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LED displays
LM-1256 Series
16×16 matrix displays
LM-1256 Series
The LM-1256 series are 16 × 16 matrix
displays which can be used in a wide
variety of applications, includi ng alphabet, numeric, symbol, and red are available .
zApplications
Light sources for displays
zFeatures
1) 16×16 dot matrix
Circlar emitters.
2) External dimensions : 32×32×5.4mm
3) Emitters : Circular, 1.6mm diameter.
4) Black package.
zSelection guide
Emitting color
Common
Anode
∗
Bright red
∗
Red
LM-1256LB1
zPin assignments (Top view)
Pin No.24Pin No.25
ABCDE FGH I JK LMNOP
1
2
3
in No.32
Pin No.1
4
5
6
7
8
9
10
11
12
13
14
15
16
Single color type
Pin No.9Pin No.8
Pin No.1
Pin No.1
Rev.C 1/3
zDimensions ( Unit : mm )
A BCDEFGHIJKLMNOP
1
2
3
4
5
6
7
0
-0.1
8
32
9
10
P2×15=30
11
12
13
14
15
16
256-φ1.6
Single color type
1Pin Mark
Part No.
LM-1256LB1
rank
PIN 32 PIN 16
P2×7=14
PIN 25
Tolerances ±0.3 unless otherwise noted
P2×15=30
φ0.5
PIN 8PIN 1
R2
PIN 24
0
32
-0.1
88
505K
P2×7=14
24
4-φ1PIN
PIN 9
PIN 17
3.7
1.7
6±0.5
8
24
8
Lot No.

LED displays
zInternal circuit schematic
1 2 3 4 15 16
P
O
B
A
LM-1256 Series
Single color type
(LB1)
zPin assignment table
Single-color type(LB1)
Pin No. Connection ConnectionPin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A Cathode
B Cathode
C Cathode
D Cathode
E Cathode
F Cathode
G Cathode
H Cathode
16 Anode
15 Anode
14 Anode
13 Anode
12 Anode
11 Anode
10 Anode
9 Anode
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
P Cathode
O Cathode
N Cathode
M Cathode
L Cathode
K Cathode
J Cathode
I Cathode
1 Anode
2 Anode
3 Anode
4 Anode
5 Anode
6 Anode
7 Anode
8 Anode
zAbsolute maximum ratings (Ta=25°C)
Single-color type
Parameter Symbol
Power dissipation
Forward current
Peak forward current
Reverse voltage
Operating temperature
Storage temperature
∗
1
Pulse width 1msec duty 1 / 16
Bright red
∗
2
P
I
F
I
FP
V
Topr
Tstg
D
R
LB1
2
Red∗
50
20
1
∗
60
4
−20 to +50
−30 to +75
Unit
mW/do
mA/do
mA/do
V
°C
°C
Rev.C 2/3

LED displays
zElectrical and optical characteristics (Ta=25°C)
Single-color type
LB1
Parameter
Forward voltage
Reverse current
peak wavelength
Spectral halfpower bandwidth
Not designed for radiation resistance.
∗1
IF = 20mA
Symbol
V
λ
∆λ
F
I
R
P
Conditions
I
F
=
20mA
V
R
=
3V
F
=
20mA
I
I
F
=
20mA
Red∗1
Min. Typ. Max.
−
−−
660
−
25
−−
zLuminous intensity
2.51.75
100
−
Unit
V
µA
nm
nm
LM-1256 Series
Color
Red∗1
ote : ∗1Measured at IF = 20mA
Type
LB1
Min.
22
Typ.
56
Max.
−
Unit
mcd
Rev.C 3/3

Appendix
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
Notes
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1