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Specifications
Resistance @ 25℃:
33Ω
Power(Watts):
1W
Pitch:
5mm
Operating Temperature:
-40℃~130℃
Tolerance:
±20%
B Constant (25℃/100℃):
-
Steady State Current (Max):
500mA
Thermal Time Constant:
28s
B Constant (25℃/85℃):
-
B Constant (25℃/75℃):
-
B Constant (25℃/50℃):
2800K
B Constant Tolerance:
±10%
Mfr. Part #:
MF72 33D7
Package:
Through Hole,P=5mm
Key Attributes
Model Number:
MF72 33D7
Product Description
Product Overview
The MF72 series of power-type NTC thermistors from Nanjing Shiheng Electronics Technology Co., Ltd. are designed for surge current suppression. These thermistors offer reliable performance with a wide operating temperature range and are manufactured under stringent quality management systems. They are suitable for applications requiring protection against inrush current.
Product Attributes
- Brand: Shiheng
- Product Type: Power Type NTC Thermistor
- Origin: Nanjing, China
- Encapsulation Material: Black phenolic resin
- Lead Material: Tinned copper wire
- Certifications: ISO9001:2008, ISO/TS16949:2009, ISO14001:2004, RoHS, CQC Safety Certification, Jiangsu High-tech Product Certification, TUV
Technical Specifications
| Item | Symbol | Test Conditions | Unit | Performance Requirements |
|---|---|---|---|---|
| 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 | 2800 10% |
| Max. Steady Current | I max | A | 0.5 | |
| Max. Allowable Capacitance | CT | 240Vac | F | 47 |
| Dissipation Factor | mW/ | 10 | ||
| Thermal Time Constant | sec | 28 | ||
| Withstand Voltage | 500V/AC, 1min | No breakdown or flashover | ||
| Insulation Resistance | 500V/DC, 1min | M | 500 | |
| Operating Temperature Range | -40 ~ 130 | |||
| Max. Rated Power | Pmax | W | 1 | |
| Lead Strength (Tensile) | 101 sec | N | 10 (for 0.5 | |
| Lead Strength (No visible damage) | R/R25% | |||
| Solderability | Temperature 2455, Time 2-3 sec | 95% tinned area | ||
| Resistance to Soldering Heat | Solder pot temperature: 2605, Immersion depth 6mm from body, Time 101 sec | R/R25% | ||
| Steady State Damp Heat | Temperature: 402, Humidity: 932%, Time: 500 hours | R/R25% | ||
| Temperature Cycling | -40 30min25 5min130 30min25 5min, 5 cycles | R/R25% | ||
| High Temperature Storage | Temperature: 1305, Time: 1000 hours | R/R25% | ||
| Max. Steady Current Durability | Continuous application of max. steady current at room temperature for 50024h | R/R25% | ||
| Max. Capacitance Endurance | Apply max. allowable capacitance, 50ms on, 5 times thermal time constant off, 1000 cycles | R/R25% |
| Model | Description |
|---|---|
| MF72-33D7 | Power Type NTC Thermistor, 33 (at 25 zero-power resistance), D7 (body diameter) |
| Dimension | L1 | L2 | F1 | F2 | T | d |
|---|---|---|---|---|---|---|
| (Unit: mm) | Min 17 | 5 2 | 5 1 | 3 1.5 | Max 5 | 0.6 0.05 |
Usage Notes
- Primary Use: Surge current suppression.
- Soldering: Keep soldering point at least 2mm from the coating layer. Soldering temperature below 360, soldering time less than 3 seconds.
- Storage Temperature: -1040.
- Storage Humidity: 75% RH.
- Storage Environment: Avoid storage in environments with corrosive gases and direct sunlight.
- Packaging: Reseal packaging after opening.
- Shelf Life: 1 year.
1808291211_Nanjing-Shiheng-Elec-MF72-33D7_C72678.pdf
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