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HomeProductsInductors, Coils, ChokesFixed InductorsNRS8040T1R0NJGJ
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NRS8040T1R0NJGJ - Taiyo Yuden

Manufacturer Part Number
NRS8040T1R0NJGJ
Manufacturer
Taiyo Yuden
Allelco Part Number
98D-NRS8040T1R0NJGJ
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
35,317 pcs available, New & Original
Parts Description
FIXED IND 1UH 7.8A 7.8 MOHM SMD
Package
Nonstandard
Data sheet
NRS8040T1R0NJGJ.pdf
RoHs Status
ROHS3 Compliant
Our certification
In stock: 35317
  • Unit Price: $0.207
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.207 $0.21
10+ $0.168 $1.68
30+ $0.152 $4.56
100+ $0.131 $13.10
500+ $0.122 $61.00
1000+ $0.117 $117.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

NRS8040T1R0NJGJ Tech Specifications
Taiyo Yuden - NRS8040T1R0NJGJ technical specifications, attributes, parameters and parts with similar specifications to Taiyo Yuden - NRS8040T1R0NJGJ

Product Attribute Attribute Value
Manufacturer Taiyo Yuden
Type Drum Core, Wirewound
Tolerance ±30%
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 ~ 120°C
Mounting Type Surface Mount
Material - Core Ferrite
Inductance Frequency - Test 100 kHz
Inductance 1 µH
Height - Seated (Max) 0.165" (4.20mm)
Frequency - Self Resonant 85MHz
Features -
DC Resistance (DCR) 7.8mOhm Max
Current Rating (Amps) 7.8 A
Current - Saturation (Isat) 13A

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 are the practical saturation current limits when designing with the NRS8040T1R0NJGJ inductor in power delivery applications?
The NRS8040T1R0NJGJ specifies a saturation current (Isat) of 13A, which represents approximately 67% above the rated continuous current of 7.8A. In real design scenarios, saturation becomes a hard constraint for transient current spikes or fault conditions. Operating the NRS8040T1R0NJGJ near saturation causes inductance collapse and dramatic DCR-driven power loss. For buck converters or synchronous rectification topologies, designers must account for peak inductor current during load step transients; exceeding 13A with the NRS8040T1R0NJGJ will degrade L-value and thermal performance. A practical design margin of 15–20% below Isat is typical, limiting safe peak current to approximately 10.5–11A for the NRS8040T1R0NJGJ.
How does the 7.8mOhm DCR of the NRS8040T1R0NJGJ affect efficiency in low-voltage switching applications?
The NRS8040T1R0NJGJ exhibits 7.8mOhm maximum DC resistance, which directly translates to conduction losses proportional to I². For a 5V/10A buck converter using the NRS8040T1R0NJGJ, steady-state inductor loss equals (7.8A)² × 0.0078Ω ≈ 475mW. At higher switching frequencies, AC resistance (skin effect) increases losses further, but the NRS8040T1R0NJGJ datasheet typically characterizes DCR at test conditions without frequency derating. In power-dense designs, this DCR contribution can reduce converter efficiency by 1–3% depending on current profile and thermal environment. The 7.8mOhm specification for the NRS8040T1R0NJGJ assumes room temperature and must be derated 0.4–0.6%/°C for elevated operating conditions within the –25°C to 120°C range.
Why is the self-resonant frequency of 85MHz critical when the NRS8040T1R0NJGJ operates at much lower frequencies like 1MHz?
The NRS8040T1R0NJGJ self-resonant frequency (SRF) of 85MHz represents the frequency where parasitic distributed capacitance causes the inductor to transition from inductive to capacitive behavior. Although this appears far removed from typical switching frequencies (300kHz–5MHz), the SRF margin is essential for transient stability and EMI filtering. At frequencies approaching or exceeding the SRF, the NRS8040T1R0NJGJ impedance curve rolls over, reducing filtering effectiveness and increasing noise coupling to adjacent circuits. For the NRS8040T1R0NJGJ, the 85MHz SRF confirms that operations below 8–10MHz remain solidly in the inductive regime (typically 4–5× design margin). Exceeding this margin—such as in high-frequency DC-DC applications or high-speed digital circuits—requires confirming impedance plots rather than relying on nominal L specification alone.
How does the ±30% inductance tolerance of the NRS8040T1R0NJGJ impact loop stability in current-mode control topologies?
The NRS8040T1R0NJGJ carries ±30% inductance tolerance, meaning production units can range from 0.7µH to 1.3µH. In current-mode controlled converters, loop gain and stability margin depend directly on inductor value; the NRS8040T1R0NJGJ tolerance band can shift phase margin by 8–15° across the production population. Designs relying on tight loop tuning or minimal phase margin headroom may exhibit instability or oscillation with worst-case high-inductance variants of the NRS8040T1R0NJGJ. Practical mitigation includes: selecting the lowest expected inductance (0.7µH) for control loop design, adding proportional-integral filtering to compensate, or screening prototype units of the NRS8040T1R0NJGJ across the tolerance band. For voltage-mode topologies, tolerance impact is typically lower; current-mode and hysteretic designs demand explicit tolerance analysis.
What are the thermal management considerations when the NRS8040T1R0NJGJ operates continuously at its 7.8A rating?
At 7.8A continuous current, the NRS8040T1R0NJGJ dissipates approximately 475mW (I²R loss). The compact 8mm × 8mm × 4.2mm footprint limits heat spreading; without thermal vias or high-copper PCB layers, junction temperature of the NRS8040T1R0NJGJ will rise 40–60°C above ambient under typical board conditions. Operating within the –25°C to 120°C range specified for the NRS8040T1R0NJGJ, sustained 7.8A in a 50°C ambient environment may approach or exceed safe operating limits. DCR increases with temperature at approximately 0.4–0.5%/°C, creating a destabilizing feedback loop: higher current → higher temperature → higher DCR → higher losses. For extended 7.8A operation, designers should: implement thermal vias (multiple 0.3mm vias under the NRS8040T1R0NJGJ pad), use internal copper layers for heat spreading, or derate current below 7A to maintain margin. Pulsed operation at 7.8A with duty cycles below 30–40% avoids this concern.
How does the NRS8040T1R0NJGJ compare to competing 1µH shielded inductors in terms of saturation performance and DCR trade-offs?
The NRS8040T1R0NJGJ offers 13A saturation current paired with 7.8mOhm DCR in an 8×8×4.2mm footprint. Competing designs like SDCH1V8040-1R0N-R or BWVT alternatives typically target similar performance envelopes but diverge in saturation curve shape and frequency response. The NRS8040T1R0NJGJ achieves saturation current through optimized ferrite core geometry and winding density; comparable inductors often trade lower DCR (5–6mOhm) for reduced saturation margin (10–11A), or accept higher DCR (9–10mOhm) to reach similar saturation. The substitutes listed (SDCH1V8040-1R0N-R, BWVT008080401R0M00, BWVT008080401R0T00) provide functional equivalents, but the NRS8040T1R0NJGJ is preferred for applications requiring the full 7.8A continuous rating; alternatives may exhibit thermal drift or saturation softness at the extremes. Direct comparison requires impedance plots across the operating temperature range; component selection should prioritize saturation margin and thermal stability of the NRS8040T1R0NJGJ over marginal DCR improvements in competing parts.
What mounting and thermal interface considerations apply when using the NRS8040T1R0NJGJ in high-current switching supplies?
The NRS8040T1R0NJGJ surface mount construction (tape & reel packaging) on an 8×8mm nonstandard footprint requires careful land pattern design. Unlike standard 0805 or 1206 inductors, the NRS8040T1R0NJGJ pad geometry demands precise solder paste application and reflow profiling to ensure consistent mechanical and thermal contact. Solder joint quality directly affects thermal coupling to the PCB; cold or bridged joints can increase thermal resistance by 2–3× and limit heat dissipation. For the NRS8040T1R0NJGJ in high-current designs, implement: multiple thermal vias (≥0.3mm diameter, 2–3mm spacing) under all pads, internal ground/power planes in close proximity, and solder mask clearance to allow full wetting. The 4.2mm height of the NRS8040T1R0NJGJ is relatively low, supporting dense PCB routing but requiring careful consideration of component stacking and airflow. Automated optical inspection (AOI) should verify solder coverage on the NRS8040T1R0NJGJ to prevent thermal runaway during high-current transients.
Does the NRS8040T1R0NJGJ maintain stable inductance across its full –25°C to 120°C operating range, and how should temperature coefficients be incorporated into design calculations?
The NRS8040T1R0NJGJ operates across –25°C to 120°C, but ferrite-core inductors exhibit nonlinear temperature coefficients. Inductance typically decreases by 0.5–1.5% per 100°C rise; the NRS8040T1R0NJGJ's ferrite composition places it near the mid-range of this band. At 120°C, the NRS8040T1R0NJGJ nominal 1µH could degrade to 0.95–0.97µH, a 3–5% shift within the ±30% tolerance but still meaningful for sensitive loop designs. DCR increases more aggressively at elevated temperature (0.4–0.6%/°C), so a NRS8040T1R0NJGJ unit at 120°C exhibits not only reduced inductance but also 48–72% higher resistance than at 25°C. For designs spanning the full temperature range, use the worst-case DCR at maximum temperature (120°C) and lowest inductance (accounting for tolerance and temperature drift) when calculating conduction losses and control loop response. At minimum temperature (–25°C), inductance peaks and DCR is minimized; the NRS8040T1R0NJGJ may show higher peak current capability but reduced loss. Temperature compensation or adaptive control is recommended for precision current-mode converters using the NRS8040T1R0NJGJ.
What EMI filtering performance can be expected from the NRS8040T1R0NJGJ in switch-mode power supply input or output stages?
The NRS8040T1R0NJGJ is a shielded drum-core inductor optimized for EMI suppression up to approximately 50–70MHz (well below the 85MHz SRF). Shielding reduces magnetic field radiation and crosstalk to adjacent traces by 15–25dB compared to unshielded designs. For input filter applications (line-frequency or high-voltage DC input), the NRS8040T1R0NJGJ paired with appropriate capacitors creates an LC filter with –20dB/decade attenuation above the corner frequency. With typical SMPS switching frequencies (300kHz–2MHz), the NRS8040T1R0NJGJ (1µH) corner frequency with a 10µF capacitor is approximately 1.6kHz, providing strong attenuation at switching harmonics. However, the NRS8040T1R0NJGJ's 7.8mOhm DCR and ferrite core losses limit Q-factor to modest values (typically 10–20 at 1MHz), reducing resonance peaking and damping ringing. For output filters demanding high rejection (–60dB+), multi-stage cascades or higher-inductance alternatives to the NRS8040T1R0NJGJ may be necessary; single-stage NRS8040T1R0NJGJ filters are suitable for moderate suppression (–30 to –40dB) in moderate-bandwidth applications.
How do moisture sensitivity level (MSL) 1 specifications for the NRS8040T1R0NJGJ affect board assembly and storage procedures?
The NRS8040T1R0NJGJ carries MSL 1 (Unlimited), meaning there are no moisture absorption restrictions, indefinite shelf life at room conditions, and no pre-reflow baking required. This stands in contrast to MSL 2–5 components, which demand vacuum-sealed packaging and bake cycles before soldering. The NRS8040T1R0NJGJ can be stored in standard warehouse conditions without special humidity control, simplifying inventory management and reducing lead times on prototype builds. However, MSL 1 does not imply immunity to solder reflow damage; the NRS8040T1R0NJGJ is still subject to thermal shock and solder joint fatigue during assembly. Reflow profile compliance (peak temperature 245–260°C, ramp rates 2–3°C/s) remains mandatory. For high-reliability applications, even MSL 1 components like the NRS8040T1R0NJGJ benefit from controlled storage (5–40% RH) to minimize solder oxidation and extend component shelf life beyond the unlimited MSL 1 baseline.
What is the design impact of the NRS8040T1R0NJGJ's ±30% tolerance when used in parallel-inductor configurations for current sharing?
In parallel-inductor designs (common in high-current applications), matching inductance value is critical for even current distribution. The NRS8040T1R0NJGJ ±30% tolerance creates a worst-case mismatch of 60% between a 0.7µH unit and a 1.3µH unit. Due to lower impedance dominance, the lower-inductance NRS8040T1R0NJGJ branch will draw disproportionately high current, while the higher-inductance branch remains underutilized. Current imbalance can exceed 30–40% under steady-state conditions, concentrating stress and losses in one inductor. For parallel designs using the NRS8040T1R0NJGJ, either: select matched pairs from the same manufacturing lot (requiring screening), include series resistors (increasing total loss), or employ active current-sharing feedback in the PWM controller. Passive matching within ±5–10% of nominal 1µH requires hand-selection, which is typically infeasible for production volume. Alternatively, substitute custom-matched inductor arrays or use higher-tolerance parts (±10%) at penalty to specific performance.
How does the nonstandard 8×8mm package of the NRS8040T1R0NJGJ affect PCB layout, sourcing, and long-term availability?
The NRS8040T1R0NJGJ is classified as nonstandard packaging, unlike industry-standard 0805, 1206, or 1812 footprints. Nonstandard packages create design-lock risk: CAD libraries may lack the correct footprint, automated routing tools may not recognize the NRS8040T1R0NJGJ pad geometry, and layout designers unfamiliar with the part may introduce errors. Sourcing is complicated by limited second-source availability; while substitutes (SDCH1V8040-1R0N-R, BWVT variants) exist, they may not share identical land patterns. Long-term availability of the NRS8040T1R0NJGJ is dependent on Taiyo Yuden's product line decisions; discontinuation would require costly board redesign and qualification cycles. For new designs, confirm the NRS8040T1R0NJGJ is in active production with stable lead times (typically 8–12 weeks for specialty parts). If design longevity exceeds 5–7 years, negotiate long-term supply agreements or identify qualified second sources with identical footprint compatibility. Prototype and pilot builds should validate footprint accuracy and solder processes specific to the NRS8040T1R0NJGJ before committing to high-volume production.
What ferrite core characteristics and saturation behavior govern the NRS8040T1R0NJGJ's performance envelope, and how do they influence inductor selection for specific applications?
The NRS8040T1R0NJGJ uses ferrite drum-core construction, which offers moderate saturation flux density (typically 350–400mT for Ni-Zn ferrite), a soft saturation curve, and low core loss across the –25°C to 120°C operating window. Ferrite saturation is gentler than iron-powder cores; the NRS8040T1R0NJGJ inductance gradually decreases as current approaches 13A Isat, rather than collapsing abruptly. This behavior is favorable for current-limiting or fault-tolerance applications, where inductor softness provides natural current derating. Core loss in the NRS8040T1R0NJGJ is relatively low at switching frequencies below 2MHz; above 5MHz, eddy current and hysteresis losses become significant. The ferrite selection also affects temperature stability: Ni-Zn compositions used in the NRS8040T1R0NJGJ are more stable than Mn-Zn across temperature extremes. However, ferrite saturation flux density is lower than iron-powder alternatives, limiting maximum energy storage density. For applications requiring ultra-low DCR (5mOhm or less), high-permeability ferrites used in competing designs may saturate harder or exhibit worse temperature coefficients than the NRS8040T1R0NJGJ. Selection depends on prioritizing saturation margin, DCR, and thermal stability—the NRS8040T1R0NJGJ balances all three moderately rather than optimizing any single parameter.

Parts with Similar Specifications

The three parts on the right have similar specifications to Taiyo Yuden NRS8040T1R0NJGJ

Product Attribute NRS8040T1R4NJGJ NRS8040T1R5NJGJ NRS8040T1R4NJGJV NRS8040T2R0NJGJ
Part Number NRS8040T1R4NJGJ NRS8040T1R5NJGJ NRS8040T1R4NJGJV NRS8040T2R0NJGJ
Manufacturer Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden
Frequency - Self Resonant - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Inductance - - - -
Inductance Frequency - Test - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
DC Resistance (DCR) - - - -
Shielding - - - -
Tolerance - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Size / Dimension - - - -
Type - - - -
Q @ Freq - - - -
Current - Saturation (Isat) - - - -
Features - - - Simultaneous Sampling
Height - Seated (Max) - - - -
Ratings - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current Rating (Amps) - - - -
Material - Core - - - -

NRS8040T1R0NJGJ Datasheet PDF

Download NRS8040T1R0NJGJ pdf datasheets and Taiyo Yuden documentation for NRS8040T1R0NJGJ - Taiyo Yuden.

Datasheets
NRS8040T1R0NJGJ Spec Sheet.pdf
PCN Part Status Change
Mult Devs NRND 01/Apr/2023.pdf
PCN Part Number
Mult Devs Part Number 23/Sep/2022.pdf
HTML Datasheet
NR(H,S,V) Series Catalog.pdf

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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NRS8040T1R0NJGJ

Taiyo Yuden
98D-NRS8040T1R0NJGJ

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