Precision Metal Film Resistors
Materials and Features:
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EIA standard color coding
Flame retardant type available
Low noise & Voltage coefficient
Low temperature coefficient
Wide precision range in small package
Very low or very high ohmic values available upon request
Nichrome resistor element provides stable performance in various environments
Multiple epoxy coating on vacuum-deposited metal film provides superior moisture protection
Explanation of Part Numbers:
MF 25 C 1001 F T XX
1
2
3
4
5
6
7
1 Style:
MF -
Metal Film
2 Wattage:
08 = 1/8 watt
60 = .6 watt
25 = 1/4 watt
100 = 1 watt
40 = .4 watt
200 = 2 watt
50 = 1/2 watt
3 Temperature Coefficient:
T = ± 15 ppm
*C = ± 50 ppm (Std)
E = ± 25 ppm
D = ± 100 ppm
* Standard TC provided unless otherwise specified in part number.
4 Nominal Resistance Value:
E24 Series (5% Tolerance)
The first two digits are significant figures of resistance and the third digit denotes the number of
zeros (decimal point is expressed by the letter “R”).
i.e. 102 = 1k
Ω
1R2 = 1.2
Ω
E96 Series (1% Tolerance)
The first three digits are significant figures of resistance and the fourth digit denotes the number
of zeros.
i.e. 1001 = 1kΩ
10R0 = 10Ω
5 Tolerance:
A = ± .05%
D = ± .5%
B = ± .1%
F = ± 1%
B = Bulk
A = Ammo
C = ± .25%
G = ± 2%
J = ± 5%
6 Packaging:
T = Tape & Reel
TB = Tape & Box
7 Lead Forming:
PN = Panasert Type
PA1 = Avisert Type 1
PA2 = Avisert Type 2 PA3 = Avisert Type 3
* For all other requests, please consult factory.
Dimension:
7267 Coldwater Canyon, North Hollywood. California 91605 • Phone (818) 765-8300 • Toll Free (800) 827-7422 • Fax (818) 765-2387
K41
Precision Metal Film Resistors
Performance Specifications
Characteristics
Test Methods
Natural resistance change per temp. degree centigrade.
R
2
- R
1
x 10
6
(PPM / °C)
R
1
(t
2
-t
1
)
R
1
: Resistance value at room temperature (t
1
)
R
2
: Resistance value at room temp. plus 100 °C (t
2
)
Dielectric
withstanding voltage
JIS - C - 5202 5.7
Resistors shall be clamped in the trough of a 90° metallic V- block
and shall be tested at AC potential respectively specified in the
above list for 60+ 10 / -0 seconds.
Resistance change after continuous five cycles for duty cycle
specified below:
Step
Temperature
Time
Temperature cycling
JIS - C - 5202 7.4
1
2
3
4
Short - time overload
JIS - C - 5202 5.5
-55°C ± 3°C
Room temp
+ 155°C ± 3°C
Room temp
30 minutes
10~15 minutes
30 minutes
10~15 minutes
Resistance change rate is
N: ± (1% + 0.05
Ω)
S: ± (2% + 0.05
Ω)
No evidence of mechanical damage
Resistance change rate is
N: ± (2% + 0.05
Ω)
S: ± (5% + 0.05
Ω)
No evidence of mechanical damage
Resistance value
Less than 100KΩ
100KΩ or more
Resistance value
Less than 100KΩ
100KΩ or more
vR/R
± 5%
± 10%
vR/R
± 5%
± 10%
No evidence of flashover, mechanical
damage, arcing or insulation break
down.
Limits
Temperature coefficient
JIS - C - 5202 5.2
± 350 PPM / °C
Resistance change rate is
± 2% + 0.05Ω).
No evidence of mechanical damage
Permanent resistance change after the application of a potential
of 2.5 times RCWV or the max. overload voltage respectively
specified in the above list, whichever less for 5 seconds.
Pulse overload
JIS - C - 5202 5.8
Resistance change after 10,000 cycles (1 second “on”, 25 seconds
“off”) at 4 times RCWV or the max. pulse overload voltage.
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 chamber controlled at 40°C ± 2°C and 90
to 95% relative humidity.
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.
Direct load :
Resistance to a 2.5 kgs 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 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 alternat-
ing direction for a total of 3 rotations.
Permanent resistance change when leads immersed to 3.2 mm
to 4.8 mm from the body in 350°C ± 10°C solder for 3 ± 0.5 seconds
The area covered with 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
Specimens shall be immersed in a bath of trichloroethane
completely for 3 minutes with ultrasonic.
Resistors shall resist flaming or arcing when overloaded up to 16
times RCWV.
Load life
JIS - C - 5202 7.10
Terminal strength
JIS - C - 5202 6.1
No evidence of mechanical damage
Resistance to soldering heat
JIS - C - 5202 6.4
Solderability
JIS - C - 5202 6.5
Resistance to solvent
JIS - C - 5202 6.9
Flame retardant
JIS - C - 5202 7.12
Resistance change rate is ± ( 1% + 0.05W ).
No evidence of mechanical damage
95% coverage Min.
No deterioration of protective
coatings and markings
No evidence of flaming or arcing
*RCWV = Rated Continuous Working Voltage =
Rated Power x Resistance Value
7267 Coldwater Canyon, North Hollywood. California 91605 • Phone (818) 765-8300 • Toll Free (800) 827-7422 • Fax (818) 765-2387
K43
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