Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57551G1303G005 TDK EPCOS	THERMISTOR NTC 30KOHM 3973K BEAD	0
B57020M2502A001 TDK EPCOS	THERMISTOR NTC 5KOHM 3980K PROBE	0
B57232V5103H360 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0402	0
B57251V5103J060 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0402	26951
B57234S0259M000 TDK EPCOS	THERMISTOR NTC 2.5OHM 2800K	736
B57891M1102K000 TDK EPCOS	THERMISTOR NTC 1KOHM 3930K DISC	0
B57621C5472J062 TDK EPCOS	THERMISTOR NTC	1981
B57421V2332H062 TDK EPCOS	THERM NTC 3.3KOHM 3940K 0805	0
B57861S0303H040 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	1078
B57332V5103F360 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	87664
B57540G1103F000 TDK EPCOS	THERMISTOR NTC 10KOHM 3478K BEAD	7881
B57150K1242J000 TDK EPCOS	THERM NTC 120KOHM 4170K COIN	0
B57164K0154K052 TDK EPCOS	THERM NTC 150KOHM 4600K DISC	0
B57354V5104J160 TDK EPCOS	NTC THERMISTOR 0603 100K J60 B-4	0
B57358V2104H360 TDK EPCOS	NTC THERMISTOR 0603 100K H60 B-4	0
B57371V2103J060 TDK EPCOS	THERMISTOR NTC 10KOHM 4386K 0603	16
B57164K0332K000 TDK EPCOS	THERM NTC 3.3KOHM 3950K DISC	0
B57471V2103J062 TDK EPCOS	THERMISTOR NTC 10KOHM 4386K 0805	4716
B57374V2104F060 TDK EPCOS	THERM NTC 100KOHM 4386K 0603	4240
B57164K0470K052 TDK EPCOS	THERMISTOR NTC 47OHM 2900K 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.