product guide
METAL OXIDE FILM FIXED RESISTOR
FLAME PROOF
Resistance Tolerance: ± 5%

Resistor Color Code Reader
Normal Size
Style Dimensions (mm) Max.
Working Voltage
Max.
Overload
Voltage
Dielectric
Withstanding
Voltage
Resistance
Range
L Max D Max H ±3 d + 0.02
-0.05
MOR-1/4W 7.5 2.5 28 0.6 250V 400V 250V 0.3 ~ 50K
MOR-1/2W 10.0 4.0 28 0.6 250V 400V 250V 0.3 ~ 50K
MOR-1W 12.0 5.0 28 0.7 350V 600V 350V 0.3 ~ 50K
MOR-2W 16.0 5.5 28 0.8 350V 600V 350V 0.3 ~ 50K
MOR-3W 17.5 6.5 28 0.8 500V 800V 500V 5 ~ 100K
MOR-5W 26.0 8.5 38 0.8 750V 1000V 750V 5 ~ 150K
MOR-7W 32.0 8.5 38 0.8 750V 1000V 750V 20 ~ 150K
MOR-8W 41.0 8.5 38 0.8 750V 1000V 750V 30 ~ 200K
MOR-9W 54.0 8.5 38 0.8 750V 1000V 750V 50 ~ 200K

Small Size
Style Dimensions (mm) Max.
Working Voltage
Max.
Overload
Voltage
Dielectric
Withstanding
Voltage
Resistance
Range
L Max D Max H ±3 d + 0.02
-0.05
MOR-1/2W-S 7.5 2.5 28 0.6 250V 400V 250V 0.3 ~ 50K
MOR-1W-S 10.0 4.0 28 0.7 350V 600V 350V 0.3 ~ 50K
MOR-2W-S 12.0 5.0 28 0.7 350V 600V 350V 0.3 ~ 50K
MOR-3W-S 16.0 5.5 28 0.8 350V 600V 350V 0.3 ~ 50K
MOR-5W-SS 17.5 6.5 28 0.8 500V 800V 500V 5 ~ 100K
MOR-5W-S 25.0 8.0 38 0.8 500V 800V 500V 0.22 ~ 150K
* Too low or too high ohmic value can be supplied on a case to case basis.

Performance Specifications
Characterisitcs Test Methods Limits
Temperature coefficient
JIS -C -5202 5.2
Natural resistance change per temp. degree centigrade
R1 -R2 x 10° (PPM/°C)
R1 (t2 - t1)

R1: Resistance value at room temperature (t1)
R2: Resistance value at room temp. +100°C (t2)
Test pattern: Room temp., Room temp. +100°C
±350PPM/°C
Dielectric withstanding
voltage
JIS - C - 5202 5.7
Resistors shall be clamped in the trough of a 90° metalic
V-block and shall be tested at AC potential respectively
specified in the above list for 60 +10 / -0 seconds.
No evidence of flashover, mechanical damage, arcing or insulation break down.
Temperature cycling
JIS - C - 5202 7.4
Resistance change after continuous five cycles for duty cycle specified below:
Step Temperature Time
1 -55°C ± 3°C 30 mins
2 Room temp. 10 - 15 mins
3 +155°C ± 2°C 30 mins
4 Room temp. 10 - 15 mins
Resistance change rate is ± (2% +0.05 ) Max. with no evidence of mechanical damage
Humidity (steady state)
JIS - C - 5202 7.5
Temporary resistance change after a 240 hour exposure in a humidity test chamber controlled at 40°C ± 2°C and 90-95% relative humidity. Resistance change rate is ± (2%+0.05) Max. with no evidence of mechanical damage.
Short-time overload
JIS - C - 5202 5.5
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. Resistance change rate is
N:
± (1%+0.05) Max.
S:
± (2%+0.05) Max.
with no evidence of mechanical damage.
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. Resistance change rate is
N:
± (2%+0.05) Max.
S:
± (5%+0.05) Max.
with no evidence of mechanical damage.
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 test chamber controlled at 40°C ± 2°C and 90-95% relative humidity. Resistance change rate is ± (5%+0.05) Max. with no evidence of mechanical damage.
Load life
JIS - C - 5202 7.10
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. Resistance change rate is ± (5%+0.05) Max. with no evidence of mechanical damage
Terminal strength
JIS - C - 5202 6.1
Direct load: Resistance to a 2.5 kg 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 a 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 alternating direction for a total of 3 rotations.
No evidence of mechanical damage
Resistance to soldering
heat JIS - C - 5202 6.4
Permanent resistance change when leads immersed to 3.2 - 4.8 mm from the body in 350°C ± 10°C solder for 3 ± 0.5 sec. Resistance change rate is ± (1%+0.05) Max. with no evidence of mechanical damage.
Solderability
JIS - C - 5202 6.5
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
95% coverage min.
Resistance to solvent
JIS - C - 5202 6.9
Specimens shall be immersed in a bath of trichroethane completely for 3 minutes with ultrasonic. No deterioration of protective coatings and markings
Flame retardent
JIS - C - 5202 7.12
Resistors shall resist flaming or arcing when overloaded up to 16 times RCWV. No evidence of flaming or arcing.

Derating Curve Heat Rise Chart
ORDERING INFORMATION
Example: 1W 10k 5%
MOR-1W
1002
J
Type
Resistance
4 digit <100 ohm use R for decimal. >100 ohm 4th digit is multiplier.
Tolerance
J = 5%
G = 2%
TO ORDER PRODUCTS
E mail: microohm@mail.com
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