Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57501K0682A002 TDK EPCOS	THERM NTC 6.8KOHM 3988K PROBE	0
B57471V2223H062 TDK EPCOS	THERMISTOR NTC 22KOHM 4386K 0805	0
B57164K0101J000 TDK EPCOS	THERMISTOR NTC 100OHM 3200K DISC	23
B57541G1503F005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B57045K0222K000 TDK EPCOS	THERM NTC 2.2KOHM 3900K STUD	561
B57164K680J1 TDK EPCOS	THERMISTOR NTC 68OHM 2900K DISC	0
B57352V5223J060 TDK EPCOS	THERMISTOR NTC 22KOHM 4386K 0603	15416
B57164K0680K052 TDK EPCOS	THERMISTOR NTC 68OHM 2900K DISC	0
B57500K0103A001 TDK EPCOS	THERM NTC 10KOHM 3988K PROBE	369
B57871S0123F000 TDK EPCOS	THERMISTOR NTC 12KOHM 3760K BEAD	2477
B57541G1104G000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	0
B57891S0104J008 TDK EPCOS	THERM NTC 100KOHM 4450K DISC	0
B57962S282H1 TDK EPCOS	THERM NTC 2.8KOHM 3988K BEAD	0
B57164K0331K000 TDK EPCOS	THERMISTOR NTC 330OHM 3450K DISC	0
B58703M1103A001 TDK EPCOS	RING TONGUE TEMPERATURE SENSOR	670
B57540G0503F000 TDK EPCOS	THERMISTOR NTC 50KOHM 3992K BEAD	4900
B57343V5103J360 TDK EPCOS	NTC THERMISTOR 0603 10K J60 B-36	0
B57861S0303J040 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	0
B57861S0104J040 TDK EPCOS	THERM NTC 100KOHM 4540K BEAD	0
B57227K0333A001 TDK EPCOS	THERM NTC 33KOHM 4300K PROBE	23

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.