SDR0302-121KL Bourns Inductor (Other) In Stock
Bourns SDR0302-121KL is a 120 µH general-purpose power inductor in a 1211 (3.2 mm × 3.0 mm) SMD ferrite chip package with 3.2 Ω DC resistance. Designed for power filtering and energy storage in DC-DC converter circuits. Available from stock with worldwide shipping.
- Manufacturer
- Bourns
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SDR0302-121KL 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
- 120 µH nominal inductance in a compact 1211 (3.2 mm × 3.0 mm) SMD ferrite chip package for power filtering and energy storage in DC-DC converters
- 3.2 Ω DC resistance (DCR) ferrite core construction balancing inductance density and power loss in general-purpose power inductor applications
- RoHS-compliant (Pb-free) SMD form factor enabling automated pick-and-place assembly in power management modules and switching regulator circuits
Applications
The SDR0302-121KL is suited for power filtering and energy storage in low-frequency DC-DC converters, EMI suppression filters, and power management modules operating at switching frequencies where 120 µH inductance provides effective ripple current reduction. Its ferrite core construction in the 1211 SMD package makes it a practical choice for battery-powered devices, industrial power supplies, and embedded system power rails where compact size and moderate DCR are acceptable trade-offs.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 12Weeks |
| YTEOL | 5.7 |
| Case/Size Code | 1211 |
| Construction | Rectangular |
| Core Material | FERRITE |
| DC Resistance | 3.2Ω |
| Inductance-Nom (L) | 120 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| JESD-609 Code | e2 |
| Number of Functions | 1 |
| Package Height | 2.5mm |
| Package Length | 3mm |
| Package Style | SMT |
| Package Width | 2.8mm |
| Packing Method | TR, EMBOSSED, 13 INCH |
| Rated Current-Max | 0.22A |
| Self Resonance Frequency | 10MHz |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | NO |
| Surface Mount | YES |
| Terminal Finish | SILVER NICKEL TIN |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | ONE SURFACE |
| Test Frequency | 0.1MHz |
| 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 inductance value and DC resistance does the SDR0302-121KL offer for DC-DC converter designs?
The SDR0302-121KL provides 120 µH nominal inductance with a DC resistance (DCR) of 3.2 Ω. The 120 µH value is suitable for low-frequency switching converters operating at frequencies typically below 500 kHz, where the higher inductance effectively limits ripple current, while the 3.2 Ω DCR introduces a power loss that designers must account for in efficiency calculations.
How does the ferrite core of the SDR0302-121KL compare to iron-powder cores for power inductor applications?
Ferrite cores in inductors like the SDR0302-121KL offer lower core losses at higher frequencies compared to iron-powder cores, but saturate at lower flux densities. The 120 µH ferrite chip inductor is optimized for low-to-medium power filtering applications where switching frequencies are below several hundred kHz and peak currents remain within the saturation current limit to maintain inductance stability.
Which power supply designs benefit from a 120 µH inductor in the SDR0302 1211 package?
A 120 µH inductor in the compact 1211 (3.2 mm × 3.0 mm) SMD package is well suited for step-down (buck) and step-up (boost) converters in battery chargers, portable instruments, and low-power embedded systems where moderate switching frequencies (below 200 kHz) require at least 100 µH to keep output ripple below 50 mV at typical load currents of 50 mA to 200 mA.
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