Kusum Enterprises Pvt. Ltd.
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Metal Film Resistors

DATA SHEET
Professional Grade Resistors Produced by Fully Automated Process
Tin Plated Copper Wire Ensures Excellent Solderability
Solvent Proof Colour Code Marketing
Standard Tolerance as 0.1%, 1%, 2%, & 5%
Conforms to JSS 50401-RFGP-2
ERTL, CACT, ITI Approved
Very Low TCR as 5ppm also available

metal-film-resistors



Style Power Resistance at 70°C Dimensions in mm Max Working Voltage (V) Max Overload Voltage (V) Rasistance Range
L D d H (Min)
KMR-16 0.16W 3.7±0.4 1.8±0.2 0.45±0.02 28 200 400 1Ω-10M
KMR 25M 0.25W 3.7±0.4 1.8±0.2 0.45±0.02 28 250 500 1Ω-1M
KMR 25 0.25W 6.5±0.5 2.3±0.2 0.45±0.02 27 250 500 1Ω-10M
KMR 50M 0.5W 6.5±0.5 2.3±0.2 0.45±0.02 27 350 700 1Ω-10M
KMR 50 0.5W 9±1 3.4±0.5 0.56±0.02 25 350 700 1Ω-10M
KMR 100 1W 12±1 5.0±0.5 0.68±0.02 30 500 1000 1Ω-10M
KMR 200 2W 16±1 5.5±0.5 0.80±0.03 28 500 1000 1Ω-10M
*(Rated Continuous Working Voltage); ?P X R or Maximum Working Voltage whichever is low.
** Maximum Overload Voltage: RCWC & 2.5 for 5 sec or Maximum overloads voltage whichever is low.

metal-film-resistor

Characteristics Test Methods Limits
D C Resistance Resistors are tested with standard specified voltages for its Ohmic values to check the specified tolerance. The Resistors shall be within specified tolerance limits.
Short Time Overload The Resistors shall be subjected to 2.5 times the Rated Voltage or Maximum overload voltage (whichever is low) for a duration of 5 secs. ? R % = ± 0.5% (+ 0.05 ?)
Temp - Coefficient

The Resistors value shall be checked at 2 temp. i.e. one At Ambient & the final at Amb + 100? C. The TCR is then Calculated as :

PPM
25 PPM /?C
50 PPM /?C
100 PPM /?C
200 PPM / ?C
Rated Load A Rated Continuous Working Voltage or Maximum Wkg. Voltage whichever less shall be applied to the resistors for a duration of 2 Hrs. ? R % =  ± 0.5% Max
Solderability A solder bath is maintained at 230? C. The specimen leads are immersed in the bath & withdrawn within 3 secs. A suitable flux is used during the test. A fresh solder shall cover the specimen leads by Min. 95% coverage.
Resistance to solder heat A solder bath is maintained at 350? C. The specimen leads are subjected to the bath for a duration of 10 secs. ? R % = ± 1 % Max
Resistance to Solvents The specimen shall be subjected to IPA for duration of 1 min. 10 strokes of hard brush shall be applied. The test shall be conducted 3 times. The colour code marking shall remain legible.
Die-electric Strength A foil is wrapped around the specimen body. A voltage of 300 V @ 0.5 ma shall be applied between both the terminals of the specimen for a duration of 1 min. There shall be no flash over or break down.
Terminal Strength Pull Test: The resistors leads shall be pulled using 5 N force Bend Test: The resistor leads are bend through 180? three times. There shall be no damage.
Load Life The specimen shall be subjected to an ambient of 70?C for duration of 1000 Hrs. The specimen shall also be loaded for full power dissipation. The duty cycle shall be 1½ Hr. On ½ Hr. Off. ? R % = ± 2 % Max
Steady State Humidity The shall be subjected to an amb. Of 40?C with RH as 95%, for a duration of 56 days. A small DC voltage shall be so applied that the specimen shall dissipate 1% of the rated power. ? R % = ± 2 % Max

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