Through Hole SQM Ceramic Cased Cement Fixed Wirewound Power Resistor 5W 47K 5%
Description Of The Cement Fixed Wirewound Power Resistor 5W 47K 5%
Ampfort’s wire wound resistors are made by winding the resistance wire around the glass fiber core or ceramic core. For high ohmage value and resistance range 1% the metal oxide film will be used instead of the wire wound. Two types of packaging are available. Type one using non-corrosive. Heat proof, humidity proof, and nonflammable.
Features Of The Cement Fixed Wirewound Power Resistor 5W 47K 5%
* Low noise
* Instance overload capability; long term stability
* Excellent insulation being used in PCB
* Excellent heat dissipation; small linear
* Metal oxide film cutting core can offer high range resistance (1Ω--100KΩ)
* Operating temperature range
Wire Wound:-55°C--+155°C
Metal Oxide:-30°C--+155°C
Dimension Of The Cement Fixed Wirewound Power Resistor 5W 47K 5% (mm)
| Type | H±1.5 | W±1.0 | S±1.0 | P±1.0 | d±1.0 |
| CR-M 5W | 25 | 13.5 | 9 | 5 | 0.7 |
Performances Of The Cement Fixed Wirewound Power Resistor 5W 47K 5%
| Characteristics | Standard | Test Methods |
| 1. Temperature Coefficient of Resistors (PPM/℃) | Wire Wound –80~+900 | Natural resistance change per temperature degree centigrade. (PPM/℃) R1: Resistance value at reference temp. (T1) R2: Resistance value at reference temp. (T2) T1: Room temperature T2 : T1+100℃ |
| 2. Dielectric Withstanding Voltage | No evidence of flashover, mechanical damage or arcing or insulation break down | Resistors shall be subjected to an approximately sinusoidal test potential (as below) 60Hz applied between both terminals connected together and a 90° V-Block extending beyond the end of the resistor |
| Resistor Wattage | AC or RMS Volts |
| 1W ABOVE | 500 |
| 3. Solderability | 90% Covered min. | The terminal lead shall be dipped into molten solder s at 3.2 to 4.8mm from the body of resistor. The temp. and time as below: a. 235±5℃ for 2±0.5 seconds b. 270±10℃ for 2±0.5 seconds |
| 4. Resistance to Soldering | No evidence of mechanical damage ∆R / R at ±2% Max | The terminal of the resistor is dipped into the molten solder of 350 ± 10℃for 3 ± 0.5 seconds. Then put the resistor in the room temperature. For 3 min. hours. |
| 5. Humidity Load Life | ±5% Max / 1000Hours | Resistance change after 1000 hours (1.5 hours on 0.5 hours off) at rated continuous working voltage in a humidity chamber controlled at 40 ± 2℃and 90~95% relative humidity . |
| 6. Load Life | ±5% Max / 1000Hours | Permanent resistance change after 1000 hours operating at rated continuous working voltage with a duty cycle of 1.5 hours on 0.5 hours off at 70 ± 2℃ambient |
| 7. Temperature Cycling | ±2% Max with no evidence of mechanical damage | Resistance change after continuous 5 cycles for duty cycle as specified below. |
| Step | Temperature | Time |
| 1 | -30℃ | 30 Minutes |
| 2 | +25℃ | 10~15 Minutes |
| 3 | +85℃ | 30 Minutes |
| 4 | +25℃ | 10~15 Minutes |
| Characteristics | Standard | Test Methods |
| 8. Short Time Overload | ∆R / R at±3% Max with no evidence of arcing burning, or charring | Permanent resistance change after the application of a potential of 2.5 times rated continuous working voltage for 5 seconds at room temperature. |
| 9. Terminal Strength | No evidence of mechanical damage or loosening terminals | Direct load resistance to 2.5kg direct load 30± 5 seconds twist test, for axial leads unit only. Terminal lead shall be bent through at a right angle at a point of 6.35mm from the body of resistor and shall be rotated through at a right angle about the original axis of the bent terminal in alternating direction for a total of 3 rotations. |
| 10. Burn Out | The arcing and or flaming duration is less than 2seconds and the flame height is less than 1/2 inch. | Resistors burning out or opening up for overloads in excess of 10 times rated wattage (regardless of how it is applied) |
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