Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57330V2103H260 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	0
B57621C5472K062 TDK EPCOS	THERMISTOR NTC	0
B57234S0479M051 TDK EPCOS	THERMISTOR NTC 4.7OHM 2900K	686
B57867S104J140 TDK EPCOS	THERM NTC 100KOHM 4540K BEAD	0
B57871S0212F000 TDK EPCOS	THERM NTC 2.1KOHM 3560K BEAD	80
B57301V2472J060 TDK EPCOS	THERM NTC 4.7KOHM 3590K 0603	3715
B57891M0474J000 TDK EPCOS	THERM NTC 470KOHM 5000K DISC	0
B57471V2104H062 TDK EPCOS	THERM NTC 100KOHM 4386K 0805	6694
B57871S0123J000 TDK EPCOS	THERMISTOR NTC 12KOHM 3760K BEAD	553
B57650H0824A001 TDK EPCOS	THERMISTOR NTC 5KOHM BEAD	173
B57875S0103F001 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	0
B57540G234H TDK EPCOS	THERM NTC 230KOHM 4240K BEAD	0
B57471V2333J062 TDK EPCOS	THERMISTOR NTC 33KOHM 4386K 0805	9475
B57881S0103H002 TDK EPCOS	THERMISTOR NTC 10KOHM 3460K DISC	0
B57256V5473J360 TDK EPCOS	THERMISTOR NTC 47KOHM 4050K 0402	0
B57891S0203H008 TDK EPCOS	THERMISTOR NTC 20KOHM 4300K DISC	0
B57371V2683H060 TDK EPCOS	THERMISTOR NTC 68KOHM 4386K 0603	0
B57350V2104F460 TDK EPCOS	THERM NTC 100KOHM 4200K 0603	7042
B57881S0212F000 TDK EPCOS	THERM NTC 2.1KOHM 3560K DISC	0
B57164K0153J000 TDK EPCOS	THERMISTOR NTC 15KOHM 4250K DISC	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.