Current Limiting Thermistor Nanjing Shiheng Elec MF72 5D9-3.5 High Temperature Resistance Up to 300C
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Product Description
Product Overview
The MF72 Series Power NTC Thermistor from Nanjing Shiheng Electronics Co., Ltd. is designed for current limiting applications. It features a silicone resin encapsulation that offers high temperature resistance (up to 300C), fast heat dissipation, and good insulation. This series is suitable for applications requiring surge current suppression.
Product Attributes
- Brand: Shiheng ()
- Origin: Nanjing, China
- Encapsulation Material: Green Silicone Resin
- Certifications: ISO9001:2015, IATF16949:2016, ISO14001:2015, RoHS 2.0, CQC, TUV, UL, Jiangsu Province High-tech Product
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirements |
|---|---|---|---|---|
| Product Model | MF72 5D9 | |||
| Zero Power Resistance at 25 | R25 | Ta=250.5 (Test Power 0.1mW, in air) | 5 20% | |
| B-value (B25/50) | B | Ta=250.01, Tb=500.01 | K | 2600 10% |
| Max steady current | I max | A | 3 | |
| Max allowable capacity value | CT | 240Vac | F | 220 |
| Thermal dissipation Coefficient | In still air | mW/ | 11 | |
| Thermal time constant | In still air | sec | 34 | |
| Withstand voltage | 500V/AC 1min | No breakthrough and flash over | ||
| Insulation resistance | 500V/DC 1min | M | 500 | |
| Operating temperature range | -40 ~ 170 | |||
| Maximum rated power | Pmax | W | 2 | |
| Body Diameter (Max) | DMax | mm | 10.0 | |
| Lead Diameter | d | mm | 0.8 | |
| Lead Material | Tinned copper clad steel wire |
Reliability Testing
| Item | Test Standard | Test Conditions and Methods | Performance Requirements |
|---|---|---|---|
| Terminal strength | IEC60068-2-21 | Pull strength: 10N (for 0.5| No obvious damage |R25/25R|25% | |
| Solderability | IEC60068-2-20 | Temperature: 2455, Time: 2-3 sec | Soldered area 95% |
| Withstand soldering temp | IEC60068-2-20 | Tin pot temp: 2605, Immersion depth from body: 6mm, Time: 10 1 sec | |R25/25R|25% |
| Steady humidity and heat | IEC60068-2-78 | Temp: 402, Humidity: 932%, Time: 1000 hrs | |R25/25R|25% |
| Rapid changes in temperature | IEC60068-2-14 | -40(30min)25(5min)170(30min)25(5min), 5 cycles | |R25/25R|25% |
| High temperature storage | IEC60068-2-2 | Temp: 1705, Time: 1000 hrs | |R25/25R|25% |
| Durability for max steady current | IEC60539-1 | Sustained max steady current at ambient temperature: 100024h | |R25/25R|25% |
| Max capacity value durability | IEC60539-1 | 1000 cycles (intermittent switch 50ms, cut 5 times thermal time constant as one cycle) | |R25/25R|25% |
Installation & Use Precautions
- Purpose: Current limitation (surge current suppression).
- Soldering: Welding spot at least 2mm from the encapsulation head. Welding temperature
- Storage Temperature: -1040.
- Storage Humidity: 75% RH.
- Storage Environment: Avoid corrosive gases and direct sunlight.
- Shelf Life: 1 year after opening and resealing. Re-inspection is permitted if requirements are met after the storage period.
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