Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
NXRT15XH103FA1B030 TOKO / Murata	THERMISTOR NTC 10KOHM 3380K BEAD	0
NXFT15XV103FA2B140 TOKO / Murata	THERMISTOR NTC 10KOHM 3936K BEAD	0
NCP03WL154E05RL TOKO / Murata	THERM NTC 150KOHM 4485K 0201	0
NCP03XV103E05RL TOKO / Murata	THERMISTOR NTC 10KOHM 3900K 0201	0
NCU18XH103D6SRB TOKO / Murata	SENSOR THERMISTOR NTC	2935
NCP15XH103E03RC TOKO / Murata	THERMISTOR NTC 10KOHM 3380K 0402	5823
NXRT15WF104FA5B045 TOKO / Murata	THERM NTC 100KOHM 4250K BEAD	0
NXRT15XV502FA1B020 TOKO / Murata	THERMISTOR NTC 5KOHM 3936K BEAD	0
NXRT15WB333JA1B030 TOKO / Murata	LEADED NTC THERMISTOR	0
NCU18XH103J6SRB TOKO / Murata	SENSOR THERMISTOR NTC	2606
NXRT15WB473FA1B030 TOKO / Murata	THERMISTOR NTC 47KOHM 4050K BEAD	4514
NCP18XW472J03RB TOKO / Murata	THERM NTC 4.7KOHM 3950K 0603	1687
NCP18XM331J03RB TOKO / Murata	THERMISTOR NTC 330OHM 3500K 0603	0
NCP15XW152J03RC TOKO / Murata	THERM NTC 1.5KOHM 3950K 0402	6130
NCP18XW152J03RB TOKO / Murata	THERM NTC 1.5KOHM 3950K 0603	0
NCP18XQ681J03RB TOKO / Murata	THERMISTOR NTC 680OHM 3650K 0603	4000
NCP18WM474J03RB TOKO / Murata	THERM NTC 470KOHM 4500K 0603	30318
NCP18XW153J03RB TOKO / Murata	THERMISTOR NTC 15KOHM 3950K 0603	15437
NXRT15XM202EA1B030 TOKO / Murata	THERMISTOR NTC 2KOHM 3500K BEAD	0
NCP15XM472J03RC TOKO / Murata	THERM NTC 4.7KOHM 3500K 0402	16039

Temperature Sensors - NTC Thermistors

1. Overview

NTC (Negative Temperature Coefficient) thermistors are temperature-sensitive resistors whose resistance decreases with increasing temperature. This semiconductor ceramic device utilizes metal oxide materials to achieve precise temperature measurement and control. As a fundamental component in thermal management systems, NTC thermistors play critical roles in modern electronics, automotive engineering, and industrial automation due to their high sensitivity ( : 2000-5000 K) and accuracy ( 0.1 C to 5 C).

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
Bead Thermistors	Small size ( 0.5-5mm), fast response (<50ms), glass-encapsulated	Medical probes, liquid temperature monitoring
Disk Thermistors	Higher power rating, epoxy-coated, axial leads	Power supply thermal protection, HVAC systems
Chip Thermistors	SMD packaging, low profile (0.6-3.2mm), RoHS compliant	Smartphone thermal management, wearable devices
Glass-Encapsulated	Hermetic seal, corrosion resistance, operating temp: -50 C to +300 C	Automotive battery monitoring, aerospace sensors

3. Structure and Composition

Typical NTC thermistor construction includes:

Semiconductive ceramic core (Mn-Ni-Co-Ox system)
Platinum alloy electrode layers (sintered or plated)
Protective epoxy/glass encapsulation (IP67 rated)
Lead wires (Cu/Ni alloy, 26-34 AWG)

Manufacturing process involves powder synthesis at 1500 C, isostatic pressing, and controlled atmosphere sintering to achieve desired R-T characteristics.

4. Key Technical Specifications

Parameter	Description	Significance
Rated Resistance (R25)	Resistance at 25 C (100 -10M range)	System compatibility, signal conditioning design
B-Value (K)	Material constant (2000-5000K)	Determines sensitivity across operating range
Tolerance	Resistance deviation ( 1% to 15%)	Affects measurement accuracy
Operating Temp Range	-100 C to +600 C (varies by type)	Environmental suitability
Dissipation Factor	mW/ C (self-heating coefficient)	Power consumption and stability considerations

5. Application Fields

Primary industries utilizing NTC thermistors:

Industrial: Process control ( 0.5 C accuracy), motor protection
Consumer Electronics: Battery management (Li-ion charging), smart thermostats
Medical: Patient monitoring (Class F accuracy), lab equipment
Automotive: Battery pack thermal monitoring (ISO 14001 compliance), ECU protection

Notable application example: Tesla Model S battery management system uses 48-channel NTC array for cell temperature monitoring ( 1 C accuracy).

6. Leading Manufacturers and Products

Manufacturer	Key Products	Technical Highlights
Murata Electronics	NXFT Series	Automotive-grade (AEC-Q200), 0.5 C accuracy, -50 C to +150 C range
TE Connectivity	NTCLE Series	Medical certification (IEC 60601), 3.2mm chip format
Vishay Beyschlag	NTCAl Series	Aluminum housing, 50W power handling, IP68 rating

7. Selection Guidelines

Key considerations for NTC thermistor selection:

Resistance-Temperature curve matching application requirements
Environmental factors: humidity (IP rating), vibration (automotive shock specs)
Electrical parameters: operating current (self-heating effects)
Form factor constraints (SMD vs through-hole)
Calibration requirements (standard vs customized R-T tables)

Recommend verifying long-term stability (aging rate <0.2%/year) and RoHS compliance for production applications.

8. Industry Trends

Emerging developments include:

Micro-NTC fabrication (MEMS-based, <0.1mm chips)
High-temperature stability improvements (up to 600 C operation)
Integration with wireless sensor networks (Zigbee/LoRa compatibility)
AI-enhanced linearization algorithms (reducing external circuit complexity)

Market growth projected at 8.2% CAGR through 2027 driven by EV battery management demands.