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| Dimensions (mm) | ||||||||||
| Normal Size | Small Size | |||||||||
| Style | Rating @ 70 °C |
L Max | D Max | d +0.02 -0.05 |
Style | Rating @ 70 °C |
L Max | D Max | d +0.02 -0.05 |
H ±3 |
| MF-12 | 0.125W | 3.5 | 1.85 | 0.5 | MF-25-S | 0.25W | 3.5 | 1.85 | 0.5 | 28 |
| MF-25 | 0.25W | 6.8 | 2.50 | 0.6 | MF-40-SS | 0.4W | 3.7 | 1.9 | 0.5 | 28 |
| MF-50 | 0.5W | 10.0 | 3.50 | 0.6 | MF-50-S | 0.5W | 9.0 | 3.0 | 0.6 | 28 |
| MF-100 | 1W | 12.0 | 5.00 | 0.7 | MF-50-SS | 0.5W | 6.8 | 2.5 | 0.6 | 28 |
| MF-200 | 2W | 16.0 | 5.50 | 0.8 | MF-60-S | 0.6W | 6.8 | 2.5 | 0.6 | 28 |
| MF-300 | 3W | 17.5 | 6.50 | 0.8 | MF-200-S | 2W | 12.0 | 5.0 | 0.7 | 28 |
| *Flame retardant type available. | **Non - flammable coating standard for Small size (except MF-50-S) | |||||||||
| General Specifications | |||||||||
| Style | Dielectric with- standing Voltage |
Max Working Voltage @ 70°C |
Max. Overload Voltage @ 70 °C |
Resistance Tolerance | T.C.R. | Resistance Range |
Special Order | ||
| Resistance Tolerance | T.C.R. | Resistance Range |
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| MF-12 MF-25-S MF-40-SS |
400V | 200V | 400V | ±5% | ±200PPM/ °C | 1 - 10M | ±0.25% | ±15PPM/ °C ±25PPM/ °C ±50PPM/ °C |
51.1 - 200K |
| ±2% | ±100PPM/ °C | 1 - 10M | ±0.5% | 51.1 - 511K | |||||
| ±1% | ±50PPM/ °C | 1 - 10M | |||||||
| MF-25 MF-50-SS MF-60-S |
500V | 250V | 500V | ±5% | ±200PPM/ °C | 1 - 10M | ±0.1% | ±15PPM/ °C ±25PPM/ °C ±50PPM/ °C |
100 - 100K |
| ±2% | ±100PPM/ °C | 1 - 1M | ±0.25% | 51.1 - 330K | |||||
| ±1% | ±50PPM/ °C | 1 - 1M | ±0.5% | 10 - 1M | |||||
| MF-50 MF-50-S |
700V | 350V | 700V | ±5% | ±200PPM/ °C | 1 - 1M | ±0.1% | ±15PPM/ °C ±25PPM/ °C ±50PPM/ °C |
100 - 300K |
| ±2% | ±100PPM/ °C | 1 0- 1M | ±0.25% | 51.1 - 511K | |||||
| ±1% | ±50PPM/ °C | 10 - 1M | ±0.5% | 10 - 1M | |||||
| MF-100 MF-200 MF-200S MF-300 |
1000V | 500V | 1000V | ±5% | ±200PPM/ °C | 1 - 1M | ±0.1% | ±15PPM/ °C ±25PPM/ °C ±50PPM/ °C |
100 - 300K |
| ±2% | ±100PPM/ °C | 51.1 - 1M | ±0.25% | 51.1 - 511K | |||||
| ±1% | ±50PPM/ °C | 51.1 - 1M | ±0.5% | 51.1 - 1M | |||||
| * Higher and lower ohmic values available on a case to case basis. | |||||||||
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| Performance Specifications | |||||||||||||||||
| Characterisitcs | Test Methods | Limits | |||||||||||||||
| Temperature coefficient JIS -C -5202 5.2 |
Natural resistance change per temp. degree centigrade
R1: Resistance value at room temperature (t1) R2: Resistance value at room temp. +100°C (t2) Test pattern: Room temp., Room temp. +100°C |
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| Dielectric withstanding voltage JIS - C - 5202 5.7 |
Resistors shall be clamped in the trough of a 90° metalic V-block and shall be tested at AC potential respectively specified in the above list for 60 +10 / -0 seconds. |
No evidence of flashover, mechanical damage, arcing or insulation break down. | |||||||||||||||
| Temperature cycling JIS - C - 5202 7.4 |
Resistance change after continuous five cycles for duty cycle specified below:
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Resistance change rate is ± (1% +0.05 ) Max. with no evidence of mechanical damage |
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| Humidity (steady state) JIS - C - 5202 7.5 |
Temporary resistance change after a 240 hour exposure in a humidity test chamber controlled at 40°C ± 2°C and 90-95% relative humidity. | Resistance change rate is ± (0.5%+0.05) Max. with no evidence of mechanical damage. |
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| Short-time overload JIS - C - 5202 5.5 |
Permanent resistance change after the application of a potential of 2.5 times RCWV for 5 seconds. | Resistance change rate is (0.5%+0.05) Max. with no evidence of mechanical damage. |
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| Pulse overload JIS - C - 5202 5.8 |
Resistance change after 10,000 cycles (1 second "ON", 25 seconds "OFF") at 4 times RCWV. | Resistance change rate is ± (1%+0.05) Max. with no evidence of mechanical damage. |
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| Load life in humidity JIS - C - 5202 7.9 |
Resistance change after 1,000 hours (1.5 hours "ON", 0.5 hour "OFF") at RCWV in a humidity test chamber controlled at 40°C ± 2°C and 90-95% relative humidity. | Resistance change rate is ± (1.5%+0.05) Max. with no evidence of mechanical damage. |
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| Load life JIS - C - 5202 7.10 |
Permanent resistance change after 1,000 hours operating at RCWV, with duty cycle of 1.5 hours "ON", 0.5 hour "OFF" at 70°C ± 2°C ambient. | Resistance change rate is ± (1.5%+0.05) Max. with no evidence of mechanical damage |
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| Terminal strength JIS - C - 5202 6.1 |
Direct load: Resistance to a 2.5 kg direct load for 10 seconds in the direction of the longitudinal axis of the terminal leads. Twist test: Terminal leads shall be bent through 90° at a point of about 6mm from the body of the resistor and shall be rotated through 360° about the original axis of the bent terminal in alternating direction for a total of 3 rotations. |
No evidence of mechanical damage | |||||||||||||||
| Resistance to soldering heat JIS - C - 5202 6.4 |
Permanent resistance change when leads immersed to 3.2 - 4.8 mm from the body in 350°C ± 10°C solder for 3 ± 0.5 sec. | < 100, ± (0.5%+0.05) Max. > 100 , ± (1%+0.05) Max. |
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| Solderability JIS - C - 5202 6.5 |
The area covered eith a new, smooth, clean, shiny and continuous surface free from concentrated pinholes. Test temp. of solder: 235°C ± 5°C Dwell time in solder: 3 +0.5 / -0 seconds |
95% coverage min. | |||||||||||||||
| Resistance to solvent JIS - C - 5202 6.9 |
Specimens shall be immersed in a bath of trichroethane completely for 3 minutes with ultrasonic. | No deterioration of protective coatings and markings | |||||||||||||||
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How To Order
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| Example: | |||
| 1/4W | 1000 ohms | 1% | Tape & Reel |
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| MF25 | 1001 | F | T |
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Wattage
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Resistance
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Tolerance & T.C.
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Packaging
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1/8 W = MF12
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1st 3 digits are significant. The 4th digit denotes the no. of zeros to follow |
B = .1% 15ppm
C = .25% 25ppm D = .5% 50ppm F = 1% 50ppm G = 2% 100ppm J = 5% 200ppm |
A= Tape/box T = Tape/reel B = Bulk Box P = Tape Box of PT26 Type |
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1/4W = MF25
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1/2 W = MF50
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1W = MF1
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2W = MF2
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3W = MF3
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Small Size
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1/4 W = MF25S
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2/5 W = MF40SS
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1/2 W = MF50S
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1/2 W = MF50SS
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3/5 W = MF60S
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2 W = MF200S
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| TO ORDER PRODUCT |
| E mail: microohm@vividnet.com |
| Call Toll Free: 1-800-845-5167 |
| home page | product guide |
PM hot molded |
PL low ohm |
RJ high resistance |