SLF7055T-100M2R0-PF
10µH shielded power inductor, 2.0A rated current, ferrite core, for DC-DC converter applications.
Product Overview
Description
The SLF7055T-100M2R0-PF is a shielded power inductor designed for DC-DC converter applications. With 10µH inductance and 2.0A current rating, this inductor is ideal for buck converters up to approximately 5W output power.
The ferrite drum core with magnetic shielding minimizes EMI radiation and prevents interference with nearby components. The shielded construction also protects the inductor from external magnetic fields.
The 7.0mm x 7.0mm x 5.5mm surface-mount package is compatible with automated assembly processes. The inductor features low DCR (65mΩ typical) for high efficiency and low self-heating.
Product Series
SLF
Primary Application
Buck converters
Key Features
- Shielded construction for low EMI
- 10µH inductance for general DC-DC
- 2.0A continuous current rating
- Low DCR for high efficiency
- Compact 7x7mm footprint
- AEC-Q200 qualified
Specifications
| Inductance | 10µH ±20% @ 1MHz |
|---|---|
| Rated Current | 2.0A (DC) |
| Saturation Current | 2.4A (30% drop) |
| DCR | 65mΩ typical |
| Temperature Range | -40°C to +125°C |
| Package Size | 7.0mm x 7.0mm x 5.5mm |
| Core Material | Ferrite |
| Shielding | Magnetic shield |
Applications
Buck converters
Power conversion and supply
Boost converters
Power conversion and supply
SEPIC converters
Power conversion and supply
LED drivers
Motor drive and control systems
Point-of-load regulators
Power conversion and supply
FAE Expert Insights
"The SLF7055T-100M2R0-PF is one of my most frequently recommended power inductors for general-purpose DC-DC applications. The 10µH value is versatile - it works well for 12V to 5V or 3.3V buck converters at switching frequencies of 500kHz to 2MHz. The shielded construction is a significant advantage for compact designs where components are closely spaced - I've seen unshielded inductors cause interference with nearby analog circuits. The 2.0A rating provides good margin for 1-1.5A output current designs. The AEC-Q200 qualification makes it suitable for automotive applications as well. One tip: the saturation current (2.4A) is reasonably high, but I still recommend keeping peak inductor current below 2.0A for best efficiency and thermal performance."
Versatile shielded inductor for general-purpose DC-DC with good current handling
— Lisa Wang, BeiLuo
Frequently Asked Questions
What is the temperature rise at rated current?
The SLF7055T-100M2R0-PF has a typical temperature rise of 40°C at rated current (2.0A) in still air conditions. This temperature rise is due to resistive losses (I² × DCR) in the copper winding. The actual temperature rise depends on ambient conditions, PCB copper area for heat dissipation, and airflow. For reliable operation, ensure the ambient temperature plus temperature rise doesn't exceed the maximum rated temperature (125°C). For example, at 85°C ambient, the inductor temperature would be approximately 125°C at rated current. For continuous operation at high ambient temperatures, consider derating the current or improving thermal management through larger PCB copper area or forced airflow.
Verify thermal design keeps inductor temperature within ratings; use copper area and airflow for thermal management.
How much does the inductance vary with current?
The SLF7055T-100M2R0-PF exhibits typical ferrite core saturation characteristics. At low currents (below 1A), inductance remains close to the nominal 10µH value. As current increases, the core begins to saturate and inductance gradually decreases. At the saturation current rating of 2.4A, inductance has dropped by 30% to approximately 7µH. Beyond this point, inductance drops more rapidly. This soft saturation characteristic is normal for ferrite inductors and is accounted for in converter design. The inductance vs current curve is provided in the datasheet. For stable converter operation, design for peak currents well below the saturation point where inductance is relatively constant.
Design converter for peak current below saturation knee; account for inductance reduction at high currents.
What is the self-resonant frequency of this inductor?
The SLF7055T-100M2R0-PF has a self-resonant frequency (SRF) of approximately 15-20MHz. The SRF occurs due to the parallel combination of the inductance and the parasitic capacitance between winding turns. Above the SRF, the inductor behaves capacitively rather than inductively. For DC-DC converter applications, the switching frequency (typically 500kHz-2MHz) should be well below the SRF - typically less than 1/5 to 1/10 of SRF. The 10-20MHz SRF of this inductor is suitable for switching frequencies up to 2-4MHz. For higher frequency applications, consider inductors specifically designed for high-frequency operation with lower parasitic capacitance.
Ensure switching frequency is well below SRF; select high-frequency inductors for MHz range converters.
Can this inductor be used in parallel for higher current?
Yes, power inductors can be connected in parallel to increase current handling capability, but this requires careful consideration. When paralleling inductors, current sharing depends on the matching of inductance and DCR values. Due to manufacturing tolerances (typically ±20% for inductance), one inductor may carry more current than the other. For the SLF7055T-100M2R0-PF, paralleling two inductors theoretically provides 4.0A capability, but practical designs should limit to 3.2-3.5A to account for imbalance. The inductors should be placed close together with symmetrical PCB layout to minimize parasitic differences. For best results, select inductors from the same production batch. Alternatively, consider using a single higher-current rated inductor.
Use single higher-current inductor when possible; if paralleling, account for current imbalance.
What is the difference between rated current and saturation current?
Rated current (Irms or Idc) and saturation current (Isat) are two different specifications for power inductors. Rated current is based on thermal limitations - it's the DC current that causes a specified temperature rise (typically 40°C) due to resistive losses in the winding. Exceeding rated current causes excessive heating but doesn't necessarily damage the inductor immediately. Saturation current is the current at which the core material begins to saturate, causing inductance to drop (typically specified as 30% reduction). Operating above saturation current causes increased ripple current, higher losses, and potential converter instability. For reliable operation, design should ensure neither rated current nor saturation current is exceeded under worst-case conditions.
Design for both thermal and saturation limits; saturation current is usually the limiting factor in DC-DC converters.