Packaging

All MFR resistors are supplied tape packed ready for loading

on to automatic sequencing and insertion machines.

Component wires will not protrude beyond the outside edge

of the tapes.

Alternative packaging available by request.

Lead Formed resistors can also be supplied. Standard options

of Lancet, Radial and Goalpost forming are available.

Graph 3 – Load for 1000 hours at 70°C: maximum changes

Construction

The resistance element is a precisely controlled thin film of

metal alloy sputtered on to a high purity ceramic core,

protected by a moisture-resistant, high dielectric strength

coating applied so that terminations remain completely clear.

Terminations

Material

Hot tin dipped 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

0.5% and 1% tolerance resistors are colour coded with 5

bands, 2% tolerance has 4. IEC 62 colours are used.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

52

6

6

5

Metal Film Resistors

MFR Series

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

Issue D · 05.07

Welwyn Components

137

CECC 40101-019

CECC 40101-803

Actual Performance

Requirements

Requirements

Maximum

Typical

Load at commercial rating :

1000 hours at 70°C

3

h

p

a

r

G

e

e

S

9

.

0

%

R

Load at CECC rating :

1000 hours at 70°C

R %

2

1

0.5

See Graph 3

Shelf life :

12 months at room temperature

R %

Not specified

Not Specified

0.1

0.07

C

°

5

5

1

t

a

o

r

e

z

C

°

5

5

1

t

a

o

r

e

z

g

n

it

a

r

e

D

Short term overload

R %

0.5

0.25

0.25

0.01

Climatic

R %

2

1

0.5

0.2

6

5

/

5

2

1

/

5

5

6

5

/

5

2

1

/

5

5

y

r

o

g

e

t

a

c

c

it

a

m

il

C

Long term damp heat

R %

2

1

0.5

0.3

Temperature rapid change

R %

0.5

0.25

0.25

0.04

Resistance to solder heat

R %

0.5

0.25

0.25

0.07

Vibration and bump

R %

0.5

0.25

0.1

0.01

Noise. (in a decade of frequency)

µV/V

Not Specified

Not Specified

0.1

0.07

Insulation resistance

ohms

>1G

>1G

>1G

>1G

n

i

m

0

0

7

n

i

m

0

0

7

n

i

m

0

0

5

n

i

m

0

0

7

s

tl

o

v

f

o

o

r

p

e

g

a

tl

o

V

t

s

e

u

q

e

r

n

o

p

u

e

l

b

a

li

a

v

a

a

t

a

D

g

n

il

d

n

a

h

e

s

l

u

P

Performance Data - Type MFR 5