General-Purpose Failsafe

Moulded Wirewound Resistors

SP20/SP20F Series

Performance Data

Test

F

0

2

P

S

0

2

P

S

*

0

0

8

±

R

1

<

0

0

8

±

R

1

<

C

°

/

m

p

p

)

m

p

p

(

t

n

e

i

c

if

f

e

o

c

e

r

u

t

a

r

e

p

m

e

T

≥1R ±150

≥1R ±150

V

0

0

7

S

M

R

e

g

a

tl

o

v

g

n

i

d

n

a

t

s

h

ti

w

c

ir

t

c

e

l

e

i

D

5

%

d

a

o

lr

e

v

o

y

r

a

t

n

e

m

o

M

5

%

n

o

it

a

r

e

p

o

e

r

u

t

a

r

e

p

m

e

t

w

o

L

5

%

e

l

c

y

c

e

r

u

t

a

r

e

p

m

e

T

5

%

y

ti

d

i

m

u

H

5

%

e

fi

l

d

a

o

L

5

%

h

t

g

n

e

r

t

s

l

a

n

i

m

r

e

T

5

%

t

a

e

h

r

e

d

l

o

s

o

t

e

c

n

a

t

s

i

s

e

R

General-Purpose Failsafe

Moulded Wirewound Resistors

SP20/SP20F Series

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

96

Issue B · 03.02

Welwyn Components

Ambient Temperature (°C)

2.5

2.0

1.5

1.0

0.5

0

0

50

100

150

200

Ambient Temperature (°C)

SP20 Power Derating

SP20F Power Derating

Time (seconds)

0.1 ohm

1 ohm

10 ohm

100 ohm

1000 ohm

Power Input (watts)

SP20F Typical Fusing

SP20 and SP20F Temperature Rise

*0.1 ohm SP20F <1000 ppm.

Ordering Procedure

Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of 4000 pieces –

SP20F – 470R J I

Type

Value (use IEC62 code)

Tolerance (use IEC62 code)

J

5%

K

10%

Packing

I

Tape

4000/reel

Standard

• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

Sample Part No.

IRC Type

Resistance Range

Recognition

(First three significant figures plus fourth digit multiplier)

UL = UL1412 recognised (optional characters)

Example: 2203 = 220 Kohm

51R0 = 51 ohm

2R00 = 2.0 ohm

Tolerance

F = ±1.0%, G = ±2.0%, J = ±5.0%

RoHS Compliant (optional)

Provides clear "Lead Free" Designation

Specification

Custom design identifier for non-standard products

Ordering Data

SP20F

SP-20 Power Derating Curve

2.0

2.5

1.5

1.0

0.5

0

Ambient Temperature (°C)

0

50

100

150

200

SP-20F Power Derating Curve

2.0

2.5

1.5

1.0

0.5

0

Ambient Temperature (°C)

0

50

100

150

200

SP-20 and SP20F

Temperature Rise Chart

100

120

80

60

40

20

Power Input (watts)

0

0.5

1.0

1.5

2.0

0

1800

J

LF

XXX

SP20 / SP20F Series

General Purpose Failsafe

Molded Wirewound Resistor

SP20/SP20F Series Issue September 2010 Sheet 3 of 3

0.1

1

10

100

1000

10

15

20

25

30

35

40

45

50

55

60

Initial Power (W)

SP20F Fusing Characteristic

(Maximum & Typical Fusing Times)

Typical

- 1R0

Maximum - all values

Typical

- 470R

Make Possible

07.14

General Note

TT Electronics reserves the right to make changes in product specification without notice or liability.

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

© TT Electronics plc

www.ttelectronicsresistors.com