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c 2011 ROHM Co., Ltd. All rights reserved. 2011.04 - Rev.C
High efficiency, three-digit numeric displays
LB-303AK Series
The LB-303AK series were designed t o meet the need for multi-di git numeric dis pla ys. These LED numeric dis plays u se GaAsP
on GaP for the emitting material (with the exception of green) and are housed in an epoxy resin package. They are three-digit
displays with a character height of 8.0 mm.
Features Dimensions (Unit : mm)
1) Height of character : 8.0 mm
2) High efficiency in a compact package.
3) Common anode and common cathode
configurations are available for red and green.
4) The package surface is painted black and
the segments are colored the display color.
Selection guide
Red Green
LB-303VA
LB-303VK
LB-303MA
LB-303MK
Anode
Cathode
Common
Emitting color
Pin assignments
Digit 1
D.P1
a
g
d
fb
ec
Digit 2
D.P2
a
g
d
fb
ec
Digit 3
D.P3
a
g
d
fb
ec
Pin No.
++++++
+++++
123456
11 10 9 8 7
Segment "c"
Digit 1 Common
Segment "d"
Digit 2 Common
Digit 3 Common
Segment D.P
Segment "b"
Segment "f"
Segment "a"
Segment "e"
Segment "g"
1
2
3
4
5
6
7
8
9
10
11
FunctionPin No.
1.0
4.0
φ 0.5
(9.2)
φ3- 0.9
(12.7)
(2.54)
φ 0.5
5.0±0.5 5.0 1.0
8.0
13.0
22.0
7.0 7.0
10°
Tolerances are ±0.3 unless otherwise noted:
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c 2011 ROHM Co., Ltd. All rights reserved. 2011.04 - Rev.C
Data Sheet LB-303AK Series
Internal circuit schematic (example of common anode)
a
9b
7c
1d
3e
10 f
8g
11 D.P
6
5 Dig.3
4 Dig.2
2 Dig.1
Absolute maximum ratings (Ta = 25C)
Parameter Symbol Red Unit
LB-303VA / VK
LB-303MA / MK
960
40
15
60∗
3
mW
mW
mA
mA
V
°C
°C
PD
PD / seg
IF
IFP
VR
Topr
Tstg
Power dissipation
Power dissipation
Forward current
Peak forward current
Reverse voltage
Operating temperature
Storage temperature
Green
1440
60
20
60∗
3
−25 to +75
−30 to +85
∗
Pulse width 1ms duty 1 / 5
Electrical and optical characteristics (Ta = 25C)
Parameter Symbol Red Green UnitConditions Min. Typ. Max.
V
μA
nm
nm
2.82.0
650
40
100
−
−
−
−
−−
−
Min. Typ. Max.
2.82.1
563
40
100
−
−−
−
−
−−
IF = 10mA
VR = 3V
IF = 10mA
IF = 10mA
VF
IR
λP
Δλ
Forward voltage
Reverse current
Peak wavelength
Spectral line half width
Not designed for radiation resistance.
Luminous intensity
Unit
Min. Typ. Max.
Color λ
P
Type
Red
Green
650
563
LB-303VA
LB-303VK
LB-303MA
LB-303MK
1.4 4.0 −mcd
2.2 6.3 −mcd
Note : Measured at I
F
= 10mA
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c 2011 ROHM Co., Ltd. All rights reserved. 2011.04 - Rev.C
Data Sheet LB-303AK Series
Electrical and optical characteristic curves
Fig.1 Forward Current - Forward Voltage
LB-303MA
LB-303MK
LB-303VA
LB-303VK
0.1
1
10
100
1 1.5 2 2.5 3
Ta=25°C
Forward Voltage:VF(V)
Forward Current:IF(mA)
Fig.2
Relative Luminous Intensity - Forward Current
0.01
0.10
1.00
10.00
1 10 100
Relative Luminous Intensity
Forward Current:I
F
(mA)
Ta=25°C
Fig.3
Relative Luminous Intensity - Case Temperature
0.4
0.6
1.2
1.4
1.6
Case Temparature (°C)
I
F
=10mA
-25 -15 -5 5 15 25 35 45 55 65 75
Relative Luminous Intensity
0.8
1
Fig.4
Ratio of Maximum Tolerable Peak Current - Pulse Duration
( Ι )
LB-303MA
LB-303MK
1 10 100 1000 10000 100000
Pulse Duration : tw(µs)
30Hz
100Hz
300Hz
1kHz
3kHz
10kHz
30kHz
100kHz
300kHz
Ratio of Maximum Tolerable peak
Current to Maximum Forward Current
( )
I
F
peak Max.
I
F
Max.
1
10
Fig.5
Ratio of Maximum Tolerable Peak Current - Pulse Duration
( ΙΙ )
1
10
1 10 100 1000 10000
Pulse Duration : tw(µs)
100Hz
200Hz
500Hz
1kHz
2kHz
5kHz
10kHz
20kHz
50kHz
Ratio of Maximum Tolerable peak
Current to Maximum Forward Current
( )
I
F
peak Max.
I
F
Max.
LB-303VA
LB-303VK
Fig.6 Derating
0%
20%
40%
60%
80%
100%
120%
Forward Current (%)
Ambient Temperature(°C)
-25 -15 -5 5 15 25 35 45 55 65 75 85
R1120A
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Notes
