Datasheet 3D Models


Power Inductor for Critical Applications

ST550PRT, ST563PRC feature excellent current handling for a part this size; low DCR.
  • Shielded power inductors.
  • Tin-silver over copper. Other terminations available at additional cost.

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This series provides greater current handling capability than any other power inductor its size. While requiring only one square centimeter of board space, this inductor can handle up to 36 Amps of current.

These shielded inductors were developed for multi-phase voltage regulators and are ideal for use in DC-DC converters, battery-powered devices and high current power supplies. Their flat wire construction ensures very low DC resistance and offers an excellent performance-toheight ratio. The materials used in these parts eliminate all thermal aging issues.

The ST550PRT is a high efficiency part that features very low core loss. The ST563PRC provides soft saturation and is unaffected by part temperature up to 125°C.

Refer to the comparison curves for L vs Current and ESR vs Frequency for performance differences.


Electrical specifications at 25°C.

Low core loss version

Part number 1 Inductance (µH) 2
(Tolerance: ±20%)
DCR ± 8% (mΩ) SRF typ (MHz) 3 Isat (A) 4 Irms (A) 5
ST550PRT251MLZ 0.25 0.93 160 35 25
ST550PRT361MLZ 0.36 0.93 140 24 24
ST550PRT561MLZ 0.56 0.93 110 13 25

Soft saturation version

Part number 1 Inductance (µH) 2
(Tolerance: ±20%)
DCR ± 8% (mΩ) SRF typ (MHz) 3 Isat (A) 4 Irms (A) 5
ST563PRC361MLZ 0.36 0.93 120 36 24
ST563PRC651MLZ 0.65 1.50 115 24 19
ST563PRC112MLZ 1.10 1.95 95 20 20
ST563PRC162MLZ 1.65 2.53 55 17 20
ST563PRC232MLZ 2.30 3.08 50 16 17
  1. When ordering, please specify termination and screening codes: e.g. ST563PRC232MLZ.
  2. Inductance measured at 500 kHz, 0.1 Vrms, 0 Adc using a Coilcraft SMD-A fixture in an Agilent/HP 4284A LCR meter or equivalent.
  3. SRF measured on an Agilent/HP 8753ES.
  4. DC current at 25°C that causes a 30% (typ) inductance drop for ST563PRC and 20% (typ) inductance drop for ST550PRT from its value without current.
  5. Current that causes the specified temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.


  • L = Tin-silver over copper.
  • T = Tin-silver-copper (95.5/4/0.5). (Special order, added cost)
  • S = Tin-lead (63/37). (Special order, added cost)


  • Z = Unscreened
  • H = Coilcraft CP-SA-10001 Group A
  • G= Coilcraft CP-SA-10001 Group A (SLDC Option A)
  • D = Coilcraft CP-SA-10001 Group A (SLDC Option B)
All screening performed to the document’s latest revision.
Custom screening also available.
Ambient temperature range:
–40°C to +85°C with Irms current.
Storage temperature range:
Component: –55°C to +125°C.
Tape and reel packaging: –55°C to +80°C.
Maximum part temperature:
+125°C (ambient + temp rise).
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Performance curves

L vs Current Comparison – 0.36 µH

Current Derating

ESR vs Frequency Comparison – 0.36 µH

L vs Frequency - ST550PRT Series

L vs Current - ST550PRT Series

ESR vs Frequency - ST550PRT Series

L vs Frequency - ST563PRC Series

L vs Current - ST563PRC Series

ESR vs Frequency - ST563PRC Series

Physical characteristics


General specification

Core Material:
ST550PRT: Ferrite
ST563PRC: Powdered iron
550PRT: 2.1 g
563PRC: 2.45 – 3.86 g
ST550PRT251   175/7″ reel. 
ST550PRT361   175/7″ reel. 
ST550PRT561   175/7″ reel. 
ST563PRC361   200/7″ reel.
ST563PRC651   175/7″ reel.
ST563PRC112    175/7″ reel. 
ST563PRC162   100/7″ reel.
ST563PRC232  100/7″ reel.

Plastic tape: 24 mm wide, 16 mm pocket spacing
ST550PRT251   0.4 mm thick, 6.1 mm pocket depth. 
ST550PRT361   0.4 mm thick, 6.1 mm pocket depth.
ST550PRT561   0.4 mm thick, 6.1 mm pocket depth.
ST563PRC361   0.35 mm thick, 4.5 mm pocket depth. 
ST563PRC651   0.4 mm thick, 6.1 mm pocket depth.
ST563PRC112    0.4 mm thick, 6.1 mm pocket depth. 
ST563PRC162   0.4 mm thick, 7.5 mm pocket depth.
ST563PRC232  0.4 mm thick, 7.5 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. See Doc787_PCB_Washing.pdf.