Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57550G1103F005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	959
B58100A0406A000 TDK EPCOS	THERMISTOR NTC 10KOHM 4006K CLIP	0
B57356V5473J160 TDK EPCOS	THERMISTOR NTC 47KOHM 4050K 0603	0
B57500M0103A005 TDK EPCOS	THERM NTC 10KOHM 3988K PROBE	847
B57164K0101K000 TDK EPCOS	THERMISTOR NTC 100OHM 3200K DISC	2934
B57234S0221M051 TDK EPCOS	THERMISTOR NTC 220OHM 3900K	838
B57321V2223J060 TDK EPCOS	THERMISTOR NTC 22KOHM 3940K 0603	4000
B57621C5102K062 TDK EPCOS	THERMISTOR NTC 1KOHM 3420K 1206	1318
B57871S0103F002 TDK EPCOS	THERMISTOR NTC 10KOHM 3460K BEAD	4472
B57891M0473J000 TDK EPCOS	THERMISTOR NTC 47KOHM 3980K DISC	2000
B57891S0222H008 TDK EPCOS	THERM NTC 2.2KOHM 3560K DISC	0
B57352V5104J360 TDK EPCOS	THERM NTC 100KOHM 4386K 0603	2678
B57550G0203F000 TDK EPCOS	THERMISTOR NTC 20KOHM 3970K BEAD	425
B57551G1103G000 TDK EPCOS	THERMISTOR NTC 10KOHM 3478K BEAD	0
B57891M0223J000 TDK EPCOS	THERMISTOR NTC 22KOHM 4300K DISC	1949
B57045K0154K000 TDK EPCOS	THERM NTC 150KOHM 4600K STUD	0
B57343V5103H360 TDK EPCOS	NTC THERMISTOR 0603 10K H60 B-36	0
B57550G1103H005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B57164K0689K000 TDK EPCOS	THERMISTOR NTC 6.8OHM 2900K DISC	0
B57881S0123J000 TDK EPCOS	THERMISTOR NTC 12KOHM 3760K 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.