Resistors
METAL FILM RESISTORS
The WMF series Metal Film Resistors are manufactured using the latest Magnetron Vacuum Sputtering System. This ensures a very stable resistive medium having a very low temperature coefficient. The resistors are insulated with layers of light blue lacquer. The WMF series offer a wide range of power rating (0.125W, 0.25W, 0.40W, 0.50W, 1W, 2W & 3W), tolerances (0.1%, 0.5%, 1%, 2%, 5%) and TCRs (15, 25,50 & 100 ppm/ºC)
MPN
×
SPECIFICATION |
|||||
Type No. |
WMF 12 / WMF 25 M | WMF 25 / WMF 40 / WMF 50 M | WMF 50 / WMF 100 M | WMF 100 / WMF 200 M | WMF 200 / WMF 300 M |
Rated Power at 70'C |
0.125 W / 0.25 W | 0.25 W / 0.40 W / 0.50 W | 0.50 W / 1 W | 1 W / 2 W | 2 W / 3 W |
Resistance Range (E24 series) |
0.1 E to 10 Meg | 0.1 E to 10 Meg | 0.1 E to 10 Meg | 0.1 E to 10 Meg | 0.1 E to 10 Meg |
Maximum working voltage at 70'c at normal air pressure |
200V | 250V | 350V | 500V | 500V |
Maximum Over Load Voltage |
400V | 500V | 700V | 1000V | 1000V |
Operating Temperature Range |
-40 ºC to + 150ºC | -40 ºC to + 150ºC | -40 ºC to + 150ºC | -40 ºC to + 150ºC | -40 ºC to + 150ºC |
Dielectric Strength |
400V No break down Δ R max. ± 0.5% |
500V No break down Δ R max. ± 0.5% |
700V No break down Δ R max. ± 0.5% |
1000V No break down Δ R max. ± 0.5% |
1000V No break down Δ R max. ± 0.5% |
TCR RANGE | ||||
Tolerance Range |
0.1% & 0.5% | 1% | 2% | 5% |
TCR(PPW/ºC) |
15/25 | 25/50/100 | 50/100 | 100 |
CHARACTERISTICS |
||||||
Terminal Strength |
no damage Δ R max. ± 0.5% |
|||||
Resistance to soldering heat (350ºC) |
Δ R max. ± 1% | |||||
Solderability |
good tinnin no damage |
|||||
Temperature Cycling |
Δ R max. ± 0.25% | |||||
Life 1000 hours at Rated Power |
Δ R max. ± 1% | |||||
Short time overload |
Δ R max. ± 0.5% | |||||
Resistance to solvents |
no damage | |||||
E 24 Series
| 10 | 11 | 12 | 13 | 15 | 16 | 18 | 20 | 22 | 24 | 27 | 30 |
| 33 | 36 | 39 | 43 | 47 | 51 | 56 | 62 | 68 | 75 | 82 | 91 |
E 96 Series
| 100 | 102 | 105 | 107 | 110 | 113 | 115 | 118 | 121 | 124 | 127 | 130 | 133 | 137 | 140 | 143 |
| 147 | 150 | 154 | 158 | 162 | 165 | 169 | 174 | 178 | 182 | 187 | 191 | 196 | 200 | 205 | 210 |
| 215 | 221 | 226 | 232 | 237 | 243 | 249 | 255 | 261 | 267 | 274 | 280 | 287 | 294 | 301 | 309 |
| 316 | 324 | 332 | 340 | 348 | 357 | 365 | 374 | 383 | 392 | 402 | 412 | 422 | 432 | 442 | 453 |
| 464 | 475 | 487 | 499 | 511 | 523 | 536 | 549 | 562 | 576 | 590 | 604 | 619 | 634 | 649 | 665 |
| 681 | 698 | 715 | 732 | 750 | 768 | 787 | 806 | 825 | 845 | 866 | 887 | 909 | 931 | 953 | 976 |
DIMENSIONS (in mm)
TYPE WMF 12/WMF 25M |
H = 26 ± 2 | L = 3.3 ± 0.2 | D = 1.7 ± 0.1 | d = 0.45 ± 0.05 |
TYPE WMF 25/TYPE WMF 40/WMF 50M |
H = 26 ± 2 | L = 6.0 ± 0.4 | D = 2.2 ± 0.1 | d = 0.50 ± 0.05 |
WMF 50/WMF 100M |
H = 26 ± 2 | L = 9.0 ± 0.5 | D = 3.2 ± 0.2 | d = 0.60 ± 0.05 |
TYPE WMF 100/WMF 200M |
H = 26 ± 2 | L = 11 ± 1.0 | D = 4.3 ± 0.5 | d = 0.65 ± 0.05 |
TYPE WMF 200/WMF 300M |
H = 26 ± 2 | L = 15 ± 1.0 | D = 5.0 ± 0.5 | d = 0.75 ± 0.05 |
| Colour | lst figure | 2nd figure | 3rd figure | Multiplier | Tolerance |
|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | 1 | |
| Brown | 1 | 1 | 1 | 10 | ± 1% |
| Red | 2 | 2 | 2 | 100 | ± 2% |
| Orange | 3 | 3 | 3 | 1,000 | |
| Yellow | 4 | 4 | 4 | 10,000 | |
| Green | 5 | 5 | 5 | 100,000 | ± 0.5% |
| Blue | 6 | 6 | 6 | 1,000,000 | ± 0.25% |
| Violet | 7 | 7 | 7 | 10,000,000 | ± 0.1% |
| Gray | 8 | 8 | 8 | ||
| White | 9 | 9 | 9 | ||
| Gold | 0.1 | ± 5% | |||
| Silver | 0.01 | ± 10% |
Electronic Products
Ohm's Law Calculator
Enter any two known values and press "Calculate" to solve for the others.
Volts (V)
Watts (W)
Calculate
Voltage (V) = Current (I) * Resistance (R)
Power (P) = Voltage (V) * Current (I)
