Counterfeit and defect prevention
Visual and packaging inspection
Electrical performance verification
Service Email:
[email protected]
>
SWPA4030S121MT
Shenzhen Sunlord Electronics Co., Ltd.
FIXED IND 120UH 420MA 1.755 OHM
6369 Pcs New Original In Stock
120 µH Shielded Drum Core, Wirewound Inductor 420 mA 1.755Ohm Max Nonstandard
Request Quote
(Ships tomorrow)
*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (347 Ratings)
SWPA4030S121MT
Product Overview
9881242
DiGi Electronics Part Number
SWPA4030S121MT-DGManufacturer
Shenzhen Sunlord Electronics Co., Ltd.
SWPA4030S121MT
Description
FIXED IND 120UH 420MA 1.755 OHMInventory
6369 Pcs New Original In Stock
120 µH Shielded Drum Core, Wirewound Inductor 420 mA 1.755Ohm Max Nonstandard
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
Shipping & Delivery
Quality Assurance
365 - Day Quality Guarantee - Every part fully backed.
90 - Day Refund or Exchange - Defective parts? No hassle.
Limited Stock, Order Now - Get reliable parts without worry.
Global Shipping & Secure Packaging
Worldwide Delivery in 3-5 Business Days
100% ESD Anti-Static Packaging
Real-Time Tracking for Every Order
Secure & Flexible Payment
Credit Card, VISA, MasterCard, PayPal, Western Union, Telegraphic Transfer(T/T) and more
All payments encrypted for security
SWPA4030S121MT Technical Specifications
Category
Fixed Inductors
Packaging
Tape & Reel (TR)
Series
SWPA
Product Status
Active
Type
Drum Core, Wirewound
Material - Core
Ferrite
Inductance
120 µH
Tolerance
±20%
Current Rating (Amps)
420 mA
Current - Saturation (Isat)
550mA
Shielding
Shielded
DC Resistance (DCR)
1.755Ohm Max
Q @ Freq
-
Frequency - Self Resonant
5.4MHz
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)
0.118" (3.00mm)
Datasheet & Documents
HTML Datasheet
SWPA4030S121MT-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8504.50.8000
Additional Information
Other Names
3442-SWPA4030S121MTTR
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
他們的包裝材料非常環保，沒有多餘的塑膠或浪費，很符合我支持永續發展的價值觀。
грудня 02, 2025
The durability and performance of their products are unmatched.
грудня 02, 2025
The tracking history provided by DiGi Electronics allows for precise delivery scheduling.
грудня 02, 2025
Their extensive product portfolios cater to a wide range of technical requirements.
Publish Evalution
Evalution Message
Please enter your review message.
Please post honest comments and do not post ilegal comments.
Frequently Asked Questions (FAQ)
Can the SWPA4030S121MT inductor be safely used in a high-current buck converter operating near its 420 mA RMS current limit without risking thermal runaway or core saturation?
While the SWPA4030S121MT is rated for 420 mA RMS and has a saturation current (Isat) of 550 mA, operating continuously near the RMS limit in a buck converter can lead to excessive temperature rise due to its 1.755 Ω DCR. Combined with switching harmonics and poor PCB thermal management, this may push the inductor beyond safe operating conditions. To mitigate risk, derate the current by at least 20%, ensure adequate copper pour for heat dissipation, and verify in-circuit temperature rise—especially above 85°C ambient. Consider alternatives like the Bourns SRP4030-121M (120 µH, 1.8 A Isat) if higher margin is needed.
Is the SWPA4030S121MT a suitable drop-in replacement for the TDK MLZ2012M121WT000 in a noise-sensitive analog power rail, given differences in shielding and core material?
The SWPA4030S121MT uses a shielded drum-core ferrite design, which offers good magnetic containment, but its wirewound construction may exhibit higher acoustic noise and EMI compared to the multilayer ceramic-core TDK MLZ2012M121WT000. While both are 120 µH inductors, the TDK part typically has lower parasitic capacitance and better high-frequency noise suppression. For noise-sensitive analog rails (e.g., ADC or RF supply), the SWPA4030S121MT may introduce unwanted emissions or vibration-induced noise. Evaluate with conducted/radiated EMI testing; if noise is critical, consider adding an LC filter stage or selecting a low-acoustic-noise alternative like the Murata LQH3NPN120NG0L.
What are the key reliability risks when using the SWPA4030S121MT in automotive under-hood applications with sustained temperatures above 105°C?
Although the SWPA4030S121MT is rated for operation up to 125°C, prolonged exposure above 105°C—common in under-hood environments—can accelerate insulation aging in the wirewound coil and degrade ferrite core performance over time. The MSL 1 rating eliminates moisture concerns, but thermal cycling may induce mechanical stress at solder joints due to CTE mismatch. For automotive use, validate long-term reliability through AEC-Q200 stress testing (e.g., thermal shock, high-temp storage). Consider inductors with explicit AEC-Q200 qualification like the Vishay IHLP-2525CZ-81 (120 µH, 1.1 A) for higher confidence in mission-critical systems.
How does the ±20% inductance tolerance of the SWPA4030S121MT affect loop stability in a voltage-mode controlled DC-DC converter, and what design adjustments are needed?
The ±20% tolerance on the SWPA4030S121MT means actual inductance could range from 96 µH to 144 µH, significantly impacting the control loop’s crossover frequency and phase margin in voltage-mode converters. This variability can lead to suboptimal transient response or even instability if compensation networks are tuned for nominal values. To address this, use adaptive compensation, implement soft-start with current limiting, or select tighter-tolerance inductors (±10% or better) if available. Alternatively, design the compensation network for worst-case inductance (highest value) to ensure stability across all units, accepting a slightly slower response in nominal cases.
Can the SWPA4030S121MT be used in a 500 kHz synchronous boost converter, given its 5.4 MHz self-resonant frequency and lack of specified Q factor?
Yes, the SWPA4030S121MT can operate in a 500 kHz boost converter since the switching frequency is well below its 5.4 MHz self-resonant frequency (SRF), minimizing parasitic resonance risks. However, the absence of a specified Q factor suggests limited high-frequency efficiency optimization. At 500 kHz, core and winding losses may be higher than optimized RF inductors, reducing overall converter efficiency. Verify actual losses via thermal imaging and efficiency measurements. For higher efficiency, consider gapped ferrite inductors with lower DCR and better high-frequency characterization, such as the Coilcraft XAL4030-123MEB (120 µH, 1.6 A, lower DCR), especially if >85% efficiency is required.
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.
SWPA4030S121MT CAD Models
Shenzhen Sunlord Electronics Co., Ltd. SWPA4030S121MT PCB symbols & footprints
productDetail
