9-68
Series
Package Dimensions
A. LTP-2057A/2157A
Features
2.0 inch (50.80mm) matrix height.
Low power requirement.
Single plane, wide viewing angle.
Solid state reliability.
57 array with X-Y select
Compatible with usascll and ebcdic codes.
Stackable horizontally.
Choices of two matrix orientation
Cathode row or cathode column.
Easy mounting on P.C. board.
Categorized for luminous intensity.
Single color displays have the choices of four bright
colors-green/yellow/red orange/AlGaAs red.
Multicolor displays are applicable to three bright colors
: green, red orange and yellow (green and red orange
mixed)
Description
The LTP-2X57A series are 2.0 inch (50.80mm)matrix
height 5 7 dot matrix displays.
The LTP-2657AA/2757AA are multicolor applicable
displays. The multicolor displays have gray face and
white dots.
The LTP-2057/2157A series are single color displays.
The green, yellow, red orange and AlGaAs red displays
have gray face and white dots.
The green series devices utilize LED chips which are
made from GaP on a transparent GaP substrate.
The yellow and red orange series devices utilize LED
chips which are made from GaAsP on a transparent GaP
substrate.
The AlGaAs red series devices utilize LED chips which
are made from AIGaAs on a non-transparent GaAs
substrate.
Notes : All dimensions are in millimeters(inches).
Tolerance : 0.25mm (0.01") unless other-
wise noted.
Devices
5 5 7 Single Color & Multicolor
Dot Matrix LED Displays
LTP-2057A/2157A
2657AA/2757AA
B. LTP-2657AA/2757AA
Part No. LTP- Package
Dimension
Red
Orange
Anode Column, Cathode Row
Cathode Column, Anode Row
Anode Column, Cathode Row
Cathode Column, Anode Row
2057AE
2157AE
Multi
Color
2657AA
2757AA
Green
2057AG
2157AG
Internal
Circuit
Diagram
Description
A
B
C
D
A
A
B
B
AlGaAs
Red
2057AC
2157AC
Yellow
2057AY
2157AY
9-69
DISPLAYS
Pin Connection
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A. LTP-2057A
Cathode Row 5
Cathode Row 7
Anode Column 2
Anode Column 3*1
Cathode Row 4*2
Anode Column 5
Cathode Row 6
Cathode Row 3
Cathode Row 1
Anode Column 4
Anode Column 3*1
Cathode Row 4*2
Anode Column 1
Cathode Row 2
Notes : 1. Pin 4 & 11 are internally connected.
2. Pin 5 & 12 are internally connected.
Connection
B. LTP-2157A
Anode Row 5
Anode Row 7
Cathode Column 2
Cathode Column 3*1
Anode Row 4*2
Cathode Column 5
Anode Row 6
Anode Row 3
Anode Row 1
Cathode Column 4
Cathode Column 3*1
Anode Row 4*2
Cathode Column 1
Anode Row 2
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
C. LTP-2657AA
Anode Column 1 Green
Anode Column 1 Red Orange
Cathode Row 7 Green
Cathode Row 7 Red Orange
Anode Column 2 Green
Anode Column 2 Red Orange
Anode Column 3 Green
Anode Column 3 Red Orange
Cathode Row 5 Green
Cathode Row 5 Red Orange
Cathode Row 4 Green
Cathode Row 4 Red Orange
Cathode Row 6 Green
Cathode Row 6 Red Orange
Anode Column 5 Green
Anode Column 5 Red Orange
Cathode Row 1 Green
Cathode Row 1 Red Orange
Anode Column 4 Green
Anode Column 4 Red Orange
Anode Column 3 Green
Anode Column 3 Red Orange
Cathode Row 3 Green
Cathode Row 3 Red Orange
Cathode Row 4 Green
Cathode Row 4 Red Orange
Cathode Row 2 Green
Cathode Row 2 Red Orange
Connection
D. LTP-2757AA
Cathode Column 1 Green
Cathode Column 1 Red Orange
Anode Row 7 Green
Anode Row 7 Red Orange
Cathode Column 2 Green
Cathode Column 2 Red Orange
Cathode Column 3 Green
Cathode Column 3 Red Orange
Anode Row 5 Green
Anode Row 5 Red Orange
Anode Row 4 Green
Anode Row 4 Red Orange
Anode Row 6 Green
Anode Row 6 Red Orange
Cathode Column 5 Green
Cathode Column 5 Red Orange
Anode Row 1 Green
Anode Row 1 Red Orange
Cathode Column 4 Green
Cathode Column 4 Red Orange
Cathode Column 3 Green
Cathode Column 3 Red Orange
Anode Row 3 Green
Anode Row 3 Red Orange
Anode Row 4 Green
Anode Row 4 Red Orange
Anode Row 2 Green
Anode Row 2 Red Orange
9-70
Internal Circuit Diagrams
A. LTP-2057A B. LTP-2157A
C. LTP-2657AA D. LTP-2757AA
Notes : The Sign " " stands for Green color chips.
The Sign " " stands for Red Orange color chips.
Absolute Maximum Ratings at Ta=25
Parameter
Average Power Dissipation Per Dot
Peak Forward Current Per Dot
Average Forward Current Per Dot
Derating Linear from 25 Per Dot
Reverse Voltage Per Dot
Operating Temperature Range
Storage Temperature Range
Solder Temperature 1/16 Inch Below Seating Plane for 3 Seconds at 260
-35 to +85
-35 to +85
Green Red
Orange AlGaAs Red
36
100
13
0.17
5
36
100
13
0.17
5
36
125
15
0.20
5
Unit
mW
mA
mA
mA/
V
Yellow
32
80
10
0.12
5
9-71
DISPLAYS
Parameter
Average Luminous Intensity
Peak Emission Wavelength
Spectral Line Half-Width
Dominant Wavelength
Forward Voltage, any Dot
Reverse Current, any Dot
Luminous Intensity Matching Ratio
Symbol
IV
P
d
VF
IR
IV-m
Min.
1780
Typ.
4000
565
30
569
2.1
3.0
Max.
2.6
3.7
100
2:1
Unit Test Condition
IP=80mA
1/16 Duty
IF=20mA
IF=20mA
IF=20mA
IF=20mA
IF=80mA
VR=5V
IF=10mA
cd
nm
nm
nm
V
V
A
Parameter
Average Luminous Intensity
Peak Emission Wavelength
Spectral Line Half-Width
Dominant Wavelength
Forward Voltage, any Dot
Reverse Current, any Dot
Luminous Intensity Matching Ratio
Symbol
IV
P
d
VF
IR
IV-m
Min.
1780
Typ.
4800
630
40
621
2.0
2.6
Max.
2.6
3.4
100
2:1
Unit Test Condition
IP=80mA
1/16 Duty
IF=20mA
IF=20mA
IF=20mA
IF=20mA
IF=80mA
VR=5V
IF=10mA
cd
nm
nm
nm
V
V
A
Electrical/Optical Characteristics at Ta=25
LTP-2057AG/2157AG & LTP-2657AA/2757AA(Green)
LTP-2057AE/2157AE & LTP-2657AA/2757AA(Red Orange)
LTP-2057AC/2157AC
Test Condition
IP=80mA
1/16 Duty
IF=20mA
IF=20mA
IF=20mA
IF=20mA
IF=80mA
VR=5V
IF=10mA
Parameter
Average Luminous Intensity
Peak Emission Wavelength
Spectral Line Half-Width
Dominant Wavelength
Forward Voltage, any Dot
Reverse Current, any Dot
Luminous Intensity Matching Ratio
Symbol
IV
P
d
VF
IR
IV-m
Min.
6300
Typ.
12000
660
35
638
1.8
2.0
Max.
2.4
2.7
100
2:1
Unit
cd
nm
nm
nm
V
V
A
Note: Luminous intensity is measured with a light sensor and filter combination that approximates the CIE
(Commision Internationale De L’Eclairage) eye-response curve.
Parameter
Average Luminous Intensity
Peak Emission Wavelength
Spectral Line Half-Width
Dominant Wavelength
Forward Voltage, any Dot
Reverse Current, any Dot
Luminous Intensity Matching Ratio
Symbol
IV
P
d
VF
IR
IV-m
Min.
1780
Typ.
4800
585
35
588
2.1
3.0
Max.
2.6
3.7
100
2:1
Unit Test Condition
IP=80mA
1/16 Duty
IF=20mA
IF=20mA
IF=20mA
IF=20mA
IF=80mA
VR=5V
IF=10mA
cd
nm
nm
nm
V
V
A
LTP-2057AY/2157AY
9-72
Typical Electrical/Optical Characteristic Curves
(25 Ambient Temperatrue Unless Otherwise Noted)
