LTR1・2
&
LTM1・2
Ultra-Miniature Illuminated
Pushbutton Switches
RoHS Compliant
■Series
Conductive Rubber Contact（LTR type）
Mettal Contact（LTM type）
■Features
1. Full Surface Illumination (LTM2, LTMG2, LTR2 Series
Miniature, low-cost switch with full surface illumination by
LED. Buttons available in square shape (7.5/10mm sq.)
and round shape (7.5/10mm dia.) in 3 colors (Red, Green,
Yellow). Non-illuminated switches also available (LTM1,
LTMG1, LTR1 series).
2. Two Types of Contacts
LTR series: Conductive rubber contact for soft tactile feel.
LTM/LTMG series: Metal contact for sharp tactile feel.
3. PC Board Mount
Terminal pitch is in inches (multiples of 2.54 mm) for all
models. The unique terminal shape prevents the terminals
from coming loose from the PC board during dip soldering.
4. Enhanced Resistance to Soldering Heat
Improved terminal structure protects the contacts from
soldering heat. In addition, each pole has two terminals
which can be used as a jumper wire.
5. Compatible With Lead-Free Soldering (LTM Series)
Heat-resistance resin for lead-free soldering.
■
Rating
LTR ：10mA 12VDC max. 10μ A Min.
LTM：
1VA max. （50mA max.48VDC max）
0.5mA min.
LTMG：
1VA Max.（50mA max.48VDC max.）
10 μ A min.
Initial Contact
Resistance
LTR：
500 Ω max.（
1mA 2VDC at 1.47N ｛150gf｝）
LTM
：
100m Ω max
（1.5mA 200μ VAC at 1.96N ｛200gf｝）
Dielectric Strength
250VAC 1 minute
InsulationResistance
100MΩ min          （100VDC）
ElectricalLife LTR ：100,000 operations
LTM：300,000 operations
ContactBounce
LTR ：3 msec. max. （Initial value）
LTM：10 msec. max. （Initial value）
Travel
LTR ：1 mm
LTM：0.25 mm
OperatingForce
（atpeakforce）
LTR ：0.98±0.39N
LTM：1.37±0.39N
Operating
TemperatureRange
−25〜＋70℃
Storage
TemperatureRange
−40〜＋70℃
LTR・LTM
■Part Numbering
LT M G 2
01
L2
■Type of Contacts and Contact Plating
Code Type of Contact
Contact Plating
RConductive rubber contact Gold plated
MMetal contact Silver plated
MG Metal contact Gold plated
Note : The contacts of LTR series are all gold-plated.
■Structure
Fig. 12
Structure
Without LED
（Non-illuminated）With LED
■Table of Part Numbers
Series LTM LTR
Contactplating Silver Plated Gold Plated Gold Plated
Non-illuminated  LTM1−01 − LTMG1−01  LTR1−01 −
LEDcolor
Red  LTM2−01−L2  LTM2−31−L2 ★LTMG2−01−L2  LTR2−01−L2  LTR2−31−L2
Green  LTM2−01−L5  LTM2−31−L5 ★LTMG2−01−L5  LTR2−01−L5  LTR2−31−L5
Bule ★LTM2−01−L6 −
▲
LTMG2−01−L6 ★LTR2−01−L6 −
Yellow  LTM2−01−L8  LTM2−31−L8 ★LTMG2−01−L8  LTR2−01−L8  LTR2−31−L8
■PC Hole Layouts
Type LTR1/LTM1 LTR2/LTM2
Dimensions
（Top view）
■
Operating Force vs. Stroke Characteristics
■
 LTR2・LTM2・LTMG2
■LLED liminance
Symbol LED luminance
01 Normal luminance
31 High luminance
■
Zipper Plastic Bag
Series Code
Type of Contact
Contact Plating
LED luminance
Structure LED Color
A図/Fig.A
Code Color
Luminance
Forward
Current (I
F
)
Forward V (V
F
)
Reverse
Voltage (V
R
)
nom. max.
L2 Red
Normal
30mA 2.0V 2.5V DC5V
L5 Green 25mA 2.2V 2.5V DC5V
L6 Bule 30mA 3.8V 4.5V DC5V
L8 Yellow 30mA 2.1V 2.5V DC5V
L2 Red
High
30mA 1.95V 2.5V DC5V
L5 Green 30mA 3.2V 4.0V DC5V
L8 Yellow 30mA 2.0V 2.5V DC5V
▲
： Inquiry products. ★： Made to order products.
Part No.
Switching function
Circuit diagrams
LTR2−01−L■
LTR2−31−L■
OFF （ON）
Connecting
terminals
LED circuit
Part No.
Switching function
Circuit diagrams
LTM2−01−L■
LTMG2−01−L■
LTM2−31−L■
OFF （ON）
Connecting
terminals
LED circuit
（ON）：Momentary ■. ■ ：Refer to "Table of Part Numbers" on P.171.
LTR（Conductive Rubber Contact）
LTM（Metal Contact）
Part No.
Switching function
Circuit diagrams
LTR1
-
01 OFF （ON）
Connecting terminals
Part No.
Switching function
Circuit diagrams
LTM1−01
LTMG1−01
OFF （ON）
Connecting terminals
LTR1
LTM1
LTM2
LTR2
Terminal numbers are not shown on the switch.
Terminal numbers are not shown on the switch.
Terminal numbers are not shown on the switch.
Terminal numbers are not shown on the switch.
SPST
Without LED （Non-illuminated）
SPST
Without LED （Non-illuminated）
SPST
With LED
SPST
With LED
0.5
（4）
（3）
（2）
（1）
6±0.2
5.08±0.5
3.5±0.3
6.5±0.3
□6
FUJI SOKU
6.2
7
t=0.3
0.4
2.5
STROKE（1）
0.65
0.5
6±0.2
5.08±0.5
3.5±0.3
7±3
6.5±0.3
0.5
0.7
□6
6.2
7
t=0.3
0.4
2.5
FUJI SOKU
STROKE（1）
0.65
（5）
（4）
（3）
（2）
（1）
（6）
0.5
FUJISOKU
（4）
（3）
（2）
（1）
6±0.2
5.08±0.5
3.5±0.3
6.5±0.3
□6
6.2
7
t=0.3
0.4
2.5
STROKE（0.25）
0.65
0.5
0.7
7±3
0.5
6±0.2
5.08±0.5
3.5±0.3
6.5±0.3
□6
6.2
7
t=0.3
0.4
2.5
STROKE（0.25）
FUJISOKU
0.65
（6）
（5）
（4）
（3）
（2）
（1）
Ｂ
Ａ
2
7.5 3.5 1.5
（12.5）
LTR・LTM
■Soldering
Series LTM LTR
Manualsoldering
380℃ Max.
3sec. Max.
380℃ Max.
3sec. Max.
Autosoldering 275℃ Max.
6sec. Max.
265℃ Max.
6sec. Max.
・
℃, 120 sec. max.
●Do not dip solder the switches with color buttons or
mounting frames attached. Soldering heat may deform
!#
■Dimensions of Assembled Switch
■Flux Cleaning
⑴Solvents : Fluorine or Alcohl type
⑵
LTM and LTR series are not washable. To wash the PC board,
clean the soldering surface of the PC board with a brush so
that the switch is not exposed to the cleaning solution.
⑶After soldering, wait until the temperature of the terminals
cool down to 90℃ or below or until the parts are exposed
to room temperature for more than 5 min. before washing.
■Ambient Conditions
⑴In case of switches with silver-plated contacts, do not use in
an environment where there is corrosive gas such as sulfuric or
$$$%&'#
⑵LTM and LTR series are open-structure switches and should not
be used in a dusty environment.
■Precautions
LED circuit
Accessories
mounting
Use
V
F
=
2
.
0
Vtocalculate.
I
F
=
1
0
mA
E
xam
pl
e:
E
,
C
urrent to be applied to the
L
ED must be lower than the
forwardcurrent
(
IF
)
indicated
intheLEDSpecification
s
o
f
eachswitches.Resistance
v
a
l
ue
R
s
h
ou
l
d
be
ca
l
cu
l
ated
usin
g
theformulaontheri
g
ht.
li
ngt
h
e
M
ount
i
ng
F
ram
e
a
ll the mounting frame
h
atthetabontheframe
n
thesame direction as
s
l
ot
o
n
t
h
e
s
wi
tc
h
.
Installin
g
theButton
I
nstallthebuttonsothatthe
p
rotrusionsontheswitchfitinto
t
hesquareholesonthebutton
.
The mounting
f
rame cannot be installed with the switch
butto
nin
sta
ll
ed
.
R=
R=
=
300
Ω
E
−
V
F
5
−2.
0
0
.
01
I
F
Button size Asize B
□10
10mm sq.
□10
10mm sq.
□12.5
12.5mm sq.
φ10
10mm dia.
φ10
10mm dia.
φ12.5
12.5mm dia.
□7.5
7.5mm sq.
□7.5
7.5mm sq.
□10
10mm sq.
φ7.5
7.5mm dia.
φ7.5
7.5mm dia.
φ10
10mm dia.
LTR・LTM
■Optional Accessories
《Sold separately》
PartName Color Button
Dimensions
Non-illuminatedtype
Darkgray 140007480168 140007480178 140007480188 140007480198
Gray 140007480169 140007480179 140007480189 140007480199
Lightgray 140007480170 140007480180 140007480190 140007480200
Ivory 140007480171 140007480181 140007480191 140007480201
Red 140007480172 140007480182 140007480192 140007480202
Green 140007480174 140007480184 140007480194 140007480204
Blue 140007480173 140007480183 140007480193 140007480203
Illuminatedtype
Normalluminance
Clear 140007480422 140007480451 140007480505 140007480506
Redclear 140007480205 140007480208 140007480211 140007480214
Greenclear
140007480206 140007480209 140007480212 140007480215
Yellowclear
140007480207 140007480210 140007480213 140007480216
Highluminance
Clear 140007480554 140007480558 140007480562 140007480566
Redclear 140007480551 140007480555 140007480559 140007480563
Greenclear
140007480552 140007480556 140007480560 140007480564
Yellowclear
140007480553 140007480557 140007480561 140007480565
PartName 取付枠/Mounting Frame
Dimensions
Darkgray 140000340170 140000340171 140000340168 140000340169
Gray 140000340179 140000340182 140000340173 140000340176
Lightgray 140000340180 140000340183 140000340174 140000340177
Ivory 140000340181 140000340184 140000340175 140000340178
Mounting frame is common to both illuminated
and non-illuminated switches.
PartName Color Button
Dimensions
Illuminatedtype
LEDluminance Normal luminance High luminance Normal luminance High luminance
②
Screencolor
①Color Clear Clear
Darkgray 140007480452 140007480567 140007480459 140007480574
Gray 140007480453 140007480568 140007480460 140007480575
Lightgray 140007480454 140007480569 140007480461 140007480576
Ivory 140007480455 140007480570 140007480462 140007480577
Red 140007480456 140007480571 140007480463 140007480578
Green 140007480457 140007480572 140007480464 140007480579
Blue 140007480458 140007480573 140007480465 140007480580
□1
0
□
10
□
12
.5
：Optional Accessories