Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57164K0224K052 TDK EPCOS	THERM NTC 220KOHM 4600K DISC	0
B57371V2473H060 TDK EPCOS	THERMISTOR NTC 47KOHM 4386K 0603	1624
B57703M0103G040 TDK EPCOS	THERM NTC 10KOHM 3988K RING LUG	2958
B57867S0202F140 TDK EPCOS	THERMISTOR NTC 2KOHM 3560K BEAD	990
B57971S0103F001 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	1567
B57164K0681K000 TDK EPCOS	THERMISTOR NTC 680OHM 3200K DISC	0
B57861S0202J040 TDK EPCOS	THERMISTOR NTC 2KOHM 3560K BEAD	0
B57421V2102J062 TDK EPCOS	THERMISTOR NTC 1KOHM 3940K 0805	9470
B57514K0493A001 TDK EPCOS	THERMISTOR NTC 5KOHM 3988K PROBE	0
B57551G1303F005 TDK EPCOS	THERMISTOR NTC 30KOHM 3973K BEAD	0
B57164K0331J000 TDK EPCOS	THERMISTOR NTC 330OHM 3450K DISC	1390
B57540G0502H000 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	0
B57342V5103J060 TDK EPCOS	THERMISTOR NTC 10KOHM 3590K 0603	0
B57551G0502F000 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	0
B57540G0502F002 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	0
B57891M0103K000 TDK EPCOS	THERMISTOR NTC 10KOHM 3950K DISC	1212
B57332V5103H360 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	0
B57551G1103F000 TDK EPCOS	THERMISTOR NTC 10KOHM 3478K BEAD	0
B57891M0152K000 TDK EPCOS	THERM NTC 1.5KOHM 3560K DISC	0
B57891M0154K000 TDK EPCOS	THERM NTC 150KOHM 4600K 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.