Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57250V2104J360 TDK EPCOS	THERM NTC 100KOHM 4250K 0402	0
B57164K0680K053 TDK EPCOS	THERMISTOR NTC 68OHM 2900K DISC	0
B57164K0682K000 TDK EPCOS	THERM NTC 6.8KOHM 4200K DISC	90
B57321V2473H060 TDK EPCOS	THERMISTOR NTC 47KOHM 3940K 0603	3390
B57861S0303F045 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	448
B57251V5472J060 TDK EPCOS	THERM NTC 4.7KOHM 3940K 0402	0
B57164K0152J000 TDK EPCOS	THERM NTC 1.5KOHM 3900K DISC	1328
B57164K0153J052 TDK EPCOS	THERMISTOR NTC 15KOHM 4300K DISC	0
B57885S0123J000 TDK EPCOS	THERMISTOR NTC 12KOHM 3760K DISC	0
B57354V5104H160 TDK EPCOS	NTC THERMISTOR 0603 100K H60 B-4	0
B57540G1303G000 TDK EPCOS	THERMISTOR NTC 30KOHM 3973K BEAD	0
B57891M0222J000 TDK EPCOS	THERM NTC 2.2KOHM 3900K DISC	0
B57301V2103J060 TDK EPCOS	THERMISTOR NTC 10KOHM 3590K 0603	0
B57234S0100M000 TDK EPCOS	THERMISTOR NTC 10OHM 3060K	597
B57703M0103A019 TDK EPCOS	THERM NTC 10KOHM 3988K RING LUG	4390
B57371V2682J060 TDK EPCOS	THERM NTC 6.8KOHM 4386K 0603	0
B57276K0123A024 TDK EPCOS	THERM NTC 12KOHM 3760K PROBE	635
B57861S0103H040 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	798
B57800K0103A001 TDK EPCOS	THERM NTC 10KOHM 3988K PROBE	354
B57451V5473H062 TDK EPCOS	THERMISTOR NTC 47KOHM 3940K 0805	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.