Features
n Radial leaded devices
n Fast tripping resettable PTCs
n Binned and sorted narrow resistance
ranges available
n RoHS compliant*
n Agency recognition:
Applications
n Customer Premise Equipment (CPE)
n Central Office / Telecom Centers (CO)
n Access equipment
MF-RX/250 Series - Telecom PTC Resettable Fuses
*RoHS COMPLIANT
LEAD FREE
*RoHS COMPLIANT
VERSIONS
AVAILABLE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
Environmental Characteristics
Operating/Storage Temperature ........................... -40 °C to +85 °C
Maximum Device Surface Temperature
in Tripped State ................................................ 125 °C
Passive Aging ....................................................... +85 °C, 1000 hours .............................................. ±15 % typical resistance change
Humidity Aging...................................................... +85 °C, 85 % R.H. 1000 hours ............................. ±15 % typical resistance change
Thermal Shock ..................................................... +125 °C to -55 °C,10 times ................................... ±15 % typical resistance change
Solvent Resistance ............................................... MIL-STD-202, Method 215B ................................. No change
Lead Solerability ................................................... ANSI/J-STD-002 ................................................... >95 % coverage
Vibration ............................................................... MIL-STD-883C, Method 2007.1, Condition A ....... ±5 % typical resistance change
Moisture Sensitivity Level (MSL) ......................Level 1
ESD Classication - HBM ................................. Class 6
Test Procedures And Requirements For Model MF-RX/250 Series
Test Test Conditions Accept/Reject Criteria
Visual/Mech. .................................................... Verify dimensions and materials .......................Per MF physical description
Resistance ....................................................... In still air @ 23 °C .............................................Rmin ≤ R ≤ Rmax
Time to Trip ...................................................... TTT current, Vmax, 23 °C .................................T ≤ max. time to trip (seconds)
Hold Current .................................................... 30 min. at Ihold .................................................No trip
Trip Cycle Life .................................................. 250 Vrms, 3A, 10 cycles ...................................No arcing or burning
UL File Number ............................................... E174545
TÜV File Number ............................................. 50260658
Electrical Characteristics
Model
Max.
Operating
Voltage
(Vdc)
Max. Interrupt
Ratings Hold Current Initial Resistance
One Hour
Post-Trip
Resistance
Volts
(Vrms)
Amps
(A)
Amps
at 23 °C
Ohms
at 23 °C
Ohms
at 23 °C
Ohms
at 23 °C
Max. Max. IHMin. Max. Max.
MF-RX012/250 60 250 3.0 0.12 4.0 8.0 16.0
MF-RX012/250-A 60 250 3.0 0.12 7.0 9.0 16.0
MF-RX012/250-C 60 250 3.0 0.12 5.5 7.5 14.0
MF-RX012/250-F 60 250 3.0 0.12 6.0 10.5 16.0
MF-RX012/250-1 60 250 3.0 0.12 6.0 9.0 16.0
MF-RX012/250-2 60 250 3.0 0.12 8.0 10.5 16.0
MF-RX012/250-T 60 250 3.0 0.12 7.0 12.0 16.0
MF-RX012/250U 60 250 3.0 0.12 6.0 10.0 16.0
MF-RX014/250 60 250 3.0 0.145 3.0 6.0 14.0
MF-RX014/250-A 60 250 3.0 0.145 3.0 5.5 12.0
MF-RX014/250-B 60 250 3.0 0.145 4.5 6.0 14.0
MF-RX014/250-T 60 250 3.0 0.145 5.4 7.5 14.0
MF-RX014/250U 60 250 3.0 0.145 3.5 6.5 12.0
MF-RX018/250 60 250 10.0 0.18 0.8 2.0 4.0
MF-RX018/250U 60 250 10.0 0.18 0.8 2.0 4.0
“U” sufx indicates product without insulation coating.
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specificationsaresubjecttochangewithoutnotice.
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-RX/250 Series - Telecom PTC Resettable Fuses
Additional Features
n Ability to withstand AC power cross conditions
n Assists equipment with meeting ITU-T K.20/K.21/K.45
n Assists equipment with meeting Telcordia GR-1089-C Intrabuilding
Product Dimensions
A B C D E Physical Characteristics
Model Max. Max. Nom. Min. Max. Lead Dia. Style Material
MF-RX012/250 6.5 11.0 5.1 ± 0.7 4.7 4.6 0.65 1 Sn/Cu
(0.256) (0.433) (0.201 ± 0.028) (0.185) (0.181) (0.026)
MF-RX012/250U 6.0 10.0 5.1 ± 0.7 4.7 3.8 0.65 2 Sn/Cu
(0.236) (0.394) (0.201 ± 0.028) (0.185) (0.150) (0.026)
MF-RX014/250 6.5 11.0 5.1 ± 0.7 4.7 4.6 0.65 1 Sn/Cu
(0.256) (0.433) (0.201 ± 0.028) (0.185) (0.181) (0.026)
MF-RX014/250U 6.0 10.0 5.1 ± 0.7 4.7 3.8 0.65 2 Sn/Cu
(0.236) (0.394) (0.201 ± 0.028) (0.185) (0.150) (0.026)
MF-RX018/250 11.0 13.6 5.1 ± 0.7 4.7 4.6 0.65 1 Sn/Cu
(0.433) (0.535) (0.201 ± 0.028) (0.185) (0.181) (0.026)
MF-RX018/250U 10.4 12.6 5.1 ± 0.7 4.7 3.8 0.65 2 Sn/Cu
(0.409) (0.496) (0.201 ± 0.028) (0.185) (0.150) (0.026)
Packaging options: BULK: 500 pcs. per bag. TAPE & REEL: 1500 pcs. per reel (available binned).
DIMENSIONS: MM
(INCHES)
Typical Part Marking
Represents total content. Layout may vary.
Thermal Derating Chart - Ihold (Amps)
Model Ambient Operating Temperature
-40 ºC -20 ºC 0 ºC 23 ºC 40 ºC 50 ºC 60 ºC 70 ºC 85 ºC
MF-RX012/250 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
MF-RX014/250 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
MF-RX018/250 0.269 0.240 0.211 0.180 0.153 0.138 0.123 0.109 0.087
Itrip is approximately two times Ihold.
C
D
D
D
D
B
B
B
B
E
E
E
A
E
A
A
A
C
C
C
Style 1 Style 2
Style 3 Style 4
C
D
D
D
D
B
B
B
B
EE
E
A
E
A
A
A
C
C
C
Style 1 Style 2
Style 3 Style 4
Style 1 Style 2
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.
RX012
0 220 S
PART
IDENTIFICATION
YEAR CODE
DATE CODE
MANUFACTURER'S
TRADEMARK
LOCATION CODE:
S = CHINA
MF-RX/250 Series - Telecom PTC Resettable Fuses
How to Order
MF - RX 012/250 U - A 5 - 2
Multifuse®
Product
Designator
Series
RX = Radial Leaded
Component
Hold Current, Ihold
008-018 (0.08-0.18 Amps)
Max. Interrupt Voltage, V
250 (250 Volts)
Telecom Options
U = Uncoated (radial parts only)
Resistance Sorted
Narrow resistance ranges - see
Resistance Options chart
Resistance Bins of 0.5 ohms
05 = 0.5 ohm binned parts (epoxy coated)
5 = 0.5 ohm binned parts (uncoated)
Packaging Options
- 0 = Bulk Packaging
- 2 = Tape and Reel* (available with binned
option)
*Packaged per EIA486-B
Typical Time to Trip at 23 ˚C
MF-RX/250, REV. N 06/17
Resistance Options
Model
Initial Resistance
Values R1max
Bin
Ohms @ 23 ° C Ohms @ 23 ° C
Min. Max. Max.
MF-RX012/250 4.0 8.0 16.0 N/A
MF-RX012/250-A05 7.0 9.0 16.0 0.5
MF-RX012/250-C05 5.5 7.5 14.0 0.5
MF-RX012/250-F05 6.0 10.5 16.0 0.5
MF-RX012/250-105 6.0 9.0 16.0 0.5
MF-RX012/250-205 8.0 10.5 16.0 0.5
MF-RX012/250-T05 7.0 12.0 16.0 0.5
MF-RX012/250U 6.0 10.0 16.0 N/A
MF-RX014/250 3.0 6.0 14.0 N/A
MF-RX014/250-A05 3.0 5.5 12.0 0.5
MF-RX014/250-B05 4.5 6.0 14.0 0.5
MF-RX014/250U 3.5 6.5 12.0 N/A
Specificationsaresubjecttochangewithoutnotice.
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.
100
10
1
0.10
0.01
0
Fault Current (Amps)
Time to Trip (Seconds)
0.5
MF-RX018/250, MF-RX018/250U
MF-RX012/250 & MF-RX012/250U
MF-RX014/250 & MF-RX014/250U
1.0 1.5 2.0 2.5 3.0
Devices taped using EIA468–B/IEC286-2 standards. See table below and Figures 1 through 4 for details.
DIMENSIONS:
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.
MM
(INCHES)
IEC EIA Dimensions
Dimension Description Mark Mark Dimensions Tolerance
Carrier tape width WW18 -0.5/+1.0
(.709) (-0.02/+.039)
Hold down tape width W4 11 min.
W0(.433)
Hold down tape No protrusion
Top distance between tape edges W2W63max.
(.118)
Sprocket hole position W1W59-0.5/+0.75
(.354) (-0.02/+0.03)
Sprocket hole diameter D0D04±0.2
(.157) (±.0078)
Abscissa to plane (straight lead) HH18.5 ±3.0
(.728) (±.118)
Abscissa to plane (kinked lead) H0H016 ±0.5
(.63) (±.02)
Abscissa to top (straight lead) H1H1 38.0 max.
(1.496)
Abscissa to top (kinked lead) H1H1 32.2 max.
(1.268)
Overall width w/lead protrusion (straight lead) C1 55.0 max.
(2.165)
Overall width w/lead protrusion (kinked lead) C1 43.2 max.
(1.7)
Overall width w/o lead protrusion (straight lead) C254.0 max.
(2.126)
Overall width w/o lead protrusion (kinked lead) C242.5 max.
(1.673))
Protrusion of cutout LL 11 max.
(.433)
Sprocket hole pitch P0P0 12.7 ±0.3
(0.5) (±.012)
Pitch tolerance 20 consecutive ±1
(±.039)
Device pitch 12.7 ±0.3
(0.5) (±.012)
Tape thickness tt 0.9 max.
(.035)
Tape thickness with splice t11.5
(.059) max.
Splice sprocket hole alignment 0 ±0.3
(±.012)
Body lateral deviation Δh Δh0±1.0
(±.039)
Body tape plane deviation Δp Δp0±1.3
(±.051)
Lead spacing F F 5.08 -0.5/+0.6
(0.2) (-.020/+.024)
Reel width wW256.0 max.
(2.205)
Reel diameter da 370.0 max.
(14.57)
Space between anges less device 4.75 ±3.25
W1 h(.187) (±.128)
Arbor hole diameter f c26.0 ±12.0
(1.024) (±.472)
Core diameter h n 91 max.
(3.58)
Box 67 372 362 max.
(2.64) (14.6) (14.25)
Consecutive missing places none
Empty places per reel 0.1 %
MF-RX/250 Series Tape and Reel Specifications
h
w
h
f
d
Reel
Upper side
Tape
Lower side
User
direction
of
feed
t
User direction of feed
Cross section A - B
pp
H
H1
Reference plane
W0
H0W1
W
AB
F
D0
P0
I1
I2
L
H1
P1
h
h
h
w
h
f
d
Reel
Upper side
Tape
Lower side
User
direction
of
feed
t
User direction of feed
Cross section A - B
pp
H
H1
Reference plane
W0
H0W1
W
AB
F
D0
P0
L
H1
P1
h
h
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.
Taped Component Dimensions -
Figure 1
Applies to Models:
DIMENSIONS: MM
(INCHES)
Reel Dimensions -
Figure 2
Applies to Models:
DIMENSIONS: MM
(INCHES)
MF-RX012/250U
MF-RX014/250U
MF-RX018/250
MF-RX018/250U
MF-RX/250 Series Tape and Reel Specifications
MF-RX012/250U
MF-RX014/250U
MF-RX018/250
MF-RX018/250U
MF-RX/250 Series Tape and Reel Specifications
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.
h
w
h
f
d
Reel
Upper side
Tape
Lower side
User
direction
of
feed
t
User direction of feed
Cross section A - B
pp
H
H1
Reference plane
W0
H0W1
W
AB
F
D0
P0
L
H1
P1
h
h
h
w
h
f
d
Reel
Upper side
Tape
Lower side
User
direction
of
feed
t
User direction of feed
Cross section A - B
pp
H
H1
Reference plane
W0
H0W1
W
AB
F
D0
P0
L
H1
P1
h
h
Taped Component Dimensions -
Figure 3
Applies to Models:
DIMENSIONS: MM
(INCHES)
Reel Dimensions -
Figure 4
Applies to Models:
MF-RX012/250
MF-RX012/250-A
MF-RX012/250-C
MF-RX012/250-F
MF-RX012/250-1
MF-RX012/250-2
MF-RX012/250-T
MF-RX014/250
MF-RX014/250-A
MF-RX014/250-B
MF-RX014-250-T
MF-RX012/250
MF-RX012/250-A
MF-RX012/250-C
MF-RX012/250-F
MF-RX012/250-1
MF-RX012/250-2
MF-RX012/250-T
MF-RX014/250
MF-RX014/250-A
MF-RX014/250-B
MF-RX014-250-T
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C1753 05/17/18R