Analog Technologies ATH20K1R8B3950K Ultra-Stable Axial Leaded Thermistor
Product Overview
The Analog Technologies ATH20K1R8B3950K is an ultra-stable axial-leaded thermistor designed for precise temperature sensing and control. Featuring glass encapsulation for long-term stability and reliability, it offers a wide operating temperature range from -55C to 250C, high resistance accuracy of 1%, and a quick response time of 20 seconds. Its compact size (1.8mm x 3.7mm) and tin-plated copper-clad steel leads provide enhanced mechanical stability and conductivity. This RoHS compliant component is ideal for cost-sensitive temperature sensing applications in automotive electronics, industrial electronics, home appliances, battery management systems, and consumer electronics, where accurate and reliable temperature measurement is critical.
Product Attributes
- Brand: Analog Technologies, Inc.
- Product Type: Ultra-Stable Axial Leaded Thermistor
- Encapsulation: Glass
- Leads: Tin-plated Copper-Clad Steel Wire
- Compliance: 100% Lead (Pb)-free and RoHS Compliant
- Certifications: IEC60068-2-21, IEC60068-2-20
Technical Specifications
| Parameter | Symbol | Value |
|---|---|---|
| Nominal Resistance @ 25C | R25 | 20K 1% |
| B Value @ 25C /50C | B25/50 | 3950K 1% |
| Thermistor Diameter | DT | 1.8 0.2mm |
| Thermistor Length | LT | 3.7 0.3mm |
| Lead Diameter | DL | 0.5 0.05mm |
| Lead Length | LL | 28 1mm |
| Dissipation Factor | th | 2mW/C |
| Insulation Resistance | Ris | 500M |
| Maximum Power @ 25C | Pmax | 50mW |
| Time Constant | c | 20s (in still air @5~25C) |
| Operating Temperature Range | -55C to 250C | |
| Stability | <0.1C/year | |
| Terminal Pull Strength and Duration | Pull Strength: 51N, Time Duration: 101s; R25/R25 2% | |
| Solderability | Temperature: 245C 5C, Time Duration: 2 ~ 3s; Coverage area 95% | |
| Withstand Soldering Temperature | Solder Pot Temperature: 260C 5C, Immerse leads 6mm away from thermistor body, Time Duration: 5 1s; R25/R25 2% | |
| Humidity and Heat Sustainability | Temperature: 40C 2C, Humidity: 93% 2%, Time Duration: 500hrs; R25/R25 2% | |
| Thermal Cycling Sustainability | -55C 30min25C 5min250C 30min25C 5min, 5 cycles; R25/R25 2% | |
| High Temperature Storage Sustainability | Temperature: 250C 5C, Time Duration: 1000hrs; R25/R25 2% | |
| Low Temperature Storage Sustainability | Temperature: -55C, Time Duration: 1000hrs; R25/R25 2% |
Part Number Convention
ATH - Company Code (Analog Technologies, Inc.)
20K - Resistance @ 25C (R25 = 20k)
1R8 - Diameter (1R8 = 1.8mm, R = Decimal Point)
B3950K - B Value (B25/50 = 3950K)
Handling and Storage Recommendations
Storage:
- Store in original packaging between -25C to +45C with relative humidity <75% (average) and max 95%. Avoid dew precipitation.
- Do not expose to heat or direct sunlight during storage.
- Avoid storing in environments with corrosive gases (SOx, Cl, etc.).
- Use thermistors as soon as possible after opening factory seals.
- Recommended soldering within 12 months (SMDs) / 24 months (leaded) after shipment.
- Prevent components from being dropped.
- Use gloves; do not touch with bare hands.
- Prevent contamination of the thermistor surface.
- Use resin-type or non-activated flux.
- Ensure proper preheating to avoid ceramic cracks.
- Rapid cooling by dipping in solvent is not recommended.
- Completely remove flux residue after soldering.
Notice
Products and specifications are subject to change without prior notice. ATI warrants products to perform according to specifications for one year from the date of sale, except when damaged due to excessive abuse. Customers are responsible for evaluating product suitability for their applications. ATI assumes no liability for applications assistance or customer product design. Obtain the latest information before placing orders.
2401121843_ATI-ATH20K1R8B3950K_C20606750.pdf
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