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HomeProductsInductors, Coils, ChokesFixed InductorsLQM21PN3R3NG0D
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LQM21PN3R3NG0D - Murata Electronics

Manufacturer Part Number
LQM21PN3R3NG0D
Manufacturer
Murata Electronics
Allelco Part Number
32D-LQM21PN3R3NG0D
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
474,700 pcs available, New & Original
Parts Description
FIXED IND 3.3UH 800MA 207MOHM SM
Package
0805 (2012 Metric)
Data sheet
LQM21PN3R3NG0D.pdf
RoHs Status
ROHS3 Compliant
Our certification
In stock: 474700

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Specifications

LQM21PN3R3NG0D Tech Specifications
Murata Electronics - LQM21PN3R3NG0D technical specifications, attributes, parameters and parts with similar specifications to Murata Electronics - LQM21PN3R3NG0D

Product Attribute Attribute Value
Manufacturer Murata Electronics
Type Multilayer
Tolerance ±30%
Supplier Device Package 0805 (2012 Metric)
Size / Dimension 0.079' L x 0.049' W (2.00mm x 1.25mm)
Shielding Shielded
Series LQM21
Ratings -
Q @ Freq -
Package / Case 0805 (2012 Metric)
Package Tape & Reel (TR)
Product Attribute Attribute Value
Operating Temperature -55°C ~ 125°C
Mounting Type Surface Mount
Material - Core Ferrite
Inductance Frequency - Test 1 MHz
Inductance 3.3 µH
Height - Seated (Max) 0.039' (1.00mm)
Frequency - Self Resonant 30MHz
DC Resistance (DCR) 207mOhm Max
Current Rating (Amps) 800 mA
Current - Saturation (Isat) -
Base Product Number LQM21PN

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 current handling limits of the LQM21PN3R3NG0D inductor in switching power supply designs?
The LQM21PN3R3NG0D is rated for 800 mA continuous current, which establishes the upper boundary for steady-state load delivery in boost, buck, or buck-boost topologies. At this rating, the DC resistance of 207 mOhm generates approximately 132 mW of resistive loss, a factor that becomes significant in battery-powered or efficiency-critical applications where thermal budget is limited. Designers should verify that peak transient currents during switching transitions remain within component limits, as the LQM21PN3R3NG0D does not specify a separate saturation current rating. For applications approaching the 800 mA ceiling, thermal simulation or empirical measurement is recommended to confirm junction temperature stays within the -55°C to 125°C operating range.
How does the 207 mOhm DCR of the LQM21PN3R3NG0D affect efficiency in low-voltage buck converter circuits?
In a 5V input, 3.3V output buck converter delivering 500 mA, the LQM21PN3R3NG0D inductor alone dissipates approximately 52 mW due to its 207 mOhm resistance. This represents roughly 2–3% of total converter losses in designs with modern MOSFETs and low-loss diodes, but becomes the dominant loss source when gate drive and switching losses are minimized. At higher current levels, resistive loss scales with the square of current; at 800 mA, dissipation reaches 132 mW. The 3.3 µH inductance value also influences ripple current and switching frequency trade-offs: lower inductance increases ripple, raising RMS current and winding losses. Designers balancing PCB area constraints (which favor smaller inductance) against efficiency targets should account for the LQM21PN3R3NG0D's DCR as a non-negotiable thermal and efficiency contributor.
Can the LQM21PN3R3NG0D be used in RF or high-frequency filtering applications given its 30 MHz self-resonant frequency?
The LQM21PN3R3NG0D's 30 MHz self-resonant frequency (SRF) marks the transition point where inductive and parasitic capacitive behavior balance. Above this frequency, the component behaves increasingly capacitive rather than inductive, making it unsuitable for primary RF inductance roles in antenna matching or transmission line applications. However, the LQM21PN3R3NG0D remains effective for power supply decoupling networks or EMI filtering when operating well below its SRF—typically in the sub-10 MHz range. In mixed-signal designs, the LQM21PN3R3NG0D can suppress high-frequency noise on digital rails when paired with capacitors; the combination creates a low-impedance path at frequencies where the inductor's reactance is still positive. Designers should measure or simulate the impedance profile of the LQM21PN3R3NG0D in the target frequency band rather than relying on DC inductance values alone.
How does the ±30% inductance tolerance of the LQM21PN3R3NG0D impact loop stability in feedback-regulated converter designs?
The ±30% tolerance on the LQM21PN3R3NG0D means the actual inductance could range from 2.31 µH to 4.29 µH across a production batch. In a voltage-mode buck converter, this tolerance directly affects the output filter corner frequency and phase margin; a 30% variation in inductance shifts the LC resonant frequency by approximately ±15%, potentially destabilizing feedback loops designed for nominal 3.3 µH operation. Designers using the LQM21PN3R3NG0D should either select tighter-tolerance variants (if available from inventory), implement adaptive compensation in the feedback loop, or use conservative phase margin targets (>45°) that tolerate the inductance spread without instability. Current-mode control topologies are more robust to inductance variation than voltage-mode designs, since the LQM21PN3R3NG0D's inductor current is directly sensed and regulated. For precision applications, measuring inductance on sample parts before finalizing loop compensation is a practical validation step.
What is the thermal and reliability impact of operating the LQM21PN3R3NG0D continuously at 800 mA in a 125°C ambient environment?
At the upper temperature limit (125°C ambient) and rated current (800 mA), the LQM21PN3R3NG0D experiences combined thermal stress from resistive self-heating and external environment. With 207 mOhm DCR, the component self-generates 132 mW at 800 mA; on a small 0805 (2.00mm × 1.25mm) package with limited thermal mass, junction temperature will rise significantly above the ambient baseline. While Murata does not specify a maximum junction temperature for the LQM21PN3R3NG0D, ferrite-core inductors typically exhibit stable performance up to 130–150°C before core permeability degrades. Operating the LQM21PN3R3NG0D continuously at rated current and maximum ambient temperature pushes reliability margins and may require derated current, thermal interface optimization (e.g., copper planes, thermal vias), or forced convection cooling. For harsh environment applications, reducing the LQM21PN3R3NG0D operating current to 600–700 mA or confirming thermal modeling with the vendor is advisable.
How does the LQM21PN3R3NG0D shielding design reduce EMI coupling compared to unshielded inductors in mixed-signal PCBs?
The LQM21PN3R3NG0D's shielded multilayer construction incorporates ferrite layers that contain magnetic flux within and around the core geometry, significantly reducing field coupling to nearby sensitive circuits. An unshielded inductor radiates magnetic fields broadly into the PCB volume; in mixed-signal layouts with analog-to-digital converters or low-noise amplifiers positioned nearby, unshielded inductors are a common EMI culprit. The LQM21PN3R3NG0D's ferrite shielding typically reduces external field strength by 15–25 dB compared to air-core or partially shielded designs, measured at distances of 5–10 mm. This benefit is particularly valuable in compact 0805 layouts where component density is high and routing flexibility is low. However, shielding introduces additional ferrite material and parasitic capacitance, raising the self-resonant frequency slightly and increasing DCR slightly; the LQM21PN3R3NG0D's 207 mOhm resistance and 30 MHz SRF reflect these design trade-offs. For critical EMI applications, placement of the LQM21PN3R3NG0D away from sensitive signal paths (>10 mm separation) combined with ground plane continuity maximizes shielding effectiveness.
What is the practical frequency limit for using the LQM21PN3R3NG0D in synchronous buck converter pulse-width modulation (PWM) circuits?
The LQM21PN3R3NG0D's 30 MHz self-resonant frequency and 207 mOhm DCR establish practical boundaries for PWM switching frequency selection. In synchronous buck designs, the LQM21PN3R3NG0D is optimally used at PWM frequencies between 500 kHz and 3 MHz, where inductive reactance (proportional to L×f) provides sufficient impedance to limit ripple current while remaining well below the SRF. At 1 MHz (a common design point), the 3.3 µH inductance presents approximately 20.7 Ω of impedance, setting ripple current magnitude. Above 5 MHz switching frequency, the LQM21PN3R3NG0D becomes less effective as primary output filtering; its reactive behavior transitions toward capacitive, and high-frequency ripple attenuation degrades. Additionally, at very high switching frequencies (>10 MHz), core losses in the LQM21PN3R3NG0D increase nonlinearly, raising both heating and Q-factor degradation. Designers targeting ultra-high-frequency buck converters (10+ MHz) should consider smaller inductance values or alternative component families with lower parasitic capacitance.
How does the LQM21PN3R3NG0D moisture sensitivity level (MSL 1) affect storage, handling, and assembly processes?
The LQM21PN3R3NG0D carries an MSL 1 (Unlimited) moisture sensitivity rating, which is the most benign classification. MSL 1 components can be stored at any humidity level indefinitely without requiring desiccant packing or bake-out procedures before soldering. This eliminates common manufacturing pain points associated with higher MSL levels (3, 4, or 5), where exceeded storage windows or humidity exposure require expensive oven conditioning to prevent solder joint defects. For high-volume production, the LQM21PN3R3NG0D's MSL 1 status reduces supply chain complexity, storage infrastructure cost, and first-pass yield risk. However, standard PCB assembly handling practices (avoiding condensation on components, maintaining clean reflow soldering conditions) should still be followed. The LQM21PN3R3NG0D can be reworked or reflowed multiple times without moisture-induced failure risk, making it suitable for prototyping, NRE rework, or repair scenarios where component re-soldering is necessary.
What are the size and height constraints when integrating the LQM21PN3R3NG0D into compact or high-density PCB designs?
The LQM21PN3R3NG0D's 0805 (2012 Metric) package measures 2.00 mm length, 1.25 mm width, and 1.00 mm maximum seated height, making it a mid-size surface-mount inductor. In space-constrained applications (wearables, USB-C adapter modules, or multi-rail converters), this footprint is substantially larger than 0402 inductors but significantly smaller than 1210 components. The 1.00 mm height of the LQM21PN3R3NG0D is critical for applications with height budgets <2 mm; it permits single-layer inductor placement without creating assembly clearance violations. For high-density designs, the LQM21PN3R3NG0D can be placed on both sides of a PCB, though thermal and EMI considerations may favor one-sided placement. The 3.3 µH inductance in an 0805 package represents a practical balance between board area savings and available inductance; moving to smaller packages (0603) typically limits available inductance to <2.2 µH, while larger packages (1210) add volume without proportional inductance gain. PCB layout tools should account for the LQM21PN3R3NG0D's 2.00 mm length and 1.00 mm height when designing traces, vias, and routing near adjacent passives.
How does the LQM21PN3R3NG0D compare to ceramic chip inductors in terms of DCR, temperature stability, and cost trade-offs?
The LQM21PN3R3NG0D is a ferrite multilayer inductor, fundamentally different from ceramic chip inductors (which use ceramic core material). Ferrite designs like the LQM21PN3R3NG0D typically exhibit lower DCR (207 mOhm is favorable) and more stable inductance over temperature compared to ceramic alternatives, particularly above 50°C. A ceramic 3.3 µH inductor in 0805 size often exhibits 250–350 mOhm DCR and ±10–20% temperature coefficients, making the LQM21PN3R3NG0D more efficient in steady-state power applications. However, ceramic inductors occupy less volume for the same inductance and may offer lower cost in high-volume contexts. The LQM21PN3R3NG0D's shielding also provides superior EMI performance versus unshielded ceramic designs. For low-current filtering (≤200 mA), ceramic inductors suffice; for the LQM21PN3R3NG0D's 800 mA rating and efficiency-critical buck converters, the ferrite construction's lower resistive losses and stability justify the potential cost premium. Designers should compare thermal behavior: the LQM21PN3R3NG0D's inductance drift over -55°C to 125°C is typically ±10–15%, while ceramic inductors may drift ±20–30%, affecting loop stability in wide-temperature environments.
What inductance measurement frequency should be used when characterizing the LQM21PN3R3NG0D in design validation testing?
Murata specifies the LQM21PN3R3NG0D's 3.3 µH inductance at 1 MHz test frequency, a standard benchmark for power supply inductor datasheets. However, inductance is frequency-dependent; below 1 MHz, the LQM21PN3R3NG0D exhibits slightly higher inductance (typically +3–8%), and above 1 MHz (approaching its 30 MHz SRF), inductance gradually decreases. When validating the LQM21PN3R3NG0D in a circuit operating at a different switching frequency (e.g., 500 kHz), designers should either measure inductance at the actual operating frequency using an impedance analyzer, or apply a frequency-dependent correction factor empirically derived from component data. Most design simulation tools (SPICE, LTspice) assume inductance is constant; directly using the 1 MHz datasheet value of the LQM21PN3R3NG0D in 500 kHz converter simulations will slightly overestimate ripple current magnitude. For precision loop compensation design, measuring the LQM21PN3R3NG0D's impedance profile from 100 kHz to 10 MHz provides a complete picture of its reactive behavior across typical industrial switching frequencies.
Can the LQM21PN3R3NG0D be paralleled with other inductors to increase current capacity or reduce effective DCR in high-current designs?
Paralleling multiple LQM21PN3R3NG0D inductors is theoretically possible to reduce effective DCR (resistances combine in parallel) and share current, but introduces practical challenges. Two LQM21PN3R3NG0D inductors in parallel would present approximately 1.65 µH inductance (inductances add reciprocally) and ~103.5 mOhm effective DCR, enabling ~1.6 A current delivery with reduced loss. However, component tolerances become problematic: the ±30% inductance spread on each LQM21PN3R3NG0D means individual components could vary from 2.31 µH to 4.29 µH, causing unequal current division and thermal imbalance between paralleled units. Thermal coupling between closely spaced parallel inductors further complicates design. In practice, paralleling the LQM21PN3R3NG0D is rarely done; designers instead specify larger inductors (e.g., 1210 package) or select purpose-designed high-current families. If paralleling is necessary, matching inductance within tight tolerances and implementing separate current-sensing resistors per branch improves performance.
What is the RoHS 3 and REACH compliance scope of the LQM21PN3R3NG0D, and does it affect supplier selection or long-term availability?
The LQM21PN3R3NG0D is RoHS 3 compliant and REACH unaffected, meaning it contains no restricted hazardous substances (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers) beyond EU thresholds, and does not trigger REACH registration requirements. This compliance status ensures the LQM21PN3R3NG0D can be freely imported, distributed, and used in EU markets and exported to regions with equivalent standards (China RoHS, Japan green procurement). The LQM21PN3R3NG0D is also classified as EAR99 (Export Administration Regulations), permitting unrestricted export from the United States except to embargoed nations. From a long-term design perspective, RoHS 3 and REACH compliance signal that the LQM21PN3R3NG0D is manufactured under sustainable, regulated processes with lower risk of supply disruption due to environmental legislation changes. For medical, automotive, or aerospace applications requiring supply chain traceability, the LQM21PN3R3NG0D's compliance certifications provide confidence in continued availability and design-in legitimacy.

Parts with Similar Specifications

The three parts on the right have similar specifications to Murata Electronics LQM21PN3R3NG0D

Product Attribute LQM21PN3R3NGRD LQM21PN3R3MG0D LQM21PN3R3MGRD LQM21PN2R2NGCD
Part Number LQM21PN3R3NGRD LQM21PN3R3MG0D LQM21PN3R3MGRD LQM21PN2R2NGCD
Manufacturer Murata Electronics Murata Electronics Murata Electronics Murata Electronics
Q @ Freq - - - -
Material - Core - - - -
DC Resistance (DCR) - - - -
Inductance - - - -
Shielding - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Current Rating (Amps) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Saturation (Isat) - - - -
Height - Seated (Max) - - - -
Inductance Frequency - Test - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Size / Dimension - - - -
Type - - - -
Frequency - Self Resonant - - - -
Tolerance - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Ratings - - - -

LQM21PN3R3NG0D Datasheet PDF

Download LQM21PN3R3NG0D pdf datasheets and Murata Electronics documentation for LQM21PN3R3NG0D - Murata Electronics.

HTML Datasheet
LQ Part Numbering, Pwr Lines.pdf LQM21PNyyyyG0D Spec.pdf Standard Land Pattern Dimensions.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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LQM21PN3R3NG0D Image

LQM21PN3R3NG0D

Murata Electronics
32D-LQM21PN3R3NG0D

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