# Power Inductor (SMD), 270 µH, 380 mA, Shielded, 460 mA, SRR0745A

![Product image](https://novapart.co/image/farnell:2455056/)

**URL**: https://novapart.co/products/SRR0745A-271M/power-inductor-smd-270-h-380-ma-shielded-460
**SKU**: SRR0745A-271M
**Manufacturer**: BOURNS
**Category**: Passive Components || Inductors || Power Inductors || SMD Power Inductors
**Price**: €0.6260
**Stock**: 10+

## Specifications

| Parameter | Value |
|---|---|
| Inductance | 270µH |
| Product Range | SRR0745A |
| Product Width | 7.3mm |
| Product Height | 4.5mm |
| Product Length | 7.3mm |
| Dc Resistance Max | 1.2ohm |
| Rms Current (Irms) | 380mA |
| Power Inductor Case | 7.3mm x 7.3mm x 4.5mm |
| Inductance Tolerance | ± 20% |
| Inductor Construction | Shielded |
| Saturation Current (Isat) | 460mA |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2455056/)

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*RoHS COMPLIANT& AEC-Q200 QUALIFIED<br>**----- End of picture text -----**<br>


## **Features** 

n Shielded construction n Inductance range: 10 to 1000 μH n Heating current up to 2.1 A n Dimensions: 7.3 x 7.3 x 4.5 mm n AEC-Q200 qualified n RoHS compliant* and halogen free** 

## **Applications** 

n Automotive systems: -  Driver assistant      -  Entertainment -  Information -  Lighting 

n DC/DC converters 

n Power supplies 

## **SRR0745A Series - Shielded Power Inductors** BOURNS ~~i~~ 

~~**Electrical Specifcations @ 25 °C**~~ 

## ~~**General Specifcations**~~ 

Operating Temperature ................................-40 °C to +125 °C (Temperature rise included) Storage Temperature ................................-40 °C to +125 °C Resistance to Solder Heat .............................+250 °C for 10 sec. Temperature Rise .......................40 °C typ. at rated Irms Inductance drop ...................25 % at Isat 

|**Bourns**<br>**Part Number**<br>~~ee~~<br>~~ee~~|**Inductance**<br>**@ 1 kHz / 1 V**<br>~~ee~~|**Inductance**<br>**@ 1 kHz / 1 V**<br>~~ee~~|**DCR**<br>**(**W**)**<br>**Max.**<br>~~eee~~<br>~~se~~|**I rms**<br>**(A)**<br>~~eee~~<br>~~se~~|**I sat**<br>**(A)**<br>~~eee~~<br>~~se~~|*****K-**<br>**Factor**<br>~~eee~~<br>~~se~~|
|---|---|---|---|---|---|---|
||**L(µH)**<br>~~ee~~<br>~~es ee~~|**Tol.(%)**<br>~~ee~~<br>~~ee~~|||||
|SRR0745A-100M<br>~~ee~~<br>~~ee~~|10<br>~~ee~~<br>~~es ee~~|±20<br>~~ee~~<br>~~ee~~|0.052<br>~~eee~~<br>~~se~~|2.1<br>~~eee~~<br>~~se~~|2.5<br>~~eee~~<br>~~se~~|112<br>~~eee~~<br>~~se~~|
|SRR0745A-120M<br>~~ee ~~<br>~~es~~|12<br> ~~es ee~~<br>~~es~~|±20<br>~~ee ~~<br>~~es~~|0.062<br> ~~se~~<br>~~es~~|2.0<br>~~se~~<br>~~es~~|2.3<br>~~se~~<br>~~es~~|98<br>~~se~~<br>~~es~~|
|SRR0745A-150M<br>~~es~~<br>~~a~~|15<br>~~es~~<br>~~es~~|±20<br>~~es~~|0.075<br>~~es~~|1.9<br>~~es~~|2.1<br>~~es~~|88<br>~~es~~|
|SRR0745A-180M<br>~~a~~<br>~~es~~|18<br>~~es~~<br>~~es~~|±20|0.09|1.8|1.95|83|
|SRR0745A-220M<br>~~a~~<br>~~es~~|22<br>~~es~~<br>~~es~~|±20|0.096|1.65|1.75|72|
|SRR0745A-270M<br>~~es~~<br>~~es~~<br>~~ee~~|27<br>~~es~~<br>~~es~~<br>~~se~~|±20<br>~~es~~<br>~~se~~|0.13<br>~~es~~|1.45<br>~~es~~|1.62<br>~~es~~|66<br>~~es~~|
|SRR0745A-330M<br>~~es~~<br>~~ee~~<br>~~a~~|33<br>~~es~~<br>~~se~~<br>|±20<br>~~es~~<br>~~se~~<br>~~ee~~<br>|0.15<br>~~es~~<br>~~ee~~<br>|1.35<br>~~es~~<br>|1.45<br>~~es~~<br>|59<br>~~es~~<br>|
|SRR0745A-390M<br>~~ee~~<br>~~es~~<br>~~a~~|39<br>~~se~~<br>~~es~~<br>|±20<br>~~se~~<br>~~es~~<br>~~ee~~<br>|0.19<br>~~es~~<br>~~ee~~<br>|1.17<br>~~es~~<br>|1.3<br>~~es~~<br>|55<br>~~es~~<br>|
|SRR0745A-470M<br>~~es~~<br>~~a~~|47<br>~~es~~<br>|±20<br>~~es~~<br>~~ee~~<br>|0.21<br>~~es~~<br>~~ee~~<br>|1.05<br>~~es~~<br>|1.2<br>~~es~~<br>|50<br>~~es~~<br>|
|SRR0745A-560M<br>~~es~~<br>~~ee~~|56<br>~~es~~|±20<br>~~es~~|0.24<br>~~es~~|0.95<br>~~es~~|1.1<br>~~es~~|47<br>~~es~~|
|SRR0745A-680M<br>~~ee~~|68|±20|0.3|0.86|0.96|41|
|SRR0745A-820M<br>~~ee~~<br>~~es~~<br>~~a~~|82<br>~~es~~<br>~~es~~|±20<br>~~es~~<br>~~es~~|0.4<br>~~es~~|0.78<br>~~es~~|0.9<br>~~es~~|38<br>~~es~~|
|SRR0745A-101M<br>~~a~~<br>~~es~~|100<br>~~es~~<br>~~es~~|±20<br>~~es~~|0.45|0.7|0.78|34|
|SRR0745A-121M<br>~~a~~<br>~~es~~<br>~~es~~|120<br>~~es~~<br>~~es~~<br>~~es~~|±20<br>~~es~~|0.55|0.6|0.7|32|
|SRR0745A-151M<br>~~es ~~<br>~~es~~<br>~~ee~~|150<br> ~~es~~<br>~~es~~|±20|0.76|0.48|0.58|29|
|SRR0745A-181M<br>~~es ~~<br>~~ee~~|180<br> ~~es~~|±20<br>~~ee~~|0.82<br>~~ee~~|0.46|0.54|26|
|SRR0745A-221M<br>~~ee~~<br>~~es~~|220<br>~~es~~|±20<br>~~es~~<br>~~ee~~|0.95<br>~~es~~<br>~~ee~~|0.42<br>~~es~~|0.5<br>~~es~~|23<br>~~es~~|
|SRR0745A-271M<br>~~es~~|270<br>~~es~~|±20<br>~~es~~<br>~~ee~~|1.2<br>~~es~~<br>~~ee~~|0.38<br>~~es~~|0.46<br>~~es~~|22<br>~~es~~|
|SRR0745A-331M<br>~~es~~|330<br>~~es~~|±20<br>~~es~~|1.5<br>~~es~~|0.34<br>~~es~~|0.4<br>~~es~~|20<br>~~es~~|
|SRR0745A-391M<br>SRR0745A-471M<br>~~es~~<br>~~es~~|390<br>470<br>~~es~~<br>~~es~~|±20<br>±20<br>~~es~~<br>~~es~~|1.85<br>2.2<br>~~es~~<br>~~es~~|0.32<br>0.29<br>~~es~~<br>~~es~~|0.36<br>0.34<br>~~es~~<br>~~es~~|18<br>16<br>~~es~~<br>~~es~~|
|SRR0745A-471M<br>~~es~~|470<br>~~es~~|±20<br>~~es~~|2.2<br>~~es~~|0.29<br>~~es~~|0.34<br>~~es~~|16<br>~~es~~|
|SRR0745A-561M<br>~~es~~<br>~~a~~|560<br>~~es~~<br>~~es ee~~|±20<br>~~es~~<br>~~ee~~|2.6<br>~~es~~|0.26<br>~~es~~|0.3<br>~~es~~|15<br>~~es~~|
|SRR0745A-681M<br>~~a~~<br>~~es~~|680<br>~~es ee~~<br>~~es~~|±20<br>~~ee~~<br>~~es~~|2.8|0.24|0.28|13|
|SRR0745A-821M<br>SRR0745A-102M<br>~~a~~<br>~~es ~~<br>~~Re~~|820<br>1000<br>~~es ee~~<br> ~~es~~<br>~~Ps~~|±20<br>±20<br>~~ee~~<br>~~es~~|3.5<br>4.1|0.22<br>0.2|0.26<br>0.24|12<br>11|



## ~~**Materials**~~ 

Core ..............................................Ferrite Wire ............................Enameled copper Terminal Finish ...................................Sn Packaging .................. 1000 pcs. per reel 

## ~~**Product Dimensions**~~ 

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**----- Start of picture text -----**<br>
7.30 ± 0.2<br>( .008)<br>7.30 ± 0.2<br>(.287 ± .008)<br>|<br>4.60 4.50 ± 0.2<br>TYP.<br>(.181) (.177 ± .008)<br>2.00 \e=yY<br>TYP.<br>(.079)<br>**----- End of picture text -----**<br>


***K-Factor: To calculate core flux density, Bp-p (gauss) = K x L(µH) x Δ I (peak-to-peak ripple current, 

A), determine core loss from _Core Loss vs. Flux Density_ plot. 

## ~~**Core Loss vs. Flux Density**~~ 

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**----- Start of picture text -----**<br>
10000 4.60 4.50 ± 0.2<br>TYP.<br>(.181) (.177 ± .008)<br>2.00 \e=yY<br>TYP.<br>1000 _ 800 KHz _ 100 KHz (.079)<br>500 KHz   50 KHz<br>= 300 KHz200 KHz   10 KHz ro o£<br>100<br>10<br>Recommended Layout<br>2.40<br>1 (.094)<br>0.1<br>1.50 1.50<br>(.059) 4.80 (.059)<br>0.01 (.189)<br>100 1000 10000<br>MM<br>DIMENSIONS:<br>Flux Density Bp-p (gauss) (INCHES)<br>Core Loss (mW)<br>**----- End of picture text -----**<br>


- RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011. 

** Bourns follows the prevailing definition of “halogen free” in the industry.  Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less. Specifications are subject to change without notice. 

The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications. 

## **SRR0745A Series - Shielded Power Inductors** 

## ~~**Inductance vs. IDC**~~ 

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SRR0745A-470M SRR0745A-101M SRR0745A-221M<br>L @ 25 °C L @ 125 °C L @ 25 °C L @ 125 °C L @ 25 °C L @ 125 °C<br>60.0 120.0 250.0<br>50.0<br>200.0<br>90.0<br>40.0<br>150.0<br>30.0 60.0<br>100.0<br>20.0<br>30.0<br>10.0 50.0<br>0.0 0.0 0.0<br>0.0 0.3 0.6 0.9 1.2 1.5 1.8 0.0 0.3 0.6 0.9 1.2 0.0 0.2 0.4 0.6 0.8<br>IDC (A) IDC (A) IDC (A)<br>L (µH) L (µH) L (µH)<br>**----- End of picture text -----**<br>


## ~~**Temperature Rise vs. IDC**~~ 

**SRR0745A-221M** 

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SRR0745A-470M SRR0745A-101M SRR0745A-221M<br>ΔT @ 25 °C ΔT @ 25 °C ΔT @ 25 °C<br>80.0 80.0 60.0<br>50.0<br>60.0 60.0<br>40.0<br>40.0 40.0 30.0<br>20.0<br>20.0 20.0<br>10.0<br>0.0 0.0 0.0<br>0.0 0.33 0.67 1.00 1.33 1.66 2.00 0.0 0.20 0.40 0.60 0.80 1.00 1.20 1.40 0.0 0.20 0.40 0.60 0.80 1.00<br>IDC (A) IDC (A) IDC (A)<br>How to Order Electrical Schematic<br>SRR0745A  -  100M<br>Model<br>Value Code (see table)<br>T (°C) T (°C) T (°C)<br>Δ Δ Δ<br>**----- End of picture text -----**<br>


Specifications are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications. 

## **SRR0745A Series - Shielded Power Inductors3312 - 2 mm SMD Trimming Potentiometer** 

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**----- Start of picture text -----**<br>
Soldering Profle<br>Peak Temperature : 250  °C  max.<br>Max. Peak Temperature -5  °C: 30 sec. max.<br>Max. Time Above 217  °c :  60~150 sec. max.<br>Temperature Preheat Reflow Forced<br>Rising Area Area Area Cooling Area<br>+4.0 °C/Sec. Max. 150~200 °C / 60~120 Sec. +3.0 °C/Sec. Max. -(1.0~5.0) °C/Sec. Max.<br>Peak Temperature: 250 °C<br>250<br>l<br>217 °C<br>200 60~150 Sec.<br>}—<br>60 Sec.<br>Max.<br>150<br>60~120 Sec.<br>100 “fo<br>50<br>0 50 100 150 200 250<br>Time (Seconds)<br>Packaging Specifcations<br>330 2.0 ± 0.5 22.4<br>(12.99) — [DIA.] ar (.079 ± .020) —r (.882) ir THICKNESS<br>21.0 ± 0.8 13.0 ± 0.5 MAX.<br>(.827 ± .031) (.512 ± .020)DIA.<br>—_— \\ in /”<br>| 0.10<br>t(4)aas/ ]~8-a 4 |— (1.97 -0)50.0 -0 84° NSS&S .<br>13.0 ± 0.5<br>(.512 ± .020) [DIA.]<br>— " \ 7 y)<br>16.0<br>18 +0<br>(.709 +0) (.630)<br>12.0 4.0<br>END Poa (.472) re (.157) START<br>[ololololo<br>NO COMPONENT COMPONENTS NO COMPONENT<br>200 400<br>(7.87) (15.75)<br>USER DIRECTION OF FEED<br>OO<br>QTY: 1000 PCS. PER REEL<br>MM<br>DIMENSIONS:<br>(INCHES)<br>Temperature (°C)<br>**----- End of picture text -----**<br>


REV. 02/17 Specifications are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications. 



## Links

- [View this product on Novapart](https://novapart.co/products/SRR0745A-271M/power-inductor-smd-270-h-380-ma-shielded-460)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/en-ES/bourns/srr0745a-271m/inductor-270uh-20-0-38a-shielded/dp/2455056)
---

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