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Watts Electronics Pvt. Ltd. |
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Carbon and Metal Film Resistors |
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Carbon Film Resistors (CFRs) |
| The WC Series of Watts Carbon Film Resistors are manufactured using mechanised high vacuum carbonising plants. This ensures a stable resistive film. The resistors are insulated with layers of light brown lacquer. The WC Series offer a wide range of power ratings - 0.20 W, 0.25 W , 0.35 W , 0.5 W, 1 W , 2 W and 3 W with a tolerance of + - 5%. Click here for the Manufacturers Code (Type Reference) of Watts make CFRs |
| Specifications | Characteristics | E24 Series | Dimensions | Colour Code |
| WATTS TYPE | WC12 | WC25M | WC25 | WC50 | WC50M | WC100 | WC100M | WC200 | WC200M | WC300M |
|---|---|---|---|---|---|---|---|---|---|---|
| Rated Power at 70 Deg C | 0.20W | 0.25W | 0.35W | 0.5W | 0.5W | 1W | 1W | 2W | 2W | 3W |
| Resistance Range (E24 Series) |
1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M | 1E to 10M |
| Tolerance | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% | + - 5% |
| 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 |
| WATTS TYPE | WC12 | WC25 | WC25M | WC50 | WC50M | WC100 | WC100M | WC200 | WC200M | WC300M | 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. 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 |
Temperature Cycling -40oC to +150oC |
| Life 1000 Hours at Rated Power | Δ R max. 3% | Δ R max. 3% | Δ R max. 3% | Δ R max. 3% | Δ R max. 3% Top |
Δ R max. 3% Top |
Δ R max. 3% Top |
Δ R max. 3% Top |
Δ R max. 3% Top |
Δ R max. 3% Top |
Life 1000 Hours at Rated Power |
| Short Time Overload | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | Δ R max. 1% | 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 | WC12 | WC25M | WC25 | WC50 | WC50M | WC100 | WC100M | WC200 | WC200M | WC300M | 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 |
| Type WC12 / WC 25M | H = 28±1 | L = 3.2±0.2 | D = 2.0±0.1 | d = 0.5±0.02 | |||
| Type WC25 / WC 50M | H = 28±1 | L = 6.0±0.4 | D = 2.5±0.1 | d = 0.6±0.02 | |||
| Type WC50 / WC 100M | H = 28±1 | L = 9.5±0.5 | D = 3.2±0.2 | d = 0.6±0.02 | |||
| Type WC100 / WC 200M | H = 28±1 | L = 11±1.0 | D = 4.3±0.5 | d = 0.8±0.02 | |||
| Type WC200 | H = 28±1 | L = 16±1.0 | D = 5.5±0.5 | d = 0.8±0.02 | |||
| Type WC300M | H = 28±1 | L = 16±1.0 | D = 5.5±0.5 | d = 0.8±0.02 | |||
| Colour | 1st Figure | 2nd Figure | Multiplier | Tolerance |
|---|---|---|---|---|
| Black | 0 | 0 | 1 | |
| Brown | 1 | 1 | 10 | |
| Red | 2 | 2 | 100 | |
| Orange | 3 | 3 | 1000 | |
| Yellow | 4 | 4 | 10,000 | |
| Green | 5 | 5 | 100,000 | |
| Blue | 6 | 6 | 1,000,000 | |
| Violet | 7 | 7 | 10,000,000 | |
| Gray | 8 | 8 | ||
| White | 9 | 9 | ||
| Gold | 0.1 | ±5% | ||
| Silver | 0.01 | |||
Approvals |
|
Watts make Carbon Film Resistors (CFRs) have been approved by many leading OEMs in different sectors of electronics. These have also been tested at ERTL of Dept. of Electronics. Watts make high-wattage carbon film resistors (1W and 2W) have been approved by both LCSO and CACT. Watts make 1/4 W + - 1% 100 ppm Metal Film Resistors have been approved by LCSO for use in Defence sector. Further, Watts make 1/8 W and 1/4 W MFRs have also been approved by CACT for use in Telecom sector. The entire range of Watts MFRs have been approved by C-DOT for use in rural automatic exchanges, main automatic exchanges and other equipment developed as per C-DOT design. LCSO: Electronic Components Standardisation Organisation under Ministry of Defence Govt. of India. CACT: Component Approval Centre Telecommunications under BSNL Govt. of India. C-DOT: Centre for Development of Telematics. |
Some of our Major Customers in different sectors of Electronics: |
|
Consumer Electronics: BPL Limited, Videocon Appliances Ltd., UMS Radio Factory, Sparrow Electronics, V-Guard, Honda Siel Telecom: ITIs, HTL Ltd., Tata Telecom, Accord Communications, ARM. Industrial Electronics: BHEL, Controls and Drives, ECIL, Pyrotech Test and Measuring Instruments: Aplab, Selectron Process Controls, Vital Electronics, Instrumentation Ltd. Automobile: TELCO, Bajaj Auto, Industrial Electronics Ltd., Mahindra and Mahindra STD Call Monitors: Linkwell Telesystems, Metascan Electronic Energy Meters: Genus, Datapro Power Factor Correction Capacitors: Epcos, Jaivic Electronic Ballast and CFL Adaptors: Asian Electronics, Crompton Greaves, Intelux Electronics Pvt. Ltd |
| Carbon Film Resistors | Metal Film Resistors |
| Approvals | Quality System | Price List | Customers |
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