Temperature Sensors - NTC Thermistors

Part Number	Description / PDF	Quantity
NTCDS3SG104HC3NB TDK Corporation	NTC AXIAL LEAD, 3X1.8, 100K/3%,	200
NHQMM203B380T5 Thermometrics (Amphenol Advanced Sensors)	THERMISTOR NTC 20KOHM 4000K 0603	0
ND03M00472J-- Elco (AVX)	THERM NTC 4.7KOHM 3950K DISC	0
NCP21XW223J03RA TOKO / Murata	THERMISTOR NTC 22KOHM 3950K 0805	10500
NTCLE100E3223HT1A Vishay BC Components/Beyshlag/Draloric	NTC CU 0.6 LD CODED 22K 3% 1E	0
NC20MC0121JBA Elco (AVX)	THERMISTOR NTC 120OHM 3910K 1206	0
NTCLE100E3473HB0A Vishay BC Components/Beyshlag/Draloric	NTC CU 0.6 LD CODED 47K 3%	0
B57540G1104F000 TDK EPCOS	THERM NTC 100KOHM 4072K BEAD	1736
120-202EAJ-Q01 Honeywell Sensing and Productivity Solutions	THERMISTOR NTC 2KOHM 3518K PROBE	0
NTCC200E4203JT Vishay BC Components/Beyshlag/Draloric	THERMISTOR NTC 20KOHM 3865K DIE	130
B57891M0104J000 TDK EPCOS	THERM NTC 100KOHM 4450K DISC	1949
NTCLE100E3101JT2A Vishay BC Components/Beyshlag/Draloric	NTC CU 0.6 LD CODED 100R 5% 2E	0
140-103LAG-RB1 Honeywell Sensing and Productivity Solutions	THERMISTOR NTC 10KOHM 3887K DISC	40
NTCS0402E3214SMT Vishay BC Components/Beyshlag/Draloric	THERM NTC 210KOHM 3590K 0402	53838
04M4702SFC3 Vishay BC Components/Beyshlag/Draloric	NTC THERMISTORS	0
RA473K0J Wickmann / Littelfuse	THERMISTOR NTC 47KOHM 4000K 0402	0
NTHS0805N01N4702KU Vishay / Dale	THERMISTOR NTC 47KOHM 3964K 0805	0
NTHS1206N17N1503KU Vishay / Dale	THERM NTC 150KOHM 4064K 1206	0
ERT-J0ER472J Panasonic	THERM NTC 4.7KOHM 4250K 0402	10238
ERT-J0ET332H Panasonic	MULTILAYER NTC CHIP THERMISTOR	9887

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.