74437324220 Würth Elektronik Inductor (Other) In Stock
The 74437324220 is a 22 µH powdered-iron core general-purpose power inductor in a 1816 SMD package from Würth Elektronik. It features 0.5 Ω DC resistance and a rectangular chip construction rated for power conversion applications. Available from stock with worldwide shipping.
- Manufacturer
- Würth Elektronik
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- 74437324220 Datasheet PDF
- Category
- Inductor
- Price
- From $0.4851(MOQ 100)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 22 µH inductance with 0.5 Ω DC resistance in a compact 1816 SMD package for efficient power inductor designs
- Powdered iron core material providing excellent saturation characteristics and low core losses at switching frequencies
- General-purpose power inductor construction suitable for DC-DC converter filtering, energy storage, and EMI suppression
Applications
The 74437324220 power inductor is used in DC-DC buck and boost converter output filter stages operating at switching frequencies from 100 kHz to several hundred kHz, where its 22 µH inductance reduces output ripple on 3.3 V to 12 V regulated rails. Its powdered iron core provides stable inductance under load current conditions, making it suitable for point-of-load power supplies in industrial control systems, embedded computing, and automotive accessory modules. The 1816 SMD footprint integrates directly into standard SMT assembly lines for high-volume power supply PCB production.
Specifications
| YTEOL | 15 |
| Case/Size Code | 1816 |
| Construction | Rectangular |
| Core Material | POWDERED IRON |
| DC Resistance | 0.5Ω |
| Inductance-Nom (L) | 22 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| JESD-609 Code | e2 |
| Number of Functions | 1 |
| Package Height | 1.8mm |
| Package Length | 4.45mm |
| Package Style | SMT |
| Package Width | 4.06mm |
| Packing Method | TR, Embossed Plastic, 13 Inch |
| Rated Current-Max | 1A |
| Self Resonance Frequency | 14MHz |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | YES |
| Special Feature | INDUCTANCE IS MEASURED AT 10 MILLI AMPERE |
| Surface Mount | YES |
| Terminal Finish | Tin/Copper (Sn/Cu) |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Test Frequency | 0.1MHz |
| Tolerance | 20% |
| 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 DC resistance of the 74437324220 and how does it affect efficiency in a DC-DC converter output filter?
The 74437324220 has a DC resistance of 0.5 Ω, which causes a conduction loss equal to I² x 0.5 Ω at the rated output current. For a 1 A output current, this translates to 0.5 W of power dissipation in the inductor, which must be factored into the thermal budget of a 5 V to 3.3 V buck converter design. Selecting an inductor with lower DCR below 0.2 Ω would reduce losses, but the 0.5 Ω value is acceptable for low-current applications below 500 mA where efficiency targets are above 85%.
Why is a powdered iron core chosen for the 74437324220 over ferrite in switching power supply designs?
Powdered iron cores in the 74437324220 offer a distributed air gap that provides soft saturation behavior, meaning inductance decreases gradually as current increases rather than dropping sharply as with ungapped ferrite cores. This characteristic keeps the 22 µH inductor from abrupt saturation in DC-DC converters handling load transients up to several amperes, reducing the risk of current runaway. Powdered iron also exhibits lower core loss than ferrite at frequencies below 500 kHz, making it cost-effective for general-purpose 100 kHz to 300 kHz switching converter output filters.
What switching frequency range is the 74437324220 suited for in a buck converter, and how does the 22 µH value affect ripple current?
The 74437324220 with 22 µH inductance is well-matched to buck converters switching at 100 kHz to 500 kHz, where the inductor stores and releases energy each switching cycle. At 200 kHz with a 12 V input and 5 V output, the theoretical peak-to-peak ripple current through the 22 µH inductor is approximately 159 mA (calculated as V_off x D / (L x f)), which is low enough to achieve less than 5% output voltage ripple on a 100 µF output capacitor without additional LC stages.
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About Würth Elektronik
Würth Elektronik is a leading electronic component manufacturer. FindMyChip sources Würth Elektronik ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
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| 465+ | $0.5411 | $251.61 |
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