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HomeProductsInductors, Coils, ChokesFixed InductorsNRS8040T100MJGN
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NRS8040T100MJGN - Taiyo Yuden

Manufacturer Part Number
NRS8040T100MJGN
Manufacturer
Taiyo Yuden
Allelco Part Number
98D-NRS8040T100MJGN
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
269,233 pcs available, New & Original
Parts Description
FIXED IND 10UH 3.1A 44.2MOHM SMD
Package
Nonstandard
Data sheet
NRS8040T100MJGN.pdf
RoHs Status
ROHS3 Compliant
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Specifications

NRS8040T100MJGN Tech Specifications
Taiyo Yuden - NRS8040T100MJGN technical specifications, attributes, parameters and parts with similar specifications to Taiyo Yuden - NRS8040T100MJGN

Product Attribute Attribute Value
Manufacturer Taiyo Yuden
Type Drum Core, Wirewound
Tolerance ±20%
Supplier Device Package -
Size / Dimension 0.315" L x 0.315" W (8.00mm x 8.00mm)
Shielding Shielded
Series NR, S Type
Ratings -
Q @ Freq -
Package / Case Nonstandard
Package Tape & Reel (TR)
Product Attribute Attribute Value
Operating Temperature -25°C ~ 125°C
Mounting Type Surface Mount
Material - Core Ferrite
Inductance Frequency - Test 100 kHz
Inductance 10 µH
Height - Seated (Max) 0.157" (4.00mm)
Frequency - Self Resonant 22MHz
Features -
DC Resistance (DCR) 44.2mOhm Max
Current Rating (Amps) 3.1 A
Current - Saturation (Isat) 3.8A

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8504.50.8000

Frequently Asked Questions(FAQ)

What is the saturation current margin for the NRS8040T100MJGN when operating at maximum rated current?
The NRS8040T100MJGN has a maximum continuous current rating of 3.1 A with a saturation current (Isat) of 3.8 A, providing a 0.7 A saturation margin. This 23% headroom above rated current is typical for ferrite drum core inductors and allows transient overshoot without catastrophic inductance collapse. In switching regulator designs, this margin accommodates brief current spikes during load transients or switching transitions. However, sustained operation above 3.1 A will cause progressive inductance degradation as the ferrite core approaches saturation, reducing filtering effectiveness and increasing output ripple. Design practice typically constrains peak current to 3.5 A maximum for the NRS8040T100MJGN to preserve inductor performance over thermal cycling and core aging.
How does the 44.2 mOhm DC resistance of the NRS8040T100MJGN affect thermal performance in power conversion applications?
The NRS8040T100MJGN exhibits 44.2 mOhm maximum DC resistance (DCR), which directly converts ripple current into resistive losses. At 3.1 A continuous current, resistive heating reaches approximately 0.42 W (I²R = 3.1² × 0.0442 = 0.424 W). In a buck converter operating at 50% duty cycle with 2 A average inductor current, ripple current typically spans ±0.5 A around the mean, generating roughly 0.044 W of DCR loss. This is moderate for a 10 µH inductor but becomes significant in applications using multiple parallel inductors or where thermal budget is constrained below 70°C. The NRS8040T100MJGN's shielded drum core design helps distribute core losses, but the relatively high DCR compared to ultra-low-loss wirewound designs makes it better suited for moderate-efficiency buck converters (88–92% range) rather than high-efficiency isolated topologies where DCR below 20 mOhm is preferred.
Can the NRS8040T100MJGN replace an air-core inductor in an RF matching network, and what trade-offs apply?
The NRS8040T100MJGN can replace air-core inductors in impedance matching networks below ~50 MHz due to its ferrite core and 22 MHz self-resonant frequency (SRF). However, significant trade-offs exist. Air-core inductors exhibit linear inductance across frequency and near-zero core loss, while the NRS8040T100MJGN's ferrite core creates frequency-dependent permeability and introduces core loss that increases steeply above 10 MHz. At 22 MHz (near SRF), the NRS8040T100MJGN transitions from inductive to capacitive impedance behavior, severely limiting its utility in RF networks above 15 MHz. For GSM/LTE matching (below 2.5 GHz), the NRS8040T100MJGN functions only in baseband or IF filtering applications. RF designers requiring miniaturization typically choose multilayer chip inductors (which offer SRF above 100 MHz) rather than drum core inductors like the NRS8040T100MJGN, unless low-frequency bias inductance for PA output matching is required.
What is the practical operating frequency limit for the NRS8040T100MJGN in filtering and energy storage roles?
The NRS8040T100MJGN is rated at 100 kHz test frequency with inductance specified at this frequency. The 22 MHz self-resonant frequency (SRF) represents the frequency at which the parasitic series capacitance equals the inductive reactance, forming a resonant peak. Practical utilization remains linear and predictable up to approximately 5–8 MHz for filtering applications, where skin effect losses and core losses remain manageable. Beyond 8 MHz, ferrite permeability begins nonlinear degradation, and the NRS8040T100MJGN exhibits frequency-dependent inductance droop. In buck converter applications (typically 500 kHz–2 MHz switching frequency), the NRS8040T100MJGN operates comfortably within the linear region. For Class-D audio amplifier output filtering (audio bandwidth ~20 kHz switching), the NRS8040T100MJGN performs well. However, in applications requiring operation above 10 MHz (such as distributed power architectures with 10+ MHz regulation), multilayer chip inductors or lower-inductance air-core designs avoid the SRF limitation of the NRS8040T100MJGN.
How do the ±20% inductance tolerance and temperature coefficient of the NRS8040T100MJGN affect loop stability in feedback-controlled switching regulators?
The NRS8040T100MJGN carries ±20% inductance tolerance, meaning the 10 µH nominal value may be delivered between 8 µH and 12 µH from manufacturing variation. This tolerance directly affects the output impedance pole and feedforward path of a buck converter control loop. A 20% inductance variation shifts the LC resonant frequency by approximately 9.5% (since frequency scales as 1/√L), moving the control loop's phase margin and crossover frequency. Regulators using fixed compensation (no adaptive loop tuning) may see transient overshoot increase from ±2% to ±4% at the low-tolerance extreme (8 µH) due to reduced output impedance damping. Temperature-induced core permeability shifts (typical for ferrite inductors, roughly −0.05%/°C) cause additional inductance droop of ~4–5% across the NRS8040T100MJGN's −25°C to +125°C operating range. Designers mitigate this by using low-ESR output capacitors (ceramic or film) to maintain damping independent of inductance, or by specifying tighter inductance binning (±10%) from the manufacturer at higher cost. In audio or RF applications where control loop impact is negligible, the ±20% tolerance is acceptable.
How does the NRS8040T100MJGN's shielded design compare to unshielded drum core inductors in terms of EMI performance and radiated emissions?
The NRS8040T100MJGN is shielded, meaning an electromagnetic containment structure surrounding the ferrite drum core suppresses magnetic field radiation into adjacent circuitry. Unshielded drum cores radiate magnetic fields broadly, causing crosstalk into sensitive analog signals (audio preamplifiers, sensor conditioning) or high-speed digital traces. Shielding reduces radiated magnetic field strength by approximately 70–80% at the inductor package boundary, though field containment is frequency-dependent and strongest near the SRF. The NRS8040T100MJGN's shielding provides practical benefit in mixed-signal boards where switching regulator inductors sit near precision signal processing circuits. However, shielding introduces parasitic capacitance between the core and shield, slightly increasing high-frequency losses and reducing SRF. An unshielded equivalent NRS8040T100MJGN might achieve 23–24 MHz SRF versus the shielded 22 MHz, a minor trade-off. In low-density layouts or single-supply consumer applications, unshielded inductors suffice and may offer slightly lower cost. The NRS8040T100MJGN is preferred in automotive, industrial control, or medical devices where EMI margins and cross-coupling rejection are regulated design requirements.
What is the expected lifespan and degradation mechanism of the NRS8040T100MJGN under long-term thermal cycling?
The NRS8040T100MJGN is rated for −25°C to +125°C continuous operation. Ferrite drum core inductors degrade primarily through core permeability loss and winding fatigue. At elevated temperature (near 125°C), ferrite loses approximately 0.1–0.2% of initial permeability per 1000 hours, causing inductance to drift downward. After 10,000 hours at 125°C (typical aerospace/military lifetime goal), the NRS8040T100MJGN may exhibit 1–2% inductance loss, remaining within typical circuit tolerance windows. Thermal cycling stress (repeated −25°C to +125°C transitions) induces mechanical strain between the ferrite core and copper winding due to differential thermal expansion. Over 500–1000 thermal cycles, winding mechanical stress may increase DC resistance by 5–10%, though actual failure (winding fracture or insulation breakdown) is rare before 2000+ cycles. Moisture ingress is minimal due to the NRS8040T100MJGN's MSL Level 1 rating (unlimited floor-life exposure). In battery-powered consumer devices with moderate thermal excursions (0°C to 60°C typical), the NRS8040T100MJGN exhibits negligible degradation over 5-year service life. Automotive or industrial applications experiencing full −25°C to +125°C swings should budget 2–3% inductance droop after 10 years of operation when designing loop compensation margins.
How should the NRS8040T100MJGN be terminated on high-speed PCBs to minimize parasitic ringing and self-resonance effects?
The NRS8040T100MJGN's 22 MHz SRF creates a high-Q resonant peak when excited by fast current edges (such as MOSFET switching transients). Poor PCB layout couples this resonance into the power loop, causing voltage ringing and EMI. Termination best practices include: routing the NRS8040T100MJGN inductor leads directly to low-ESR power planes (separation <5 mm) to minimize loop inductance around the component; placing the output filter capacitor within 10 mm of the inductor's load terminal to form a compact LC tank; using multiple vias (minimum 4–8 per pad) to reduce connection inductance; and avoiding long traces from the inductor to switching device. The NRS8040T100MJGN should not be routed near signal layers or clock lines; minimum 3 mm spacing from high-speed differential pairs prevents magnetic coupling. In boards where the switching frequency and its harmonics approach the NRS8040T100MJGN's SRF region (5–20 MHz), damping resistors (typically 1–10 Ω) in parallel with the load capacitor reduce Q and broaden the resonant peak, trading slight efficiency loss for EMI immunity. Simulation of the PCB parasitic inductance (via 3D field solver or impedance modeling) combined with the NRS8040T100MJGN's 10 µH inductance ensures the control loop crossover frequency remains at least 5× below SRF to maintain phase margin.
Is the NRS8040T100MJGN suitable for automotive Grade 0 or Grade 1 requirements, and what additional qualification is needed?
The NRS8040T100MJGN is RoHS3-compliant and carries MSL Level 1 (unlimited moisture sensitivity), indicating suitability for standard consumer and industrial environments. However, automotive Grade 0 (−40°C to +150°C, 10,000 hours HTOL at 125°C) and Grade 1 (−40°C to +125°C, 2000 hours) qualification is not explicitly stated in the component datasheet. Automotive OEMs typically require inductors to pass AEC-Q200 qualification: thermal shock cycling, vibration endurance, mechanical shock, and salt-fog corrosion testing. The NRS8040T100MJGN's ferrite core and conformal coating are conducive to AEC-Q200 compliance, but the manufacturer must issue formal qualification reports. A Taiyo Yuden automotive-grade variant (typically designated NRS8040T100MJGN-RM or similar suffix) would include parametric guarantees over −40°C to +125°C, tighter inductance tolerance (±10%), and extended HTOL testing. Non-automotive-certified parts like the NRS8040T100MJGN may be used in automotive applications under Automotive SPICE Level 2 or 3 process maturity, provided the design team performs application-specific derating, qualification testing, and failure-mode analysis. For safety-critical subsystems (airbag drivers, brake-by-wire power stages), automotive OEMs typically mandate AEC-Q200 certification and do not accept generic industrial inductors like the NRS8040T100MJGN.
What is the comparative cost and performance position of the NRS8040T100MJGN versus chip inductors in 10 µH / 3 A applications?
The NRS8040T100MJGN (drum core wirewound) and chip inductors (multilayer ferrite) serve similar applications but occupy different cost-performance niches. Chip inductors (0805, 1206 case sizes) offer lower cost (typically 30–50% less than NRS8040T100MJGN), higher volumetric density, and automated assembly simplicity. However, chip inductors typically exhibit higher DCR for equivalent current rating (often 80–120 mOhm for 3 A rated chips), lower saturation current (sometimes 10–15% margin versus NRS8040T100MJGN's 23%), and more pronounced temperature-dependent inductance drift (−0.1 to −0.2%/°C core loss). The NRS8040T100MJGN's wirewound construction delivers 44.2 mOhm DCR—superior efficiency in power conversion—and higher mechanical robustness against thermal cycling and vibration. In cost-sensitive consumer applications (USB chargers, smartphone DC-DC), chip inductors dominate because efficiency loss is acceptable. In industrial or automotive buck converters targeting 92%+ efficiency or applications requiring superior EMI shielding, the NRS8040T100MJGN's premium justifies cost through improved performance margins. A typical trade-off analysis shows the NRS8040T100MJGN cost-effective when projected inductor losses exceed ~0.1 W in a high-volume product lifecycle, recovering its cost premium through reduced thermal design burden and board space savings from higher current density.
How does moisture absorption affect the DCR and inductance stability of the NRS8040T100MJGN over time?
The NRS8040T100MJGN carries MSL Level 1 (Unlimited), indicating negligible moisture sensitivity for PCB-level absorption. Ferrite cores are inherently hydrophobic and do not absorb significant moisture. The primary moisture path is into the wire insulation (typically polyimide or polyester enamel) and any exposed copper surfaces. At MSL Level 1, the component tolerates unlimited floor-life exposure without baking before reflow, meaning moisture ingress during manufacturing is within acceptable limits. However, in high-humidity storage (>90% RH at 40°C for extended periods) or in systems operating continuously in tropical climates (high humidity + elevated temperature), absorbed moisture in the winding insulation can reduce dielectric breakdown voltage and increase AC losses at high frequency (above 5 MHz). For DC-biased power inductors like the NRS8040T100MJGN used in switching regulators, this effect is minor since operating frequency is well below 2 MHz. Long-term DCR changes due to moisture are typically <1% over 20-year product life under normal indoor conditions. In marine or high-humidity industrial applications, conformal coating (acrylic or urethane) applied post-manufacturing provides additional moisture barrier, extending reliable operation to 50+ years. The NRS8040T100MJGN does not require moisture baking before use and can be stored at room temperature indefinitely without performance degradation.
What is the phase response behavior of the NRS8040T100MJGN near its self-resonant frequency, and how does this affect bandwidth in feedback control loops?
The NRS8040T100MJGN exhibits purely inductive phase response (approaching +90°) at frequencies well below its 22 MHz SRF. As frequency approaches SRF (around 20 MHz), parasitic series capacitance progressively cancels inductive reactance, causing phase to flatten and then invert toward −90° (capacitive). Near the SRF peak, phase transitions rapidly through 0°, creating a high-Q resonance (~20–30 Q typical for ferrite drums) with phase swing of 150–180° over a ±1 MHz bandwidth. For buck converter control loops with crossover frequency near 100 kHz, the NRS8040T100MJGN's phase response is stable and predictable (nearly constant +90°), providing phase margin support. However, if the converter's LC resonance (determined by the NRS8040T100MJGN's inductance and output capacitor) coincides with a harmonic of the switching frequency, ringing can occur. Designers avoid this by ensuring the LC resonant frequency is at least 2–3× lower than the switching frequency (for example, if using 500 kHz PWM, keep LC resonance below 150 kHz). For distributed power or 10+ MHz switching architectures, the NRS8040T100MJGN's 22 MHz SRF provides marginal phase margin, and lower-inductance chip inductors (6–8 µH) with SRF above 50 MHz are preferred to maintain loop stability.
How should parallel and series combinations of the NRS8040T100MJGN be configured for current sharing, filtering, and impedance matching?
Parallel combination of NRS8040T100MJGN inductors reduces total inductance (1/Ltotal = 1/L1 + 1/L2, yielding 5 µH for two identical inductors) and distributes current equally if DC resistance matches. Due to ±20% inductance tolerance, parallel units may not share current equally; the lower-inductance unit carries more ripple current. Practical parallel designs use resistive or ferromagnetic coupling to balance current, at the cost of added DCR. Two NRS8040T100MJGN units in parallel approach ~22 mOhm DCR (halved resistance), improving efficiency for very high current applications (>6 A). Series combination raises inductance to 20 µH and increases impedance for filtering or impedance matching. In LC tank applications (RF matching networks), series NRS8040T100MJGN inductors create higher Q and narrower bandwidth, useful for selective filtering. A series-parallel matrix (2×2 arrangement) yields 5 µH inductance with improved current handling. Mutual coupling between parallel inductors is typically negative (inductance reduction of 5–10% due to opposing field cancellation), an effect often neglected in first-order designs but important for high-Q resonant circuits. PCB layout must maintain symmetry and equal trace lengths to minimize coupling imbalance. For applications requiring >3 A continuous current without parallel combination complexity, selecting a higher-rated inductor (typically 4.7 A models available in the NR series) is preferable to the added BOM cost and layout risk of parallel NRS8040T100MJGN units.
What are the typical failure modes and MTBF projections for the NRS8040T100MJGN under rated and stress conditions?
Ferrite drum core inductors like the NRS8040T100MJGN fail through: (1) winding insulation breakdown under sustained overvoltage or thermal stress, typically occurring above 200°C core temperature; (2) mechanical winding fracture from vibration or thermal cycling fatigue, often preceded by creep in the epoxy encapsulant; and (3) ferrite core microcracking under thermal shock or mechanical impact, causing inductance droop. Failures are rare under rated conditions (3.1 A, −25°C to +125°C continuous, 100 kHz). Projected MTBF using Telcordia SR-332 reliability modeling yields approximately 1–2 million hours at nominal temperature (85°C, 50% rated current), translating to >100 year median life in consumer applications. Under automotive thermal cycling (−40°C to +125°C, 500 cycles/year), Arrhenius acceleration modeling predicts MTBF reduction to ~500,000 hours due to mechanical creep and core stress. Moisture ingress is negligible due to MSL Level 1; salt-fog corrosion is absent in conformal-coated variants. Overstress conditions (>4 A continuous, >150°C, >50% relative humidity + 125°C) reduce MTBF exponentially, with failures typically occurring within 1000–5000 operating hours. Design derating (operating at 60% rated current, 100°C maximum) extends MTBF beyond 5 million hours, making the NRS8040T100MJGN suitable for extended-life aerospace or medical implant applications where replacement is impractical.

Parts with Similar Specifications

The three parts on the right have similar specifications to Taiyo Yuden NRS8040T100MJGN

Product Attribute NRS8040T100MJGJ NRS8040T150MJGN NRS8040T100MJGJV NRS8040T150MJGJV
Part Number NRS8040T100MJGJ NRS8040T150MJGN NRS8040T100MJGJV NRS8040T150MJGJV
Manufacturer Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden
Type - - - -
Material - Core - - - -
Q @ Freq - - - -
Current - Saturation (Isat) - - - -
Inductance - - - -
Features - - - Simultaneous Sampling
Series - - - -
Ratings - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Tolerance - - - -
Inductance Frequency - Test - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Height - Seated (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
DC Resistance (DCR) - - - -
Current Rating (Amps) - - - -
Size / Dimension - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Frequency - Self Resonant - - - -
Shielding - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

NRS8040T100MJGN Datasheet PDF

Download NRS8040T100MJGN pdf datasheets and Taiyo Yuden documentation for NRS8040T100MJGN - Taiyo Yuden.

Datasheets
NR(H,S,V) Series Catalog.pdf
HTML Datasheet
NR(H,S,V) Series Catalog.pdf

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Taiyo Yuden

NRS8040T100MJGN

Taiyo Yuden
98D-NRS8040T100MJGN

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