Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57231V2473K60 TDK EPCOS	THERMISTOR NTC 47KOHM 4390K 0402	0
B57471V2473J062 TDK EPCOS	THERMISTOR NTC 47KOHM 4386K 0805	5437
B57869S0303G140 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	0
B57471V2223J062 TDK EPCOS	THERMISTOR NTC 22KOHM 4386K 0805	3888
B57256V5473F360 TDK EPCOS	THERMISTOR NTC 47KOHM 4050K 0402	2751
B57471V2474J062 TDK EPCOS	THERM NTC 470KOHM 4386K 0805	1263
B57234S0330M000 TDK EPCOS	THERMISTOR NTC 33OHM 3300K	322
B57867S0103F140 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	306
B58100A598A TDK EPCOS	THERM NTC 10KOHM 3497K MODULE	0
B57864S0502F040 TDK EPCOS	THERMISTOR NTC 5KOHM 3988K BEAD	0
B57321V2473J060 TDK EPCOS	THERMISTOR NTC 47KOHM 3940K 0603	1600
B57540G1104G000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	0
B57421V2153J062 TDK EPCOS	THERMISTOR NTC 15KOHM 3940K 0805	0
B57471V2472H062 TDK EPCOS	THERM NTC 4.7KOHM 4386K 0805	0
B57881S0103H001 TDK EPCOS	THERMISTOR NTC 10KOHM 3980K DISC	0
B57234S0709M000 TDK EPCOS	THERMISTOR NTC 7OHM 3000K	610
B57551G1104G000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	0
B57875S0103F154 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	0
B57864S0282H040 TDK EPCOS	THERM NTC 2.8KOHM 3988K BEAD	0
B57621C5103K062 TDK EPCOS	THERMISTOR NTC	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.