Bourns® Multifuse® Resettable Fuses Polymeric PTC & Ceramic PTC Short Form Brochure Bourns® Multifuse® Products he Bourns® Multifuse® family of Polymeric Positive Features/Benefits Applications Temperature Coefficient (PPTC) resettable fuses are T • Resettable overcurrent protection • Computer used in a wide variety of circuit protection applications. • Heat element • Battery • Agency recognition - UL, CSA, TÜV • Automotive Under fault conditions the device resistance will rise • AEC-Q200 Qualified • Telecommunications exponentially and remain in a “tripped” state, providing • Standard footprints • Industrial continuous circuit protection until the fault is removed. • Standard packaging options • Consumer Once the fault is removed and the power cycled, the device • Extra low resistance will return to its normal low resistance state. • RoHS compliance standard • Custom designs available Multifuse® Products – How They Work Multifuse® Products – How They Are Used I=V/R MF I RMF e +t VS RL I=V/RL Crystalline Amorphous Polymer Polymer Log Resistanc Temperature Typical Circuit Application PTC Response Characteristic Conducting Non-conducting Carbon Chains Carbon Chains COLD HOT It is the materials used in resettable fuses that allow them to reset after a fault condition has been removed. Resettable fuses Resettable fuses are manufactured in the form of a exhibit a positive temperature coefficient effect when heated. conductive plastic, which is comprised of a non-conductive While many materials exhibit a PTC effect when heated (an crystalline polymer with highly conductive carbon black increase in resistance in response to a positive change in particles impregnated throughout the crystal lattice. Because temperature), what makes the material used in resettable fuses unique is the fact that the increase in resistance changes of the close proximity of the carbon black particles within the exponentially rather than in a linear manner. crystal lattice, under normal conditions current is allowed to flow easily through the conductive plastic. However under a I=V/RMF I R fault condition, when there is an increase in current, the MF 2 e conductive plastic heats at the rate of I R. As the material +t continues to heat, it eventually reaches the phase VS RL transformation temperature, which changes theI=V/R crystalL structure into an amorphous structure. OnceLog Resistanc the material has Temperature transformed into this amorphous structure, the conductive Typical Circuit Application particles become isolated and are unable toPT conductC Response current Charac teristic hence the drastic change in material resistance. It is only It is because of this transformation from a low resistance state to when the current is removed that the material is allowed to a high resistance state that allows the resettable fuse to protect cool and return to its original crystal structure. loads. It is this transition from the low resistance state to high resistance state that is referred to as tripping. The time it takes Agency File Numbers for a resettable fuse to trip is relatively quick, depending on how high the fault current is and it can be as quick as a fraction of a UL File Number................................................E 174545S second. Hence they are an excellent form of protection for most applications where sensitive devices need extra protection. CSA File Number .............................................CA 110338 2 TÜV File Number ............................................R2057213 How To Order Definitions MF - RX 012/250 U - A 05 - 2 - X Agency Approvals Bourns® Multifuse® Product Designator Bourns® PPTCs are certified under UL, CSA, IEC and Series TÜV registration programs. RX = Radial Leaded R = Radial Leaded Current, Hold (Ihold) RG = Radial Leaded The maximum current a PPTC device can pass without RHT = High Temp. Radial Leaded RM = AC Line Voltage Radial Leaded interruption. ASML = Surface Mount ( 0402) FSMF = Surface Mount ( 0603) Current, Maximum (Imax) FSML = Surface Mount ( 0603) The maximum fault current a PPTC device can PSMF = Surface Mount (0805) PSML = Surface Mount ( 0805) withstand without damage at the rated voltage. PSHT = Surface Mount ( 0805) NSMF = Surface Mount (1206) Current, Trip (Itrip) NSML = Surface Mount ( 1206) The minimum current that will switch a PPTC from the NSHT = Surface Mount ( 1206) USMF = Surface Mount (1210) low resistance to the high resistance state. USML = Surface Mount ( 1210) Fault Current USHT = Surface Mount ( 1210) MSMF = Surface Mount (1812) The peak current that flows through a PPTC or wire SMDF = Surface Mount (2018) during a short circuit or arc back. LSMF = Surface Mount ( 2920) SM = Surface Mount Positive Temperature Coefficient (PTC) SMHT = High Temp. Surface Mount SD = Dual Package Surface Mount A characteristic of the PPTC device that describes the LR = Axial Leaded Strap large increase in resistance as the device reaches its LS = Axial Leaded Strap S = Axial Leaded Strap switching (trip) temperature. SVS = Axial Leaded Strap VS = Axial Leaded Strap Resistance, Post Trip (R1max) VSN = Axial Leaded Strap The maximum resistance one hour after a PPTC device D = Disc/Chip Configuration has been tripped and power has been removed. Hold Current, Ihold Resistance, Post Reflow (R1max) Voltage Options: The maximum resistance one hour after a PPTC surface Max. Interrupt Voltage, V mount device has been reflow soldered. Construction Options: N = Narrow Device Option (3.6 mm)* S = Slotted Lead Option (one side)* Voltage, Maximum (Vmax) SS = Slotted Lead Option (two sides)* The maximum voltage a PPTC device can withstand U = Uncoated T = Pretripped ** without damage at the rated current. Resistance Sorted** (see individual data sheets) Resistance Bins of 0.5 Ω** Product Selection Guide 05 = 0.5 Ω Packaging Options 1. What is the normal circuit operating current (Ihold)? - 0 = Bulk Packaging - 2 = Tape and Reel 2. What is the maximum circuit voltage (Vmax)? - AP = Ammo-Pak 3. What is the maximum fault current (Imax)? Part Number Suffix Option 4. What is the preferred form factor? - 14 = Kinked Leads in Place of Standard Straight Leads - 17 = Straight Leads in Place of Standard Kinked Lead Note: Other factors including thermal derating and time to trip characteristics may be important application *Axial Leaded Strap products only. considerations. Please refer to the full Bourns data sheet of **Telecom Radial Leaded products only. each product at http://www.bourns.com/products/circuit- ***Radial Leaded products only. protection/resettable-fuses-multifuse-pptc. 3 Radial Leaded Low Voltage Products Style 1 Style 2 Style 3 Style 4 Style 5 A A A A A Features Applications ■ Bulk or tape & reel packaging ■ Computers and peripherals B B B B B ■ Industry standard sizes ■ General electronics ■ Automotive ■ Consumer appliances C ■ Electronic toys C C C C MF-R Series 16-60 Volts MF-RG Series Operating Temperature Radial Leaded 0.05 – 11 Amps Hold Current Radial Leaded 16 V -40 °C ~ 85 °C Style 1 Style 2 Style 3 C Initial 1 Hour (R1) 1 Hour (R ) A C A C Initial 1 Resistance Post-Trip Dimensions Resistance Post-Trip Dimensions Ihold Resistance mm/(in) B Ihold Resistance mm/(in) Model Amperes V max. I max. Ohms at 23 °C B Style B Model Amperes V max. I max. Ohms at 23 °C Style at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom. A at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom. Side View End View Top and Bottom View Side View8.0 8.3 Top and Bottom5.1 View Side View MF-R005 0.05 60 40 7.3 22.0 4 MF- RG300 3.0 16 100 38 64.5 7.1 11.0 5.1 ±0.7 2 (0.315) (0.327) (0.201) (0.28) (0.443) (0.201 ±0.028) 7.4 12.7 5.1 MF-R010 0.10 60 40 2.50 7.50 1 MF- RG400 4.0 16 100 21 38.5 8.9 12.8 5.1 ±0.7 2 (0.291) (0.500) (0.201) (0.35) (0.443) (0.201 ±0.028) 7.4 12.7 5.1 MF-R017 0.17 60 40 2.00 8.00 1 MF- RG500 5.0 16 100 15 23 10.4 14.3 5.1 ±0.7 2 (0.291) (0.500) (0.201) (0.409) (0.563) (0.201 ±0.028) 7.4 12.7 5.1 MF-R020 0.20 60 40 1.50 4.40 1 MF- RG600 6.0 16 100 10 18.5 10.7 17.1 5.1 ±0.7 2 (0.291) (0.500) (0.201) (0.421) (0.673) (0.201 ±0.028) 7.4 12.7 5.1 MF-R025 0.25 60 40 1.00 3.00 1 MF- RG650 6.5 16 100 8.8 15.8 11.24 19.7 5.1 ±0.7 2 (0.291) (0.500) (0.201) (0.441) (0.776) (0.201 ±0.028) 7.4 13.4 5.1 MF-R030 0.30 60 40 0.76 2.10 1 MF- RG700 7.0 16 100 7.7 13.0 11.2 19.7 5.1 ±0.7 2 (0.291) (0.528) (0.201) (0.441) (0.776) (0.201 ±0.028) 7.4 13.7 5.1 MF-R040 0.40 60 40 0.52 1.29 1 MF- RG800 8.0 16 100 5.6 11 12.7 20.9 5.1 ±0.7 2 (0.291) (0.539) (0.201) (0.500) (0.823) (0.201 ±0.028) 7.9 13.7 5.1 MF-R050 0.50 60 40 0.41 1.17 1 MF- RG900 9.0 16 100 4.7 9.2 14.0 21.7 5.1 ±0.7 2 (0.311) (0.539) (0.201) (0.551) (0.854) (0.201 ±0.028) 9.7 15.2 5.1 MF-R065 0.65 60 40 0.27 0.72 1 MF- RG1000 10.0 16 100 4.0 7.1 16.5 21.7 5.1 ±0.7 2 (0.382) (0.598) (0.201) (0.650) (0.854) (0.201 ±0.028) 10.4 16.0 5.1 MF-R075 0.75 60 40 0.18 0.60 1 MF- RG1100 11.0 16 100 3.7 6.2 17.5 26 5.1 ±0.7 2 (0.409) (0.630) (0.201) (0.689) (1.024) (0.201 ±0.028) 11.7 16.7 5.1 MF-R090 0.90 60 40 0.14 0.47 1 (0.461) (0.657) (0.201) 7.4 12.2 5.1 MF-R090-0-9 0.90 30 40 0.07 0.22 3 (0.291) (0.480) (0.201) 8.9 14.0 5.1 MF-R110 1.10 30 40 0.10 0.27 1 (0.350) (0.551) (0.201) MF-RHT Series Operating Temperature 8.9 18.9 5.1 -40 °C ~ +125 °C MF-R135 1.35 30 40 0.065 0.17 1 Radial Leaded High Temperature (0.350) (0.744) (0.201) 10.2 16.8 5.1 Initial 1 Hour (R1) MF-R160 1.60 30 40 0.055 0.15 1 (0.402) (0.661) (0.201) Resistance Post-Trip Dimensions Ihold Resistance mm/(in) 12.0 18.4 5.1 MF-R185 1.85 30 40 0.040 0.11 1 Model Amperes V max.