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Specifications
Resistance @ 25℃:
5Ω
Power(Watts):
2W
Pitch:
7.5mm
Operating Temperature:
-40℃~+170℃
Tolerance:
±20%
B Constant (25℃/100℃):
-
Steady State Current (Max):
3A
Thermal Time Constant:
34s
B Constant (25℃/85℃):
-
B Constant (25℃/75℃):
-
B Constant (25℃/50℃):
2600K
B Constant Tolerance:
±10%
Mfr. Part #:
MF72 5D9
Package:
Through Hole,P=7.5mm
Key Attributes
Model Number:
MF72 5D9
Product Description
Product Overview
The MF72 series of Power Type NTC Thermistors, manufactured by Nanjing Shiheng Electronics Technology Co., Ltd., are designed for surge current suppression. These thermistors offer reliable electrical performance and durability, making them suitable for various industrial applications. The product specifications are detailed in this approval sheet, which outlines electrical characteristics, reliability tests, usage guidelines, and dimensional data. Confirmation of these specifications is requested.
Product Attributes
- Brand: Shiheng
- Product Name: MF72 Power Type NTC Thermistor
- Origin: Nanjing, China
- Encapsulation Material: Black Silicone Resin
- Lead Wire Material: Tinned Copper Wire
- Certifications: ISO9001:2008, ISO14001:2004, RoHS, CQC Safety Certification, UL Certification (E241319), Jiangsu Province High-tech Product Certification, TUV Certification (R50245892)
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirement |
|---|---|---|---|---|
| 1. Electrical Performance | ||||
| Zero-power resistance at 25 | R25 | Ta=250.5, Test Power 0.1mW, Tested in air | 5 20% | |
| B Value | B25/50 | B=[(TaTb)/(Tb-Ta)]ln(Ra/Rb) | K | 2600 10% |
| Maximum Steady Current | I max | / | A | 3 |
| Maximum Allowable Capacitance | CT | 240Vac | F | 68 |
| Dissipation Factor | / | mW/ | 11 | |
| Thermal Time Constant | / | sec | 34 | |
| Dielectric Strength | / | 500V/AC, 1min | / | No breakdown or arcing |
| Insulation Resistance | / | 500V/DC, 1min | M | 500 |
| Operating Temperature Range | / | / | -40 ~ 170 | |
| Maximum Rated Power | Pmax | / | W | 2 |
| Resistance-Temperature Curve | / | / | / | See Figure 1 |
| Volt-Ampere Curve | / | / | / | See Figure 2 |
| 2. Reliability | ||||
| Lead Wire Strength | / | Tensile Force: 10s1s | N | 0.5 |
| Solderability | / | Temperature 2455, Time 2-3s | % | 95% tinning area |
| Resistance to Soldering Heat | / | Solder pot temperature: 2605, Immersion depth 6mm from resistor body, Time 101s | / | R/R25% |
| Steady State Damp Heat | / | Temperature: 402, Humidity: 932%, Time: 1000 hours | / | R/R25% |
| Temperature Rapid Change | / | -40 30min25 5min170 30min25 5min, 5 cycles | / | R/R25% |
| High Temperature Storage | / | Temperature: 1705, Time: 1000 hours | / | R/R25% |
| Maximum Steady Current Durability | / | Continuous application of maximum steady current at room temperature, 100024h | / | R/R25% |
| Maximum Capacitance Endurance | / | Apply maximum allowable capacitance, intermittently close 50ms, disconnect 5 times the thermal time constant for one cycle, apply 1000 cycles. | / | R/R25% |
| 3. Usage Precautions | ||||
| Product Use | / | Surge current suppression | / | / |
| Soldering Iron Welding | / | Welding distance from coating layer 2mm, Welding temperature <360, Welding time <3s | / | / |
| Storage Temperature | / | / | -10 ~ 40 | |
| Storage Humidity | / | / | % RH | 75% |
| Storage Environment | / | Avoid storage in environments with corrosive gases and direct sunlight | / | / |
| Packaging | / | Reseal after opening | / | / |
| Shelf Life | / | / | Year | 1 |
| 4. Derating Curve | ||||
| / | / | / | / | See attached figure |
| 5. Outline Dimensions (Unit: mm) | ||||
| Model | D | L | L1 | L2 |
| MF72-5D9 | Max 11.0 | Min 17 | 82 | 7.51 |
| / | F1 | F2 | T | d |
| MF72-5D9 | 51.5 | Max 5.5 | / | 0.80.05 |
| 6. Product Model Description | ||||
| MF72 | 5 | D | 9 | / |
| / | ||||
| : Shiheng Brand | : MF72: Power Type NTC Thermistor | : 5: Zero-power resistance at 25 is 5 | : 9: Body diameter D9 | / |
1811091810_Nanjing-Shiheng-Elec-MF72-5D9_C11277.pdf
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