CO
M
G E & PL I
AN
N
FR
T*
EE
**
Applications
■ Radial leaded devices
■ Cured, flame retardant epoxy polymer
■
■
■
■
LO
HA
Ro
HS
Features
■
■
■
■
insulating material meets UL 94V-0
requirements
Bulk packaging, tape and reel available
Resettable circuit protection
Agency recognition:
RoHS compliant* and halogen free**
Food blenders, coffee machines
HVAC
Electric fans, blowers
AC adaptors
MF-RM Series - Line Voltage PTC Resettable Fuses
Electrical Characteristics
Maximum
Voltage
Max.
I
Current hold
Itrip
Model
1 Hour
Initial
Post-Trip
Resistance Resistance
R1max
Max. Time To
Trip
Tripped
Power
Dissipation
Oper.
Inter.
Imax
at 23 °C
Min.
at 23 °C
Max.
at 23 °C
at 23 °C
Typ.
at 23 °C
VAC
VAC
Amps
Amps
Ohms
Ohms
Amps Seconds
Watts
Agency
Recognition
cUL
TÜV
E174545 50232433
MF-RM005/240
240
265
1.0
0.05
0.12
18.5
65.0
0.25
10.0
0.9
✓
✓
MF-RM008/240
240
265
1.2
0.08
0.19
7.4
26.0
0.40
10.0
0.9
✓
✓
MF-RM012/240
240
265
1.2
0.12
0.30
3.0
12.0
0.60
15.0
1.0
✓
✓
MF-RM016/240
240
265
2.0
0.16
0.37
2.5
7.80
0.80
15.0
1.4
✓
✓
MF-RM025/240
240
265
3.5
0.25
0.56
1.3
3.80
1.25
18.5
1.5
✓
✓
MF-RM033/240
240
265
4.5
0.33
0.74
0.77
2.60
1.65
21.0
1.7
✓
✓
MF-RM040/240
240
265
5.5
0.40
0.90
0.60
1.90
2.00
24.0
2.0
✓
✓
MF-RM055/240
240
265
7.0
0.55
1.25
0.45
1.45
2.75
26.0
3.4
✓
✓
Environmental Characteristics
Item
Additional Information
Condition
Criteria
Operating Temperature
-20 °C to +85 °C
Recommended Storage
+40 °C max. / 70 % R.H. max.
Passive Aging
+85 °C, 1000 hours
±20 % typical resistance
change
Humidity Aging
+85 °C, 85 % R.H. 1000 hours
±20 % typical resistance
change
Thermal Shock
-40 °C to +85 °C, 10 times
±15 % typical resistance
change
Solvent Resistance
MIL-STD-202, Method 215
No change
(marking still legible)
Vibration
MIL-STD-883C, Method 2007.1
Condition A
No change
(Rmin ≤ R ≤ R1max)
Moisture Sensitivity Level
(MSL)
See Note
ESD Classification
Class 6 (per AEC-Q200-2, HBM)
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
Click these links for more information:
PRODUCT TECHNICAL INVENTORY SAMPLES
SELECTOR LIBRARY
CONTACT
* 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.
Advantages
Benefits
■ Resettable feature with overtemperature and overcurrent protection
■ Reduced repair and replacement costs
can save expensive components from having to be replaced after
tripping, e.g., transformers with built in thermal fuses
■ Reduced nuisance tripping
■ Combined overcurrent and overtemperature protector in one device
■ Faster than bimetallic switch designs that take on average
approximately 30 seconds to cool down and reset
■ Generally lower electromagnetic interference than bimetallic switches
MF-RM Series - Line Voltage PTC Resettable Fuses
Test Procedures and Requirements
Item
Test Conditions
Accept/Reject Criteria
Visual/Mechanical
Verify dimensions and materials
Per MF physical description
Resistance
In still air @ 23 °C
Rmin ≤ R ≤ Rmax
Time to Trip
At specified current, Vmax, 23 °C, still air
T ≤ max. time to trip (seconds)
Hold Current
30 min. at Ihold, still air
No trip
Trip Cycle Life
Operating voltage, Imax, 100 cycles
No arcing or burning
Trip Endurance A
Operating voltage, Imax, 24 hours
No arcing or burning
Trip Endurance B
Interrupt voltage, Imax, 30 minutes
No arcing or burning
Solderability
245 °C ± 5 °C, 5 seconds
95 % min. coverage
Thermal Derating Table - Ihold (Amps)
Ambient Operating Temperature
Model
MF-RM005/240
MF-RM008/240
MF-RM012/240
MF-RM016/240
MF-RM025/240
MF-RM033/240
MF-RM040/240
MF-RM055/240
-20 ºC
0 ºC
23 ºC
40 ºC
50 ºC
60 ºC
70 ºC
85 ºC
0.08
0.12
0.18
0.24
0.38
0.50
0.61
0.80
0.06
0.10
0.15
0.20
0.32
0.42
0.51
0.68
0.05
0.08
0.12
0.16
0.25
0.33
0.40
0.55
0.04
0.07
0.10
0.13
0.21
0.27
0.33
0.46
0.04
0.06
0.09
0.11
0.18
0.23
0.28
0.40
0.03
0.05
0.07
0.10
0.15
0.20
0.24
0.35
0.03
0.04
0.06
0.08
0.13
0.17
0.20
0.29
0.02
0.03
0.04
0.05
0.09
0.11
0.14
0.22
Typical Time to Trip at 23 ˚C
MF - RM 005 / 240 - 2 - 17
100
A
Time to Trip (Seconds)
How to Order
B
C
D
F G H
E
Multifuse®
Product
Designator
A = MF-RM005/240
B = MF-RM008/240
C = MF-RM012/240
D = MF-RM016/240
E = MF-RM025/240
F = MF-RM033/240
G = MF-RM040/240
H = MF-RM055/240
10
1
0.1
0.1
Series
RM = Radial Leaded
Line Voltage
Component
Hold Current, Ihold
005-055 (0.05 A - 0.55 A)
Operating Voltage, Vmax
240 = 240 Vac
Packaging Options
- 0 = Bulk Packaging
- 2 = Tape and Reel per EIA-468
1
10
Fault Current (Amps)
Part Number Suffix Option
- 17 = Straight Leads where Kinked Leads
are Standard
The Time to Trip curves represent typical performance of a device in a simulated application environment.
Actual performance in specific customer applications may differ from these values due to the influence of other variables.
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-RM Series - Line Voltage PTC Resettable Fuses
Product Dimensions
Model
MF-RM005/240
MF-RM008/240
MF-RM012/240
MF-RM016/240
MF-RM025/240
MF-RM033/240
MF-RM040/240
MF-RM055/240
C
A
Max.
B
Max.
Nom.
Tol. ±
D
Min.
E
Max.
8.3
(0.327)
8.3
(0.327)
8.3
(0.327)
9.9
(0.390)
10.0
(0.394)
11.4
(0.449)
11.5
(0.453)
14.0
(0.551)
12.9
(0.508)
12.9
(0.508)
12.9
(0.508)
13.8
(0.543)
20.0
(0.787)
20.0
(0.787)
20.9
(0.823)
22.4
(0.882)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
0.7
(0.028)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
7.6
(0.299)
3.8
(0.150)
3.8
(0.150)
3.8
(0.150)
3.8
(0.150)
3.8
(0.150)
3.8
(0.150)
3.8
(0.150)
4.1
(0.161)
Physical Characteristics
Style
1
1
1
1
2
2
2
2
Lead Dia.
Material
0.51
(0.020)
0.51
(0.020)
0.51
(0.020)
0.51
(0.020)
0.65
(0.026)
0.65
(0.026)
0.65
(0.026)
0.81
(0.032)
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
DIMENSIONS:
Style 1
Style 2
A
Typical Part Marking
A
E
E
Represents total content. Layout may vary.
MANUFACTURER'S
TRADEMARK
PART
IDENTIFICATION
B
LEAD
DIA.
DATE CODE
(FIRST DIGIT =
LAST DIGIT OF YEAR;
NEXT THREE DIGITS =
DAY OF YEAR)
B
D
C
MM
(INCHES)
RM055
0220S
COUNTRY OF
MANUFACTURE
(S = CHINA)
D
LEAD
DIA.
C
Also available with straight leads (see How to Order).
Packaging Quantity
Packaging options
Models
Unit Quantity (Pcs.)
Unit
Bulk
All models
MF-RM005/240 ~ MF-RM040/240
MF-RM055/240
500
2000
1000
Bag
Tape & Reel
Reel
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-RM Series Tape and Reel Specifications
Devices taped using EIA-468/IEC 60286-2 standards. See table below and figures for details.
IEC
Mark
Dimension Description
EIA
Mark
Dimensions
Tolerance
+1.0/-0.5
(+.039/-.020)
min.
Carrier tape width
W
W
18
(.709)
Hold down tape width
W0
W0
5
(.197)
Hold down tape
No protrusion
Adhesive tape position
W2
W2
3
(.118)
max.
Sprocket hole position
W1
W1
9
(.354)
+0.75/-0.5
(+.030/-.020)
Sprocket hole diameter
D0
D0
4
(.157)
±0.2
(±.0078)
Height to seating plane (straight lead)
H
H
18 ~ 20
(.709 ~ .787)
Height to seating plane (formed lead)
H0
H0
16
(.630)
±0.5
(±.020)
Overall height above abscissa: MF-RM005/240 ~ RM016/240
H1
H1
38.5
(1.516)
max.
Overall height above abscissa: MF-RM025/240 ~ RM055/240
H1
H1
48.0
(1.890)
max.
L
11
(.433)
max.
Cutout length
Sprocket hole pitch
P0
P0
12.7
(.500)
±0.3
(±.012)
Device pitch: MF-RM005/240 ~ MF-RM040/240
P
P
12.7
(.500)
±0.3
(±.012)
Device pitch: MF-RM055/240
P
P
25.4
(1.00)
±0.3
(±.012)
20 consecutive
±1
(±.039)
Pitch tolerance
Composite tape thickness
t
t
0.9
(.035)
max.
Overall tape and lead thickness: MF-RM005/240 ~ MF-RM040/240
t1
t1
2.0
(.079)
max.
Overall tape and lead thickness: MF-RM055/240
t1
t1
2.3
(.091)
max.
0
±0.3
(±.012)
Splice sprocket hole alignment
Front-to-back deviation
Δh
Δh
0
±1.0
(±.039)
Side-to-side deviation
Δp
Δp
0
±1.3
(±.051)
Ordinate to adjacent component lead
P1
P1
3.81
(.150)
±0.7
(±.028)
Lead spacing
F
F
5.08
(.200)
+0.6/-0.2
(+.024/-.008)
— Continued on next page —
DIMENSIONS:
MM
(INCHES)
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-RM Series Tape and Reel Specifications
Devices taped using EIA-468/IEC 60286-2 standards. See table below and figures for details.
IEC
Mark
Dimension Description
EIA
Mark
Dimensions
Tolerance
62.0
(2.44)
max
Reel width including flanges and hub
W4
w2
Dimension between flanges (measured at hub)
W3
w1
A
a
Reel diameter
Space between flanges (at hub, excluding device)
allow proper reeling and unreeling
370.0
(14.57)
max.
4.75
(.187)
±3.25
(±.128)
Arbor hole diameter
C
c
26.0
(1.024)
±12.0
(±.472)
Core diameter
N
n
80
(3.15)
min.
62 x 372 x 372
(2.44 x 14.6 x 14.6)
max.
3
max.
Box dimensions
Consecutive missing places
Empty places per reel
Less than 0.1 %
Taped Component Dimensions per EIA Mark h
Figure 1
p
h
p
Reference plane
P1
H1
A
L
H0
B
P0
W0
D0
Reel Dimensions - per EIA Mark Figure 2
H1
W2
F
H
W1
W
User direction of feed
t1
Cross section A - B
t
Reel
Upper side
n
a
c
User
direction
of
feed
Tape
Lower side
w1
w2
MF-RM SERIES, REV. G, 05/21
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
PPTC Resettable
Fuses
3312
- ®2 Multifuse
mm SMD® Trimming
Potentiometer
Application Notice
• 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 fire. 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 qualification 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 fixed 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/Reflow Sensitivity Classification (MSL) note:
https://www.bourns.com/docs/RoHS-MSL/msl_mf.pdf
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.
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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Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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