260

Illuminated Tactile Switches

B3W-9

LED Specifications

Note: For Switches with two LEDs, red and green, the recommended operating current is 12 mA for the red and 20 mA for the green LED for ap-

plication with three-color illumination.

LEDs

■ Ambient Temperature vs Maximum Forward Current

Note: 1. Pay attention to the polarity of each LED. The anode and cathode can be identified by finding the cathode mark, as indicated on the Dimensions page.

2. Connect limiting resistors to the LEDs. The Switch does not have built-in limiting resistors, so satisfy the LED characteristics by obtaining the limiting

resistance according to the following formula based on the voltage to be used.

LED color

Red

Green

Green (high brightness)

Yellow

Blue

Maximum Forward current I

FM

27 mA

27 mA

27 mA

45 mA

27 mA

Recommended operating current I

F

20 mA

20 mA

10 mA

20 mA

10 mA

Forward voltage (typical value) V

F

1.8 V

2.1 V

3.7 V

2.4 V

3.7 V

Maximum reverse voltage V

R

5 V

5 V

5 V

5 V

5 V

Ambient operating temperature

-25

°C to 70°C

0

40

20

20

10

30

40

50

60

80

0

Ambient temperature Ta (

°C)

Yellow

High brightness

Green and Blue

Red, Green

0.2

0.5

5.0

50.0

100.0

0

1.5

0.1

2.0

20.0

200.0

0

1

2.5

3.5

1.0

10.0

300.0

00.5

2

3

Red

0

100

90

80

70

60

50

40

30

20

10

0

0.5

1

1.5

2

2.5

3

3.5

Green

0

2.0

1.5

40

20

60

80

100

2.5

3.0

1.0

Yellow

Green (High brightness), Blue

0

30

25

20

15

10

5

35

0

1234

5

Limiting resistance (R)=

(Voltage used (E) – LED forward voltage (VF))

LED forward current (IF)

(

Ω)

E

R