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0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

SLR4040 Series

High Current Shielded Power Inductors

RoHS compliant halogen free
Coilcraft’s SLR4040 Series of high-current shielded power inductors feature sub-milliohm DC resistance and very high current handling.  Magnetic shielding and tight DCR tolerances make them ideal for low voltage multi-phase VRM/VRD/EVRD regulators and current sensing circuits.
  • Tight DCR tolerance for inductor-DCR-based current sensing circuits
  • Excellent current handling, up to 78 A
  • 4.0 × 4.0 × 4.0 mm surface mount package 
  • Designed for use in multi-phase VRM/VRD/EVRD regulators

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Electrical specifications at 25°C.

Part number 1 Inductance (nH) 2
(Tolerance: ±15%)
DCR ± 10% (mΩ) 3 SRF typ (MHz) Isat (A) 4 Irms (A) 5
at 25°C at 100°C at 125°C 20°C rise 40°C rise
SLR4040-220LE_ 22 0.32 200 78.0 61.0 57.0 24 40
SLR4040-500LE_ 50 0.32 110 39.0 33.5 30.5 24 40
SLR4040-650LE_ 65 0.32 100 31.0 29.3 26.8 24 40
SLR4040-800LE_ 80 0.32 80 24.0 20.2 18.0 24 40
SLR4040-101LE_ 100 0.32 70 18.5 17.0 15.6 24 40
  1. When ordering, please specify packaging code: e.g. SLR4040-101LEC
  2. Inductance tested at 100 kHz, 0.1 Vrms, 0 Adc.
  3. DCR measured on a micro-ohmmeter at the points indicated in the diagram. For other operating temperatures, use this DCR at Temperature calculator.
  4. Isat: DC current that causes a 20% (typ) inductance drop from its value without current. Temperature derating curves.
  5. Irms: Current that causes the specified temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings. Temperature derating curves.
    Irms testing was performed on 0.75 inch wide × 0.25 inch thick copper traces in still air. Temperature rise is highly dependent on many factors including pcb land pattern, trace size, and proximity to other components. Therefore temperature rise should be verified in application conditions.



  • RoHS compliant matte tin over nickel over copper.


  • C = 7″ machine-ready reel. EIA-481 embossed plastic tape (500 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (2000 parts per full reel).
RoHS compliant , halogen free
Ambient temperature range:
–40°C to +85°C with (40°C rise) Irms current
Storage temperature range:
Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+125°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Performance curves

Physical characteristics



Tape and Reel specification


Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
7" (178 mm) 13" (330 mm) A B C D E W P Po P1 H T part_or_z.gif
500 2000* 178/330 60/100 13 18,4 12,4 12 8 4 2 4,0 0,35
* Special order

General specification

Core Material:
2.4 g
500/7″ reel; 2000/13″ reel; Plastic tape: 12 mm wide, 0.35 mm thick, 8 mm pocket spacing, 4 mm pocket depth


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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