Through-hole resisT ors
General Type
Metal Film Resistors
Normal & Miniature Style [ MFR Series ]
FeATures
Power Rating 1/6W, 1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance 0.5%, 1%, 5%
T.C.R. 15ppm/C, 25ppm/C, 50ppm/C, 100ppm/C
DerATiNg Cur Ve
For resistors operated in ambient temperatures above 70C, power rating must be derated
iNTroDuCTioN
in accordance with the curve below.
70 155 C
The MFR Series Metal Film Resistors are
Rated Load (%)
100
manufactured using a vacuum sputtering system
80
to deposit multiple layers of mixed metal
60
alloys and passivative materials onto a carefully
40
treated high grade ceramic substrate. After a
20
helical groove has been cut in the resistive layer,
tinned connecting leads of electrolytic copper
Ambient Temperature (C)
20 40 60 80 100 120 140 160
are welded to the end-caps. The resistors are
coated with layers of blue color lacquer.
DiMeNsioNs
Unit: mm
s TYle DiMeNsio N
Normal Miniature l D h d
MFR-12 MFR25S 3.40.3 1.90.2 282.0 0.450.05
d
MFR-25 MFR50S 6.30.5 2.40.2 282.0 0.550.05
H L D
MFR-50 MFR1WS 9.00.5 3.30.3 262.0 0.550.05
MFR100 MFR2WS 11.51.0 4.50.5 352.0 0.80.05
MFR200 MFR3WS 15.51.0 5.00.5 332.0 0.80.055
Note:
eleCTriCAl ChArACTerisTiCs
s TYle MFr-12 MFr 25s MFr-25 MFr 50s MFr-50 MFr 1Ws MFr 100 MFr 2Ws MFr 200 MFr 3Ws
Power Rating at 70C 1/6W 1/4W 1/2W 1W 2W 3W
Maximum Working Voltage 200V 250V 300V 350V 400V 500V
Maximum Overload Voltage 400V 500V 600V 700V 800V 1,000V
Voltage Proof on Insulation 300V 400V 500V 700V 1,000V
Resistance Range 1 - 10M & 0 for E24 & E96 series value
Operating Temp. Range -55C to +155C
Temperature Coefficient 15ppm/C, 25ppm/C, 50ppm/C, 100ppm/C
Note: Special value is available on request
eNViroNMeNTAl ChArACTerisTiCs
Per For MANCe Tes T Tes T MeTho D APPr Aise
Shor t Time Overload IEC 60115-1 4.13 2.5 times RCWV for 5 Sec. 0.25%+0.05
Voltage Proof on Insulation IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type
Temperature Coefficient IEC 60115-1 4.8 -55C to +155C By type
Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >10,000M
Solderability IEC 60115-1 4.17 2355C for 30.5 Sec. 95% Min. coverage
No deterioration of
Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 50.5 Min. with ultrasonic
coatings and markings
Robustness of Terminations IEC 60115-1 4.16 Direct load for 10 Sec. in the direction of the terminal leads 2.5kg (24.5N)
Periodic-pulse Overload IEC 60115-1 4.39 4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off) 1.0%+0.05
Damp Heat Steady State IEC 60115-1 4.24 402C, 90-95% RH for 56 days, loaded with 0.1 times RCWV 1.5%+0.05
Endurance at 70C IEC 60115-1 4.25 702C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) 1.5%+0.05
Temperature Cycling IEC 60115-1 4.19 -55C Room Temp. +155C Room Temp. (5 cycles) 0.75%+0.05
Resistance to Soldering Heat IEC 60115-1 4.18 2603C for 101 Sec., immersed to a point 30.5mm from the body 0.25%+0.05
Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less. Revision: 201304