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HomeProductsInductors, Coils, ChokesFixed InductorsNRS8040T101MJGK
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NRS8040T101MJGK - Taiyo Yuden

Manufacturer Part Number
NRS8040T101MJGK
Manufacturer
Taiyo Yuden
Allelco Part Number
32D-NRS8040T101MJGK
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
144,930 pcs available, New & Original
Parts Description
FIXED IND 100UH 1A 364 MOHM SMD
Package
Nonstandard
Data sheet
NRS8040T101MJGK.pdf
RoHs Status
ROHS3 Compliant
Our certification
In stock: 144930
  • Unit Price: $0.173
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
5+ $0.173 $0.87
50+ $0.14 $7.00
150+ $0.126 $18.90
1000+ $0.108 $108.00
2000+ $0.10 $200.00
5000+ $0.096 $480.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

NRS8040T101MJGK Tech Specifications
Taiyo Yuden - NRS8040T101MJGK technical specifications, attributes, parameters and parts with similar specifications to Taiyo Yuden - NRS8040T101MJGK

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 ~ 120°C
Mounting Type Surface Mount
Material - Core Ferrite
Inductance Frequency - Test 100 kHz
Inductance 100 µH
Height - Seated (Max) 0.157" (4.00mm)
Frequency - Self Resonant 6MHz
Features -
DC Resistance (DCR) 364mOhm Max
Current Rating (Amps) 1 A
Current - Saturation (Isat) 1.1A

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 behavior of the NRS8040T101MJGK, and how does it compare to the 1A rated current?
The NRS8040T101MJGK has a saturation current (Isat) of 1.1A, which is only 100mA above its 1A continuous current rating. This narrow margin means the inductor enters saturation at just 110% of nominal operating current. In practical design, this requires careful current loop analysis—transient overshoot, inrush conditions, or load step responses that briefly exceed 1A will push the NRS8040T101MJGK into saturation, causing inductance to collapse and DC resistance to dominate, which degrades filtering performance and can generate heat. For buck converter or switching power supply applications using the NRS8040T101MJGK, this saturation headroom demands robust overcurrent protection and thermal margin verification during worst-case load transients.
Why does the NRS8040T101MJGK have such high DC resistance at 364mOhm, and what thermal impact should be expected?
The NRS8040T101MJGK's 364mOhm maximum DCR reflects the wirewound construction with ferrite drum core—this design prioritizes inductance density and shielding at the cost of resistive loss. At the 1A maximum continuous current rating, resistive dissipation reaches 364mW (I²R = 1² × 0.364Ω), generating non-trivial heat in the 8mm × 8mm footprint. Operating near the -25°C to 120°C temperature range upper limit will further increase winding resistance by approximately 0.4% per °C, compounding losses. For applications requiring efficiency >92% or where the NRS8040T101MJGK sits in thermally congested PCB regions, this DCR becomes a limiting factor; lower-DCR alternatives (typically 150–200mOhm in comparable inductances) trade off shielding performance and core loss characteristics.
How does the self-resonant frequency of 6MHz on the NRS8040T101MJGK affect usable bandwidth in high-frequency switching circuits?
The NRS8040T101MJGK's self-resonant frequency (SRF) of 6MHz marks the boundary where parasitic capacitance resonates with the inductance, causing impedance to peak then invert. Above 6MHz, the NRS8040T101MJGK behaves capacitively rather than inductively, eliminating filtering efficacy and potentially amplifying noise. In buck converter or boost converter topologies switching at 2–3MHz, the NRS8040T101MJGK remains safely inductive with usable margin. However, if the circuit contains significant harmonic energy or if PCB layout introduces stray coupling, spurious resonances can occur near or below the 6MHz SRF of the NRS8040T101MJGK. Designers must verify that switching harmonics and EMI filtering targets remain well below 6MHz; for applications requiring filtering above 4MHz, smaller or lower-inductance alternatives offer higher SRF and may be necessary.
What are the practical differences between the NRS8040T101MJGK shielded drum core design and unshielded wirewound inductors for PCB layout?
The NRS8040T101MJGK's shielded drum core construction confines magnetic field largely within the core material, reducing radiated EMI and susceptibility to external coupling compared to unshielded wirewound designs. This shielding allows the NRS8040T101MJGK to be placed closer to signal traces, sensitive analog circuits, or other inductors without mutual inductance degradation. However, the shielding structure increases the effective permeability and raises core loss, contributing to the higher DCR and thermal dissipation. Unshielded inductors typically exhibit lower DCR and lower core loss for equivalent inductance, but the NRS8040T101MJGK's shielded topology is preferable in mixed-signal or RF environments where crosstalk or radiation limits dominate design constraints. The tradeoff is efficiency versus noise immunity; the NRS8040T101MJGK sacrifices some efficiency to gain isolation and predictability in board layout.
Is the NRS8040T101MJGK suitable for input or output filtering in a 48V bus converter, and what are the limiting factors?
The NRS8040T101MJGK's 1A maximum rating and 100µH inductance make it suitable for output or secondary-side filtering in 48V bus converters where downstream loads draw <1A, or for lower-voltage auxiliary rails. However, for high-current primary-side or direct 48V bus filtering (typical currents 10–30A), the NRS8040T101MJGK is undersized. The 364mOhm DCR also limits application to lower-current stages; at higher currents, multiple NRS8040T101MJGK units in parallel would be required, introducing layout complexity and still producing significant losses. A 48V intermediate bus converter using the NRS8040T101MJGK would most effectively deploy it on isolated secondary windings or on low-current bias supplies rather than the main power path. The nonstandard 8mm × 8mm package footprint may also complicate parallel placement versus standard sizes.
How does the ±20% inductance tolerance of the NRS8040T101MJGK impact filter design and frequency response prediction?
The ±20% tolerance on the NRS8040T101MJGK means inductance can range from 80µH to 120µH across production lots and temperature variation. In feedback-controlled switching regulators, the NRS8040T101MJGK's inductance variation directly shifts the L-R time constant and output impedance zero frequency by ±20%, altering loop stability margins. A circuit tuned for nominal 100µH may exhibit marginal stability or excessive transient overshoot when an NRS8040T101MJGK from the lower tolerance tail (80µH) is installed. For applications requiring tight frequency response, the ±20% tolerance mandates either empirical testing across the tolerance range or selection of higher-grade inductors (typically ±10% or ±5%) at increased cost. Magnetic passivation, temperature drift, and current-dependent saturation effects introduce additional effective tolerance; the NRS8040T101MJGK's published ±20% is a lower bound on real-world variation.
Why is the NRS8040T101MJGK rated for only 1A when many comparable 100µH SMD inductors support 2–3A, and what does this imply about the core material or geometry?
The NRS8040T101MJGK's 1A current rating reflects a conservative design balancing saturation headroom, thermal dissipation, and core loss within the ferrite drum core geometry. The 1.1A saturation current (only 100mA margin) indicates the ferrite material is optimized for low DCR and compact size rather than high current capacity. Comparable 100µH inductors rated for 2–3A typically employ larger core cross-sections, higher-permeability materials, or different winding geometries—all increasing footprint or height. The NRS8040T101MJGK's compact 8mm × 8mm × 4mm form factor prioritizes space efficiency; this geometry constraint limits the achievable current rating. Designers selecting the NRS8040T101MJGK should recognize this as an inherent tradeoff: the nonstandard compact package delivers 100µH in minimal footprint at the cost of current capacity and thermal margin compared to standard 1210 or 1812 footprint alternatives.
What precautions are necessary when soldering the NRS8040T101MJGK in tape and reel form, given its MSL1 moisture sensitivity rating?
The NRS8040T101MJGK carries MSL1 (Moisture Sensitivity Level 1), indicating unlimited floor life after bag opening—the component tolerates indefinite exposure to standard cleanroom or lab humidity without bake-out. However, this MSL1 rating applies to the component itself; solder joint reliability still depends on PCB cleanliness and reflow profile. The NRS8040T101MJGK's small 8mm footprint and close lead spacing require precise solder paste deposition and reflow to avoid bridges or cold joints. When sourced from tape and reel, the NRS8040T101MJGK undergoes pick-and-place handling; verify nozzle vacuum levels to prevent component shift or tilt during placement. Standard lead-free reflow (peak 250°C) is appropriate for the NRS8040T101MJGK's ferrite core. Avoid thermal shock or rapid cooling, which can stress the lead bonds on the compact form factor. Post-reflow X-ray inspection is advisable for critical applications to detect internal voids or marginal connections on the NRS8040T101MJGK.
How does the NRS8040T101MJGK perform at temperature extremes within the -25°C to 120°C operating range, particularly regarding inductance and DCR drift?
Over the -25°C to 120°C operating range, the NRS8040T101MJGK experiences inductance drift primarily due to ferrite permeability changes and winding resistance increase. Ferrite permeability typically decreases 0.15–0.25% per °C in the positive temperature direction; a 100°C swing from -25°C to +75°C yields approximately 1.5–2.5% inductance reduction in the NRS8040T101MJGK. Conversely, DCR increases roughly 0.4% per °C; at +120°C operating temperature, the NRS8040T101MJGK's DCR can exceed 420mOhm (compared to 364mOhm nominal at 25°C), increasing resistive losses by >15%. In feedback-controlled applications, this combined drift in L and R shifts both the filter cutoff frequency and damping; thermal compensation or design margin is required. The NRS8040T101MJGK's relatively wide temperature range makes it suitable for automotive or industrial environments, but thermal modeling must account for these drifts, especially in stability-sensitive feedback loops.
Can the NRS8040T101MJGK be substituted with alternative 100µH inductors from other manufacturers, and what electrical parameters should be matched?
Direct substitution of the NRS8040T101MJGK depends on matching inductance (100µH ±tolerance), DCR (<364mOhm is preferred but higher values introduce losses), saturation current (>1.1A minimum), and form factor (8mm × 8mm × 4mm footprint). Alternatives from Murata, TDK, or Samsung typically offer better current ratings (2–3A) or lower DCR (150–250mOhm) at the expense of slightly larger footprints or higher cost. If the NRS8040T101MJGK's 364mOhm DCR is already a thermal bottleneck, substitution with a lower-DCR variant can significantly improve efficiency. However, SRF, shielding effectiveness, and core loss characteristics may differ; the substitute must be tested in the actual circuit to verify EMI performance and loop stability. The NRS8040T101MJGK's nonstandard package size (8.00mm × 8.00mm vs. standard 1210 or 1206) limits drop-in alternatives; verify PCB footprint compatibility before assuming substitution is feasible.
What is the expected core loss contribution of the NRS8040T101MJGK at typical switching frequencies, and how is it measured?
The NRS8040T101MJGK's core loss is not explicitly specified in typical datasheets but can be inferred from the Q factor (quality factor) measurement or empirical testing. At the 100kHz test frequency, core loss is embedded in the effective series resistance (ESR) of the NRS8040T101MJGK; high DCR (364mOhm) masks core loss under DC bias. AC loss in ferrite cores increases with frequency and flux density following a power law (typically proportional to f^1.5 to f^2.0); at switching frequencies of 200kHz to 1MHz, the NRS8040T101MJGK core loss becomes non-negligible. Measurement requires an impedance analyzer or LCR meter with AC excitation capability, sweeping frequency and recording the imaginary impedance component. For the NRS8040T101MJGK in actual switching circuits, core loss can be estimated by measuring heatsink temperature rise and subtracting I²R winding loss; the difference approximates core loss. The compact ferrite drum core of the NRS8040T101MJGK is designed for low cost and size; higher-loss ferrite materials are typical, so core loss at 500kHz and above can rival or exceed winding loss.
In what applications is the nonstandard 8mm × 8mm footprint of the NRS8040T101MJGK most advantageous, and where does it create sourcing or design challenges?
The NRS8040T101MJGK's compact 8mm × 8mm × 4mm footprint is advantageous in space-constrained designs such as smartphone chargers, USB-C power delivery controllers, or compact IoT module supplies where every millimeter of PCB area drives design feasibility. The nonstandard package also enables asymmetric designs where the NRS8040T101MJGK can be placed in tight corners or under dense component clusters. However, the nonstandard size creates design friction: CAD libraries may lack footprints, procurement lead times may be longer than commodity 1210 or 1206 sizes, and alternative sourcing becomes difficult if Taiyo Yuden supply is interrupted. PCB manufacturers must verify their via and trace design rules support the 8mm footprint; some shops impose minimum spacing or via restrictions for non-standard packages. For high-volume production, nonstandard components like the NRS8040T101MJGK increase qualification workload and may incur setup charges. In cost-sensitive or long-lifecycle products, the space savings of the NRS8040T101MJGK must offset potential supply risk and qualification overhead.
How should PCB layout be optimized to minimize EMI radiation from the NRS8040T101MJGK, and does shielding reduce layout constraints?
Although the NRS8040T101MJGK is shielded, its 100µH inductance and 1A current create time-varying magnetic fields; proper layout remains critical. The NRS8040T101MJGK should be placed with its long axis perpendicular to sensitive signal traces (particularly clock, data, or analog input lines) to minimize mutual inductance. A ground plane directly adjacent to the NRS8040T101MJGK's bottom side (via close via-stitching) reduces loop area and field strength. The shielding can be augmented by surrounding the NRS8040T101MJGK with ground guard traces on adjacent signal layers, further confining magnetic flux. High-frequency return paths should snake back to the inductor through the same ground reference to minimize loop inductance; sloppy return routing negates the NRS8040T101MJGK's shielding benefit. The input capacitor and switch node of a buck converter should be placed immediately adjacent to the NRS8040T101MJGK to keep switching currents localized. Although the NRS8040T101MJGK reduces radiated EMI compared to unshielded designs, layout discipline remains non-negotiable for FCC/CE compliance in sensitive applications.
What is the cost-to-performance tradeoff of the NRS8040T101MJGK versus standard larger inductors, and in what volume scenarios is it economical?
The NRS8040T101MJGK typically costs 15–30% more than a standard 1210 100µH inductor from commodity suppliers due to the custom drum core design and lower production volume. The premium is justified when PCB area savings directly reduce layer count, shrink overall board dimensions, or enable higher power density in space-constrained form factors. In single-unit or small-batch prototyping, the NRS8040T101MJGK's premium may be acceptable for design flexibility. However, at production volumes >10k units/month, the cost premium becomes significant; economies of scale on standard packages reduce the cost delta, making the NRS8040T101MJGK less compelling. For consumer chargers or IoT modules targeting 100k+ annual volume, alternative compact inductors with broader supplier support (Murata, TDK, Samsung) often achieve lower cost via higher-volume production. The NRS8040T101MJGK is most economical in niche applications where the compact footprint is essential and production volume is moderate (1k–10k units annually), or in designs where Taiyo Yuden has established a preferred supplier relationship.

Parts with Similar Specifications

The three parts on the right have similar specifications to Taiyo Yuden NRS8040T101MJGK

Product Attribute NRS8040T101MJGKV NRS8040T151MJGK NRS8040T100MJGJV NRS8040T100MJGJ
Part Number NRS8040T101MJGKV NRS8040T151MJGK NRS8040T100MJGJV NRS8040T100MJGJ
Manufacturer Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden
Size / Dimension - - - -
Material - Core - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Ratings - - - -
Features - - - Simultaneous Sampling
Q @ Freq - - - -
Inductance Frequency - Test - - - -
Shielding - - - -
Frequency - Self Resonant - - - -
Tolerance - - - -
Current Rating (Amps) - - - -
Height - Seated (Max) - - - -
Type - - - -
Inductance - - - -
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
DC Resistance (DCR) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Saturation (Isat) - - - -

NRS8040T101MJGK Datasheet PDF

Download NRS8040T101MJGK pdf datasheets and Taiyo Yuden documentation for NRS8040T101MJGK - Taiyo Yuden.

Datasheets
NRS8040T101MJGK 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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NRS8040T101MJGK Image

NRS8040T101MJGK

Taiyo Yuden
32D-NRS8040T101MJGK

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