Product Overview
The MF72 series of power-type NTC thermistors from Nanjing Shiheng Electronics Technology Co., Ltd. are designed to suppress inrush current. These thermistors are manufactured with a black epoxy resin encapsulation and tinned copper leads, offering reliable performance in a wide operating temperature range of -40C to 170C. They are suitable for various applications requiring surge current protection, with specific attention to soldering guidelines for optimal performance and longevity. The product line includes various models with different resistance values and dimensions, certified under multiple international standards including UL, ISO, and CQC.
Product Attributes
- Brand: Shiheng
- Product Type: Power Type NTC Thermistor
- Encapsulation Material: Black Epoxy Resin
- Lead Material: Tinned Copper Wire
- Origin: Nanjing, China
- Certifications: ISO9001:2008, ISO/TS16949:2009, ISO14001:2004, RoHS, CQC, UL (E241319), Jiangsu High-tech Product, TUV (R50245892)
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirement |
|---|---|---|---|---|
| Zero-power resistance at 25 | R25 | Ta=250.5, Test power 0.1mW, Tested in air | 33 20% | |
| B value | B25/50 | B=[(TaTb)/(Tb-Ta)]ln(Ra/Rb) | K | 3000 10% |
| Max. steady-state current | I max | A | 1 | |
| Max. allowable capacitance | CT | 240Vac | F | 150 |
| Dissipation factor | mW/ | 11 | ||
| Thermal time constant | sec | 30 | ||
| Withstand voltage | 500V/AC, 1min | No breakdown or arcing | ||
| Insulation resistance | 500V/DC, 1min | M | 500 | |
| Operating temperature range | -40 ~ 170 | |||
| Max. rated power | Pmax | W | 2 | |
| Lead strength | Tension: 101 sec | 0.5 | ||
| Solderability | Temperature 2455, time 2-3 sec | 95% tinning area | ||
| Resistance to soldering heat | Solder pot temperature: 2605, immersion depth 6mm from resistor body, time 101 sec | R/R25% | ||
| Steady damp heat | Temperature: 402, Humidity: 932%, Time: 1000 hours | R/R25% | ||
| Rapid temperature change | -40 30min25 5min170 30min25 5min, repeated 5 times | R/R25% | ||
| High temperature storage | Temperature: 1705, Time: 1000 hours | R/R25% | ||
| Max. steady-state current durability | Continuously apply max. steady-state current at room temperature for 100024h | R/R25% | ||
| Max. capacitance durability | Apply max. allowable capacitance, intermittently close 50ms, open 5 times thermal time constant for one cycle, apply 1000 cycles | R/R25% | ||
| Model: MF72-33D9 | ||||
| Body Diameter (D) | D | mm | Max 11.0 | |
| Length (L) | L1, L2 | mm | Min 17, 7.51 | |
| Lead Spacing (F) | F1, F2 | mm | 82, 51.5 | |
| Lead Diameter (d) | d | mm | 0.80.05 |
Usage Notes
- Primary Use: Inrush current suppression.
- Soldering: Distance from coating layer at soldering point should be at least 2mm. Soldering temperature should be below 360, with a time of less than 3 seconds.
- Storage Temperature: -10 to 40.
- Storage Humidity: 75% RH.
- Storage Environment: Avoid storage in environments with corrosive gases and direct sunlight.
- Packaging: Reseal packaging after opening for storage.
- Shelf Life: 1 year.
Product Model Explanation
MF72-33D9
- MF72: Power Type NTC Thermistor
- 33: Zero-power resistance at 25 is 33
- D9: Body diameter is 9mm
1810170728_Nanjing-Shiheng-Elec-MF72-33D9_C72687.pdf
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