HA3778-ALB

Document 684-1 

## **Shielded Power Inductor** 

## **For NSC LM315x SIMPLe SwItCher**[®] 

- Designed specifically for National Semiconductor LM315x SIMPLE SWITCHER[®] Controllers for applications with output current up to 12 A. 

- L1 on NSC Demonstration Board LM3152-3.3 

- Soft saturation makes it ideal for use in multi-phase VRM/VRD regulators and high current/high frequency DC/DC converters. 

- Flat wire construction for low DCR 

- The materials used eliminate all thermal aging issues 

## **Core material** Powdered iron 

**Terminations** RoHS compliant tin-silver over copper. Other terminations available at additional cost. 

**Weight** 3.44 g 

**Ambient temperature** –40°C to +85°C with I rms current, +85°C to +125°C with derated current 

**Storage temperature** Component: –40°C to +125°C. Packaging: –40°C to +80°C 

**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) 

**Part Inductance** 2 **DCR ±8% SRF typ** 3 **Isat** 4 **Irms** 5 **number** 1 **±20% (µH) (mOhm) (MHz) (A) (A)** HA3778-AL_ 1.65 2.53 55 17 20 

**Mean Time Between Failures (MTBF)** 26,315,789 hours **Packaging** 100/7″ reel; 500/13″ reel Plastic tape: 24 mm wide, 0.4 mm thick,  16 mm  pocket spacing, 7.5 mm pocket depth **PCB washing** Only pure water or alcohol recommended 

## 1. When ordering, please specify **termination** and **packaging** codes: | ~~———~~ **HA3778-ALC** 

- **Termination:  L** = RoHS compliant tin-silver over copper. **Special order: T** = RoHS tin-silver-copper (95.5/4/0.5) or **S** = non-RoHS tin-lead (63/37). 

- **Packaging: C** = 7″ machine-ready reel. EIA-481 embossed plastic tape (100 parts per full reel). 

   - **B** = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter C instead. 

   - **D** = 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (500 parts per full reel). 

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 which the inductance drops 30% (typ) from its value without current. 

5. Current that causes a 40°C temperature rise from 25°C ambient. 

6. Electrical specifications at 25°C. 

Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 

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Dimensions are in [inches ]<br>mm<br>**----- End of picture text -----**<br>


Document 684-1 Revised 09/16/11 

© Coilcraft Inc. 2012 This product may not be used in medical of high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information. 

**US** +1-847-639-6400   sales@coilcraft.com **UK** +44-1236-730595   sales@coilcraft-europe.com **Taiwan** +886-2-2264 3646   sales@coilcraft.com.tw **China** +86-21-6218 8074   sales@coilcraft.com.cn **Singapore** + 65-6484 8412   sales@coilcraft.com.sg 

Document 684-2 

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## **Shielded Power Inductor – hA3778-AL Inductance vs Current** 

## **Inductance vs Frequency** 

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3.0<br>2.5<br>2.0<br>1.5<br>1.65 µH<br>1.0<br>0.5<br>0<br>0.1 1 10 100<br>Current (A)<br>Inductance (µH)<br>**----- End of picture text -----**<br>


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3.0<br>2.5<br>2.0<br>1.5 1.65 µH<br>1.0<br>0.5<br>0<br>0.1 1 10 100<br>Frequency (MHz)<br>Inductance (µH)<br>**----- End of picture text -----**<br>


## **Current Derating** 

## **temperature rise vs Current** 

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120<br>110<br>100<br>90<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>Isat<br>10 Irms<br>0<br>-40 -20 0 20 40 60 80 100 120 140<br>Ambient temperature (°C)<br>25°C<br>Percent of rated current<br>**----- End of picture text -----**<br>


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80<br>70<br>60 1.65 µH<br>50<br>40<br>30<br>20<br>10<br>0<br>0 5 10 15 20 25 30 35<br>Current (Arms)<br>Temperature rise (from 25°C)<br>**----- End of picture text -----**<br>


Document 684-2 Revised 09/16/11 

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**US** +1-847-639-6400   sales@coilcraft.com **UK** +44-1236-730595   sales@coilcraft-europe.com **Taiwan** +886-2-2264 3646   sales@coilcraft.com.tw **China** +86-21-6218 8074   sales@coilcraft.com.cn **Singapore** + 65-6484 8412   sales@coilcraft.com.sg 

© Coilcraft Inc. 2012 This product may not be used in medical of high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information.