Ceramic Case Resisters –

Wirewound / Metal Oxide

SQP Series

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

Issue C · 07.06

Welwyn Components

Maximum

Load at rated power (1000hrs at 70˚C)

5

0

.

0

+

%

5

%

R

h

p

a

r

G

e

e

S

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

Short term overload *

5

0

.

0

+

%

2

%

R

Damp heat steady state (56 days, 40˚C,

90% RH)

5

0

.

0

+

%

2

%

R

Temperature rapid change

5

0

.

0

+

%

2

%

R

Resistance to solder heat

5

0

.

0

+

%

1

%

R

Pulse handling

Data available by request

71

Construction

A high purity ceramic rod, with force fit end caps onto which is wound a wire element: or a deposited metal oxide film

(depending on value). The element is fitted into a ceramic case with fireproof insulation cement.

Termination Details

Material

The tinned copper lead wires are internally welded to the resistance element end caps.

Solderability

The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2

Strength

The terminations meet the requirements of IEC 86.2.21

Marking

Type reference, resistance value and tolerance are legend marked onto the upper surface.

Flammability

The resistor will not burn or emit incandescent particles under any condition of applied temperature or

overload.

Solvent resistance

The body protection and marking are resistant to all normal industrial solvents suitable for printed

circuits.

Performance Data

*(Wirewound:: the lower of 5x rated power, or 2.5x LEV for 5 secs. Metal Oxide:: the lower of 6.25x rated power, or 2.5x LEV for 5 secs)

P

Metal Oxide types

100%

50%

0%

-30

70

155

240

T˚C

118%

P

Wirewound types

100%

50%

0%

-30

25

70

155

240

T˚C

Ordering Procedure

Example: 5,000 SQP3 at 1.2 kilohms and 5% tolerance in standard bulk pack option-

Model

SQP3 –

1K2

J

B10

Value (use IEC62 code)

Tolerance (use IEC62 code)

J 5%

Packing

CODE

Family

Qty/

Carton

B5

SQP2,3,5

5000

Bulk

B15

Pack

SQP7,10

1500

B1

SQP15,20

1000

Issue D · 01.07

Resistors

B5