Power type NTC thermistor Nanjing Shiheng Elec MF72 22D7 offers stable resistance and high surge current tolerance
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Product Description
Product Overview
The MF72 series of power type NTC thermistors from Nanjing Shiheng Electronics Technology Co., Ltd. are designed for surge current suppression. These components offer reliable performance with a wide operating temperature range and are manufactured under stringent quality management systems. They are suitable for applications requiring protection against inrush currents.
Product Attributes
- Brand: Shiheng
- Product Type: Power Type NTC Thermistor
- Certifications: ISO9001:2008, ISO/TS16949:2009, ISO14001:2004, RoHS, CQC Safety Certification, Jiangsu Province High-tech Product Certification, TUV
- Encapsulation Material: Black Phenolic Resin
- Lead Wire Material: Tinned Copper Wire
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirement |
|---|---|---|---|---|
| 1. Electrical Performance | ||||
| Zero-power resistance at 25 | R25 | Ta=250.5, Test power 0.1mW, Tested in air | 2220% | |
| B value | B25/50 | B=[(TaTb)/(Tb-Ta)]ln(Ra/Rb) | K | 280010% |
| Max. steady-state current | I max | A | 0.6 | |
| Max. allowable capacitance | CT | 240Vac | F | 68 |
| Dissipation factor | mW/ | 9 | ||
| Thermal time constant | sec | 27 | ||
| Withstand voltage | 500V/AC, 1min | No breakdown or flashover | ||
| Insulation resistance | 500V/DC, 1min | M | 500 | |
| Operating temperature range | -40 ~ 130 | |||
| Max. rated power | Pmax | W | 1 | |
| Resistance-temperature curve | See Figure 1 | |||
| Volt-ampere curve | See Figure 2 | |||
| 2. Reliability | ||||
| Lead strength | Tensile force: 101 sec | N | 0.5<d0.8: 10; 0.8<d1.25: 20 (No visible damage, R/R25%) | |
| Solderability | Temperature 2455, time 2-3 sec | 95% tinning area | ||
| Resistance to soldering heat | Tin pot temperature: 2605, immersion depth 6mm from body, time 101 sec | R/R25% | ||
| Steady damp heat | Temperature: 402, Humidity: 932%, Time: 500 hours | R/R25% | ||
| Temperature rapid change | -40 30min25 5min130 30min25 5min, 5 cycles | R/R25% | ||
| High temperature storage | Temperature: 1305, Time: 1000 hours | R/R25% | ||
| Max. steady-state current endurance | Continuous application of max. steady-state current at room temperature, 50024h | R/R25% | ||
| Max. capacitance endurance | Apply max. allowable capacitance, intermittently close 50ms, open 5 times thermal time constant per cycle, 1000 cycles applied to thermistor. | R/R25% | ||
| 3. Usage Precautions | ||||
| Product purpose | Surge current suppression | |||
| Soldering iron welding | Welding temperature < 360, welding time < 3 sec, distance from coating 2mm | |||
| Storage temperature | -10 ~ 40 | |||
| Storage humidity | % RH | 75% | ||
| Storage environment | Avoid corrosive gases and direct sunlight | |||
| Packaging | Reseal after opening | |||
| Storage period | 1 year | |||
| 4. Derating Curve | ||||
| See attached figure | ||||
| 5. Outline Dimensions (Unit: mm) | ||||
| D | mm | Max 9 | ||
| L | mm | Min 17 | ||
| L1 | mm | 52 | ||
| L2 | mm | 51 | ||
| F | mm | 1 | ||
| F1 | mm | Max 5 | ||
| F2 | mm | 0.60.05 | ||
| T | mm | Max 9 | ||
| d | mm | Max 5 | ||
| 6. Product Model Description | ||||
| MF72 | Power Type NTC Thermistor | |||
| 22 | Zero-power resistance at 25 is 22 | |||
| D7 | Body diameter is D7 | |||
| 7. Certifications | ||||
| Quality Management System | ISO9001:2008 (01115Q20270R5M), ISO/TS16949:2009 (0192416) | |||
| Environmental Management System | ISO14001:2004 (01113E20060R2M) | |||
| Environmental Test Report | RoHS | |||
| Safety Certification | CQC (CQC04001010556) | |||
| High-tech Product Certification | Jiangsu Province (120115G0178N) | |||
| TUV Certification | R50245892 | |||
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