SRP4020-1R0M Bourns Inductor (Inductors Precision Moulded) In Stock
Bourns SRP4020-1R0M is a 1µH SMD power inductor in a compact 1616 (4.0mm x 4.0mm) precision-molded package with an iron core, featuring an ultra-low DCR of 21.6 mΩ, designed for high-efficiency DC-DC converters and power management circuits in portable and industrial electronics.
- Manufacturer
- Bourns
- Package
- Inductors Precision Moulded
- Pin Count
- 2
- Lifecycle
- OBSOLETE
- Datasheet
- SRP4020-1R0M Datasheet PDF
- Category
- Inductor
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1µH inductance with 21.6 mΩ DCR (0.0216 Ω) minimizes conduction losses in high-frequency DC-DC converter switching stages
- Iron core in compact 1616 (4.0mm x 4.0mm) precision-molded construction provides high saturation current handling with low magnetic flux leakage
- RoHS-compliant lead-free (e2 code) materials support global environmental compliance in consumer and industrial applications
- General purpose power inductor designation covers buck, boost, and SEPIC converter topologies across a broad frequency range
Applications
The Bourns SRP4020-1R0M is designed for use as the storage inductor in synchronous buck converters, boost converters, and multi-phase power management ICs in smartphones, tablets, and industrial SoC power supplies. Its 1µH value and very low DCR of 21.6 mΩ allow high switching frequencies typically above 500 kHz while maintaining high conversion efficiency and minimal thermal dissipation. The compact 1616 footprint is well-suited for space-constrained power rails on processor core voltage regulators, DDR memory supplies, and portable medical devices.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Case/Size Code | 1616 |
| Construction | Rectangular |
| Core Material | IRON |
| DC Resistance | 0.0216Ω |
| Inductance-Nom (L) | 1 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| JESD-609 Code | e2 |
| Number of Functions | 1 |
| Package Height | 2mm |
| Package Length | 4.8mm |
| Package Style | SMT |
| Package Width | 4mm |
| Packing Method | TR, 13 Inch |
| Rated Current-Max | 5A |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | YES |
| Surface Mount | YES |
| Terminal Finish | COPPER TIN |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Test Frequency | 0.1MHz |
| Tolerance | 20% |
| Package | Inductors Precision Moulded |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8504.50.80.00 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What inductance and DC resistance does SRP4020-1R0M offer, and how do these affect converter efficiency?
The Bourns SRP4020-1R0M provides 1µH nominal inductance with an extremely low DC resistance of 21.6 mΩ (0.0216 Ω). The low DCR directly reduces I²R conduction losses in the inductor; for example, at 3A load current the resistive power loss is only 3² × 0.0216 ≈ 194 mW, enabling DC-DC converters to achieve efficiency levels above 90% in typical step-down applications.
For a 500 kHz synchronous buck converter powering a processor core, how does the 1616 package size of SRP4020-1R0M compare to larger inductors?
The 1616 package (4.0mm x 4.0mm footprint) of the SRP4020-1R0M occupies significantly less PCB area than conventional 2520 (6.3mm x 5.0mm) or 4030 power inductors, making it ideal for processor VRM layouts on compact SoC boards. At 500 kHz, the 1µH inductance allows relatively small ripple current amplitude, reducing output capacitance requirements and enabling further miniaturization of the converter circuit around the SRP4020-1R0M.
How does SRP4020-1R0M handle saturation current in a multi-phase power management design?
The iron core construction of the SRP4020-1R0M provides a hard saturation characteristic, meaning inductance drops sharply when peak current exceeds the saturation rating, which for 1µH inductors in the SRP4020 series typically falls in the 5A to 10A range. In a multi-phase design, each phase carries only a fraction of the total load current (for example, 2A to 3A per phase in a 4-phase 8A design), keeping each SRP4020-1R0M well below saturation and maintaining stable inductance and converter regulation across the full load range.
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