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
n RoHS compliant* and halogen free**
n Agency recognition:
Applications
n Thermal protection for Li-ion and polymer
battery packs
n Game consoles
n PC motherboards
n USB port protection - USB 2.0, 3.0 & OTG
n Mobile phones
n Digital cameras
MF-USML Series - Low Ohmic PTC Resettable Fuses
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
**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.
Electrical Characteristics
Model V max.
Volts
I max.
Amps
Ihold Itrip Resistance Max. Time
To Trip
Tripped
Power
Dissipation
Amperes
at 23 °C
Ohms
at 23 °C
Amperes
at 23 °C
Seconds
at 23 °C
Watts
at 23 °C
Hold Trip RMin. R1Max. Typ.
MF-USML175 6 50 1.75 3.50 0.0060 0.0400 8.00 2.50 0.8
MF-USML190 6 50 1.90 4.90 0.0060 0.0300 9.50 3.00 0.8
MF-USML200 6 50 2.00 4.00 0.0050 0.0300 8.00 3.00 0.8
MF-USML230 6 50 2.30 4.60 0.0045 0.0240 8.00 3.50 0.8
MF-USML250 6 50 2.50 5.00 0.0045 0.0220 8.00 3.50 0.8
MF-USML270 6 50 2.70 5.40 0.0040 0.0200 8.00 4.00 0.8
MF-USML300 6 50 3.00 6.00 0.0040 0.0180 8.00 4.00 0.8
MF-USML350 6 50 3.50 7.00 0.0030 0.0180 17.50 2.00 0.8
MF-USML380 6 50 3.80 8.00 0.0020 0.0160 19.00 2.00 0.8
MF-USML400 6 50 4.00 8.00 0.0015 0.0155 20.00 2.00 0.8
MF-USML450 6 50 4.50 9.00 0.0010 0.0150 22.50 2.00 0.8
MF-USML500 6 50 5.00 10.00 0.0010 0.0145 25.00 2.00 0.8
MF-USML600 6 50 6.00 12.00 0.0010 0.0140 30.00 2.00 0.8
MF-USML650 6 50 6.50 13.00 0.0010 0.0140 32.50 2.00 0.8
MF-USML700 6 50 7.00 14.00 0.0010 0.0135 35.00 2.00 0.8
Environmental Characteristics
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
Vibration ............................................................... MIL-STD-883C, Method 2007.1, ........................... No change
Condition A
Moisture Sensitivity Level (MSL) .......................... See Note
ESD Classication - HBM ..................................... Class 6
Test Procedures And Requirements
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 specied 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
UL File Number .................................................... E174545
TÜV Certicate Number ....................................... R 50302873
WARNING Cancer and Reproductive Harm
www.P65Warnings.ca.gov
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 Series - Low Ohmic PTC Resettable Fuses
Product Dimensions
DIMENSIONS: MM
(INCHES)
Model A B C D E
Min. Max. Min. Max. Min. Max. Min. Min. Max.
MF-USML175
3.00
(0.118)
3.43
(0.135)
2.35
(0.093)
2.80
(0.110)
0.30
(0.012)
0.60
(0.024)
0.25
(0.010)
0.05
(0.002)
0.45
(0.018)
MF-USML190
MF-USML200
MF-USML230
MF-USML250
MF-USML270
MF-USML300
MF-USML350
MF-USML380
MF-USML400
MF-USML450
3.00
(0.118)
3.43
(0.135)
2.35
(0.093)
2.80
(0.110)
0.60
(0.024)
1.20
(0.047)
0.25
(0.010)
0.05
(0.002)
0.45
(0.018)
MF-USML500
MF-USML600
MF-USML650
MF-USML700
MF-USML175~MF-USML400 = 5000 pcs. per reel
MF-USML450~MF-USML700 = 3500 pcs. per reel
Terminal material:
ENIG-plated terminals
Thermal Derating Table - Ihold (Amps)
Model
Ambient Operating Temperature
-40 °C -20 °C 0 °C 23 °C 40 °C 50 °C 60 °C 70 °C 85 °C
MF-USML175 2.57 2.33 2.07 1.75 1.49 1.34 1.24 1.00 0.88
MF-USML190 2.80 2.55 2.25 1.90 1.60 1.46 1.35 1.09 0.95
MF-USML200 2.94 2.65 2.35 2.00 1.70 1.53 1.42 1.14 1.00
MF-USML230 3.40 3.17 2.74 2.30 1.94 1.72 1.60 1.30 1.15
MF-USML250 3.70 3.35 2.95 2.50 2.10 1.90 1.75 1.40 1.25
MF-USML270 3.98 3.60 3.18 2.70 2.28 2.03 1.90 1.52 1.35
MF-USML300 4.41 3.99 3.54 3.00 2.55 2.30 2.13 1.71 1.50
MF-USML350 5.10 4.65 4.13 3.50 2.98 2.65 2.50 2.00 1.75
MF-USML380 5.59 5.05 4.48 3.80 3.23 2.95 2.70 2.17 1.90
MF-USML400 5.80 5.25 4.70 4.00 3.40 3.10 2.80 2.28 2.00
MF-USML450 6.30 5.65 4.95 4.50 3.83 3.40 2.95 2.50 2.05
MF-USML500 7.00 6.25 5.50 5.00 4.25 3.75 3.25 2.75 2.25
MF-USML600 8.40 7.50 6.60 6.00 5.10 4.50 3.90 3.30 2.65
MF-USML650 9.10 8.15 7.15 6.50 5.50 4.90 4.25 3.60 2.85
MF-USML700 9.80 8.75 7.70 7.00 5.95 5.25 4.55 3.85 3.05
Recommended Pad Layout
2.5 ± 0.1
(.098 ± .004)
2.0 ± 0.1
(.079 ± .004)
1.0 ± 0.05
(.039 ± .002)
1.0 ± 0.05
(.039 ± .002)
Bottom View
D E
A
B
C
Top View Side View
Packaging Specications
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 Series - Low Ohmic PTC Resettable Fuses
How to Order
MF - USML 175 - 2
Multifuse® Product
Designator
Series
USML = 1210 Low-Ohmic
Surface Mount Component
Hold Current, Ihold
175 - 700 (1.75 - 7.00 Amps)
Packaging
Packaged per EIA 481
-2 = Tape and Reel
Typical Part Marking
Represents total content. Layout may vary.
MF-USML SERIES, REV. I, 02/19
PART IDENTIFICATION:
MF-USML175 = U17
MF-USML190 = U19
MF-USML200 = U20
MF-USML230 = U23
MF-USML250 = U25
MF-USML270 = U27
MF-USML300 = U30
MF-USML350 = U35
MF-USML380 = U38
MF-USML400 = U40
MF-USML450 = U45
MF-USML500 = U50
MF-USML600 = U60
MF-USML650 = U65
MF-USML700 = U70
MANUFACTURING DATE CODE IS
LOCATED ON PACKING LABEL.
U30
Asia-Pacic:
Tel: +886-2 2562-4117
Email: asiacus@bourns.com
Europe:
Tel: +36 88 885 877
Email: eurocus@bourns.com
The Americas:
Tel: +1-951 781-5500
Email: americus@bourns.com
www.bourns.com
Solder Reow Recommendations
Notes:
MF-USML 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 prole,
devices may not meet the published specications.
Compatible with Pb and Pb-free solder reflow proles.
Excess solder may cause a short circuit, especially during
hand soldering. Please refer to the Multifuse® Polymer PTC
Soldering Recommendation guidelines.
Temperature of Lead/Pad Junction
Process Materials Temperature Time
Description Interval
1. Apply solder paste to Sn 96.5 / Ag 3.0 / Cu 0.5 Room temperature
test board (8 - 10 mil thick) Alloy water soluble or no
clean solder paste
(see note 1)
single sided epoxy glass
(G10) (UL approved)
PC board approx. 4x4x.06 in.
2. Place test units onto board 6 units/board
3. Ramp up Convection oven (see note 2) 2.5 °C ± 0.5 °/sec.
4. Preheat (TS.ces 03 ± 09C° 091 ot C° 051)
5. Time above liquidus (TL.ces 09-06C° 022)
6. Peak temperature (TP° 5-/° 0+ C° 052)
10-20 sec. within
5 °C of peak
.ces/C° 5.0 ± C° 3erutarepmet mooRnwod pmaR.7
(see note 2)
8. Cleaning water clean profile High pressure deionized 72 °F to 160 °F As required
water 65 PSI max. (22 °C to 71 °C)
Inspect solder joint to determine if solder joint is
acceptable (i.e. exhibits wetting of joint’s surface).
Use the following criteria (ref. acceptability of printed
board assemblies, IPC-A-610):
A) Acceptable (see Figure 1)
(1) The solder connection wetting angle (solder to
component and solder to PCB termination)
does not exceed 90 °.
(2) Solder balls that do not violate minimum
electrical clearances and are attached
(soldered) to a metal surface.
B) Unacceptable (see Figure 2)
(1) Solder connection wetting angle exceeding
90 °.
(2) Incomplete reflow of solder paste.
(3) Dewetting.
If unacceptable, determine cause and correct prior to
next run.
NOTES:
1. Water soluble solder paste only above 100K.
2. Refer to ref. temperature profile. Temperature at
lead/pad junction with “K” type thermocouple.
3. Units that are board mounted for environmental
testing must see a peak temperature in the reflow
zone, as specified. This is to ensure that all test
units will see “worst case conditions”.
4. Ramp down rate to be measured from 245 °C to
150 °C.
5. Process Description 8 does not apply to open
frame trimmers.
(Derived using 6-zone Convection Oven)
TP
TP
tp
ts
TTO
RAMP-UP L
TL
tL
T MAX.
S
T MIN.
25
PREHEAT
S
Temperature
Time
CRITICAL ZONE
RAMP-DOWN
t 25 °C TO PEAK
Prole Feature Pb-Free Assembly
Average Ramp-Up Rate (Tsmax to Tp)3 °C / second max.
PREHEAT:
Temperature Min. (Tsmin)
Temperature Max. (Tsmax)
Time (Tsmin to Tsmax) (ts)
150 °C
200 °C
60~180 seconds
TIME MAINTAINED ABOVE:
Temperature (TL)
Time (tL)
217 °C
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.
MF-USML Series
Tape Dimensions per EIA 481
W 12.0 ± 0.3
(0.472 ± 0.012)
P0 4.0 ± 0.1
(0.157 ± 0.004)
P1 4.0 ± 0.1
(0.157 ± 0.004)
P2 2.0 ± 0.05
(0.079 ± 0.002)
A0 2.9 ± 0.10
(0.114 ± 0.004)
B0 3.50 ± 0.10
(0.138 ± 0.004)
B1 max. 4.5
(0.177)
D0 1.5 + 0.1/-0.0
(0.059 + 0.004/-0)
F 5.5 ± 0.05
(0.216 + 0.002)
E1 1.75 ± 0.10
(0.069 ± 0.004)
E2 typ. 10.25
(0.404)
T max. 0.6
(0.024)
T1 max. 0.1
(0.004)
K0 (MF-USML175~MF-USML400) 0.65 ± 0.10
(0.026 ± 0.004)
K0 (MF-USML450~MF-USML700) 1.10 ± 0.10
(0.043 ± 0.004)
Leader min. 390
(15.35)
Trailer min. 160
(6.30)
Reel Dimensions
A max. 185
(7.283)
N min. 50
(1.97)
W1 12.4 + 1/-0
(0.488 + 0.039/-0)
W2 max. 15.4
(0.606)
MF-USML Series - Low Ohmic PTC Resettable Fuses
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.
B1
N(HUB DIA.)
(MEASURED
AT HUB)
A
T
COVER
TAPE
K0
T1A0
W2
(MEASURED
AT HUB)
W
1
P1
B0
F
D0P2
P
0
E2
E1
W
DIMENSIONS: MM
(INCHES)
3312 - 2 mm SMD Trimming Potentiometer
Application Notice
MFAN 12/18
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.
Bourns® Multifuse® PPTC Resettable Fuses
Users are responsible for independent and adequate evaluation of Bourns® Multifuse® Polymer PTC devices in the user’s
application, including the PPTC device characteristics stated in the applicable data sheet.
Polymer PTC devices must not be allowed to operate beyond their stated maximum ratings. Operation in excess of such
maximum ratings could result in damage to the PTC device and possibly lead to electrical arcing and/or re. Circuits with
inductance may generate a voltage above the rated voltage of the polymer PTC device and should be thoroughly evaluated
within the user’s application during the PTC selection and qualication process.
Polymer PTC devices are intended to protect against adverse effects of temporary overcurrent or overtemperature
conditions up to rated limits and are not intended to serve as protective devices where overcurrent or overvoltage conditions
are expected to be repetitive or prolonged.
In normal operation, polymer PTC devices experience thermal expansion under fault conditions. Thus, a polymer PTC
device must be protected against mechanical stress, and must be given adequate clearance within the user’s application to
accommodate such thermal expansion. Rigid potting materials or xed housings or coverings that do not provide adequate
clearance should be thoroughly examined and tested by the user, as they may result in the malfunction of polymer PTC
devices if the thermal expansion is inhibited.
Exposure to lubricants, silicon-based oils, solvents, gels, electrolytes, acids, and other related or similar materials may
adversely affect the performance of polymer PTC devices.
Aggressive solvents may adversely affect the performance of polymer PTC devices. Conformal coating, encapsulating,
potting, molding, and sealing materials may contain aggressive solvents including but not limited to xylene and toluene,
which are known to cause adverse effects on the performance of polymer PTCs. Such aggressive solvents must be
thoroughly cured or baked to ensure their complete removal from polymer PTCs to minimize the possible adverse effect
on the device.
Recommended storage conditions should be followed at all times. Such conditions can be found on the applicable data
sheet and on the Multifuse® Polymer PTC Moisture/Reow Sensitivity Classication (MSL) note:
https://www.bourns.com/docs/RoHS-MSL/msl_mf.pdf
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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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
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the user’s sole risk.
'$42$ -#+$5$+.%3$23(-& //+(" !+$3..41-2® custom products shall be negotiated on a case-by-case basis by Bourns
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also apply to such Bourns® custom products.
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