Fusible Metal Film

Resistors

FA8025 series

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

Issue B · 03.02

Welwyn Components

154

b

6

6

c

1.4 mm

Packaging

The preferred method of packaging is taped and ammo

packed, see figure 1 for critical dimensions.

Alternative packaging is available by special request.

Lead Formed resistors can also be supplied. Standard options

of Lancet, Radial and Goalpost forming are shown in Lead

Form Information section.

Figure 1

Normal rated

power

Fusing

Time

(secs)

Min power for

guaranteed

fusing

Max sale

fusing

power

Min fusing time

Max fusing time

Initial Power (watts)

Graph 1

Graph 2

Graph 3

Predicting Fusing Time For Defined Power Input

Graphs 1 to 3.

Fusing:

After fusing the final resistance value will be 50 times the

initial value. See graph for explanation of fusing curves.

Fusible Resistors: Typical Fusing Window

Graph 4.

l

a

c

i

p

y

T

m

u

m

i

x

a

M

Load: 1000 hours at 70˚C

5

.

0

2

%

R

Shelf life: 12 months at room temperature

2

.

0

5

.

0

%

R

C

˚

5

5

1

t

a

o

r

e

z

C

˚

0

7

t

a

r

e

w

o

p

d

e

t

a

r

m

o

r

f

g

n

i

t

a

r

e

D

Temperature rapid change

2

.

0

5

.

0

%

R

Resistance to solder heat

2

.

0

5

.

0

%

R

Performance Data

Type

FA8225

FA8325

FA8425

Ammopack

5000

2500

1000

Standard Quantities Per Package

Type

FA82*

FA82/FA83

FA84

b

265267

c5

5

10

Issue C · 01.07