Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57869S0303F140 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	0
B57401V2472H062 TDK EPCOS	THERM NTC 4.7KOHM 3590K 0805	0
B57891M0333J000 TDK EPCOS	THERMISTOR NTC 33KOHM 4300K DISC	4129
B57875S0103F151 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	0
B57164K0151J052 TDK EPCOS	THERMISTOR NTC 150OHM 3200K DISC	0
B57045K0473K000 TDK EPCOS	THERMISTOR NTC 47KOHM 4450K STUD	1350
B57358V2473H560 TDK EPCOS	THERMISTOR NTC 47KOHM 4050K 0603	0
B57343V5103F360 TDK EPCOS	NTC THERMISTOR 0603 10K F60 B-33	5080
B57560G1104F000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	571
B57442V5472J062 TDK EPCOS	THERM NTC 4.7KOHM 3590K 0805	0
B57550G0503F000 TDK EPCOS	THERMISTOR NTC 50KOHM 3992K BEAD	1605
B57471V2103H062 TDK EPCOS	THERMISTOR NTC 10KOHM 4386K 0805	0
B57234S0109M000 TDK EPCOS	THERMISTOR NTC 1OHM 2600K	537
B57211V2472J60 TDK EPCOS	THERM NTC 4.7KOHM 3500K 0402	0
B57234S0229M000 TDK EPCOS	THERMISTOR NTC 2.2OHM 2800K	826
B58100A0507A000 TDK EPCOS	THERMISTOR NTC 10KOHM CLIP	0
B57551G0202G000 TDK EPCOS	THERMISTOR NTC 2KOHM 3420K BEAD	0
B57250V2104F360 TDK EPCOS	THERMISTOR NTC 100KOHM 4250K	0
B57891S0103J008 TDK EPCOS	THERMISTOR NTC 10K OHM RADIAL,5%	0
B57863S0302F040 TDK EPCOS	THERMISTOR NTC 3KOHM 3988K BEAD	657

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.