SDR0403-221KL Bourns Inductor (Other) In Stock
Bourns SDR0403-221KL is a 220 µH ferrite-core power inductor in a 1816 case size with a 4.4 Ω DC resistance, designed for general-purpose power filtering and energy storage. Its rectangular SMT construction suits compact switching converter designs. RoHS-compliant and available in stock worldwide.
- Manufacturer
- Bourns
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SDR0403-221KL Datasheet PDF
- Category
- Inductor
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 220 µH nominal inductance on a ferrite core enabling effective energy storage and filtering in DC-DC converter and power supply circuits
- 4.4 Ω DC resistance in a compact 1816 (4.6 mm x 4.1 mm) rectangular SMT case minimizing board footprint
- General-purpose power inductor construction supporting both buck/boost converter choke and EMI filter applications
- RoHS-compliant (Pb-free) design meeting international environmental regulations for use in modern green electronics
Applications
The Bourns SDR0403-221KL is suited for DC-DC converter output filtering, energy storage choke, and power supply ripple suppression in compact consumer electronics and industrial control equipment. Its 220 µH inductance value is commonly used in low-frequency switching converter stages operating at frequencies between 50 kHz and 200 kHz. The 1816 SMT package enables automated assembly and straightforward integration into power management modules where board space is limited.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 12Weeks |
| YTEOL | 5.7 |
| Case/Size Code | 1816 |
| Construction | Rectangular |
| Core Material | FERRITE |
| DC Resistance | 4.4Ω |
| Inductance-Nom (L) | 220 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| JESD-609 Code | e1 |
| Number of Functions | 1 |
| Package Height | 3.2mm |
| Package Length | 4.5mm |
| Package Style | SMT |
| Package Width | 4mm |
| Packing Method | TR, EMBOSSED, 13 INCH |
| Rated Current-Max | 0.22A |
| Self Resonance Frequency | 4MHz |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | NO |
| Surface Mount | YES |
| Terminal Finish | TIN SILVER COPPER |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | ONE SURFACE |
| Test Frequency | 0.001MHz |
| Tolerance | 10% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8504.50.80.00 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the nominal inductance and DC resistance of the SDR0403-221KL, and how do these parameters affect switching converter efficiency?
The SDR0403-221KL has a nominal inductance of 220 µH and a DC resistance of 4.4 Ω. In a switching converter application, the 4.4 Ω DCR introduces conduction losses equal to I² × R watts, so at 100 mA output current the resistive power loss is approximately 44 mW. Designers targeting high efficiency should evaluate whether the DCR is acceptable for their load current or consider a lower-DCR alternative for currents above 200 mA.
Which converter topologies and switching frequency ranges benefit most from a 220 µH inductance value in a power stage?
A 220 µH inductor is most effective in buck, boost, and flyback converter stages operating at lower switching frequencies, typically between 50 kHz and 200 kHz, where higher inductance values are needed to limit peak-to-peak current ripple to below 30% of the DC output current. At 100 kHz switching frequency with a 5 V input and 3.3 V output, a 220 µH choke limits ripple current to roughly 25 mA in a 100 mA load design, supporting stable regulation.
How does the 1816 case size of the SDR0403-221KL compare to 0805 inductors for space-constrained power supply layouts?
The SDR0403-221KL in a 1816 case (approximately 4.6 mm x 4.1 mm footprint) is larger than an 0805 package (2.0 mm x 1.25 mm), but delivers 220 µH of inductance which is not achievable in the smaller 0805 format at equivalent current ratings. For power supply designs requiring 220 µH, the 1816 footprint is a necessary tradeoff, but its rectangular construction allows efficient copper pour planning around the inductor compared to round wire-wound alternatives.
What is the typical factory lead time for the SDR0403-221KL and how should procurement teams plan for supply chain risk?
The SDR0403-221KL carries a factory lead time of 12 weeks, which is typical for specialty power inductors with ferrite cores. Procurement teams should place orders at least 14 weeks before production start to accommodate order processing and shipping, and should consider maintaining a safety stock of 4 to 8 weeks of consumption. Authorized Bourns distribution channels often maintain buffer stock that can reduce effective lead time to under 2 weeks for standard quantities.
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About Bourns
Bourns is a leading electronic component manufacturer. FindMyChip sources Bourns ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
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