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
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
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 ...................................................... 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 ............................................... E 174545
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” suffi 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.
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.