Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57164K0223J000 TDK EPCOS	THERMISTOR NTC 22KOHM 4300K DISC	73
B57885S0303F000 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K DISC	0
B58100A0506A000 TDK EPCOS	THERMISTOR NTC 10KOHM 3497K CLIP	335
B57234S0221M000 TDK EPCOS	THERMISTOR NTC 220OHM 3900K	382
B57355V5104J360 TDK EPCOS	NTC THERMISTOR 0603 100K J60 B-4	0
B57421V2473J062 TDK EPCOS	THERMISTOR NTC 47KOHM 3940K 0805	6300
B57551G1103F005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	585
B57164K0334K000 TDK EPCOS	THERM NTC 330KOHM 5000K DISC	0
B57560G0502F000 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	3386
B57891M0472J000 TDK EPCOS	THERM NTC 4.7KOHM 3980K DISC	284
B57164K0221J052 TDK EPCOS	THERMISTOR NTC 220OHM 3200K DISC	0
B57331V2103J060 TDK EPCOS	THERMISTOR NTC 10KOHM 4390K 0603	0
B57352V5104J060 TDK EPCOS	THERM NTC 100KOHM 4386K 0603	2568
B57550G0303F000 TDK EPCOS	THERMISTOR NTC 30KOHM 3992K BEAD	0
B57885S0103F002 TDK EPCOS	THERMISTOR NTC 10KOHM 3460K DISC	0
B57301K0103A003 TDK EPCOS	THERM NTC 10KOHM 3988K PROBE	316
B57164K0154J000 TDK EPCOS	THERM NTC 150KOHM 4600K DISC	0
B57330V2103F260 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	43486
B57332V5103J360 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	43637
B57861S0502F040 TDK EPCOS	THERMISTOR NTC 5KOHM 3988K BEAD	2935

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.