Pulse duration (seconds)

Pulse duration (seconds)

These high-power low resistance chip resistors are designed to dissipate heat efficiently

through the land patterns on circuit boards. The actual temperature of the surface of the

resistor is dependent upon the dimensions and the shape of the land patterns.

0

0

20

40

60

80

100

120

160

180

200

220

5

10

15

20

25

RL3720W（Power rating 1Ｗ）

W（mm）

1W applied

0.75W

applied

0.5W applied

W

Chip resistors

L

(27mm)

Land pattern

Land area（S）＝Ｗ・Ｌ

0

0

20

40

60

80

100

120

160

180

200

220

5

10

15

20

25

RL7520W（Power rating 2Ｗ）

W（mm）

2W applied

1W applied

0.5W applied

W

Chip resistors

Land pattern

Land area（S）＝Ｗ・Ｌ

L

(27mm)

0

0

50

100

150

200

250

300

10

20

30

RL3720W（Power rating 0.5Ｗ）

L（mm）

0.5W applied

0.25W applied

W

（4.15mm）

Chip resistors

L

Land pattern

0

0

50

100

150

200

250

300

10

20

30

RL7520W（Power rating 1Ｗ）

L（mm）

1W applied

0.75W applied

0.5W applied

0.25W applied

W

（7.9mm）

Chip resistors

L

Land pattern

0.1

0

1

2

3

4

5

6

1

10

100

Frequency/MHz

group1：Distance between the two electrodes6.4ｍｍ（RL-3264）

group2：Distance between the two electrodes3.2ｍｍ（RL1632）

group3：Distance between the two electrodes1.6 ∼ 2.0ｍｍ（RL3720W）

group4：Distance between the two electrodes1.25ｍｍ（KRL2012）

Short

side

terminal

type

Long

side

terminal

type

Voltage pulse is applied to the test samples mounted

on the test board.

After each pulse, resistance drift is measured. Pulse

vol tage is increased until the drift exceeds +/-0.5%.

The power at that voltage is defined as the maximum

pulse power.

Test procedure

Pulse duration（seconds）

200

150

50

100

0

0.001

0.01

0.1

1

10

RL7520W-R10

RL3264-R050

RL7520-R10

RL1632-R050

RL1220-R10

100

50

0

−55

0

70

125

RL3720W

100

50

0

−55

0

30

150

125

RL7520W

◆Resistance to power pulse

◆ESL (Equivalent series inductance)

◆Surface temperature data

○

◆Derating Curve

The high power type land pattern and

surface temperature

60