm DCR contributes to this moderate Q value. Below 7.96 MHz, Q will typically increase because inductive reactance decreases slower than resistance remains constant. Above 7.96 MHz approaching 60 MHz SRF, Q initially increases further but then degrades sharply as distributed capacitance effects dominate. For broadband filtering applications, the IMC1812BN1R8K's Q characteristic should be modeled across the target frequency range using equivalent circuit simulation.
How does the ±10% inductance tolerance of the IMC1812BN1R8K affect filter tuning and frequency response?
The IMC1812BN1R8K carries a ±10% inductance tolerance, meaning delivered parts may exhibit values between 1.62 µH and 1.98 µH. In resonant filter circuits where the IMC1812BN1R8K is paired with a capacitor, this tolerance translates directly to resonant frequency variation: a ±10% inductance change produces approximately ±5% center frequency shift. For precision filter designs, either tighter tolerance variants must be sourced, or post-assembly tuning (e.g., adjustable capacitor) must compensate for component variation. Statistical tolerance stack-up analysis is essential; Monte Carlo simulation should account for the IMC1812BN1R8K tolerance when designing multi-stage filter chains to avoid unexpected response deviations.
What thermal performance can be expected from the IMC1812BN1R8K under continuous operation at 390 mA in a confined PCB space?
The IMC1812BN1R8K's 650mOhm DCR and 390 mA rating produce ~99 mW steady-state dissipation. The 1812 (4532 metric) package has limited thermal surface area (~15 mm² exposed copper), so heat dissipation relies primarily on PCB copper pours and trace connectivity. In a confined space without dedicated thermal vias or ground planes, the IMC1812BN1R8K can reach 80–120°C junction temperature above ambient at full current. The operating temperature range is −55°C to +125°C, allowing ~25–45°C headroom. For extended reliability, design for ≤50% of rated current in thermally constrained layouts, or use larger inductor packages with improved thermal coupling to the PCB.
Is the IMC1812BN1R8K suitable for replacing the suggested substitute ELJ-FB1R8KF, or are there performance differences to consider?
The IMC1812BN1R8K and ELJ-FB1R8KF are listed as substitutes, both providing 1.8 µH inductance. However, differences exist in core material and shielding: the IMC1812BN1R8K uses an unshielded iron powder drum core with 650mOhm DCR, while the ELJ-FB1R8KF may have different core geometry and shielding characteristics. Verification requires cross-referencing the ELJ-FB1R8KF datasheet to confirm DCR, Q factor, and SRF alignment. If substituting the IMC1812BN1R8K with an alternative, measure actual inductance and resistance on prototype builds, as even minor core differences can shift filter response by 5–15%. Thermal performance and PCB layout requirements may also differ between the two packages.
How does moisture sensitivity level MSL 1 affect handling and storage of the IMC1812BN1R8K?
The IMC1812BN1R8K carries MSL 1 (Moisture Sensitivity Level 1), the lowest moisture sensitivity classification, meaning unlimited shelf life without desiccant storage or baking requirements. Unlike higher MSL components, the IMC1812BN1R8K is not susceptible to popcorn cracking or delamination during reflow soldering even after extended ambient exposure. For manufacturing, standard PCB assembly processes without specialized moisture control are acceptable. However, the IMC1812BN1R8K's unshielded iron powder core can absorb moisture over years of storage in high-humidity environments, potentially increasing DCR slightly; storing in typical dry-pack conditions (below 30% relative humidity) is still recommended for long-term shelf life optimization.
What are the electrical implications of the IMC1812BN1R8K being RoHS non-compliant?
The IMC1812BN1R8K is RoHS non-compliant, meaning it may contain lead, cadmium, or other restricted substances beyond established thresholds. For consumer or European Union applications subject to RoHS 2 directive enforcement, the IMC1812BN1R8K cannot be used without documented exemption or supply-chain verification. Electrically, RoHS non-compliance does not directly affect performance; however, availability may be limited as OEMs transition to compliant alternatives. For new designs, verifying RoHS-compliant 1.8 µH inductor alternatives (potentially with different DCR or core characteristics) is prudent to ensure long-term supply security. Existing designs using the IMC1812BN1R8K should document the exemption rationale and monitor for discontinuation risk.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale IMC1812BN1R8K

Product Attribute IMC1812BN1R8J IMC1812BN181K IMC1812BN1R2K IMC1812BN1R0K
Part Number IMC1812BN1R8J IMC1812BN181K IMC1812BN1R2K IMC1812BN1R0K
Manufacturer Vishay Dale Vishay Dale Vishay Dale Vishay Dale
Inductance Frequency - Test - - - -
DC Resistance (DCR) - - - -
Tolerance - - - -
Frequency - Self Resonant - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Size / Dimension - - - -
Series - - - -
Q @ Freq - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current - Saturation (Isat) - - - -
Type - - - -
Shielding - - - -
Current Rating (Amps) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Ratings - - - -
Material - Core - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Inductance - - - -
Height - Seated (Max) - - - -

IMC1812BN1R8K Datasheet PDF

Download IMC1812BN1R8K pdf datasheets and Vishay Dale documentation for IMC1812BN1R8K - Vishay Dale.

HTML Datasheet
IMC1812.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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IMC1812BN1R8K Image

IMC1812BN1R8K

Vishay Dale
98D-IMC1812BN1R8K

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