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
- Price
- From $0.3270(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SRR4028-120Y?
- 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
What is SRR4028-120Y used for?
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.
What are the specifications of SRR4028-120Y?
| 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 |
Where can I find the SRR4028-120Y datasheet?
SRR4028-120Y Datasheet DownloadOfficial datasheet from Bourns
What are equivalent replacements for SRR4028-120Y?
Compatible alternatives and drop-in replacements for SRR4028-120Y:
suggested
suggested
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.
Related Guides
ICL7660ACPAZ Negative Voltage Charge Pump Design Guide
Design a reliable ICL7660ACPAZ negative rail with capacitor equations, layout rules, startup checks, and practical troubleshooting.
Aug 2, 2026
C0402C103K3RACTU 10 nF MLCC Design Guide
Practical guidance for applying the C0402C103K3RACTU 10 nF, 25 V X7R MLCC in decoupling, filtering, timing, and EMI-control networks.
Aug 2, 2026
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
Why Buy from FindMyChip
About Bourns
Bourns is a leading electronic component manufacturer. FindMyChip sources Bourns ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.6500 | $0.65 |
| 10+ | $0.5380 | $5.38 |
| 100+ | $0.4421 | $44.21 |
| 1000+ | $0.3460 | $346.00 |
| 2500+ | $0.3365 | $841.15 |
| 3500+ | $0.3270 | $1144.54 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
You May Also Like
L08058R2DEWTR
AVX
Inductor
74455047
Würth Elektronik
Inductor
NLFV25T-2R2M-PF
TDK
Inductor
VLS201610HBX-R47M-1
TDK
Inductor
744311330
Würth Elektronik
Inductor
B82732F2901B001
EPCOS
Inductor
B82733F2112B001
EPCOS
Inductor
7447714331
Würth Elektronik
Inductor
7443340330
Würth Elektronik
Inductor
744771122
Würth Elektronik
Inductor
74437324022
Würth Elektronik
Inductor
74437324033
Würth Elektronik
Inductor
7440430022
Würth Elektronik
Inductor
B66202B1108T001
EPCOS
Inductor
CLF10060NIT-470M-D
TDK
Inductor
ETQ-P5M470YFC
Panasonic
Inductor
MLZ2012M470WT000
TDK
Inductor
7443634700
Würth Elektronik
Inductor
74435574700
Würth Elektronik
Inductor
7447709470
Würth Elektronik
Inductor
744771147
Würth Elektronik
Inductor
ELL-6UH470M
Panasonic
Inductor
XFL4020-152MEB
COILCRAFT
Inductor
XFL4020-472MEB
COILCRAFT
Inductor