Ultra Precision

Metal Film Resistors

CAR series

Figure 1

Construction

Ceramic rods are coated with a metal film and plated steel

caps are force fitted. A helical cut is used to adjust the film to

its final value.

Termination wires are welded to the caps and the resistor is

protected with a specially formulated epoxy coating.

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

Ultra Precision

Metal Film Resistors

CAR series

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179

Welwyn Components

Values 10

≤ 250k

Values > 250k

Actual Performance

Actual Performance

Maximum

Typical

Maximum

Typical

Load at rated power : 1000 hrs at 70°C (or 85°C)

∆R %

0.05

0.02

0.25

0.05

Dry heat : 1000 hrs at 155°C

∆R %

0.15

0.08

1

0.2

Shelf life : 12 months at room temperature

∆R %

0.01

0.003

0.04

0.02

C

°

5

5

1

t

a

o

r

e

Z

C

°

5

5

1

t

a

o

r

e

Z

)

C

°

5

8

r

o

(

C

°

0

7

t

a

r

e

w

o

p

d

e

t

a

r

m

o

r

f

g

n

it

a

r

e

D

Short term overload

∆R %

0.01

0.001

0.08

0.01

Climatic

∆R %

0.05

0.02

0.2

0.05

6

5

/

5

5

1

/

5

5

6

5

/

5

5

1

/

5

5

y

r

o

g

e

t

a

c

c

it

a

m

il

C

Long term damp heat

∆R %

0.05

0.02

0.2

0.05

Temperature rapid change

∆R %

0.04

0.02

0.25

0.05

Resistance to solder heat

∆R %

0.02

0.003

0.05

0.005

Vibration and bump

∆R %

0.02

0.002

0.06

0.02

1

.

0

1

3

0

.

0

2

.

0

V

/

V

µ

)

y

c

n

e

u

q

e

r

f

f

o

e

d

a

c

e

d

a

n

i(

e

s

i

o

N

5

0

.

0

<

2

.

0

5

0

.

0

<

3

.

0

V

/

m

p

p

e

c

n

a

t

s

i

s

e

r

f

o

t

n

e

i

c

if

f

e

o

c

e

g

a

tl

o

V

Marking

Type reference, TCR code, resistance value and tolerance

code.

The resistance value marking conforms to IEC 62.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning fluids suitable for printed circuits.

Performance Data

Application Notes

Resistors can be supplied matched for tolerance and TCR

down to ±0.005% and ±1ppm/°C, respectively, either as

separate resistors or pre-assembled and encapsulated within a

plastic box.

The individual resistors within a set or module can be

manufactured with a tolerance of ±0.01% and a TCR of

±5ppm/°C.

52

6

6

5

Make Possible

12.14

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.

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www.ttelectronicsresistors.com