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Close up of ST526PND
3D Model Datasheet

ST526PND Series

Coupled Inductors for Critical Applications

Tight coupling (k ≥ 0.97) and 200 V isolation make the ST526PND series of coupled inductors ideal for use in a variety of circuits including flyback, multi-output buck and SEPIC.
These inductors provide high inductance, high efficiency and excellent current handling in a rugged, low cost part.

They can also be used as two single inductors connected in series or parallel, as a common mode choke or as a 1:1 transformer.

Looking for the commercial version of this part? See Coilcraft MSD7342 Series
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Specifications

Electrical specifications at 25°C.

For Flyback Applications

Part number 1 Inductance (µH) 2
(Tolerance: ±20%) 		DCR max (Ω) 3 Isolation
Voltage (V) 		Leakage
Inductance (µH) 5
ST526PND252MLZ 2.5 0.033 200 0.14
ST526PND332MLZ 3.3 0.037 200 0.090
ST526PND472MLZ 4.7 0.051 200 0.11
ST526PND562MLZ 5.6 0.063 200 0.090
ST526PND682MLZ 6.8 0.070 200 0.14
ST526PND822MLZ 8.2 0.075 200 0.25
ST526PND103MLZ 10 0.10 200 0.30
ST526PND123MLZ 12 0.12 200 0.36
ST526PND153MLZ 15 0.13 200 0.49
ST526PND183MLZ 18 0.17 200 0.16
ST526PND223MLZ 22 0.22 200 0.20
ST526PND273MLZ 27 0.25 200 0.20
ST526PND333MLZ 33 0.27 200 0.15
ST526PND393MLZ 39 0.38 200 0.70
ST526PND473MLZ 47 0.42 200 0.30
ST526PND563MLZ 56 0.46 200 0.51
ST526PND683MLZ 68 0.60 200 0.51
ST526PND823MLZ 82 0.68 200 1.2
ST526PND104MLZ 100 0.77 200 0.96
ST526PND124MLZ 120 1.0 200 0.61
ST526PND154MLZ 150 1.4 200 0.54
ST526PND184MLZ 180 1.5 200 0.75
ST526PND224MLZ 220 1.7 200 1.4
ST526PND274MLZ 270 2.4 200 1.6
ST526PND334MLZ 330 2.7 200 1.7
ST526PND394MLZ 390 3.1 200 4.7
ST526PND474MLZ 470 4.0 200 5.5
ST526PND564MLZ 560 4.4 200 4.9
ST526PND684MLZ 680 5.0 200 7.6
ST526PND824MLZ 820 6.8 200 8.0
ST526PND105MLZ 1000 7.8 200 8.7

For SEPIC Applications

Part number 1 Inductance (µH) 2
(Tolerance: ±20%) 		DCR max (Ω) 3 SRF Typ (MHz) 4 Coupling coefficient Leakage
Inductance (µH) 5 		Isat (A) 6 Irms (A)
10% drop 20% drop 30% drop both windings 7 one winding 8
ST526PND252MLZ 2.5 0.033 55.0 0.97 0.14 6.0 6.2 6.3 2.17 3.06
ST526PND332MLZ 3.3 0.037 43.0 0.99 0.090 5.2 5.3 5.4 2.05 2.89
ST526PND472MLZ 4.7 0.051 35.0 0.99 0.11 4.1 4.3 4.6 1.74 2.46
ST526PND562MLZ 5.6 0.063 32.0 0.99 0.090 3.9 4.1 4.2 1.57 2.22
ST526PND682MLZ 6.8 0.070 30.0 0.99 0.14 3.7 3.8 3.9 1.49 2.10
ST526PND822MLZ 8.2 0.075 27.0 0.98 0.25 3.3 3.4 3.5 1.44 2.03
ST526PND103MLZ 10 0.10 22.0 0.98 0.30 2.8 2.9 3.0 1.24 1.76
ST526PND123MLZ 12 0.12 20.0 0.98 0.36 2.5 2.6 2.7 1.14 1.61
ST526PND153MLZ 15 0.13 18.0 0.98 0.49 2.2 2.3 2.4 1.09 1.54
ST526PND183MLZ 18 0.17 15.0 >0.99 0.16 2.0 2.2 2.3 0.95 1.35
ST526PND223MLZ 22 0.22 13.5 >0.99 0.20 1.9 2.0 2.1 0.84 1.19
ST526PND273MLZ 27 0.25 12.0 >0.99 0.20 1.7 1.8 1.9 0.79 1.11
ST526PND333MLZ 33 0.27 11.0 >0.99 0.15 1.5 1.6 1.7 0.76 1.07
ST526PND393MLZ 39 0.38 10.0 0.99 0.70 1.3 1.4 1.5 0.64 0.90
ST526PND473MLZ 47 0.42 9.5 >0.99 0.30 1.2 1.3 1.4 0.61 0.86
ST526PND563MLZ 56 0.46 8.7 >0.99 0.51 1.1 1.2 1.3 0.58 0.82
ST526PND683MLZ 68 0.60 7.3 >0.99 0.51 1.0 1.1 1.2 0.51 0.72
ST526PND823MLZ 82 0.68 6.2 0.99 1.2 0.90 1.0 1.1 0.48 0.67
ST526PND104MLZ 100 0.77 5.5 >0.99 0.96 0.80 0.92 0.98 0.45 0.63
ST526PND124MLZ 120 1.0 4.5 >0.99 0.61 0.70 0.80 0.90 0.39 0.55
ST526PND154MLZ 150 1.4 4.0 >0.99 0.54 0.65 0.76 0.80 0.34 0.48
ST526PND184MLZ 180 1.5 3.8 >0.99 0.75 0.62 0.66 0.73 0.32 0.45
ST526PND224MLZ 220 1.7 3.5 >0.99 1.4 0.59 0.62 0.66 0.30 0.42
ST526PND274MLZ 270 2.4 3.3 >0.99 1.6 0.55 0.57 0.60 0.25 0.36
ST526PND334MLZ 330 2.7 3.0 >0.99 1.7 0.49 0.52 0.54 0.24 0.34
ST526PND394MLZ 390 3.1 2.8 0.99 4.7 0.45 0.47 0.50 0.23 0.32
ST526PND474MLZ 470 4.0 2.6 0.99 5.5 0.41 0.43 0.46 0.20 0.28
ST526PND564MLZ 560 4.4 2.5 >0.99 4.9 0.38 0.40 0.42 0.19 0.26
ST526PND684MLZ 680 5.0 2.3 0.99 7.6 0.36 0.37 0.38 0.18 0.25
ST526PND824MLZ 820 6.8 2.2 >0.99 8.0 0.30 0.32 0.35 0.15 0.21
ST526PND105MLZ 1000 7.8 2.0 >0.99 8.7 0.27 0.29 0.31 0.14 0.20
Notes
  1. When ordering, please specify termination and screening codes: e.g. ST526PND105MLZ.
  2. Inductance shown for each winding, measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads are connected in parallel, inductance is the same value. When leads are connected in series, inductance is four times the value.
  3. DCR is for each winding. When leads are connected in parallel, DCR is half the value. When leads are connected in series, DCR is twice the value.
  4. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value.
  5. Leakage inductance is for L1 and is measured with L2 shorted.
  6. DC current at 25°C that causes the specified inductance drop from its value without current It is the sum of the current flowing in both windings.
  7. Equal current when applied to each winding simultaneously that causes a 40°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.
  8. Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.
Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.”

Termination:

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

Screening:

  • Z = Unscreened
  • Y = Unscreened (SLDC Option A)
  • W = Unscreened (SLDC Option B)
  • H = Group A screening per Coilcraft CP-SA-10001
  • 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.
Environmental
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):
See FIT/MTBF Calculations

Performance curves

Typical L vs Current

Typical L vs Current

Typical L vs Frequency

Typical L vs Frequency

Schematics

st526pnd_schem.png

Physical characteristics

st526pnd_dim.png

General specification

Core Material:
Ferrite
Weight:
0.76 – 0.87g
Winding to Winding Isolation:
200 Vrms

Soldering/Washing

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.