Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57861S0302F040 TDK EPCOS	THERMISTOR NTC 3KOHM 3988K BEAD	406
B57551G1104H000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	0
B57550G0502F000 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	1080
B57820M0102A003 TDK EPCOS	THERMISTOR NTC 1KOHM 3560K COIN	0
B57541G1104F000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	0
B57250V2473J560 TDK EPCOS	THERMISTOR NTC 47KOHM 4050K 0402	0
B57891M0472K000 TDK EPCOS	THERM NTC 4.7KOHM 3980K DISC	3570
B57891M0334K000 TDK EPCOS	THERM NTC 330KOHM 4830K DISC	0
B57867S0202J140 TDK EPCOS	THERMISTOR NTC 2KOHM 3560K BEAD	0
B57221V2472K60 TDK EPCOS	THERM NTC 4.7KOHM 3940K 0402	0
B57881S0303F000 TDK EPCOS	THERMISTOR NTC 30KOHM 3964K DISC	0
B57541G1103G005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B57541G1503G005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B57875S0103H001 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	0
B57164K0221J000 TDK EPCOS	THERMISTOR NTC 220OHM 3200K DISC	2065
B57891M0102K000 TDK EPCOS	THERMISTOR NTC 1KOHM 3930K DISC	6900
B57891S0203F008 TDK EPCOS	THERMISTOR NTC 20KOHM 4300K DISC	6449
B57862S0103F040 TDK EPCOS	THERMISTOR NTC 10KOHM 3988K BEAD	1694
B57550G1303F000 TDK EPCOS	THERMISTOR NTC 30KOHM 3973K BEAD	0
B57540G1104F000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	1736

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.