.55 ohm Non-linear Resistors 29

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Part	Manufacturer	Resistor Type	Mounting Type	Resistance	Rated Power Dissipation (P)	Maximum Operating Temperature	Rated Temperature	Thermistor Application	Terminal Placement	Shape (Package)	Packing Method	No. of Terminals	Package Style (Meter)	Rated AC Voltage (URac)	Terminal Shape	Sub-Category	Dimensions	Minimum Operating Temperature	Terminal Finish	Height (Package)	Manufacturer Series	Maximum Circuit RMS Voltage	Operating Voltage	Additional Features	Length (Package)	JESD-609 Code	Reference Standard	Width (Package)	Maximum Circuit DC Voltage
0ZCJ0025AF2E	Bel Fuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel			DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND	TEMPERATURE DEPENDENT RESISTOR	3.5mm x 1.8mm x 0.75mm	-40 Cel	MATTE TIN	.75 mm			24 V	RMIN AT 23 DEG CEL	3.5 mm	e3	AEC-Q200; CUL; TUV; UL	1.8 mm	24 V
1206L025YR	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel	MATTE TIN	1 mm			16 V		3.4 mm	e3	CUL; TUV; UL	1.8 mm
1206L025YRT	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		TEMPERATURE SENSING	DUAL ENDED	RECTANGULAR PACKAGE	TR, 7 INCH	2			WRAPAROUND			-40 Cel	Matte Tin (Sn)							e3
SMD1206B025TF	Yageo	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel		1 mm			16 V	RMIN AT 23 DEG CEL	3.4 mm		CUL; TUV; UL	1.8 mm
0603L020YR	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED	RECTANGULAR PACKAGE	TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel	MATTE TIN	.75 mm			9 V		1.8 mm	e3	CUL; TUV; UL	1 mm	9 V
0ZCJ0025FF2E	Bel Fuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel			DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND	TEMPERATURE DEPENDENT RESISTOR	3.5mm x 1.8mm x 0.75mm	-40 Cel	MATTE TIN	.75 mm			16 V	RMIN AT 23 DEG CEL	3.5 mm	e3	AEC-Q200; CUL; TUV; UL	1.8 mm	16 V
0ZCM0020FF2G	Bel Fuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel			DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel	MATTE TIN	.75 mm			9 V	RMIN AT 23 DEG CEL	1.8 mm	e3	AEC-Q200; CUL; TUV; UL	1 mm	9 V
MF-FSMF020X-2	Bourns	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED	RECTANGULAR PACKAGE	TR, 7 INCH	2	SMT		WRAPAROUND	Non-linear Resistors		-40 Cel	GOLD OVER NICKEL	.65 mm			9 V	RMIN AT 23 DEG CEL	1.85 mm	e4	CUL; TUV; UL	1.05 mm
1206L025/24YR	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel		1 mm			24 V		3.4 mm		CUL; TUV; UL	1.8 mm
MICROSMD050	Littelfuse	PTC THERMISTOR	SURFACE MOUNT	.55 ohm		85 Cel		OVERLOAD PROTECTION	DUAL ENDED	RECTANGULAR PACKAGE	TR	2	SMT		WRAPAROUND			-40 Cel		.62 mm			13.2 V	RESISTANCE VALUE 0.55 OHM AT 20 DEG CEL	3.43 mm			2.8 mm	13.2 V
RF2659-000	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm	.56 W	85 Cel		TEMPERATURE SENSING	RADIAL	DISK PACKAGE	AMMO PACK	2		72 V	WIRE			-40 Cel						RESISTANCE RANGE(MIN-MAX): 0.55-0.86
RXEF040K	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL	DISK PACKAGE	BULK	2	Radial		WIRE			-40 Cel	Matte Tin (Sn) - with Nickel (Ni) barrier	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
60R040XPR	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL	DISK PACKAGE	AMMO PACK	2	Radial		WIRE	Non-linear Resistors		-40 Cel	MATTE TIN	13.5 mm			60 V		7.6 mm	e3	CUL; TUV; UL	3.1 mm
60R040	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel	85 Cel	OVERLOAD PROTECTION	RADIAL	DISK PACKAGE	TR	2			WIRE	Non-linear Resistors		-40 Cel	MATTE TIN		60R			1.29OHMS@20DEGREE		e3
0603L020	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED			2	SMT		WRAPAROUND	Non-linear Resistors		-40 Cel	Matte Tin (Sn)	.75 mm			9 V		1.8 mm	e3	CUL, TUV, UL	1 mm	9 V
1206L025DYRT	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel	85 Cel	TEMPERATURE SENSING	DUAL ENDED	RECTANGULAR PACKAGE	TR, 7 INCH	2			WRAPAROUND			-40 Cel	Matte Tin (Sn)							e3
0603L020YR-A	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED		TR, 7 INCH	2	SMT		WRAPAROUND			-40 Cel	Matte Tin (Sn)	.75 mm			9 V		1.8 mm	e3	CUL, TUV, UL	1 mm	9 V
1206L025WRT	Littelfuse	PTC THERMISTOR	SURFACE MOUNT	.55 ohm		85 Cel		TEMPERATURE COMPENSATION	DUAL	RECTANGULAR PACKAGE	TR, 7 INCH	2			WRAPAROUND			-40 Cel	Matte Tin (Sn)							e3
0603L020-A	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	DUAL ENDED			2	SMT		WRAPAROUND			-40 Cel		.75 mm			9 V		1.8 mm		CUL, TUV, UL	1 mm	9 V
RXEF040K-1	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL			2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040U-AP	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL		AMMO PACK	2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040K-AP	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL		AMMO PACK	2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040K-2	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL		TR, 14.5 INCH	2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040U-1	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL			2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040U	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL		Bulk	2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
RXEF040U-2	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL		TR, 15 INCH	2	Radial		WIRE			-40 Cel	Tin (Sn)	13.5 mm		72 V	72 V	Rmax:0.86 OHMS AT 20 DEG CEL	7.6 mm	e3	CQC; CSA; TUV; UL	3 mm	72 V
60R040XU	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL	DISK PACKAGE	BULK	2	Radial		WIRE	Non-linear Resistors		-40 Cel	MATTE TIN	13.5 mm			60 V		7.6 mm	e3	CUL; TUV; UL	3.1 mm
72R040XPR	Littelfuse	PTC RESETTABLE FUSE	THROUGH HOLE MOUNT	.55 ohm		85 Cel		OVERCURRENT PROTECTION	RADIAL	DISK PACKAGE	AMMO PACK	2	Radial		WIRE	Non-linear Resistors		-40 Cel	TIN	7.6 mm			72 V	Rmax:1.29 OHMS AT 20 DEG CEL	7.6 mm	e3	CUL, TUV, UL	3.1 mm
1206L025	Littelfuse	PTC RESETTABLE FUSE	SURFACE MOUNT	.55 ohm		85 Cel	85 Cel	OVERLOAD PROTECTION	DUAL ENDED	RECTANGULAR PACKAGE	TR, 4 INCH	2			WRAPAROUND			-40 Cel	Matte Tin (Sn)							e3

Non-linear Resistors

Non-linear resistors, also known as varistors or voltage-dependent resistors, are electronic components that exhibit a nonlinear resistance characteristic with respect to the applied voltage. They are primarily used for voltage clamping, surge protection, and transient suppression in electronic circuits.

The resistance of a varistor decreases with an increase in voltage, allowing it to provide a low resistance path for transient currents that exceed a specified threshold. When the voltage level drops below the threshold, the resistance increases, returning the varistor to its high impedance state. This property makes them useful for protecting sensitive electronic components from voltage surges and spikes.

Varistors are available in two types: metal oxide varistors (MOVs) and silicon carbide varistors (SiCVs). MOVs are the most common type, and they can handle a wider range of voltages than SiCVs. SiCVs, on the other hand, can handle higher temperatures and are more suitable for high power applications.

Non-linear resistors are widely used in power supplies, surge protectors, electronic ballasts, motor control circuits, and telecommunication systems. They are available in various package types, including through-hole, surface mount, and radial leaded packages.