MF-USML400/12-2

## **Features** 

n Surface mount packaging for automated assembly n Small footprint size (1210) and low profile for space-constrained mobile applications n Ultra-low resistance, quick response n RoHS compliant* n Agency recognition: 

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|---|---|---|---|---|---|---|---|---|---|---|---|
|MF-USML/X Series - Low Ohmic PTC Resettable Fuses|
|POURNS|ii|
|Electrical Characteristics|
|Tripped|
|Ihold|Itrip|Resistance|Max. Time To Trip|Power|Certifications|
|V max.|I max.|Dissipation|
|Model|
|Watts at|
|at 23 °C|at 23 °C Ohms|at 23 °C|cUL|TÜV|
|23 °C|
|EE|Volts|Amps|Amps|Rmin|R1max|Amps|Seconds|Typ.|E174545|R50391579|
|MF-USML175/12|12|50|1.75|3.5|0.006|0.050|8.0|0.8|1.0|3|3|
|PO|
|MF-USML200/12|12|50|2.0|4.0|0.005|0.040|8.0|5.0|1.0|3|3|
|es ns|DG|SG|OO|
|MF-USML260/12|12|50|2.6|5.2|0.004|0.030|8.0|5.0|1.0|3|3|
|a|sDGD|OO|
|MF-USML300/12|12|50|3.0|6.0|0.003|0.024|15.0|5.0|1.0|3|3|
|GG|
|MF-USML350/12|12|50|3.5|7.0|0.002|0.022|17.0|5.0|1.0|3|3|
|es|GO|
|MF-USML380/12|12|50|3.8|7.6|0.002|0.020|19.0|5.0|1.0|3|3|
|GG|GO|
|es|GG|OO|
|MF-USML400/12|12|50|4.0|8.0|0.002|0.018|20.0|5.0|1.0|3|3|
|ss|
|MF-USML450/12|12|50|4.5|9.0|0.002|0.014|22.5|2.0|1.0|3|3|
|es|OSG|(OO|
|MF-USML500/12|12|50|5.0|10.0|0.001|0.012|25.0|2.0|1.2|3|3|
|a|nssDDG|SG|OO|
|MF-USML550/12|12|50|5.5|11.0|0.001|0.010|27.5|2.0|1.2|3|3|
|Po|GD|OO|

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## ~~**Environmental Characteristics**~~ 

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|||
|---|---|
|Operating Temperature ......................................... -40 °C to +85 °C|
|Storage Condition|
|Before Opening ............................................... +40 °C max. / 70 % RH max.|
|After Opening................................................... +40 °C max. / 10 % RH max.|
|Floor Condition After Opening .............................. Consumption within 4 weeks at floor condition +30 °C max. / 60 % RH max.|
|Passive Aging ....................................................... +85 °C, 1000 hours ............................................... ±10 % typical resistance change|
|Humidity Aging...................................................... +85 °C, 85 % R.H. 100 hours ............................... ±15 % typical resistance change|
|Thermal Shock ..................................................... +85 °C to -40 °C, 20 times .................................... ±30 % typical resistance change|
|Solvent Resistance ............................................... MIL-STD-202, Method 215 ................................... No change (marking still legible)|
|Vibration ............................................................... MIL-STD-883C, Method 2007.1, ........................... No change (Rmin<R<R1max)|
|Condition A|
|Moisture Sensitivity Level (MSL) ..........................|See Note|
|ESD Classification - HBM ..................................... 6|

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## ~~**Test Procedures and Requirements**~~ 

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||||
|---|---|---|
|Test|Test Conditions|Accept/Reject Criteria|
|Visual/Mech. ......................................................... Verify dimensions and materials ........................... Per MF physical description|
|Resistance ............................................................ In still air @ 23 °C ................................................. Rmin|≤ R ≤ R1max|
|Time to Trip ........................................................... At specified current, Vmax, 23 °C .......................... T ≤ max. time to trip (seconds)|
|Hold Current ......................................................... 30 min. at Ihold ...................................................... No trip|
|Trip Cycle Life ....................................................... Vmax, Imax, 100 cycles.......................................... No arcing or burning|
|Trip Endurance ..................................................... Vmax, 48 hours ..................................................... No arcing or burning|
|Solderability .......................................................... 245 °C ±5 °C, 5 seconds ...................................... 95 % min. coverage|

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**WARNING  Cancer and Reproductive Harm -** www.P65Warnings.ca.gov 

> *   RoHS Directive 2015/863, Mar 31, 2015 and Annex. 

- ** 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. 

Users should verify actual device performance in their specific applications. 

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 

## **Applications** 

n Li-ion battery pack protection n Power delivery port protection 

n Higher voltage withstand 

n PC motherboards – Plug & Play protection 

n Mobile phones – battery & charging protection n USB port protection n Game console port protection 

## **MF-USML/X Series – Low Ohmic PTC Resettable Fuses MF-NSMF Series - PTC Resettable Fuses** 

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

|**Model**||**A**|**A**|||**B**|**B**|||**C**|**C**|||**D**||**E**|**E**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|||Min.||Max.||Min.||Max.||Min.||Max.||Min.||Min.|Max.|
|MF-USML175/12||3.00<br>(0.12)||3.43<br>(0.14)||2.35<br>(0.09)||2.80<br>(0.11)||0.40<br>(0.016)||0.80<br>(0.031)||0.25<br>(0.010)||0.05<br>(0.002)|0.45<br>(0.018)|
|MF-USML200/12||||||||||||||||||
|MF-USML260/12||||||||||||||||||
|MF-USML300/12||3.00<br>(0.12)||3.43<br>(0.14)||2.35<br>(0.09)||2.80<br>(0.11)||0.60<br>(0.024)||1.20<br>(0.047)||0.25<br>(0.010)||0.05<br>(0.002)|0.45<br>(0.018)|
|MF-USML350/12||||||||||||||||||
|MF-USML380/12||||||||||||||||||
|MF-USML400/12||||||||||||||||||
|MF-USML450/12||||||||||||||||||
|MF-USML500/12||||||||||||||||||
|MF-USML550/12||||||||||||||||||



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DIMENSIONS: 

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(INCHES)<br>Top View Side View Bottom View Terminal material:  Recommended Pad Layout<br>A C D E ENIG-plated terminals<br>1.0 ± 0.05 1.0 ± 0.05<br>(.039 ± .002) (.039 ± .002)<br>B 2.5 ± 0.1<br>(.098  ± .004)<br>2.0 ± 0.1<br>(.079 ± .004)<br>**----- End of picture text -----**<br>


## ~~**Packaging Quantity**~~ 

MF-USML175/12 ~ MF-USML260/12 = 5000 pcs. per reel MF-USML300/12 ~ MF-USML550/12 = 3500 pcs. per reel 

## ~~**Thermal Derating Table - Ihold (Amps)**~~ 

|**Model**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|**Ambient Operating Temperature**|
|---|---|---|---|---|---|---|---|---|---|
||**-40 °C**|**-20 °C**|**0 °C**|**23 °C**|**40 °C**|**50 °C**|**60 °C**|**70 °C**|**85 °C**|
|MF-USML175/12|2.57|2.33|2.07|1.75|1.49|1.34|1.24|1.00|0.88|
|MF-USML200/12|2.94|2.65|2.35|2.00|1.70|1.53|1.42|1.14|1.00|
|MF-USML260/12|3.82|3.46|3.07|2.60|2.21|1.95|1.85|1.48|1.30|
|MF-USML300/12|4.41|3.99|3.54|3.00|2.55|2.30|2.13|1.71|1.50|
|MF-USML350/12|5.10|4.65|4.13|3.50|2.98|2.65|2.50|2.00|1.75|
|MF-USML380/12|5.59|5.05|4.48|3.80|3.23|2.95|2.70|2.17|1.90|
|MF-USML400/12|5.80|5.25|4.70|4.00|3.40|3.10|2.80|2.28|2.00|
|MF-USML450/12|6.30|5.65|4.95|4.50|3.83|3.40|2.95|2.50|2.05|
|MF-USML500/12|7.00|6.25|5.50|5.00|4.25|3.75|3.25|2.75|2.25|
|MF-USML550/12|7.70|6.90|6.05|5.50|4.68|4.15|3.60|3.05|2.40|



Specifications are subject to change without notice. 

Users should verify actual device performance in their specific applications. 

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 

## **3312 - 2 mm SMD Trimming PotentiometerMF-USML/X Series – Low Ohmic PTC Resettable Fuses** 

## ~~**Solder Refow Recommendations**~~ 

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tp<br>TP CRITICAL ZONE<br>RAMP-UP TL TO TP<br>TL<br>t L<br>Ts max<br>RAMP-DOWN<br>Ts min<br>ts<br>PREHEAT<br>25<br>t  25 °C TO PEAK<br>Temperature<br>**----- End of picture text -----**<br>


## **Notes:** 

- MF-USML/X models cannot be wave soldered or hand soldered. Please contact Bourns for soldering recommendations. 

- All temperatures refer to topside of the package, measured on the package body surface. 

- If reflow temperatures exceed the recommended profile, devices may not meet the published specifications. 

- Compatible with Pb and Pb-free solder reflow profiles. 

- Excess solder may cause a short circuit. Please refer to the Multifuse[® ] Polymer PTC Soldering Recommendation guidelines. 

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|**Time**||
|---|---|
|**Profle Feature**|**Pb-Free Assembly**|
|Average Ramp-Up Rate (Tsmaxto Tp)|3 °C / second max.|
|PREHEAT:<br>Temperature Min. (Tsmin)<br>Temperature Max. (Tsmax)<br>Time (Tsminto Tsmax) (ts)|150 °C<br>200 °C<br>60~180 seconds|
|<br>TIME MAINTAINED ABOVE:<br>Temperature (TL)<br>Time (tL)|217 °C<br>60~150 seconds|
|Peak Temperature (Tp)|260 °C|
|Time within 5 °C of Actual Peak Temperature (tp)|20~40 seconds|
|Ramp-Down Rate|6 °C / second max.|
|Time 25 °C to Peak Temperature|8 minutes max.|



## ~~**How to Order**~~ 

## ~~**Typical Part Marking**~~ 

**MF - USML 400 / 12 - 2** Represents total content. Layout may vary. Multifuse[[®]] PART IDENTIFICATION: Product Designator MF-USML175/12 = H12 MF-USML200/12 = J12 Series MF-USML260/12 = N12 USML = 1210 Low Ohmic MF-USML300/12 = P12 Surface Mount Component **U12** MF-USML350/12 = S12 MF-USML380/12 = V12 Hold Current, Ihold MF-USML400/12 = U12 175 - 550 (1.75 Amps - 5.50 Amps) MF-USML450/12 = X12 MF-USML500/12 = Y12 Maximum Voltage, Vmax MF-USML550/12 = 512 12 = 12 Volts Packaging MANUFACTURING DATE CODE IS LOCATED ON PACKING LABEL. 

Multifuse[[®]] Product Designator 

- Packaging -2 =  Tape and Reel Packaged per EIA 481 

MF-USML/X SERIES, REV. A, 03/19 

Specifications are subject to change without notice. 

Users should verify actual device performance in their specific applications. 

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 

## **MF-USML/X Series – Low Ohmic PTC Resettable Fuses MF-NSMF Series - PTC Resettable Fuses** 

## ~~**Packaging Specifcations**~~ 

MF-USML/X Series per EIA 481 

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0.6 1.50 +0.1 / -0 4.0 ± 0.10 2.0 ± 0.05 1.75 ± 0.10<br>(.024)  [MAX.] (.059 +.004 / -0) [DIA.] (.157 ± .004) (.079 ± .002) (.069 ± .004)<br>5.50 ± 0.05<br>12.0 ± 0.30 (.216 ± .002)<br>(.472 ± .012)<br>4.5<br>(.177)  [MAX.] COVER<br>TAPE<br>3.50 ± 0.10<br>(.138 ± .004)<br>K0<br>0.1 4.0 ± 0.10 2.90 ± 0.10 10.25<br>TYP.<br>(.004)  [MAX.] (.157 ± .004) (.114 ± .004) (.404)<br>LEADER MIN. TRAILER MIN.<br>390 160<br>(15.35) (6.30)<br>K0<br>0.65 ± 0.10<br>MF-USML175/12 ~ MF-USML260/12<br>(.026 ± .004)<br>1.10 ± 0.10<br>MF-USML300/12 ~ MF-USML550/12<br>(.043 ± .004)<br>**----- End of picture text -----**<br>


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185 15.4*<br>MAX. MAX.<br>(7.283) (.606)<br>50 MIN.<br>(1.97) HUB DIA.<br>12.4 +1 / -0*<br>(.488 +.039 / -0)<br>MM<br>*MEASURED AT HUB DIMENSIONS:<br>(INCHES)<br>**----- End of picture text -----**<br>


**Asia-Pacific:** Tel: +886-2 2562-4117 • Email: asiacus@bourns.com **EMEA:** Tel: +36 88 885 877 • Email: eurocus@bourns.com **The Americas:** Tel: +1-951 781-5500 • Email: americus@bourns.com **www.bourns.com** 

Specifications are subject to change without notice. 

Users should verify actual device performance in their specific applications. 

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 

## **Legal Disclaimer Notice** 

This legal disclaimer applies to purchasers and users of Bourns[®] products manufactured by or on behalf of Bourns, Inc. and its affiliates (collectively, “Bourns”). 

Unless otherwise expressly indicated in writing, Bourns[®] products and data sheets relating thereto are subject to change without notice.  Users should check for and obtain the latest relevant information and verify that such information is current and complete before placing orders for Bourns[®] products. 

The characteristics and parameters of a Bourns[®] product set forth in its data sheet are based on laboratory conditions, and statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical requirements in generic applications.  The characteristics and parameters of a Bourns[®] product in a user application may vary from the data sheet characteristics and parameters due to (i) the combination of the Bourns[®] product with other components in the user’s application, or (ii) the environment of the user application itself.  The characteristics and parameters of a Bourns[®] product also can and do vary in different applications and actual performance may vary over time.  Users should always verify the actual performance of the Bourns[®] product in their specific devices and applications, and make their own independent judgments regarding the amount of additional test margin to design into their device or application to compensate for differences between laboratory and real world conditions. 

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C1753 05/17/18R