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SWPA4018S4R7MT
Shenzhen Sunlord Electronics Co., Ltd.
FIXED IND 4.7UH 1.2A 117MOHM SMD
66621 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 1.2 A 117mOhm Max Nonstandard
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5.0 / 5.0
- (305 Ratings)
SWPA4018S4R7MT
Product Overview
9877417
DiGi Electronics Part Number
SWPA4018S4R7MT-DGManufacturer
Shenzhen Sunlord Electronics Co., Ltd.
SWPA4018S4R7MT
Description
FIXED IND 4.7UH 1.2A 117MOHM SMDInventory
66621 Pcs New Original In Stock
4.7 µH Shielded Drum Core, Wirewound Inductor 1.2 A 117mOhm Max Nonstandard
Quantity
Minimum 1
Minimum 1
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SWPA4018S4R7MT 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
±20%
Current Rating (Amps)
1.2 A
Current - Saturation (Isat)
2.2A
Shielding
Shielded
DC Resistance (DCR)
117mOhm Max
Q @ Freq
-
Frequency - Self Resonant
34MHz
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
0.157" L x 0.157" W (4.00mm x 4.00mm)
Height - Seated (Max)
0.071" (1.80mm)
Datasheet & Documents
HTML Datasheet
SWPA4018S4R7MT-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8504.50.8000
Additional Information
Other Names
3442-SWPA4018S4R7MTTR
3442-SWPA4018S4R7MTDKR
3442-SWPA4018S4R7MTCT
Standard Package
3,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Their commitment to product consistency makes shopping with DiGi Electronics a hassle-free experience.
Dec 02, 2025
DiGi Electronics’s logistics updates are timely and accurate, helping me plan better.
Dec 02, 2025
Their logistical coordination is flawless, ensuring products arrive exactly when needed.
Dec 02, 2025
Their customer support team is very knowledgeable and helped me troubleshoot effectively after purchase.
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Frequently Asked Questions (FAQ)
Can the SWPA4018S4R7MT handle high current transients in a DC-DC buck converter without significant saturation risk, and how does its Isat of 2.2A impact design margin in automotive applications?
Yes, the SWPA4018S4R7MT has a saturation current (Isat) of 2.2A, which provides a safe margin above its 1.2A rated current, making it suitable for transient-intensive environments like automotive power supplies. In a buck converter with peak transient currents approaching 2A, this inductor limits inductance drop to less than 30%, preserving loop stability. To mitigate saturation risks, ensure peak inductor current (including ripple) stays below 2.2A. For designs near this limit, monitor core temperature and consider PCB copper area for thermal relief, as ferrite cores can exhibit thermal runaway under combined electrical and thermal stress in harsh environments like engine control units (ECUs).
What are the thermal performance trade-offs when using the SWPA4018S4R7MT in a high-density power stage running at 2MHz switching frequency?
While the SWPA4018S4R7MT has a low DCR of 117mΩ max, enabling efficient conduction at lower frequencies, its self-resonant frequency (SRF) of 34MHz limits effectiveness above ~5MHz, but 2MHz operation is still feasible with caution. However, at 2MHz, core losses in ferrite increase significantly due to hysteresis and eddy currents, even with shielding. At full 1.2A DC load, temperature rise may exceed 40°C in confined layouts. To mitigate thermal risks: use 2oz copper pour for heatsinking, avoid placing near other heat sources, and verify derating curves in real-world conditions. Consider comparing with higher SRF alternatives like the TDK SLF4528T-4R7N if efficiency drops become unacceptable at high frequency.
How reliable is the SWPA4018S4R7MT in long-term industrial applications exposed to thermal cycling between -40°C and 125°C, and what PCB layout practices prevent mechanical cracking?
The SWPA4018S4R7MT is rated for -40°C to 125°C with a ferrite drum core and fully encapsulated construction, supporting industrial reliability. However, thermal cycling can induce mechanical stress due to CTE mismatch between PCB and ceramic body. To prevent cracking, avoid placing the inductor near board edges or corners, use symmetrical pad designs per IPC-7351, and implement dog-bone thermal relief for the center pad (if applicable). Ensure reflow profiles follow JEDEC standards with controlled ramp rates (<3°C/sec) to prevent delamination. The MSL-1 rating simplifies storage but does not eliminate solder joint fatigue risks under sustained thermal cycling in motor drives or industrial PLCs.
Is the SWPA4018S4R7MT a viable drop-in replacement for the Murata LQM2HP4R7MG0L in a space-constrained 5V-to-1.2V point-of-load converter, and what design checks are needed?
The SWPA4018S4R7MT and Murata LQM2HP4R7MG0L both offer 4.7µH and ~1.2A ratings, but are not direct pin-to-pin replacements. The Sunlord device measures 4.0mm x 4.0mm vs. Murata’s 2.0mm x 1.6mm, requiring significant layout changes. Before substitution, confirm that the larger footprint doesn’t interfere with surrounding components or thermal vias. Additionally, verify EMI performance: the shielded drum construction of SWPA4018S4R7MT offers better magnetic confinement than some comparable Murata thin-film types, but higher profile (1.8mm) may violate mechanical stack-up limits. Update thermal simulations and inductor current ripple calculations to reflect altered DCR and core loss characteristics.
How does the 117mOhm max DCR of the SWPA4018S4R7MT affect efficiency in battery-powered IoT devices, and what alternatives should be considered if lower losses are needed?
With a maximum DCR of 117mΩ, the SWPA4018S4R7MT contributes up to 0.168W loss at 1.2A (I²R), which can significantly impact efficiency in low-power IoT applications where every mW counts. For example, in a 3.7V to 1.8V buck converter at 1A load, conduction loss alone reduces efficiency by ~3–5%. To improve battery life, consider lower-DCR alternatives like the Taiyo Yuden MHR4018-4R7N (DCR ~85mΩ, 4.7µH, 1.5A) in the same 4x4mm footprint, or optimize switching frequency to balance core and copper losses. If size allows, stepping up to a 5x5mm inductor often provides better efficiency trade-offs. Always validate losses with load-step transient testing under real battery discharge conditions.
Quality Assurance (QC)
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SWPA4018S4R7MT CAD Models
Shenzhen Sunlord Electronics Co., Ltd. SWPA4018S4R7MT PCB symbols & footprints
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