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SPM3020T-4R7M-LR
TDK Corporation
FIXED IND 4.7UH 1.9A 174.5 MOHM
10361 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 1.9 A 174.5mOhm Max Nonstandard
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5.0 / 5.0
- (455 Ratings)
SPM3020T-4R7M-LR
Product Overview
6674024
DiGi Electronics Part Number
SPM3020T-4R7M-LR-DGManufacturer
TDK Corporation
SPM3020T-4R7M-LR
Description
FIXED IND 4.7UH 1.9A 174.5 MOHMInventory
10361 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 1.9 A 174.5mOhm Max Nonstandard
Quantity
Minimum 1
Minimum 1
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SPM3020T-4R7M-LR Technical Specifications
Category
Fixed Inductors
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SPM-LR
Product Status
Active
Type
Drum Core, Wirewound
Material - Core
Metal
Inductance
4.7 µH
Tolerance
±20%
Current Rating (Amps)
1.9 A
Current - Saturation (Isat)
2.9A
Shielding
Shielded
DC Resistance (DCR)
174.5mOhm Max
Q @ Freq
-
Frequency - Self Resonant
-
Ratings
-
Operating Temperature
-40°C ~ 125°C
Inductance Frequency - Test
100 kHz
Mounting Type
Surface Mount
Package / Case
Nonstandard
Size / Dimension
0.126" L x 0.118" W (3.20mm x 3.00mm)
Height - Seated (Max)
0.079" (2.00mm)
Datasheet & Documents
HTML Datasheet
SPM3020T-4R7M-LR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8504.50.4000
Additional Information
Other Names
445-174457-2
445-174457-1
445-174457-6
Standard Package
2,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Bei Problemen wurde mir sofort geholfen, was mein Vertrauen in den Service stärkt.
Dec 02, 2025
Their commitment to after-sales excellence is evident in every interaction I have with them.
Dec 02, 2025
I appreciate how their stocked items are always up-to-date and ready for shipment.
Dec 02, 2025
I found their customer service to be consistently reliable, offering quick and accurate assistance.
Dec 02, 2025
Their quick logistics and reliable support team made everything very smooth for me.
Dec 02, 2025
I highly recommend DiGi Electronics for their speedy delivery and excellent support.
Dec 02, 2025
Received my order faster than expected, with attentive and fast customer service.
Dec 02, 2025
The overall shopping experience was enjoyable due to the user-friendly website.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the SPM3020T-4R7M-LR inductor in a high-density DC-DC converter layout, and how can they be mitigated?
The SPM3020T-4R7M-LR’s compact 3.2 mm x 3.0 mm footprint and 2.0 mm height make it attractive for space-constrained designs, but its proximity to other magnetic components or sensitive analog circuits can introduce coupling noise due to its wirewound drum core construction. To mitigate this, maintain at least 2–3 mm clearance from other inductors or transformers, orient the inductor perpendicular to adjacent magnetic components to minimize flux interaction, and use ground planes or shielding cans if necessary. Additionally, verify thermal performance under full load since the 174.5 mΩ DCR generates heat that can affect nearby temperature-sensitive components in tightly packed layouts.
Can the SPM3020T-4R7M-LR safely replace a Würth WE-LQS 744040472 in a 5V-to-1.2V buck converter running at 2.25 MHz, and what trade-offs should I expect?
While both the SPM3020T-4R7M-LR (4.7 µH, 1.9 A) and Würth WE-LQS 744040472 (4.7 µH, 2.1 A) offer similar inductance and current ratings, direct replacement requires careful evaluation. The TDK part has a lower saturation current (2.9 A vs. ~3.5 A for the Würth) and higher DCR (174.5 mΩ vs. ~120 mΩ), which may lead to increased conduction losses and reduced efficiency at high loads. Also, the SPM3020T-4R7M-LR is tested at 100 kHz, not optimized for 2.25 MHz operation—its core losses could be significantly higher at this frequency. If replacing, validate thermal performance, efficiency, and output ripple under worst-case conditions; consider derating the load current by 10–15% to ensure reliability.
How does the SPM3020T-4R7M-LR perform under sustained overload conditions near its 1.9 A RMS current rating in an ambient temperature of 85°C?
Operating the SPM3020T-4R7M-LR continuously near its 1.9 A RMS rating at 85°C ambient significantly increases thermal stress due to I²R losses from its 174.5 mΩ DCR. At this temperature, the inductor’s effective current handling drops due to copper resistivity rise and potential core property shifts. TDK specifies a 125°C max operating temperature, but sustained operation near this limit accelerates insulation aging and reduces long-term reliability. For robust design, limit continuous RMS current to ≤1.5 A at 85°C ambient and ensure adequate airflow or thermal vias beneath the component. Monitor hotspot temperature during validation—exceeding 110°C surface temperature may warrant selecting a higher-current-rated alternative like the SPM3020T-6R8M-LR.
Is the SPM3020T-4R7M-LR suitable for automotive-grade power supplies requiring AEC-Q200 compliance, and what documentation should I request from TDK?
The SPM3020T-4R7M-LR is not explicitly rated for AEC-Q200 qualification, despite its wide -40°C to +125°C operating range. While it shares some environmental robustness with automotive-grade parts, lack of formal AEC-Q200 certification means it hasn’t undergone required stress tests like thermal shock, humidity bias, or mechanical shock/vibration per automotive standards. For automotive applications (e.g., infotainment, ADAS), avoid using this part unless TDK provides a specific AEC-Q200 compliance statement. Instead, consider TDK’s AEC-Q200 qualified alternatives like the CLF series. If you must use the SPM3020T-4R7M-LR in non-safety-critical automotive subsystems, obtain full reliability test data, MSL certification (it’s MSL 1), and RoHS3/REACH documentation to support your risk assessment.
What layout and PCB design considerations are critical when integrating the SPM3020T-4R7M-LR into a multi-phase buck regulator to avoid instability or EMI issues?
When using the SPM3020T-4R7M-LR in multi-phase buck regulators, improper layout can cause current imbalance, increased EMI, and control loop instability. Ensure symmetrical routing of power traces between phases to maintain equal inductance and resistance paths—asymmetric layouts exacerbate the part’s inherent ±20% inductance tolerance, leading to uneven current sharing. Place input/output capacitors as close as possible to the inductor and switching node to minimize high-di/dt loops. Avoid routing sensitive feedback traces under or adjacent to the inductor due to its unshielded magnetic fringe fields (despite being 'shielded,' drum cores still emit some flux). Use a solid ground plane beneath the inductor but avoid large copper pours directly under the component that could induce eddy currents. Finally, verify switching node ringing with an oscilloscope; the SPM3020T-4R7M-LR’s nonstandard package may interact parasitically with nearby traces, requiring snubber tuning.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
SPM3020T-4R7M-LR CAD Models
TDK Corporation SPM3020T-4R7M-LR PCB symbols & footprints
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