Features
■ Radial leaded devices
■ Fast tripping resettable PTCs
■ Binned and sorted narrow resistance
ranges available
■ RoHS compliant*
■ Agency recognition:
Applications
■ Customer Premise Equipment (CPE)
■ Central Offi ce / Telecom Centers (CO)
■ Access equipment
MF-RX/250 Series - Telecom PTC Resettable Fuses
*RoHS Directive 2002/95/EC Jan 27, 2003 including Annex.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
*RoHS COMPLIANT
RX012
24001K
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
.......................................................................... +60°C, 1000 hours ................................................ ±15 % typical resistance change
Humidity Aging ..................................................... +85 °C, 85 % R.H. 500 hours ............................... ±15 % typical resistance change
Thermal Shock ..................................................... MIL-STD-202F, Method 107G, ............................. ±10 % typical resistance change
.......................................................................... +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
Flammability ......................................................... IEC 695-2-2 .......................................................... No Flame for 60 secs.
Vibration ............................................................... MIL-STD-883C, Method 2007.1, Condition A ...... ±5 % typical resistance change
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 ...................................................... 5 times Ihold, 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
UL File Number ............................................... E 174545S
CSA File Number ............................................. CA 110338
TÜV File Number ............................................. R2057213
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” suffi x indicates product without insulation coating.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
MF-RX/250 Series - Telecom PTC Resettable Fuses
Additional Features
■ Ability to withstand AC power cross conditions
■ Assists equipment with meeting ITU-T K.20/K.21/K.45
■ 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
B
E
A
D
B
E
A
C
Style 1 Style 2
RX012
24001K
MANUFACTURER'S
TRADEMARK
NOTE: UNCOATED PARTS HAVE NO PART MARKING.
MARKING IS ON LABEL ONLY.
PART
IDENTIFICATION
DATE CODE
(FIRST DIGIT =
LAST DIGIT OF YEAR;
SECOND DIGIT = MONTH,
AS FOLLOWS:
1-9 = JAN-SEPT
X,Y,Z = OCT-DEC)
BATCH/LOCATION
(3 DIGITS = BATCH CODE;
K = KOREA
S = CHINA)
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
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. J, 05/11
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 0.5
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 0.5
MF-RX014/250 3.0 6.0 14.0 0.5
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 0.5
1000
100
10
1
0.10
0.01
0
Fault Current (Amps)
Time to Trip (Seconds)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
MF-RX018/250, MF-RX018/250U
MF-RX012/250 & MF-RX012/250U
MF-RX014/250 & MF-RX014/250U
IEC EIA Dimensions
Dimension Description Mark Mark Dimensions Tolerance
Carrier tape width W W 18 -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 W2 W
6 3
max.
(.118)
Sprocket hole position W1 W
5 9 -0.5/+0.75
(.354) (-0.02/+0.03)
Sprocket hole diameter D0 D
0 4 ±0.2
(.157) (±.0078)
Abscissa to plane (straight lead) H H 18.5 ±3.0
(.728) (±.118)
Abscissa to plane (kinked lead) H0 H
0 16 ±0.5
(.63) (±.02)
Abscissa to top (straight lead) H1 H
1 38.0
max.
(1.496)
Abscissa to top (kinked lead) H1 H
1 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) C2 54.0
max.
(2.126)
Overall width w/o lead protrusion (kinked lead) C2 42.5
max.
(1.673)
Lead protrusion I1 L
1 1.0
max.
(.039)
Protrusion of cutout L L 11
max.
(.433)
Protrusion beyond hold-down tape I2 I
2 Not specifi ed
Sprocket hole pitch P0 P
0 12.7 ±0.3
(0.5) (±.012)
Pitch tolerance 20 consecutive ±1
(±.039)
Device pitch: MF-R005–MF-R160, MF-R/90,
MF-RX110/72–MF-RX185/72
12.7 ±0.3
(0.5) (±.012)
Device pitch: MF-R185–MF-R400, MF-RX110–MF-RX375
MF-R/600, MF-RX250/72–MF-RX375/72
25.4 ±0.6
(1.0) (±.024)
Tape thickness t t 0.9
max.
(.035)
Tape thickness with splice: MF-R010–MF-R160, t1
max.
MF-RX110/72–MF-RX185/72
1.5
(.059)
Tape thickness with splice: MF-R250–MF-R1100, t1
max.
MF-RX110–MF-RX375, MF-R/90, MF-RX250/72-MF-RX375/72 2.3
(.091)
Splice sprocket hole alignment
0 ±0.3
(±.012)
Body lateral deviation Δh Δh 0
±1.0
(±.039)
Body tape plane deviation Δp Δp 0
±1.3
(±.051)
MF-R, MF-R/90, MF-R/600, MF-RX, MF-RX/72 & MF-RX/250 Series
Tape and Reel Specifi cations
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
Devices taped using EIA468–B/IEC286-2 standards. See table below and Figures 1 and 2 for details.
DIMENSIONS: MM
(INCHES)
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
IEC EIA Dimensions
Dimension Description Mark Mark Dimensions Tolerance
Lead spacing: MF-R, MF-R/90, MF-R/600, MF-RX, MF-RX/72 F F 5.08 ±0.2
(0.2) (±0.008)
Lead spacing: MF-RX/250 F F 5.08 -0.5/+0.6
(0.2) (-.020/+.024)
Reel width w W2 56.0
max.
(2.205)
Reel diameter d a 370.0
max.
(14.57)
Space between fl anges less device 4.75 ±3.25
W1 h (.187) (±.128)
Arbor hole diameter f c 26.0 ±12.0
(1.024) (±.472)
Core diameter: MF-R, MF-RX, MF-R/90 h n 80
max.
(3.15)
Core diameter: MF-RX/250, MF-R/600 h n 91
max.
(3.58)
Box: MF-R, MF-RX, MF-R/90 56 372 372
max.
(2.2) (14.6) (14.6)
Box: MF-RX/250 67 372 362
max.
(2.64) (14.6) (14.25)
Box: MF-R/600 64 372 362
max.
(2.52) (14.6) (14.25)
Consecutive missing places: MF-R, MF-RX, MF-R/90 3 max.
Consecutive missing places: MF-RX/250, MF-R/600 none
Empty places per reel: MF-R, MF-RX, MF-R/90 Not specifi ed
Empty places per reel: MF-RX/250, MF-R/600 0.1 %
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
Taped Component Dimensions - Figure 1
DIMENSIONS: MM
(INCHES)
MF-R, MF-R/90, MF-R/600, MF-RX, MF-RX/72 & MF-RX/250 Series
Tape and Reel Specifi cations
Reel Dimensions - Figure 2
