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Specifications
Resistance @ 25℃:
3Ω
Power(Watts):
2W
Pitch:
7.5mm
Operating Temperature:
-40℃~+150℃
Tolerance:
±20%
B Constant (25℃/100℃):
-
Steady State Current (Max):
4A
Thermal Time Constant:
35s
B Constant (25℃/85℃):
-
B Constant (25℃/75℃):
-
B Constant (25℃/50℃):
2600K
B Constant Tolerance:
±10%
Mfr. Part #:
MF72 3D9
Package:
Through Hole,P=7.5mm
Key Attributes
Model Number:
MF72 3D9
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 components offer reliable electrical performance and are suitable for applications requiring protection against inrush currents. The series includes various models with different resistance values and physical dimensions, catering to specific application needs.
Product Attributes
- Brand: Shiheng ()
- Product Type: Power Type NTC Thermistor
- Origin: Nanjing, China
- Encapsulation Material: Black Silicone Resin
- Lead Material: Tinned Copper Wire
- Certifications: ISO9001:2008, ISO/TS16949:2009, ISO14001:2004, RoHS, CQC, UL, Jiangsu Provincial High-tech Product, TUV
Technical Specifications
| Item | Symbol | Test Condition | Unit | Performance Requirement | |||
|---|---|---|---|---|---|---|---|
| 1. Electrical Performance | |||||||
| Zero-power resistance at 25 | R25 | Ta=250.5, Test Power 0.1mW, Tested in air | 3 20% | ||||
| B Value | B25/50 | B=[(TaTb)/(Tb-Ta)]ln(Ra/Rb) | K | 2600 10% | |||
| Max. Steady Current | I max | / | A | 4 | |||
| Max. Allowable Capacitance | CT | 240Vac | F | 68 | |||
| Dissipation Factor | / | mW/ | 11 | ||||
| Thermal Time Constant | / | sec | 35 | ||||
| Withstand Voltage | / | 500V/AC, 1min | / | No breakdown or arcing | |||
| Insulation Resistance | / | 500V/DC, 1min | M | 500 | |||
| Operating Temperature Range | / | / | -40 ~ 150 | ||||
| Max. Rated Power | Pmax | / | W | 2 | |||
| Resistance-Temperature Curve | / | / | / | See Figure 1 | |||
| Volt-Ampere Curve | / | / | / | See Figure 2 | |||
| 2. Reliability | |||||||
| Lead Strength | / | Pull force: 10N for 0.5| / | No visible damage, R/R25% | | |||
| Solderability | / | Temperature 2455, Time 2-3 sec | / | Wetted area 95% | |||
| Resistance to Soldering Heat | / | Solder pot temperature: 2605, Immersion depth 6mm from the body, Time 101 sec | / | R/R25% | |||
| Steady Damp Heat | / | Temperature: 402, Humidity: 932%, Time: 1000 hours | / | R/R25% | |||
| Rapid Temperature Change | / | -40 30min 25 5min 150 30min 25 5min, repeated 5 times | / | R/R25% | |||
| High Temperature Storage | / | Temperature: 1505, Time: 1000 hours | / | R/R25% | |||
| Max. Steady Current Endurance | / | Continuously apply max. steady current at room temperature for 100024h | / | R/R25% | |||
| Max. Capacitance Endurance | / | Apply max. allowable capacitance, intermittently close 50ms, open 5 times the thermal time constant for one cycle, apply 1000 cycles to the thermistor. | / | R/R25% | |||
| 3. Usage Precautions | |||||||
| Product Purpose | / | / | / | Surge current suppression | |||
| Soldering Iron Welding | / | Distance from coating layer at welding point 2mm, welding temperature <360, welding time <3s | / | / | |||
| Storage Temperature | / | / | -10 ~ 40 | ||||
| Storage Humidity | / | / | % RH | 75% | |||
| Storage Environment | / | / | / | Avoid storage in corrosive gas and direct sunlight environments | |||
| Packaging | / | / | / | Reseal after opening | |||
| Shelf Life | / | / | Year | 1 | |||
| 5. Outline Dimensions (Unit: mm) | |||||||
| Model | D | L1 | L2 | F1 | F2 | T | d |
| MF72-3D9 | Max 11.0 | Min 17 | 82 | 7.51 | 51.5 | Max 5.5 | 0.80.05 |
| 6. Product Model Description | |||||||
| MF72 | 3 | D | 9 | / | |||
| Description | Brand: Shiheng | Model: MF72 (Power Type NTC Thermistor) | Resistance: 3 (3 at 25) | Diameter: D9 (Body Diameter 9mm) | |||
1810170729_Nanjing-Shiheng-Elec-MF72-3D9_C72677.pdf
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