NTC (Negative Temperature Coefficient) Thermistors

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Surface-Mount Thermistors

Littelfuse Surface-Mount Thermistors offer a 0.7Ω to 500,000Ω resistance range and a maximum operating range of -55°C to +220°C. This Littelfuse portfolio includes end-banded chip thermistors, leadless top- and bottom-terminated chip thermistors, inrush current limiters (power thermistors), and more. These surface-mount modules are ideal for a wide variety of applications.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (GBP) Filter the results in the table by unit price based on your quantity.	Qty.	Series	B Parameter	Resistance	Power Rating	Tolerance	Mounting Style	Termination Style	Minimum Operating Temperature	Maximum Operating Temperature	Package/Case	Diameter	Length	Width	Height	Packaging
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 100K OHM 0.5C MELF HM104J1A Littelfuse 1: £1.13 5,211In Stock	Mfr. Part No. HM104J1A Mouser Part No 576-HM104J1A	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 100K OHM 0.5C MELF Learn More about Littelfuse surface mount thermistors	Datasheet	5,211In Stock	£1.13 £1.03 £0.934 £0.89 View £0.871 £0.788 £0.759 £0.725 £0.67	Min.: 1 Mult.: 1	HM	3892 K	100 kOhms		0.5 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.0603 in	0.135 in	0.0603 in	0.0603 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, US SENSOR WM103J1B Littelfuse 1: £4.26 2,756In Stock	Mfr. Part No. WM103J1B Mouser Part No 803-WM103J1B	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, US SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	2,756In Stock	£4.26 £3.79 £3.41 £3.17 View £3.03 £2.89 £2.65 £2.56	Min.: 1 Mult.: 1	WM	3892 K	10 kOhms		1 C	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 2K OHM 10% MELF SM202F1K Littelfuse 1: £1.48 459In Stock	Mfr. Part No. SM202F1K Mouser Part No 576-SM202F1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 2K OHM 10% MELF Learn More about Littelfuse surface mount thermistors	Datasheet	459In Stock	£1.48 £1.15 £0.96 £0.943 View £0.856 £0.744 £0.711 £0.674	Min.: 1 Mult.: 1	SM	3419 K	2 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors 1K OHM +/-10% SM102B1K Littelfuse 1: £1.20 691In Stock	Mfr. Part No. SM102B1K Mouser Part No 803-SM102B1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors 1K OHM +/-10% Learn More about Littelfuse surface mount thermistors	Datasheet	691In Stock	£1.20 £1.15 £0.96 £0.943 View £0.856 £0.766 £0.719 £0.664	Min.: 1 Mult.: 1	SM	2941 K	1 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 5K OHM 5% 0805 SMT KR502F0J Littelfuse 1: £0.555 3,475In Stock	Mfr. Part No. KR502F0J Mouser Part No 576-KR502F0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 5K OHM 5% 0805 SMT Learn More about Littelfuse surface mount thermistors	Datasheet	3,475In Stock	£0.555 £0.526 £0.492 £0.47 View £0.448 £0.402 £0.378 £0.324	Min.: 1 Mult.: 1	KR	3550 K	5 kOhms	300 mW	5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	0805 (2012 metric)		0.0787 in	0.0492 in	0.05 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors C THERMISTOR 10K OHM 5% 0603 SMT RB103J0J Littelfuse 1: £0.346 3,845In Stock	Mfr. Part No. RB103J0J Mouser Part No 576-RB103J0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors C THERMISTOR 10K OHM 5% 0603 SMT Learn More about Littelfuse surface mount thermistors	Datasheet	3,845In Stock	£0.346 £0.32 £0.298 £0.283 View £0.278 £0.253 £0.24 £0.217 £0.201	Min.: 1 Mult.: 1		3976 K	10 kOhms		5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	0603 (1608 metric)		0.063 in	0.0315 in	0.0395 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR SM103J1F Littelfuse 1: £1.33 2,450In Stock 2,500Expected 05/10/2026	Mfr. Part No. SM103J1F Mouser Part No 576-SM103J1F	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	2,450In Stock 2,500Expected 05/10/2026	£1.33 £1.27 £1.07 £1.05 View £0.952 £0.849 £0.751	Min.: 1 Mult.: 1		3892 K	10 kOhms		1 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC 10K OHM +/-1% MM103J1F Littelfuse 1: £0.863 1,992In Stock	Mfr. Part No. MM103J1F Mouser Part No 803-MM103J1F	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC 10K OHM +/-1% Learn More about Littelfuse surface mount thermistors	Datasheet	1,992In Stock	£0.863 £0.826 £0.773 £0.735 View £0.664 £0.639 £0.61 £0.563	Min.: 1 Mult.: 1	MM	3892 K	10 kOhms		1 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.053 in	0.075 in	0.053 in	0.049 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 1M OHM 10% MELF SM105R1K Littelfuse 1: £1.00 118In Stock	Mfr. Part No. SM105R1K Mouser Part No 576-SM105R1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 1M OHM 10% MELF Learn More about Littelfuse surface mount thermistors	Datasheet	118In Stock	£1.00 £0.952 £0.899 £0.856 View £0.826 £0.744 £0.705 £0.687	Min.: 1 Mult.: 1	SM	4140 K	1 mOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR SM303J1K Littelfuse 1: £1.00 349In Stock	Mfr. Part No. SM303J1K Mouser Part No 576-SM303J1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	349In Stock	£1.00 £0.952 £0.899 £0.856 View £0.826 £0.744 £0.711 £0.664	Min.: 1 Mult.: 1	SM	3892 K	30 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.06 in	0.135 in	0.06 in	0.06 in
NTC (Negative Temperature Coefficient) Thermistors NTC 100K OHM +/-1% MM104J1F Littelfuse 1: £0.863 10In Stock 2,000On Order	Mfr. Part No. MM104J1F Mouser Part No 803-MM104J1F	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC 100K OHM +/-1% Learn More about Littelfuse surface mount thermistors	Datasheet	10In Stock 2,000On Order On Order Ship Dates Mfr. No: MM104J1F Stock: 10 Can Dispatch Immediately On Order: 700 Expected 08/10/2026 300 Expected 23/10/2026 1,000 Expected 04/01/2027 Factory Lead Time: 12 Weeks	£0.863 £0.826 £0.773 £0.735 View £0.704 £0.639 £0.61 £0.563	Min.: 1 Mult.: 1	MM	3892 K	100 kOhms		1 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.053 in	0.075 in	0.053 in	0.049 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC 20K OHM +/-1% MM203J1F Littelfuse 1: £0.863 55In Stock	Mfr. Part No. MM203J1F Mouser Part No 803-MM203J1F	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC 20K OHM +/-1% Learn More about Littelfuse surface mount thermistors	Datasheet	55In Stock	£0.863 £0.826 £0.773 £0.735 View £0.664 £0.625 £0.599 £0.563	Min.: 1 Mult.: 1	MM	3892 K	20 kOhms		1 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MicroMELF-2	0.053 in	0.075 in			Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC 10K OHM +/-10% SM103J1K-TR Littelfuse 1: £0.383 2,578In Stock	Mfr. Part No. SM103J1K-TR Mouser Part No 803-SM103J1K-TR	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC 10K OHM +/-10% Learn More about Littelfuse industrial portfolio	Datasheet	2,578In Stock	Cut Tape £0.383 £0.361 £0.338 £0.32 View Reel £0.227 £0.306 £0.276 £0.263 £0.227 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	SM	3892 K	10 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.06 in	0.135 in	0.06 in	0.06 in	Reel, Cut Tape, MouseReel
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR SM502F1K Littelfuse 1: £1.00 103In Stock	Mfr. Part No. SM502F1K Mouser Part No 803-SM502F1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, U.S. SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	103In Stock	£1.00 £0.952 £0.899 £0.856 View £0.826 £0.744 £0.711 £0.664	Min.: 1 Mult.: 1	SM	3419 K	5 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C		0.06 in	0.135 in	0.06 in	0.06 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THRM CHIP 3750 10K 5% TR KR103G0J-TR Littelfuse 1: £0.338 3,219In Stock	Mfr. Part No. KR103G0J-TR Mouser Part No 576-KR103G0J-TR	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THRM CHIP 3750 10K 5% TR Learn More about Littelfuse surface mount thermistors	Datasheet	3,219In Stock	Cut Tape £0.338 £0.318 £0.296 £0.282 View Reel £0.21 £0.268 £0.241 £0.228 £0.21 MouseReel Available	Min.: 1 Mult.: 1 : 3,500															Reel, Cut Tape, MouseReel
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, US SENSO KR104R0J Littelfuse 1: £0.871 3,493In Stock	Mfr. Part No. KR104R0J Mouser Part No 576-KR104R0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR, US SENSO Learn More about Littelfuse surface mount thermistors	Datasheet	3,493In Stock	£0.871 £0.651 £0.52 £0.49 View £0.478 £0.402 £0.378 £0.346	Min.: 1 Mult.: 1	KR	4250 K	100 kOhms	300 mW	5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	0805 (2012 metric)		0.0787 in	0.0492 in	0.05 in
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR US SENSOR BC103J1K Littelfuse 1: £1.82 172In Stock	Mfr. Part No. BC103J1K Mouser Part No 803-BC103J1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR US SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	172In Stock	£1.82 £1.74 £1.63 £1.57 View £1.51 £1.36 £1.33 £1.24	Min.: 1 Mult.: 1	BC	3892 K	10 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 150 C			0.04 in	0.04 in	0.015 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 5% 0603 SMT RB103E0J Littelfuse 1: £0.518 240Expected 07/12/2026	Mfr. Part No. RB103E0J Mouser Part No 576-RB103E0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 5% 0603 SMT Learn More about Littelfuse rb thermistors	Datasheet	240Expected 07/12/2026	£0.518 £0.394 £0.339 £0.327 View £0.278 £0.266 £0.242 £0.23 £0.201	Min.: 1 Mult.: 1	RB	3435 K	10 kOhms	150 mW	5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	0603 (1608 metric)		0.063 in	0.0315 in	0.0395 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 1K OHM 5% 1206 SMT LR102D0J Littelfuse 1: £1.31 250Expected 27/01/2027	Mfr. Part No. LR102D0J Mouser Part No 576-LR102D0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 1K OHM 5% 1206 SMT Learn More about Littelfuse surface mount thermistors	Datasheet	250Expected 27/01/2027	£1.31 £0.978 £0.78 £0.734 View £0.716 £0.601 £0.554 £0.511	Min.: 1 Mult.: 1	LR	3250 K	1 kOhms	400 mW	5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	1206 (3216 metric)		0.126 in	0.063 in	0.05 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K O HM 0.5C MELF HM103J1A Littelfuse 2,500: £0.67 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. HM103J1A Mouser Part No 576-HM103J1A	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K O HM 0.5C MELF Learn More about Littelfuse surface mount thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	£0.67	Min.: 2,500 Mult.: 2,500	HM	3892 K	10 kOhms		0.5 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.0603 in	0.135 in			Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 10% MELF MM103J1K Littelfuse 1: £0.721 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. MM103J1K Mouser Part No 576-MM103J1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 10% MELF Learn More about Littelfuse surface mount thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	£0.721 £0.684 £0.641 £0.611 View £0.585 £0.53 £0.51 £0.47	Min.: 1 Mult.: 1	MM	3892 K	10 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MicroMELF-2	0.053 in	0.075 in	0.053 in	0.049 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors THERMISTOR RA103J0Q-TR Littelfuse 10,000: £0.151 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. RA103J0Q-TR Mouser Part No 576-RA103J0Q-TR	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors THERMISTOR Learn More about Littelfuse surface mount thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	Reel £0.151 £0.15	Min.: 10,000 Mult.: 10,000 : 10,000	RA	3900 K	10 kOhms		1 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C			0.0394 in	0.0197 in	0.028 in	Reel
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 5% 0603 SMT RB103K0J Littelfuse 4,000: £0.203 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. RB103K0J Mouser Part No 576-RB103K0J	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR 10K OHM 5% 0603 SMT Learn More about Littelfuse rb thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	£0.203	Min.: 4,000 Mult.: 4,000	RB	4000 K	10 kOhms	150 mW	5 %	PCB Mount	SMD/SMT	- 40 C	+ 125 C	0603 (1608 metric)		0.063 in	0.0315 in	0.0395 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR SB102F1K Littelfuse 1: £1.37 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. SB102F1K Mouser Part No 576-SB102F1K	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors NTC THERMISTOR Learn More about Littelfuse surface mount thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	£1.37 £1.06 £0.882 £0.863 View £0.788 £0.706 £0.698 £0.627	Min.: 1 Mult.: 1	SB	3419 K	1 kOhms		10 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MELF-2	0.096 in	0.135 in	0.06 in	0.096 in	Bulk
NTC (Negative Temperature Coefficient) Thermistors CUSTOM TEMPERATURE SENSOR SM104J1F Littelfuse 1: £1.67 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. SM104J1F Mouser Part No 576-SM104J1F	Littelfuse	NTC (Negative Temperature Coefficient) Thermistors CUSTOM TEMPERATURE SENSOR Learn More about Littelfuse surface mount thermistors	Datasheet	Non-Stocked Lead-Time 12 Weeks	£1.67 £1.28 £1.07 £1.05 View £0.952 £0.882 £0.834 £0.818 £0.751	Min.: 1 Mult.: 1		3892 K	100 kOhms		1 %	PCB Mount	SMD/SMT	- 55 C	+ 220 C	MiniMELF-2	0.06 in	0.135 in

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