4

Components

100

50

0

−55

0

30

150

125

Ambient temperature ℃

RL7520W

Power derating characteristics

ESL

Power derating curve

100

50

0

Ambient temperature ℃

−55

0

70

125

surface temperature

0

0

20

40

60

80

100

120

160

180

200

220

5

10

15

20

25

RL3720W（Power rating1Ｗ）

W（mm）

1W applied

0.75W applied

0.5W applied

W

Chip resistors

Land area（S）＝Ｗ・Ｌ

L

(27mm)

Land pattern

0

0

20

40

60

80

100

120

160

180

200

220

5

10

15

20

25

RL7520W（Power rating2Ｗ）

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 rating0.5Ｗ）

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 rating1Ｗ）

L（mm）

1W applied

0.75W applied

0.5W applied

0.25W applied

W

（7.9mm）

Chip resistors

L

Land pattern

Resistance to power pulse

200

150

50

100

0

0.001

0.01

0.1

1

10

Pulse duration（seconds）

RL7520W-R10

RL3264-R050

RL7520-R10

RL3720-R075

RL1632-R050

RL1220-R10

Test procedure

Voltage pulse is applied to the test

samples mounted on the test board.

After each pulse, resistance drift

is measured. Pulse voltage is

increased until the drift exceeds

+/-0.5%. The power at that voltage

is defined as the maximum pulse

power.

Surface temperature data

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

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.

RL3720W（Power rating1W）

RL7520W（Power rating2W）

RL3720W（Power rating0.5W）

RL7520W（Power rating1W）

※Low ESL controls the noise.

Part numbering system

PRL

T R10

Packaging：T5（5000pcs）

Resistance tolerance

Resistance value

Temperature coefficient of resistance

Size

Series code

1220

F

-

-

RL

T R10

3720W

F

-

-

-