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Metal Film Resistors |
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Metal Film Resistors (MFRs) |
| The WM Series of Watts Metal Film Resistors are manufactured using the latest Magnetron Vacuum Sputtering System. This ensures a stable resistive medium having a very low temperature coefficient. The resistors are insulated with layers of light blue lacquer. The WM Series offer a wide range of power rating (0.20 W, 0.25 W , 0.35 W , 0.5 W, 1 W , 2 W and 3 W), tolerances (1%, 2% and 5%) and TCRs (50 and 100 ppm/oC) |
| Click here for the Manufacturers Code (Type Reference) of Watts make MFRs |
| Specifications | Characteristics | TCR | E24 Series | E96 Series | Dimensions | Colour Code |
| WATTS TYPE | WM12 | WM25M | WM25 | WM50 | WM50M | WM100 | WM100M | WM200 | WM200M | WM300M |
|---|---|---|---|---|---|---|---|---|---|---|
| Rated Power at 70 Deg C | 0.20W | 0.25W | 0.35W | 0.5W | 0.5W | 1W | 1W | 2W | 2W | 3W |
| Resistance Range | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M | 10E to 1M |
| Max.Voltage @70oC at normal air pressure | 200V | 250V | 250V | 350V | 350V | 500V | 500V | 500V | 500V | 500V |
| Operating Temperature Range | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC | -40oC to +150oC |
| Tolerance Range | 1% | 2% | 5% |
| TCR Range (ppm/oC) |
50/100 | 50/100 | 100 |
| WATTS TYPE | WM12 | WM25 | WM25M | WM50 | WM50M | WM100 | WM100M | WM200 | WM200M | WM300M | WATTS TYPE |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dielectric Strength | 450V No breakdown Δ R max. 0.5% | 500V No breakdown Δ R max. 0.5% | 500V No breakdown Δ R max. 0.5% | 700V No breakdown Δ R max. 0.5% | 700V No breakdown Δ R max. 0.5% | 1000V No breakdown Δ R max. 0.5% | 1000V No breakdown Δ R max. 0.5% | 1000V No breakdown Δ R max. 0.5% | 1000V No breakdown Δ R max. 0.5% | 1000V No breakdown Δ R max. 0.5% | Dielectric Strength |
| Terminal Strength | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | Terminal Strength |
| Soldering heat (350oC) Resistance | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Soldering heat (350oC) Resistance |
| Solderability | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Good tinning. No damage | Solderability |
| Temperature Cycling -40oC to +150oC | Δ R max. 0.25% | Δ R max. 0.25% | Δ R max. 0.25% | Δ R max. 0.25% | Δ R max. 0.25% Top |
Δ R max. 0.25% Top |
Δ R max. 0.25% Top |
Δ R max. 0.25% Top |
Δ R max. 0.25% Top |
Δ R max. 0.25% Top |
Temperature Cycling -40oC to +150oC |
| Life 1000 Hours at Rated Power | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Δ R max. 1% Top |
Life 1000 Hours at Rated Power |
| Short Time Overload | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Δ R max. 0.5% | Short Time Overload |
| Vibration | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | No damage Δ R max. 0.5% | Δ R max. 0.5% | Vibration |
| Resistance to Solvents | No damage | No damage | No damage | No damage | No damage | No damage | No damage | No damage | No damage | No damage | Resistance to Solvents |
| WATTS TYPE | WM12 | WM25M | WM25 | WM50 | WM50M | WM100 | WM100M | WM200 | WM200M | WM300M | WATTS TYPE |
| 10 | 11 | 12 | 13 | 15 | 16 | 18 | 20 |
| 22 | 24 | 27 | 30 | 33 | 36 | 39 | 43 |
| 47 | 51 | 56 | 62 | 68 | 75 | 82 | 91 |
| 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 |
| Type WM12 / WM 25M | H = 28±1 | L = 3.2±0.2 | D = 2.0±0.1 | d = 0.5±0.02 | |||
| Type WM25 / WM 50M | H = 28±1 | L = 6.0±0.4 | D = 2.5±0.1 | d = 0.6±0.02 | |||
| Type WM50 / WM 100M | H = 28±1 | L = 9.5±0.5 | D = 3.2±0.2 | d = 0.6±0.02 | |||
| Type WM100 / WM 200M | H = 28±1 | L = 11±1.0 | D = 4.3±0.5 | d = 0.8±0.02 | |||
| Type WM200 | H = 28±1 | L = 16±1.0 | D = 5.5±0.5 | d = 0.8±0.02 | |||
| Type WM300M | H = 28±1 | L = 16±1.0 | D = 5.5±0.5 | d = 0.8±0.02 | |||
| Colour | 1st Figure | 2nd Figure | 3rd Figure | Multiplier | Tolerance | TCR |
|---|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | 1 | 200PPM | |
| Brown | 1 | 1 | 1 | 10 | ±1% | 100PPM |
| Red | 2 | 2 | 2 | 100 | ±2% | 50PPM |
| Orange | 3 | 3 | 3 | 1000 | ||
| Yellow | 4 | 4 | 4 | 10,000 | 25PPM | |
| Green | 5 | 5 | 5 | 100,000 | ||
| Blue | 6 | 6 | 6 | 1,000,000 | ||
| Violet | 7 | 7 | 7 | 10,000,000 | ||
| Gray | 8 | 8 | 8 | |||
| White | 9 | 9 | 9 | |||
| Gold | 0.1 | ±5% | ||||
| Silver | 0.01 | |||||
| Specifications | Characteristics | TCR | E24 Series | E96 Series | Dimensions | Colour Code |
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