Current Limiting Power NTC Thermistor Nanjing Shiheng Elec MF72 10D11-3.5 with Silicone Resin Encapsulation
Product Overview
The MF72 Power NTC Thermistor series from Nanjing Shiheng Electronics Co., Ltd. is designed for current limitation and surge current suppression. Utilizing a high-temperature resistant silicone resin encapsulation, these thermistors offer excellent heat dissipation and insulation properties. They are suitable for applications requiring protection against inrush currents, with a focus on reliability and performance.
Product Attributes
- Brand: Shiheng
- Product Type: Power NTC Thermistor
- Series: MF72
- Encapsulation Material: Green Silicone Resin
- Certifications: ISO9001:2015, IATF16949:2016, ISO14001:2015, RoHS 2.0, CQC (CQC04001010556), TUV (R50245892), UL (E241319), Jiangsu Province High-tech Product
- Origin: Nanjing, China
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirements |
|---|---|---|---|---|
| 25 Zero Power Resistance | R25 | Ta=250.5 (Test Power 0.1mW, in air) | 1020% | |
| B-value (B25/50) | B | Ta=250.01, Tb=500.01 | K | 280010% |
| Max Steady Current | I max | - | A | 3 |
| Max Allowable Capacity Value | CT | 240Vac | F | 220 |
| Thermal Dissipation Coefficient | In still air | mW/ | 6 | |
| Thermal Time Constant | In still air | sec | 85 | |
| 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 | 3 |
| Dimensions (Dmax x L1 x L2 x F x Tmax x d) | - | - | mm | 12 x 3.50.5 x 52 x 7.50.5 x 5.5 x 0.80.05 |
| Lead Wire Material | - | - | - | Tinned copper-weld steel wire |
| RoHS Compliance | - | - | - | Yes |
Reliability Testing
| 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 | |R25/R25|25% |
| Solderability | IEC60068-2-20 | Temperature 2455, Time 2-3 sec | Tin coverage area 95% |
| Withstand Soldering Heat | IEC60068-2-20 | Tin pot temperature: 2605, Insert depth from body 6mm, Time 10 1 sec | |R25/R25|25% |
| Steady Humidity and Heat | IEC60068-2-78 | Temperature: 402, Humidity: 932%, Time: 1000 hours | |R25/R25|25% |
| Rapid Changes in Temperature | IEC60068-2-14 | -40 30min 25 5min 170 30min 25 5min, 5 cycles | |R25/R25|25% |
| High Temperature Storage | IEC60068-2-2 | Temperature: 1705, Time: 1000 hours | |R25/R25|25% |
| Durability for Max Steady Current | IEC60539-1 | Sustained max steady current at ambient temperature, 100024h | |R25/R25|25% |
| Max Capacity Value Durability | IEC60539-1 | 1000 cycles (Max capacity value, intermittent switch 50ms, cut 5 times thermal time constant as one cycle) | |R25/R25|25% |
Installation & Use Precautions
- Purpose: Current limitation
- Soldering: Welding spot at least 2mm from encapsulation head; temperature below 360; time less than 3 seconds.
- Storage Temperature: -10 to 40
- Storage Humidity: 75% RH
- Storage Environment: Avoid corrosive gases and direct illumination.
- Shelf Life: 1 year after opening packaging (reseal required). Re-inspection is permitted if requirements are met after the period.
Material Description
The silicone resin encapsulation used for the MF72 series offers high temperature resistance (above 300), fast heat dissipation, and good insulation. While the surface may appear rough and prone to minor friction marks, these do not affect product performance and can be manually erased. The material is firm but brittle; improper handling (e.g., heavy drops, bending leads) may cause minor cracks or chipping at the lead pins. These cosmetic imperfections have been tested and proven not to impact the product's performance or reliability.
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