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MFD
METAL FILM
LEADED RESISTOR

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Features
• Very tight tolerance down to +-0.02%
• Extremely low TCR down to +-5ppm/C
• High precision
• Excellent stability

Applications
• Precision Equipment
• Measurement Equipment

GENERAL SPECIFICATIONS

Model

Power
Rating
at 70C

Operating
Temp.
Range

Max.
Operating
Voltage

Max.
Overload
Voltage

Resistance Range[目]

TCR
(ppm/
C)

▽0.02%

▽0.05%

▽0.1%

0727

1/4W

-55 to
+155
C

250V

500V

10目-500K目
10目-1M目

▽5
▽10
▽15
▽25

1040

1/2W

300V

600V

CHARACTERISTICS                                                  Values in [ ] mean change in ohmic value after test

Temp. Coefficient
of Resistance

As Spec.

Resistance value at room temp. and room temp. +60C

Short Time
Overload

▽[0.5%+0.05目]

RCWV*2.5 or Max. overload voltage for 5 sec.

Insulation
Resistance

 

Apply 500VDC for 1 minute, 1000M目

Endurance
Data

▽[0.5%+0.05目]

70▽2C, Max. working voltage for 1000hours
with 1.5hours §ON§ and 0.5hours ※OFF§

Damp Heat
with Load

▽[0.5%+0.05目]

40▽2C, 90-95% R.H. Max. working voltage  for 1000hours
With 1.5hours ※ON§ and 0.5hours ※OFF§

Soldering
Ability

95% min. coverage

245▽5C for 3sec.

Resistance to
Soldering Heat

▽[0.1%+0.01目]

350▽10C for 3sec. After test leave for 3hours

Terminal
Strength

Tensile:  ̄2.5kg

Tensile strength: for 10sec.
Torsional strength: Rotated through 360﹉, 5 rotations

Pulse
Overload

▽[0.5%+0.01目]

4 times RCWV for 10000 cycles with 1sec. ※ON§
and 25 sec. ※OFF§

Temperature
Cycle

▽[0.5%+0.05目]

Low side: -55C/30min., Room temp.: 10 to 15min.
High side side: 85C/30min., Room temp.: 10 to 15min.5 cycles

Resistance
to Solvent

No deterioration of
coatings and markings

Trichroethane for 3 min. with ultrasonic

*Reference Standard:  MIL-STD-202, JIS-C 5201-1
*Storage Temperature: 25▽3C; Humidity < 80%RH

STRUCTURE AND DIMENSIONS

1

Ceramic Core(Alumina ceramic)

2

Resistor Element(Nickel alloy)

3

Terminal
(Tinned iron cap)

4

Connection

5

Lead Wire
(Tinned annealed copper wire)

6

Molding
(Exposed)

7

Marking
(Exposed based ink)

Model

L

D

H

d

Weight(g)
(1000pcs)

MFD0727

7.0▽0.3

2.7▽0.4

26▽3

0.6▽0.05

230

MFD1040

10.2▽0.3

4.0▽0.4

25▽3

0.6▽0.05

430

DERATING CURVE

ORDERING PROCEDURE EXAMPLE

Copyright©, RARA Electronics Corporation
Tel:82-32-817-4325 Fax:82-32-817-4329

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