Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57863S0302G040 TDK EPCOS	THERMISTOR NTC 3KOHM 3988K BEAD	0
B57551G0502G000 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	0
B57234S0220M051 TDK EPCOS	THERMISTOR NTC 22OHM 3300K	0
B57471V2474H062 TDK EPCOS	THERM NTC 470KOHM 4386K 0805	0
B57321V2222J060 TDK EPCOS	THERM NTC 2.2KOHM 3940K 0603	1975
B57867S104H140 TDK EPCOS	THERM NTC 100KOHM 4540K BEAD	0
B57421V2103J062 TDK EPCOS	THERMISTOR NTC 10KOHM 3940K 0805	21725
B57867S0302H140 TDK EPCOS	THERMISTOR NTC 3KOHM 3988K BEAD	0
B57421V2223J62 TDK EPCOS	THERMISTOR NTC 22KOHM 3940K 0805	479
B57871S0303F000 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K BEAD	0
B57550G104J TDK EPCOS	THERM NTC 100KOHM 4000K BEAD	503
B57871S0103H001 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	0
B57234S0400M000 TDK EPCOS	THERMISTOR NTC 40OHM 3450K	311
B57358V2104J360 TDK EPCOS	NTC THERMISTOR 0603 100K J60 B-4	0
B57541G1103H005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B58100A0414A000 TDK EPCOS	THERM NTC 1.465KOHM 3670K PROBE	8
B57234S0150M051 TDK EPCOS	THERMISTOR NTC 15OHM 3000K	1
B57861S0503J040 TDK EPCOS	THERMISTOR NTC 50KOHM 3760K BEAD	0
B57164K0223K000 TDK EPCOS	THERMISTOR NTC 22KOHM 4300K DISC	2000
B57891S0502F008 TDK EPCOS	THERMISTOR NTC 5KOHM 3980K DISC	2970

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.