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cps@coilcraft.com www.coilcraft-cps.com © Coilcraft, Inc. 2012 Specifications subject to change without notice. Please check our website for latest information. Coupled Inductors for Critical Applications Dimensions are in inches mm Core material Ferrite Terminations RoHS compliant matte tin over nickel over phos bronze. Other terminations available at additional cost. Weight 0.76 – 0.87g Ambient temperature –40°C to +85°C with Irms current, +85°C to +125°C with derated current Storage temperature Component: –55°C to +125°C. Tape and reel packaging: –55°C to +80°C Winding to winding isolation 200 Vrms Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Packaging 250/7″ reel; 1000/13″ reel Plastic tape: 16 mm wide, 0.4 mm thick, 12 mm pocket spacing, 4.9 mm pocket depth 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 transformer. L1 L2 + + D C C Typical Flyback Converter VOUT VIN SW D D C C SW Typical Buck Converter with auxiliary output Typical SEPIC schematic VOUT VOUT VOUTAUX VIN VIN L2Q C D Document ST621-1 Revised 02/15/12

7342 COUPLED INDUCTORS

0.295 7,5 max 0.295 7,5 max max Dot indicates pin 1 0.150 3,8 0.091 2,3 0.063 1,6 0.028 0,7 0.181 4,6 123 0.110 2,8 0.083 2,1 0.130 3,3 0.043 1,10 1 2 L1 L2 Recommended Land Pattern Suggested Land Pattern

Coupled Inductors – ST526PND cps@coilcraft.com www.coilcraft-cps.com © Coilcraft, Inc. 2012 Specifications subject to change without notice. Please check our website for latest information. Document ST621-2 Revised 02/15/12 Coupling Leakage Isat (A)6 I rms (A) Inductance2 DCR max3 SRF typ4 coefficient L typ5 10% 20% 30% both one Part number1 ±20% (µH) (Ohms) (MHz) typ (µH) drop drop drop windings7 winding8 1. When ordering, please specify termination and testing codes: ST526PND105MLZ Termination: L = RoHS compliant matte tin over nickel over phos bronze. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Testing: Z = COTS H = Screening per Coilcraft CP-SA-10001 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 which the inductance drops the specified amount 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. See temperature rise calcu- lation. 8. Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. 9. Electrical specifications at 25°C. Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.” Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Temperature rise calculation based on specified Irms Coupled Inductor Core and Winding Loss Calculator This web-based utility allows you to enter frequency, peak-to-peak (ripple) current, and Irms current to predict temperature rise and overall losses, including core loss. Visit www.coilcraft-cps.com/coupledloss. Temperature rise ( t) = Winding power loss × 129°C W/c68 /c68t =× 129°C W(+) × DCRIIL1 Winding power loss = (+) × DCR in Watts (W)IIL1 Example 1. 526PND-123ML (Equal current in each winding) Winding power loss = (1.14 +1.14 ) × 0.120 = 0.312 W t = 0.312 W × 129°C W = 40°C /c68 Example 2. (= 1.4 A, Winding p -123ML = 0.6 A)526PND IIL1 L2 22ower loss = (1.4 +0.6 ) × 0.120 = 0.278 W t = 0.278 W × 129°C W = 36°C/c68

Coupled Inductors – ST526PND cps@coilcraft.com www.coilcraft-cps.com © Coilcraft, Inc. 2012 Specifications subject to change without notice. Please check our website for latest information. Document ST621-3 Revised 02/15/12 Typical L vs Current Typical L vs Frequency Irms Derating 100 1000 10000 0.01 0.1 101 Current (A) Inductance (µH) 4.7 µH 10 µH 47 µH 100 µH 470 µH 1000 µH 100 1000 10000 0.1 1 10010 Frequency (MHz) Inductance (µH) 4.7 µH 10 µH 47 µH 100 µH 470 µH 1000 µH -40 -20 02 04 06 08 0 100 140120 Ambient temperature (°C) 120 110 100 25°C Pe rcent of rated rmsI