Fusible Metal Film

Resistors

FM Series

FM1

0

.

1

5

.

0

5

2

.

0

s

t

t

a

w

C

˚

0

7

t

a

g

n

i

t

a

r

r

e

w

o

P

5

K

1

-

2

R

0

K

7

2

-

1

R

0

K

0

1

-

1

R

0

s

m

h

o

e

g

n

a

r

e

c

n

a

t

s

i

s

e

R

0

5

3

0

5

3

0

5

2

s

t

l

o

v

e

g

a

t

l

o

v

t

n

e

m

e

l

e

g

n

i

t

i

m

i

L

0

5

2

C

˚

/

m

p

p

R

C

T

5

%

e

c

n

a

r

e

l

o

t

e

c

n

a

t

s

i

s

e

R

Standard values

E24 preferred

0

0

1

0

2

1

0

5

1

t

t

a

w

/

C

˚

e

c

n

a

d

e

p

m

i

l

a

m

r

e

h

T

5

5

1

o

t

5

5

-

C

˚

e

g

n

a

r

e

r

u

t

a

r

e

p

m

e

t

t

n

e

i

b

m

A

General Note

Welwyn Components reserves the right to make changes in product specification without notice or liability.

All information is subject to Welwyn’s own data and is considered accurate at time of going to print.

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Electrical Data

Issue B · 03.02

A subsidiary of

TT electronics plc

Welwyn Components

164

Dimensions (mm) & Weight (g)

PCB

Min.

mounting

bend

Type

L max

D max

f min

d nom

centres

radius

Wt. nom

6.2

2.3

21.0

0.6

10.2

0.6

0.3

9.0

3.4

19.6

0.8

12.7

1.2

0.6

FM1

12.5

4.2

17.8

0.8

18.4

1.2

0.9

Physical Data

L

D

f

d

Construction

The metal film is deposited on a high purity ceramic rod. End

caps are force fitted and termination wires welded to the

caps. The resistive film is adjusted to the required value by a

special helical cut; finally the cement protection is applied to

the resistor body and marked with indelible ink.

Terminations

Material

Solder-coated copper wire.

Strength

The terminations meet the requirements of

IEC 68.2.21.

Solderability

The terminations meet the requirements of

IEC 115-1, Clause 4.17.3.2.

Marking

Resistors are colour coded with five bands. Four of the bands

are used to indicate value and tolerance, with IEC 62 colours

being used. A fifth yellow band denotes constant voltage

fusibility.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

Flammability

The resistors will not burn or emit incandescent particles

under any condition of applied temperature or power

overload.

2.5

Issue C · 01.07