Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
B57861S0104H040 TDK EPCOS	THERM NTC 100KOHM 4540K BEAD	0
B57045K0472K000 TDK EPCOS	THERM NTC 4.7KOHM 3950K STUD	0
B57561G1103H005 TDK EPCOS	THERMISTOR NTC 10KOHM 3612K BEAD	0
B57561G1103F000 TDK EPCOS	THERMISTOR NTC 10KOHM 3478K BEAD	485
B57540G0502H002 TDK EPCOS	THERMISTOR NTC 5KOHM 3480K BEAD	0
B57352V5473H060 TDK EPCOS	THERMISTOR NTC 47KOHM 4386K 0603	0
B57330V2103J260 TDK EPCOS	THERMISTOR NTC 10KOHM 3380K 0603	0
B57820M0841A004 TDK EPCOS	THERMISTOR NTC 840OHM 3550K COIN	0
B57164K0103J000 TDK EPCOS	THERMISTOR NTC 10KOHM 4300K DISC	14751
B57464S0400M000 TDK EPCOS	THERMISTOR NTC 40OHM	456
B57421V2102H062 TDK EPCOS	THERMISTOR NTC 1KOHM 3940K 0805	480
B57621C5103J062 TDK EPCOS	THERMISTOR NTC 10KOHM 3470K 1206	9825
B57234S0400M051 TDK EPCOS	THERMISTOR NTC 40OHM 3450K	695
B57891M0224K000 TDK EPCOS	THERM NTC 220KOHM 4600K DISC	0
B57352V5104F360 TDK EPCOS	THERM NTC 100KOHM 4386K 0603	3805
B57164K0220K000 TDK EPCOS	THERMISTOR NTC 22OHM 2900K DISC	0
B57401V2103H062 TDK EPCOS	THERMISTOR NTC 10KOHM 3590K 0805	2758
B57164K0682J052 TDK EPCOS	THERM NTC 6.8KOHM 4200K DISC	0
B57421V2152H062 TDK EPCOS	THERM NTC 1.5KOHM 3940K 0805	0
B57560G0503F000 TDK EPCOS	THERMISTOR NTC 50KOHM 3992K BEAD	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.