Temperature Sensors - NTC Thermistors

Image	Part Number	Description / PDF	Quantity	Rfq
	B57231V2223J60 TDK EPCOS	THERMISTOR NTC 22KOHM 4390K 0402	0
	B57540G1502H000 TDK EPCOS	THERMISTOR NTC 5KOHM BEAD	0
	B57619C2103J60 TDK EPCOS	THERMISTOR NTC 10KOHM 0603	0
	B57223V2103J060 TDK EPCOS	THERMISTOR NTC 10K OHM B-4000 04	0
	B58100A0081A000 TDK EPCOS	THERMISTOR NTC	0
	B57620C0103A162 TDK EPCOS	THERMISTOR NTC 10K OHM B-3730 08	0
	B57233V2333J060 TDK EPCOS	THERMISTOR NTC 33K OHM B-4500 04	0
	B57321V2471J60 TDK EPCOS	THERMISTOR NTC 470OHM 3940K 0603	0
	B57619C2103J060 TDK EPCOS	THERMISTOR NTC 10K OHM B-3560 06	0
	B57321V2152K60 TDK EPCOS	THERM NTC 1.5KOHM 3940K 0603	0
	B57431V2104A062 TDK EPCOS	THERMISTOR NTC 100K OHM B-4500 0	0
	B57331V2473A060 TDK EPCOS	THERMISTOR NTC 47K OHM B-4500 06	0
	B57620C0472J162 TDK EPCOS	THERMISTOR NTC 4.7K OHM B-3530 0	0
	B57620C0153J062 TDK EPCOS	THERMISTOR NTC 15K OHM B-3900 08	0
	B57331V2332J60 TDK EPCOS	THERM NTC 3.3KOHM 4390K 0603	0
	B57620C2103A272 TDK EPCOS	THERMISTOR NTC 10K OHM B-3560 08	0
	B57331V2153J60 TDK EPCOS	THERMISTOR NTC 15KOHM 4390K 0603	0
	B57619C473J60 TDK EPCOS	THERMISTOR NTC 47KOHM 3860K 0603	0
	B57324V2103J160 TDK EPCOS	THERMISTOR NTC 10K OHM B-4000 06	0
	B57431V2473A062 TDK EPCOS	THERMISTOR NTC 47K OHM B-4500 08	0

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.