SWPA5040S

Product Overview

The Sunlord SWPA5040S100MT is a wire-wound SMD power inductor delivering 10 μH inductance with ±20% tolerance in a compact 5.0 × 5.0 × 4.0 mm package. Part of Sunlord's high-performance SWPA A-Series, this inductor is engineered for modern power circuits where board space is at a premium and current demands are relentless.

What sets the SWPA series apart is its 30%+ higher current capacity versus traditional inductors of the same footprint. This means you can either deliver more power in the same PCB area, or downsize to a smaller package without sacrificing performance — a decisive edge in space-constrained designs such as smartphones, wearables, and high-density DC-DC converters.

The SWPA5040S100MT is purpose-built for buck/boost converters, voltage regulator modules (VRMs), and multi-rail power management where stable inductance under load, low loss, and wide temperature operation are non-negotiable.

Key Design Challenges Solved

Pain Point 1 — PCB Space Shortage: Thinner Products, Tighter Boards

As end products trend toward slim, lightweight form factors, PCB real estate shrinks dramatically. Power inductors often consume a disproportionate share of board area in DC-DC converter stages, forcing engineers into painful trade-offs between power delivery capability and physical footprint.

✅ Solution: The SWPA series delivers 30%+ higher rated current in the same package size compared to conventional wire-wound inductors. For a given power rail requirement, you can step down to a smaller SWPA package and still meet your current budget. The full series spans 0.22 μH to 680 μH, covering every power topology from high-frequency point-of-load converters to multi-phase VRMs — all from a single, consistent platform.

Pain Point 2 — Fast Charging & Multi-Core GPU Loads: Inductor Saturation and Thermal Throttling

Fast-charging protocols (USB-PD, SuperVOOC) and multi-core GPU subsystems push instantaneous load currents far beyond steady-state levels. A conventional inductor that saturates under these peaks loses inductance sharply, causing output ripple to spike, efficiency to collapse, and the entire device to throttle or overheat.

✅ Solution: The SWPA5040S100MT features high saturation current (Isat) with a slow, graceful inductance roll-off under heavy load — not the abrupt saturation knee seen in commodity inductors. Combined with low DC resistance (DCR) that minimizes I²R copper losses, and an ample temperature rise current margin, this inductor keeps efficiency high and junction temperatures under control even during sustained fast-charge sessions or GPU-intensive workloads.

Technical Specifications

SWPA Series Lineup — Hot-Selling Models

Key Advantages

• 30% Higher Current in Same Size: Compared to conventional wire-wound inductors of identical footprint, SWPA delivers 30%+ higher rated current — shrink your PCB or boost your power.
• Low DCR for Energy Efficiency: Low DC resistance minimizes I²R losses, reducing self-heating and improving overall power conversion efficiency.
• Full Inductance Coverage: 0.22 μH – 680 μH: From small-inductance high-frequency boost to large-inductance low-voltage buck, the SWPA series covers every common power topology.
• High Saturation Current (Isat): Magnetic saturation sets in later and decays slower. SWPA inductors maintain stable inductance under peak transient loads without triggering thermal protection.
• Wide Operating Temp: -40°C to +125°C: Automotive-grade temperature range ensures reliable operation in harsh environments.
• Multiple Compact SMD Packages: Available in 3015, 4012, 4030, 5040, 6045 and more — optimized for different power and space requirements.

Target Applications

About Sunlord

Shenzhen Sunlord Electronics Co., Ltd. is one of the world's leading manufacturers of inductive components, serving global customers across consumer electronics, automotive, telecommunications, and industrial markets. Listed on the Shenzhen Stock Exchange (SZSE: 002138), Sunlord's vertically integrated manufacturing — from ferrite material formulation to automated winding and testing — ensures consistent quality, competitive pricing, and reliable supply.