Ultra Low Profile

Power Resistors

WDBR Series

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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

2.14

snubber circuits

WDBR1/2

WDBR1

WDBR2

WDBR3

WDBR5

WDBR7

Resistance range

ohms

12, 15, 20, 22, 25,

47, 50, 100

12, 15, 20, 22, 25, 47, 50, 100, 150

Resistance tolerance

%

10

kW

0.5

1.5

2.0

3.5

5.0

7.0

W

160

180

200

260

270

280

W

300

700

780

900

1000

1490

TCR

ppm/°C

+500 to +600

Maximum element temperature

°C

365

Ambient temperature range (heatsink)

°C

-55 to +200

V (dc/ac peak)

2500

Inductance (typical)

μH

<3

<4

<5

<6

Physical Data

Electrical Data

Dimensions in mm, weight without terminations in g

L ±0.1 W ±0.1 t ±0.1 ØD nom a nom b nom c nom Wt. nom

WDBR1/2

31.9

28.1

0.9

2.2

7.5

3.1

4.3

6.5

WDBR1

49.3

35.9

3.2

3.2

11.2

6.2

12.6

WDBR2

61

40.6

5.3

4.7

13.0

5.8

17.1

WDBR3

101.6

70

13.5

22.0

10.2

50.8

WDBR5

122

70

14.0

23.8

7.4

60.7

WDBR7

152.4

101.6

1.5

15.0

51.3

9.2

181.8

Notes:

1. For details of pulse condition see Fig. 1 in Performance Data.

2. Mounted on a 0.53°C/W heatsink with no forced air cooling, air temperature 25°C.

3. Mounted on a 0.53°C/W heatsink with 5m/s forced air cooling, air temperature 25°C.

4. Based on 100% production test, duration 2s minimum

Construction

A high integrity dielectric layer is applied to a machined

stainless steel substrate. Thick-film conductor and resistor

patterns are printed and fired, then protected with a high

temperature overglaze. The termination pads are tinned with

solder and optional terminals or leads are soldered on.

Fixing hole is located centrally except on WDBR1/2 where the dimension from

the edge by the terminations to the mounting hole centre is 16.68mm

W

L

c

b

a

Substratethickness =t

D