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SWPA3012S3R9MT
Shenzhen Sunlord Electronics Co., Ltd.
FIXED IND 3.9UH 1.24A 189MOHM SM
2407 Pcs New Original In Stock
3.9 µH Shielded Drum Core, Wirewound Inductor 1.24 A 189mOhm Max Nonstandard
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5.0 / 5.0
- (19 Ratings)
SWPA3012S3R9MT
Product Overview
9880840
DiGi Electronics Part Number
SWPA3012S3R9MT-DGManufacturer
Shenzhen Sunlord Electronics Co., Ltd.
SWPA3012S3R9MT
Description
FIXED IND 3.9UH 1.24A 189MOHM SMInventory
2407 Pcs New Original In Stock
3.9 µH Shielded Drum Core, Wirewound Inductor 1.24 A 189mOhm Max Nonstandard
Quantity
Minimum 1
Minimum 1
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SWPA3012S3R9MT Technical Specifications
Category
Fixed Inductors
Packaging
Tape & Reel (TR)
Series
SWPA
Product Status
Active
Type
Drum Core, Wirewound
Material - Core
Ferrite
Inductance
3.9 µH
Tolerance
±20%
Current Rating (Amps)
1.24 A
Current - Saturation (Isat)
1A
Shielding
Shielded
DC Resistance (DCR)
189mOhm Max
Q @ Freq
-
Frequency - Self Resonant
61MHz
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
0.118" L x 0.118" W (3.00mm x 3.00mm)
Height - Seated (Max)
0.047" (1.20mm)
Datasheet & Documents
HTML Datasheet
SWPA3012S3R9MT-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8504.50.8000
Additional Information
Other Names
3442-SWPA3012S3R9MTTR
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
価格の魅力と物流の良さで何度もリピートしています。
Dec 02, 2025
価格の安さとサポートの質の高さに感激しています。
Dec 02, 2025
Thanks to DiGi Electronics' user-centric website design and great prices, shopping is hassle-free.
Dec 02, 2025
The packaging design is simple yet functional, making the unboxing process smooth.
Dec 02, 2025
Simply love their commitment to sustainability and budget-friendly options.
Dec 02, 2025
Their quick turnaround on support requests means my issues are resolved without lengthy downtimes.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the SWPA3012S3R9MT in a high-frequency DC-DC converter operating above 2MHz?
When integrating the SWPA3012S3R9MT into a DC-DC converter above 2MHz, the primary risk is approaching its self-resonant frequency (SRF) of 61MHz, which can cause inductive-to-capacitive behavior and instability. Operating above 10MHz significantly reduces effective impedance, degrading filtering performance. To mitigate, ensure switching frequency remains below 1/3 of SRF (~20MHz) and validate impedance characteristics under actual load current with network analyzer or SPICE models. Also consider core losses at high frequencies due to ferrite material non-idealities, even within rated temperature range.
How does the SWPA3012S3R9MT compare to the Murata LQH3N3R9MC0 in terms of saturation current and board space for point-of-load regulator designs?
The SWPA3012S3R9MT and Murata LQH3N3R9MC0 both offer 3.9µH inductance and similar 3.0mm x 3.0mm footprints, but differ in saturation performance: the SWPA3012S3R9MT specifies Isat = 1A (vs. Murata’s 1.1A), making the latter slightly more robust for transient load steps in POL applications. However, the SWPA3012S3R9MT has lower DCR (189mΩ max vs. 210mΩ), improving efficiency under steady load. Choose SWPA3012S3R9MT for efficiency-focused designs with controlled peak currents; consider the Murata alternative if tighter saturation margin is needed despite higher resistive loss.
Can the SWPA3012S3R9MT be safely used in automotive under-hood applications with ambient temperatures reaching 125°C, and what derating should be applied?
Yes, the SWPA3012S3R9MT is rated for operation up to 125°C, making it suitable for automotive under-hood use, but thermal and current derating are critical. At maximum ambient temperature, ambient-convection cooling is limited; expect internal temperature rise beyond 125°C under full 1.24A RMS due to I²R losses (up to 290mW). Derate RMS current by at least 30% at 125°C ambient and ensure PCB copper layout provides adequate thermal relief (e.g., thermal vias under pad). Monitor hotspot temperature with IR camera during validation to prevent long-term reliability degradation of the ferrite core or solder joints.
What are the failure risks if the SWPA3012S3R9MT is used in a circuit where momentary current spikes reach 1.1A in a power supply design?
Using the SWPA3012S3R9MT with current spikes up to 1.1A introduces saturation risk, as its Isat is defined at 1A (7–8% inductance drop). Brief excursions above 1A may be acceptable, but repeated or sustained overcurrent causes partial core saturation, increasing peak current ripple and switching losses in the MOSFETs. This can lead to thermal runaway or voltage instability. To mitigate, simulate transient response with actual inductor saturation model, add a small holdup capacitor to reduce di/dt stress, or select a higher-saturation alternative like the TDK VLS-201611ET-3R9M (Isat = 1.4A) if spikes are frequent. Monitor inductor temperature and converter efficiency during burn-in testing.
Is the SWPA3012S3R9MT a valid drop-in replacement for the Coilcraft XAL3015-3R9M in compact buck converters, and what layout considerations are needed?
The SWPA3012S3R9MT can replace the Coilcraft XAL3015-3R9M in many buck converters, but with key mechanical and electrical differences: the SWPA3012S3R9MT is 3.0mm x 3.0mm vs. XAL3015’s 3.0mm x 3.0mm footprint but with a lower seated height (1.20mm max vs. 1.5mm), allowing tighter clearances. Electrically, the XAL3015-3R9M has higher Isat (1.45A) and lower DCR (175mΩ), offering better surge tolerance. When replacing, verify PCB land pattern compatibility—Sunlord’s nonstandard package may differ in pad dimensions. Redesign the footprint if necessary, maintain ground plane continuity under the inductor (shielded type allows this), and revalidate loop stability and thermal performance due to different thermal and magnetic characteristics.
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SWPA3012S3R9MT CAD Models
Shenzhen Sunlord Electronics Co., Ltd. SWPA3012S3R9MT PCB symbols & footprints
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