Surge Current Suppression with Nanjing Shiheng Elec MF72 10D7 Power NTC Thermistor Series
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Delivery Time:
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Product Description
Product Overview
The MF72 Power NTC Thermistor series from Nanjing Shiheng Electronics Co., Ltd. is designed for current limiting applications. This series offers reliable surge current suppression with a maximum steady current of 0.9A and a maximum allowable capacity value of 100F at 240Vac. Operating within a temperature range of -40 to 130, these thermistors are constructed with a black phenolic resin encapsulation and feature tinned copper clad steel wires for lead connections. They meet RoHS environmental protection requirements.
Product Attributes
- Brand: Shiheng ()
- Product Type: Power NTC Thermistor
- Series: MF72
- Encapsulation Material: Black phenolic resin
- Lead Wire Material: Tinned copper clad steel wire
- Certifications: ISO9001:2015, IATF16949:2016, ISO14001:2015, RoHS 2.0, CQC (CQC04001010556), TUV (R50245892), Jiangsu Province High-tech Product
- Origin: Nanjing, China
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirements |
|---|---|---|---|---|
| Zero Power Resistance at 25 | R25 | Ta=250.5 (Test Power 0.1mW, in air) | 10 20% | |
| B-value (B25/50) | B | Ta=250.01, Tb=500.01 | K | 2800 10% |
| Max steady current | I max | - | A | 0.9 |
| Max allowable capacity value | CT | 240Vac | F | 100 |
| Thermal dissipation Coefficient | In still air | mW/ | 9 | |
| Thermal time constant | In still air | sec | 27 | |
| Withstand voltage | - | 500V/AC, 1min | - | No breakthrough and flash over |
| Insulation resistance | - | 500V/DC, 1min | M | 500 |
| Operating temperature range | - | - | -40 ~ 130 | |
| Maximum rated power | Pmax | - | W | 1 |
Product Drawing Dimensions
| Model | DMax | L1Min | L2 2 | F 0.5 | TMax | d 0.05 |
|---|---|---|---|---|---|---|
| MF72 10D7 | 8.0 | 20 | 5 | 5.0 | 5 | 0.6 |
Reliability Testing
| Item | Test Standard | Test Conditions and Methods | Performance Requirements |
|---|---|---|---|
| Terminal strength | IEC60068-2-21 | Lead diameter (0.5| No obvious damage, |R25/R25|25% | |
| Solderability | IEC60068-2-20 | Temperature 2455, time 2-3 sec | Wetting area 95% |
| Withstand soldering heat | IEC60068-2-20 | Tin pot temperature: 2605, insert depth from body 6mm, time 10 1 seconds | |R25/R25|25% |
| Steady humidity and heat | IEC60068-2-78 | Temperature: 402, humidity: 932%, Time: 500 hrs | |R25/R25|25% |
| Rapid changes in temperature | IEC60068-2-14 | -40 30min25 5min130 30min25 5min, 5 cycles | |R25/R25|25% |
| High temperature storage | IEC60068-2-2 | Temperature: 1305, Time: 500hrs | |R25/R25|25% |
| Durability for max steady current | IEC60539-1 | Sustained max steady current upon the thermistor at ambient temperature. 50024h | |R25/R25|25% |
| Max capacity volume | IEC60539-1 | Impose 1000 cycles. Intermittent switch 50ms, cut 5 times thermal time constant as one cycle. | |R25/R25|25% |
Product Packaging
| Packing Type | Packing Specification | Packing Material, Size | Quantity |
|---|---|---|---|
| Bulk Type | 1 | Self sealing bag, WH11mm12mm | - |
| Reel Type | 2 | Reel packing box, WGH335mm240mm50mm | - |
| Pallet Packaging | - | - | - |
Installation & Use Precautions
- Purpose: Current limitation (surge current suppression).
- Soldering: Weld spot should be at least 2mm from the encapsulation head. Welding temperature should be under 360, with a time of less than 3 seconds.
- Storage Temperature: -1040.
- Storage Humidity: 75% RH.
- Environment: Avoid storage in environments with corrosive gases and direct illumination.
- Shelf Life: Packaging needs to be resealed after opening. Storage period is 1 year. Products exceeding the storage period can be retested according to the standard requirements and can still be used if they meet the requirements.
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