Power NTC Thermistor Nanjing Shiheng Elec MF72 5D5-3.5 Silicone Resin Encapsulation Surge Current Suppression
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 providing high temperature resistance (up to 300C), fast heat dissipation, and good insulation. This thermistor is suitable for applications requiring surge current suppression.
Product Attributes
- Brand: Shiheng
- 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
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Requirements | ||
|---|---|---|---|---|---|---|
| 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 | 2500 10% | ||
| Max steady current | I max | A | 1 | |||
| Max allowable capacity value | CT | F | 100 | |||
| Thermal dissipation Coefficient (in still air) | mW/ | 6 | ||||
| Thermal time constant (in still air) | sec | 20 | ||||
| Withstand voltage | 500V/AC, 1min | No breakthrough and flash over | ||||
| Insulation resistance | 500V/DC, 1min | M | 500 | |||
| Operating temperature range | -40 ~ 150 | |||||
| Maximum rated power | Pmax | W | 0.5 | |||
| Dimensions (mm) | D | L1 | L2 | F0.5 | T Max | d0.05 Max |
| 6.0 | 3.50.5 | Max 2.5 | 2.5 | 5 | 0.45 | |
| Technical Requirements | 1) Zero Power Resistance: R25: 520% | |||||
| 2) B-value: B25/50: 2500K10% | ||||||
| 3) Lead Wire: Tinned copper clad steel wire | ||||||
| 4) Encapsulation: Green silicon resin | ||||||
| 5) Environmental Requirements: RoHS compliant | ||||||
Reliability
| Item | Test Standard | Test Conditions and Methods | Performance Requirements |
|---|---|---|---|
| Terminal strength | IEC60068-2-21 | Lead diameter (mm): 0.5| No obvious damage; |R25/25R|25% | |
| Solderability | IEC60068-2-20 | Temperature 2455, time 2-3 sec | Coverage area 95% |
| Withstand soldering temp | IEC60068-2-20 | Tin pot temperature: 2605, insert 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% (After test, samples need to be kept at room temperature for 2 hours before testing) |
| Rapid changes in temperature | IEC60068-2-14 | -40 30min 25 5min 150 30min 25 5min, 5 cycles | |R25/25R|25% (After test, samples need to be kept at room temperature for 2 hours before testing) |
| High temperature storage | IEC60068-2-2 | Temp: 1505, Time: 1000 hrs | |R25/25R|25% (After test, samples need to return to normal temperature naturally before testing) |
| Durability for max steady current | IEC60539-1 | Sustained max steady current at ambient temperature for 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: Bulk Type
- Packing Specification:
- 1. Packing Bag: Self sealing bag (WH11mm12mm)
- 2. Reel Packing Box: Packing box (WGH335mm240mm50mm)
Installation & Use Precautions
- Purpose: Current limitation
- Soldering: Weld spot at least 2mm from encapsulation head, temperature
- Storage Temperature: -1040
- Storage Humidity: 75% RH
- Storage Environment: Avoid corrosive gases and direct illumination.
- Shelf Life: 1 year after opening and resealing. Re-inspection is permitted if requirements are met after the shelf life.
Material Description
The silicone resin encapsulation coating offers high temperature resistance (above 300C), fast heat dissipation, and good insulation. The rough surface of the silicone resin, while prone to friction marks, does not affect product performance and can be manually erased. While the material is firm, its brittle nature and poor toughness may lead to cracks or chipping at the leads under improper external forces. These cosmetic imperfections, however, have been proven not to affect the product's performance characteristics or reliability.
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