SRR4028-120Y Bourns Inductor (Other) In Stock
Bourns SRR4028-120Y is a 12 µH ferrite core power inductor in a 4.0 x 4.0 mm SMD package with 0.125 Ω DC resistance. Designed for general-purpose power conversion in DC-DC converters and filtering circuits. Available from stock with worldwide shipping.
- Manufacturer
- Bourns
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SRR4028-120Y 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
- 12 µH inductance with only 0.125 Ω DC resistance for efficient power conversion with minimal conduction losses
- Ferrite core construction in compact 4.0 x 4.0 mm (1919) case provides high magnetic permeability and low core loss
- Rectangular SMD package enables automated pick-and-place assembly on standard PCB footprints
- General-purpose power inductor rated for DC-DC converter and EMI filter applications across a wide current range
Applications
The SRR4028-120Y is a general-purpose SMD power inductor optimized for DC-DC buck, boost, and SEPIC converter stages in consumer electronics, industrial power supplies, and embedded systems. Its 12 µH inductance and 0.125 Ω DCR make it effective for output filtering in switching regulators operating at frequencies from 100 kHz to several MHz. The compact 4.0 x 4.0 mm ferrite construction also suits EMI suppression and energy storage applications in space-constrained power management circuits.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 14Weeks |
| YTEOL | 7.3 |
| Case/Size Code | 1919 |
| Construction | Rectangular |
| Core Material | FERRITE |
| DC Resistance | 0.125Ω |
| Inductance-Nom (L) | 12 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| Number of Functions | 1 |
| Package Height | 2.8mm |
| Package Length | 4.8mm |
| Package Style | SMT |
| Package Width | 4.8mm |
| Packing Method | TR, Embossed, 7 Inch |
| Rated Current-Max | 1.12A |
| Self Resonance Frequency | 25MHz |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | YES |
| Surface Mount | YES |
| Terminal Finish | Silver/Nickel/Tin (Ag/Ni/Sn) |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | ONE SURFACE |
| Test Frequency | 0.1MHz |
| Tolerance | 30% |
| 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
Compatible alternatives and drop-in replacements for SRR4028-120Y:
suggested
suggested
Frequently Asked Questions
What is the inductance and DC resistance of the SRR4028-120Y, and how do these values affect converter efficiency?
The SRR4028-120Y has a nominal inductance of 12 µH and a DC resistance of 0.125 Ω. The low DCR minimizes I²R conduction losses at the rated current, which directly improves efficiency in DC-DC converters. For example, at 1 A of continuous inductor current, conduction losses from DCR are only 125 mW, making this part suitable for moderate-power switching regulators.
Which DC-DC converter topologies are best matched to the SRR4028-120Y 12 µH power inductor?
The 12 µH inductance of the SRR4028-120Y is well matched to buck converters operating at switching frequencies between 300 kHz and 2 MHz, as well as boost and SEPIC topologies at similar frequencies. The ferrite core provides good saturation characteristics for output currents typically up to 1 A to 2 A, covering a wide range of point-of-load regulators in IoT devices, microcontroller boards, and portable instruments.
How does the 4.0 x 4.0 mm package size of the SRR4028-120Y compare to larger power inductors in board area savings?
The SRR4028-120Y occupies a 4.0 x 4.0 mm (1919 case code) PCB footprint, which is approximately 40% smaller in area than a 5.0 x 5.0 mm inductor footprint. This size reduction is significant in space-constrained designs such as wearables, compact IoT modules, and multi-channel power stages where several inductors must fit in a limited board region while maintaining a 12 µH inductance value.
What is the factory lead time for SRR4028-120Y and how should procurement teams plan for it?
The factory lead time for SRR4028-120Y is 14 weeks, which is longer than many commodity passives. Procurement teams should establish safety stock of at least 4 to 6 weeks of consumption and place orders well in advance of production ramp-up. For projects with high volume or tight schedules, qualifying an alternative 12 µH ferrite SMD power inductor with a 4.0 x 4.0 mm footprint and similar DCR is advisable to mitigate supply risk.
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