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Add : Room 701, Building A1, No. 55 Runfa Road, Jiangning District, Nanjing, China
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The 3521 Unshielded SMT Power Inductor is designed for compact electronic circuits requiring efficient energy storage, stable current handling capability, and reliable high-frequency operation. Its surface-mount structure enables space-saving PCB integration and supports automated SMT assembly processes.
Featuring an optimized unshielded magnetic design, this inductor provides efficient power conversion performance for modern DC-DC converter circuits and compact power management systems.
Compared with shielded inductors, the unshielded structure offers improved inductance flexibility and cost-effective integration for general-purpose electronic applications.
Customized inductance values, current ratings, and package specifications are available according to customer requirements.
Compact SMT surface-mount structure
Unshielded magnetic design
Stable high-frequency performance
Efficient energy storage capability
Suitable for DC-DC converter systems
Optimized for automated SMT assembly
Space-saving PCB integration
Flexible customization support
DC-DC Converter Circuits
Compact Switching Power Supplies
Portable Electronic Devices
Consumer Electronics
Embedded PCB Systems
Communication Modules
Power Management Applications
Physical Properties
Order Code | L (μH) | lR (A) | lRP,40K (A) | lSAT (A) | lSAT,10% (A) | lSAT,30% (A) | RDC max. (Ω) | fres (MHz) |
INF-3521-1μH | 1 | 2.55 | 3 | 3.7 | 3.7 | 4.3 | 0.05 | 160 |
INF-3521-1.5μH | 1.5 | 2.08 | 2.5 | 3.05 | 3.05 | 3.6 | 0.07 | 130 |
INF-3521-2.2μH | 2.2 | 1.71 | 2.2 | 2.54 | 2.54 | 3 | 0.09 | 100 |
INF-3521-3.3μH | 3.3 | 1.39 | 1.9 | 2.09 | 2.09 | 2.45 | 0.12 | 80 |
INF-3521-4.7μH | 4.7 | 1.16 | 1.6 | 1.77 | 1.77 | 2.1 | 0.16 | 70 |
INF-3521-6.8μH | 6.8 | 0.96 | 1.4 | 1.48 | 1.48 | 1.78 | 0.21 | 55 |
INF-3521-10μH | 10 | 0.8 | 1.15 | 1.23 | 1.23 | 1.45 | 0.3 | 45 |
INF-3521-15μH | 15 | 0.64 | 0.95 | 1.01 | 1.01 | 1.18 | 0.43 | 36 |
INF-3521-22μH | 22 | 0.53 | 0.7 | 0.84 | 0.84 | 0.97 | 0.7 | 28 |
INF-3521-33μH | 33 | 0.43 | 0.6 | 0.7 | 0.7 | 0.83 | 0.97 | 24 |
INF-3521-47μH | 47 | 0.36 | 0.5 | 0.59 | 0.59 | 0.69 | 1.33 | 20 |
INF-3521-68μH | 68 | 0.3 | 0.4 | 0.49 | 0.49 | 0.57 | 1.8 | 16 |
INF-3521-100μH | 100 | 0.24 | 0.3 | 0.41 | 0.41 | 0.47 | 2.8 | 12 |
Technical Specifications
| Main Category | Subcategory | Details |
| MOQ | Prototyping & Small-batch | 10 piece minimum order |
| Sample Service | Free proofing & custom service, 5 free samples (shipping at buyer’s cost) | |
| Bulk Order | 5,000 pieces and above with bulk pricing | |
| Lead Time | All Standard Components | Shipped within 5–7 working days |
| Custom Inductance / Pin Design (Sample) | Sample order confirmed within 5–7 working days | |
| Custom Inductance / Pin Design (Mass Order) | Shipped within 15–30 working days | |
| Payment Terms | Main Payment Term | T/T in advance, L/C at sight |
| Procurement Standard | Complies with global enterprise procurement standard for passive components | |
| Quality Deposit | No quality security deposit required | |
| Accepted Terms | FOB Shanghai / Nanjing / Hong Kong, T/T Advance | |
| Quality Assurance | Manufacturing Defects | Free replacement for issues caused by manufacturing defects |
| Inspection Report | Batch inspection reports available as certification upon customer request | |
| Packaging Specifications | Updated Packaging (2026) | Blister tray packaging; Sealed Tape & Reel for SMD products |
| Optional Packaging | Vacuum sealed packaging for customers with strict moisture-proof requirements |
