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SWPA5040S4R7NT
Shenzhen Sunlord Electronics Co., Ltd.
FIXED IND 4.7UH 3A 39 MOHM SMD
1742 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 3 A 39mOhm Max Nonstandard
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Minimum 1
5.0 / 5.0
- (400 Ratings)
SWPA5040S4R7NT
Product Overview
9877080
DiGi Electronics Part Number
SWPA5040S4R7NT-DGManufacturer
Shenzhen Sunlord Electronics Co., Ltd.
SWPA5040S4R7NT
Description
FIXED IND 4.7UH 3A 39 MOHM SMDInventory
1742 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 3 A 39mOhm Max Nonstandard
Quantity
Minimum 1
Minimum 1
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SWPA5040S4R7NT Technical Specifications
Category
Fixed Inductors
Packaging
Tape & Reel (TR)
Series
SWPA
Product Status
Active
Type
Drum Core, Wirewound
Material - Core
Ferrite
Inductance
4.7 µH
Tolerance
±30%
Current Rating (Amps)
3 A
Current - Saturation (Isat)
3.9A
Shielding
Shielded
DC Resistance (DCR)
39mOhm Max
Q @ Freq
-
Frequency - Self Resonant
28MHz
Ratings
-
Operating Temperature
-40°C ~ 125°C
Inductance Frequency - Test
100 kHz
Features
-
Mounting Type
Surface Mount
Package / Case
Nonstandard
Supplier Device Package
-
Size / Dimension
0.197" L x 0.197" W (5.00mm x 5.00mm)
Height - Seated (Max)
0.157" (4.00mm)
Datasheet & Documents
HTML Datasheet
SWPA5040S4R7NT-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8504.50.8000
Additional Information
Other Names
3442-SWPA5040S4R7NTTR
3442-SWPA5040S4R7NTCT
3442-SWPA5040S4R7NTDKR
Standard Package
1,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Die Reaktionszeiten bei Serviceanfragen sind vorbildlich. Die Produkte begeistern durch ihre Langlebigkeit.
Dec 02, 2025
配送前のパッキングはいつも丁寧で、細部まで気を配っています。
Dec 02, 2025
商品情報の提供も詳細で、安心して購入できました。
Dec 02, 2025
Their dependable products prove that quality doesn't have to be expensive.
Dec 02, 2025
Their products are dependable, and their service team consistently offers prompt solutions.
Dec 02, 2025
Affordable pricing and eco-friendly packaging make DiGi Electronics a top choice for eco-aware shoppers.
Dec 02, 2025
Customer satisfaction from after-sales service is a core value at DiGi.
Dec 02, 2025
I received my order sooner than I anticipated, thanks to their prompt shipping services.
Dec 02, 2025
Speedy delivery and attentive support made for a pleasant shopping experience.
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Frequently Asked Questions (FAQ)
Can the SWPA5040S4R7NT inductor handle continuous operation at 3 A in a high-density DC-DC converter layout without thermal derating, and what PCB design practices minimize hotspot formation?
The SWPA5040S4R7NT is rated for 3 A RMS current, but sustained operation at this level—especially in compact, high-power-density designs—can lead to localized heating due to its 39 mΩ DCR. In practice, thermal derating above 85°C ambient is recommended. To mitigate hotspots, use multiple vias under the component to conduct heat to inner or bottom copper layers, increase surrounding copper pour area, and avoid placing thermally sensitive components nearby. Monitor surface temperature with IR imaging during prototype testing to validate thermal performance.
What are the risks of replacing the SWPA5040S4R7NT with a lower-cost unshielded inductor like the Bourns SRN6045TA-4R7Y in a noise-sensitive buck converter application?
Replacing the shielded SWPA5040S4R7NT with an unshielded alternative such as the Bourns SRN6045TA-4R7Y introduces significant EMI risks. The SWPA5040S4R7NT’s drum-core ferrite shielding contains magnetic flux, reducing near-field coupling to adjacent circuits—critical in compact SMPS layouts. The SRN6045TA-4R7Y, while mechanically similar, lacks shielding and may radiate enough noise to disrupt analog sensors or RF sections within 5 mm. If cost-driven substitution is unavoidable, increase spacing, add ground guard rings, or use localized shielding cans, but expect degraded EMI performance and potential compliance test failures.
How does the ±30% inductance tolerance of the SWPA5040S4R7NT impact control loop stability in a voltage-mode buck converter, and should compensation networks be adjusted?
The SWPA5040S4R7NT’s ±30% tolerance means inductance can range from 3.29 µH to 6.11 µH, directly affecting the converter’s LC resonant frequency and phase margin. In voltage-mode control, this variation can shift crossover frequencies by over 30%, potentially causing instability or excessive overshoot during load transients. Designers should either select inductors with tighter tolerance (if available) or implement robust compensation that accommodates worst-case inductance extremes. Simulation across min/max L values and validation with margining tests (e.g., step-load response) are essential to ensure stability across all units.
Is the SWPA5040S4R7NT suitable for automotive applications requiring AEC-Q200 qualification, and what reliability concerns arise from its nonstandard package and MSL 1 rating?
The SWPA5040S4R7NT is not AEC-Q200 qualified, making it unsuitable for direct use in automotive power systems (e.g., infotainment, ADAS) without extensive customer-specific validation. While its MSL 1 rating indicates unlimited floor life and robust moisture resistance—beneficial for high-humidity environments—the nonstandard 5.00 mm × 5.00 mm footprint may complicate automated assembly and limit second-source options. For mission-critical automotive designs, consider qualified alternatives like the TDK VLS5040EX-4R7N or Murata DLW5BTM4R7SQ2. If used in non-safety automotive sub-systems, perform extended thermal cycling and vibration testing to assess long-term reliability.
When paralleling two SWPA5040S4R7NT inductors to increase current handling in a multiphase converter, what layout and matching considerations are critical to avoid current imbalance?
Paralleling SWPA5040S4R7NT inductors to achieve >3 A current is risky due to potential mismatch in DCR (±10–15% typical) and inductance (±30%), which can cause uneven current sharing and localized overheating. Even with identical parts, asymmetrical PCB trace lengths or unequal thermal coupling will exacerbate imbalance. If parallel operation is necessary, use a common input/output node with symmetric, low-impedance routing, place both inductors on the same thermal plane, and consider adding small balancing resistors (0.5–2 mΩ) in series. However, a single higher-current shielded inductor (e.g., SWPA6050S6R8MT) is strongly preferred for reliability and simplicity.
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.
SWPA5040S4R7NT CAD Models
Shenzhen Sunlord Electronics Co., Ltd. SWPA5040S4R7NT PCB symbols & footprints
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