MSS1278T-105KLB

Power Inductor (SMD), 1 mH, 680 mA, Shielded, 982 mA, MSS1278T Series

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Manufacturer: COILCRAFT
Product type: SMD Power Inductors
Inductance:1mH; RMS Current (Irms):680mA; Inductor Construction:Shielded; Saturation Current (Isat):982mA; Product Range:-; Power Inductor Case:12mm x 12mm x 7.8mm; DC Resistance Max
Inductance: 1mH
Product Range: MSS1278T Series
Product Width: 12mm
Product Height: 7.8mm
Product Length: 12mm
DC Resistance Max: 1.482ohm
RMS Current (Irms): 680mA
Power Inductor Case: 12mm x 12mm x 7.8mm
Inductance Tolerance: ± 10%
Inductor Construction: Shielded
Saturation Current (Isat): 982mA

Delivery and price
Units per pack	100
Price	1.25 €
Current stock	10+
Lead time	30 days

Datasheet

Document 598-1 

## 

## **SMT Power Inductors – MSS1278T** 

- Designed for high ambient temperatures 

- Very low DCR, excellent current handling 

- Magnetic shielding for high density mounting 

**Designer’s Kit C419** contains 3 of each value 

**Core material** Ferrite 

**Terminations** RoHS compliant matte tin over nickel over phos bronze. Other terminations available at additional cost. **Weight:** 3.8 g – 4.6 g 

**Ambient temperature** –40°C to +125°C with I rms current, +125°C to +165°C with derated current 

**Storage temperature** Component: –40°C to +165°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) 

**Failures in Time (FIT) / Mean Time Between Failures (MTBF)** 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 **Packaging** 500/13″ reel; Plastic tape: 24 mm wide, 0.4 mm thick, 16 mm  pocket spacing, 8.1 mm pocket depth 

**PCB washing** Only pure water or alcohol recommended 

|**DCR**3 <br> **Inductance**2  **(mOhms)**<br>  **Part number**1<br>**(µH)**<br>**typ**<br>**max**<br>MSS1278T-102NL_    1.0 ±30%<br>6.3<br>7.0 115<br>MSS1278T-142NL_    1.4 ±30%<br>8.8<br>9.8<br>MSS1278T-222NL_    2.2 ±30%<br>9.4<br>10.5<br>MSS1278T-272NL_    2.7 ±30%<br>10.1<br>11.3<br>MSS1278T-392NL_3.9 ±30%<br>11.7<br>13.0|**DCR**3 <br> **Inductance**2  **(mOhms)**<br>  **Part number**1<br>**(µH)**<br>**typ**<br>**max**<br>MSS1278T-102NL_    1.0 ±30%<br>6.3<br>7.0 115<br>MSS1278T-142NL_    1.4 ±30%<br>8.8<br>9.8<br>MSS1278T-222NL_    2.2 ±30%<br>9.4<br>10.5<br>MSS1278T-272NL_    2.7 ±30%<br>10.1<br>11.3<br>MSS1278T-392NL_3.9 ±30%<br>11.7<br>13.0|**DCR**3 <br> **Inductance**2  **(mOhms)**<br>  **Part number**1<br>**(µH)**<br>**typ**<br>**max**<br>MSS1278T-102NL_    1.0 ±30%<br>6.3<br>7.0 115<br>MSS1278T-142NL_    1.4 ±30%<br>8.8<br>9.8<br>MSS1278T-222NL_    2.2 ±30%<br>9.4<br>10.5<br>MSS1278T-272NL_    2.7 ±30%<br>10.1<br>11.3<br>MSS1278T-392NL_3.9 ±30%<br>11.7<br>13.0|**DCR**3 <br> **Inductance**2  **(mOhms)**<br>  **Part number**1<br>**(µH)**<br>**typ**<br>**max**<br>MSS1278T-102NL_    1.0 ±30%<br>6.3<br>7.0 115<br>MSS1278T-142NL_    1.4 ±30%<br>8.8<br>9.8<br>MSS1278T-222NL_    2.2 ±30%<br>9.4<br>10.5<br>MSS1278T-272NL_    2.7 ±30%<br>10.1<br>11.3<br>MSS1278T-392NL_3.9 ±30%<br>11.7<br>13.0|**SRF**<br> **typ**4<br>**(MHz) dro**<br>7.0 115<br>85<br>60<br>40<br>35|**Isat(A)**5<br>**Irms(A)**6<br>**10%**<br>**20%**<br>**30% 20°C 40°C**<br>**drop drop**<br>**drop**<br>**rise rise**<br>31.84 35.04 36.84<br>7.1 10.1<br>25.04 27.76 29.52<br>6.8<br>9.8<br>22.56 24.80 25.96<br>6.3<br>9.2<br>18.76 20.72 22.04<br>6.1<br>8.6<br>16.52 18.24 19.20<br>5.7<br>7.7|**Isat(A)**5<br>**Irms(A)**6<br>**10%**<br>**20%**<br>**30% 20°C 40°C**<br>**drop drop**<br>**drop**<br>**rise rise**<br>31.84 35.04 36.84<br>7.1 10.1<br>25.04 27.76 29.52<br>6.8<br>9.8<br>22.56 24.80 25.96<br>6.3<br>9.2<br>18.76 20.72 22.04<br>6.1<br>8.6<br>16.52 18.24 19.20<br>5.7<br>7.7|**Isat(A)**5<br>**Irms(A)**6<br>**10%**<br>**20%**<br>**30% 20°C 40°C**<br>**drop drop**<br>**drop**<br>**rise rise**<br>31.84 35.04 36.84<br>7.1 10.1<br>25.04 27.76 29.52<br>6.8<br>9.8<br>22.56 24.80 25.96<br>6.3<br>9.2<br>18.76 20.72 22.04<br>6.1<br>8.6<br>16.52 18.24 19.20<br>5.7<br>7.7|**Isat(A)**5<br>**Irms(A)**6<br>**10%**<br>**20%**<br>**30% 20°C 40°C**<br>**drop drop**<br>**drop**<br>**rise rise**<br>31.84 35.04 36.84<br>7.1 10.1<br>25.04 27.76 29.52<br>6.8<br>9.8<br>22.56 24.80 25.96<br>6.3<br>9.2<br>18.76 20.72 22.04<br>6.1<br>8.6<br>16.52 18.24 19.20<br>5.7<br>7.7|1. Please specify**termination**and**packaging**codes:<br>**MSS1278T-105KLD**<br>**Termination: L**=RoHS compliant matte tin over<br>nickel over phos bronze.<br>**Special order:**<br>**T**= RoHS tin-silver-copper<br>(95.5/4/0.5) or**S**= non-RoHS<br>tin-lead (63/37).|1. Please specify**termination**and**packaging**codes:<br>**MSS1278T-105KLD**<br>**Termination: L**=RoHS compliant matte tin over<br>nickel over phos bronze.<br>**Special order:**<br>**T**= RoHS tin-silver-copper<br>(95.5/4/0.5) or**S**= non-RoHS<br>tin-lead (63/37).|1. Please specify**termination**and**packaging**codes:<br>**MSS1278T-105KLD**<br>**Termination: L**=RoHS compliant matte tin over<br>nickel over phos bronze.<br>**Special order:**<br>**T**= RoHS tin-silver-copper<br>(95.5/4/0.5) or**S**= non-RoHS<br>tin-lead (63/37).|1. Please specify**termination**and**packaging**codes:<br>**MSS1278T-105KLD**<br>**Termination: L**=RoHS compliant matte tin over<br>nickel over phos bronze.<br>**Special order:**<br>**T**= RoHS tin-silver-copper<br>(95.5/4/0.5) or**S**= non-RoHS<br>tin-lead (63/37).|1. Please specify**termination**and**packaging**codes:<br>**MSS1278T-105KLD**<br>**Termination: L**=RoHS compliant matte tin over<br>nickel over phos bronze.<br>**Special order:**<br>**T**= RoHS tin-silver-copper<br>(95.5/4/0.5) or**S**= non-RoHS<br>tin-lead (63/37).|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|MSS1278T-472ML_   4.7 ±20%|MSS1278T-472ML_   4.7 ±20%|MSS1278T-472ML_   4.7 ±20%<br>13.9|13.9<br>15.5|33|15.30 16.90 17.76|15.30 16.90 17.76|4.3|6.2|**Packaging: D**= 13″ machine-ready reel. EIA-481|||||
|MSS1278T-562ML_   5.6 ±20%|MSS1278T-562ML_   5.6 ±20%|MSS1278T-562ML_   5.6 ±20%<br>15.7|15.7<br>17.5|30|13.38 14.86 15.74|13.38 14.86 15.74|4.3|6.2|embossed plastic tape (500 parts||embossed plastic tape (500 parts|||
|MSS1278T-682ML_   6.8 ±20%|MSS1278T-682ML_   6.8 ±20%|MSS1278T-682ML_   6.8 ±20%<br>19.1|19.1<br>21.3|23|12.10 13.56 14.20|12.10 13.56 14.20|4.2|6.0|per full reel).|||||
|MSS1278T-822ML_   8.2 ±20%|MSS1278T-822ML_   8.2 ±20%|MSS1278T-822ML_   8.2 ±20%<br>20.3|20.3<br>22.6|20|11.38 12.60 13.28|11.38 12.60 13.28|4.1|5.9|**B**= Less than full reel. In tape, but||= Less than full reel. In tape, but|||
|MSS1278T-103ML_10 ±20%|10 ±20%|21.8|21.8<br>24.3|17|10.62 11.82 12.48|10.62 11.82 12.48|4.0|5.7|not machine ready.||||not machine ready.|
|MSS1278T-123ML_  12 ±20%<br>MSS1278T-153ML_  15 ±20%<br>MSS1278T-183ML_  18 ±20%<br>MSS1278T-223ML_  22 ±20%<br>MSS1278T-273ML_27 ±20%<br>MSS1278T-333ML_  33 ±20%<br>MSS1278T-393ML_  39 ±20%<br>MSS1278T-473ML_  47 ±20%<br>MSS1278T-563ML_  56 ±20%<br>MSS1278T-683ML_68 ±20%<br>MSS1278T-823ML_  82 ±20%<br>MSS1278T-104ML_ 100 ±20%|MSS1278T-123ML_  12 ±20%<br>MSS1278T-153ML_  15 ±20%<br>MSS1278T-183ML_  18 ±20%<br>MSS1278T-223ML_  22 ±20%<br>27 ±20%<br>MSS1278T-333ML_  33 ±20%<br>MSS1278T-393ML_  39 ±20%<br>MSS1278T-473ML_  47 ±20%<br>MSS1278T-563ML_  56 ±20%<br>68 ±20%<br>MSS1278T-823ML_  82 ±20%<br>MSS1278T-104ML_ 100 ±20%|23.2<br>27.9<br>30.8<br>35.5<br>45.0<br>61.9<br>69.1<br>72.3<br>80.2<br>91.3 101.5<br>125.9 139.9<br>135.1 150.2|23.2<br>25.8<br>27.9<br>31.0<br>30.8<br>34.3<br>35.5<br>39.5<br>45.0<br>50.0<br>61.9<br>68.8<br>69.1<br>76.8<br>72.3<br>80.4<br>80.2<br>89.2<br>91.3 101.5<br>125.9 139.9<br>135.1 150.2|15<br>13<br>12<br>11<br>10<br>9.5<br>8.5<br>7.5<br>7.0<br>6.5<br>5.0<br>4.5|8.90<br>8.36<br>8.00<br>7.08<br>6.32<br>5.96<br>5.38<br>4.76<br>4.40<br>3.92<br>3.66<br>3.12|8.90<br>9.88 10.44<br>8.36<br>9.32<br>9.94<br>8.00<br>8.88<br>9.36<br>7.08<br>7.88<br>8.34<br>6.32<br>7.08<br>7.54<br>5.96<br>6.56<br>6.98<br>5.38<br>5.94<br>6.28<br>4.76<br>5.40<br>5.66<br>4.40<br>4.98<br>5.30<br>3.92<br>4.46<br>4.74<br>3.66<br>4.08<br>4.38<br>3.12<br>3.56<br>3.78|3.7<br>3.5<br>3.0<br>2.9<br>2.6<br>2.3<br>2.1<br>2.0<br>1.9<br>1.8<br>1.6<br>1.5|5.2<br>4.9<br>4.5<br>4.0<br>3.6<br>3.1<br>3.0<br>2.9<br>2.7<br>2.6<br>2.3<br>2.2|To have a leader and trailer<br>added ($25 charge), use code<br>letter D instead.<br>2. Inductance tested at 100 kHz, 0.1 Vrms, 0 Adc using<br>an Agilent/HP 4263B LCR meter or equivalent.<br>3. DCR measured on a micro-ohmmeter and a<br>Coilcraft CCF858 test fixture.<br>4. SRF measured using an Agilent/HP 8753D net-<br>work analyzer and a Coilcraft SMD -D test fixture.<br>5. DC current at which the inductance drops the<br>specified amount from its value without current.<br>6. Current that causes the specified temperature rise<br>from 25°C ambient.|||||
|MSS1278T-124KL_  120 ±10%<br>MSS1278T-154KL_  150 ±10%<br>MSS1278T-184KL_180 ±10%<br>MSS1278T-224KL_  220 ±10%|MSS1278T-124KL_  120 ±10%<br>MSS1278T-154KL_  150 ±10%<br>180 ±10%<br>MSS1278T-224KL_  220 ±10%|182.3 202.6<br>216.5 240.6<br>229.0 254.5<br>323.6 359.6|182.3 202.6<br>216.5 240.6<br>229.0 254.5<br>323.6 359.6|4.3<br>4.1<br>4.0<br>3.4|3.02<br>2.60<br>2.36<br>2.24|3.02<br>3.36<br>3.58<br>2.60<br>2.94<br>3.10<br>2.36<br>2.68<br>2.84<br>2.24<br>2.50<br>2.62|1.4<br>1.3<br>1.2<br>1.0|1.9<br>1.8<br>1.7<br>1.6|7. Electrical specifications at 25°C.<br>Refer to Doc 362 “Soldering Surface Mount Compo-<br>nents” before soldering.|||||
|MSS1278T-274KL_  270 ±10%|MSS1278T-274KL_  270 ±10%|415.6 461.8|415.6 461.8|3.1|1.94|1.94<br>2.18<br>2.34|0.90 1.2|0.90 1.2||||||
|MSS1278T-334KL_  330 ±10%|MSS1278T-334KL_  330 ±10%|487.3 541.5|487.3 541.5|2.9|1.72|1.72<br>1.92<br>2.06|0.80 1.0|0.80 1.0||||||
|MSS1278T-394KL_  390 ±10%|MSS1278T-394KL_  390 ±10%|533.6 592.9|533.6 592.9|2.7|1.62|1.62<br>1.82<br>1.92|0.75 1.0|0.75 1.0||||||
|MSS1278T-474KL_470 ±10%|470 ±10%|707.5 786.2|707.5 786.2|2.2|1.44|1.44<br>1.64<br>1.74|0.66 0.90|0.66 0.90||||||
|MSS1278T-564KL_  560 ±10%|MSS1278T-564KL_  560 ±10%|777.4 863.8|777.4 863.8|2.0|1.40|1.40<br>1.54<br>1.66|0.60 0.80|0.60 0.80||||||
|MSS1278T-684KL_  680 ±10% 1045|MSS1278T-684KL_  680 ±10% 1045|MSS1278T-684KL_  680 ±10% 1045|1162|1.7|1.24|1.24<br>1.32<br>1.46|0.55 0.75|0.55 0.75||||||
|MSS1278T-824KL_  820 ±10% 1166|MSS1278T-824KL_  820 ±10% 1166|MSS1278T-824KL_  820 ±10% 1166|1296|1.4|1.14|1.14<br>1.28<br>1.42|0.50 0.70|0.50 0.70||||||
|MSS1278T-105KL_ 1000 ±10% 1334|MSS1278T-105KL_ 1000 ±10% 1334|MSS1278T-105KL_ 1000 ±10% 1334|1482|1.3|0.982 1.08<br>1.18||0.48 0.68|0.48 0.68||||||



- **Packaging: D** = 13″ machine-ready reel. EIA-481 embossed plastic tape (500 parts per full reel). 

2. Inductance tested at 100 kHz, 0.1 Vrms, 0 Adc using an Agilent/HP 4263B LCR meter or equivalent. 

6. Current that causes the specified temperature rise from 25°C ambient. 

Document 598-1 Revised 08/18/11 

Document 598-2 

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## 

## **SMT Power Inductors – MSS1278T Series** 

## **Typical L vs Frequency** 

## **Typical L vs Current** 

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10000<br>1000 µH<br>1000<br>100 µH<br>100<br>10 µH<br>10<br>1 µH<br>1<br>0.1<br>0.01 0.1 1 10<br>Frequency (MHz)<br>Inductance (µH)<br>**----- End of picture text -----**<br>


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**----- Start of picture text -----**<br>
10000<br>1000 µH<br>1000<br>100 µH<br>100<br>10 µH<br>10<br>1 µH<br>1<br>0.1<br>0.1 1 10 100<br>Current (A)<br>Inductance (µH)<br>**----- End of picture text -----**<br>


## **Current Derating** 

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**----- Start of picture text -----**<br>
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<br>Irms<br>0<br>-40 -20 0 20 40 60 80 100 120 140 160 180<br>Ambient temperature (°C)<br>Percent of rated Current 25°C<br>**----- End of picture text -----**<br>


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Dimensions are in[inches ] mm 

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Document 598-2 Revised 08/18/11 

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Updated at March 10, 2026

Coilcraft is a globally recognized leader in the design and manufacture of high-performance magnetic components. Renowned for its engineering excellence, reliable delivery, and stringent quality standards, the company provides essential solutions for a wide array of demanding applications, including signal processing, RF, power management, and timing circuits. Our comprehensive portfolio of Coilcraft components is centered on their industry-leading inductor technologies. This encompasses a vast selection of high-efficiency power inductors designed to optimize modern power supply architectures, alongside precision RF inductors engineered to deliver exceptional stability and performance in high-frequency communications and wireless applications. To support complete electromagnetic compatibility and comprehensive circuit design, we also offer a variety of Coilcraft's specialized magnetic solutions. This includes robust common mode chokes and filters for effective EMC and RFI suppression, current sensing transformers, and a selection of inductor kits and assortments that provide design engineers with versatile options for rapid prototyping and development.

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