Product Overview
The MF72 Power NTC Thermistor series from Nanjing Shiheng Electronics Co., Ltd. is designed for current limiting applications. These thermistors utilize a silicone resin encapsulation, offering high-temperature resistance (up to 300C), fast heat dissipation, and good insulation. The material is chosen for its effectiveness in power NTC thermistors and provides a robust yet thermally efficient solution. While the silicone surface may exhibit minor friction marks from handling, and the encapsulation at the leads can show minor cracks or chips under improper external force, these cosmetic aspects do not affect the product's performance or reliability.
Product Attributes
- Brand: Shiheng
- Product Type: Power NTC Thermistor
- Series: MF72
- Encapsulation Material: Green Silicone Resin
- Wire Material: Tinned Copper Clad Steel Wire
- Certifications: ISO9001:2015, IATF16949:2016, ISO14001:2015, RoHS 2.0, CQC (CQC04001010556), TUV (R50245892), UL (E241319), Jiangsu Province High-tech Product
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirements |
|---|---|---|---|---|
| Zero Power Resistance at 25 | R25 | Ta=250.5 (Test Power 0.1mW, in air) | 3 20% | |
| B-value (B25/50) | B | Ta=250.01, Tb=500.01 | K | 2600 10% |
| Max steady current | I max | - | A | 4 |
| Max allowable capacity value | CT | 240Vac | F | 220 |
| Thermal dissipation Coefficient | In still air | mW/ | 11 | |
| Thermal time constant | In still air | sec | 35 | |
| 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 |
| Product Model | MF72 3D9 | - | - | - |
| Dimensions (D) | - | - | mm | 10 |
| Dimensions (L1) | - | - | mm | 3.5 0.5 |
| Dimensions (L2) | - | - | mm | 5 2 |
| Dimensions (F) | - | - | mm | 7.5 0.5 |
| Dimensions (T) | - | - | mm | 5.5 Max |
| Dimensions (d) | - | - | mm | 0.8 0.05 |
Reliability
| Item | Test Standard | Test Conditions and Methods | Performance Requirements |
|---|---|---|---|
| Terminal strength | IEC60068-2-21 | Lead diameter(mm): 0.5<d0.8, Pull strength(N): 10; Time: 101 sec | No obvious damage; |R25/25R|25% |
| Solderability | IEC60068-2-20 | Temperature 2455, time 2-3 sec | Tinning coverage area 95% |
| Withstand soldering temp | IEC60068-2-20 | Tin pot temperature: 2605, insert depth from body 6mm, time 10 1 seconds | |R25/25R|25% |
| Steady humidity and heat | IEC60068-2-78 | Temperature: 402, humidity: 932%, Time: 1000 hours | |R25/25R|25% |
| Rapid changes in temperature | IEC60068-2-14 | -40 30min25 5min170 30min25 5min, 5 cycles | |R25/25R|25% |
| High temperature storage | IEC60068-2-2 | Temperature: 1705, Time: 1000 hours | |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% |
Product Packaging
| Packing Type | Packing Specification | Packing Material, Size | Quantity |
|---|---|---|---|
| Bulk Type | Packing bag | Self sealing bag | 1 |
| Reel Type | Reel packing box | Packing box WGH335mm240mm50mm | - |
Installation & Use Precautions
- Purpose: Current limitation.
- Soldering: Weld spot at least 2mm from encapsulation head; temperature below 360; time less than 3 seconds.
- Storage Temperature: -1040.
- Storage Humidity: 75% RH.
- Storage Environment: Avoid corrosive gases and direct light.
- Shelf Life: 1 year after opening. Re-inspection is permitted if requirements are met after expiration.
2410121635_Nanjing-Shiheng-Elec-MF72-3D9-3-5_C18197896.pdf
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