LTR1 2
&
LTM1 2
・
・
Ultra-Miniature Illuminated
Pushbutton Switches
RoHS Compliant
■Series
Conductive Rubber Contact（LTR type）
Mettal Contact（LTM type）
■:WLJPÄJH[PVUZ
Rating
Initial Contact
Resistance
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.
LTR：500
Ω
max.（1mA 2VDC at 1.47N
½150gf½
）
LTM：100m
Ω
max
（1.5mA
200μ VAC at 1.96N
½200gf½
）
■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).
Dielectric Strength 250VAC 1 minute
Insulation Resistance
100MΩ min
（100VDC）
Electrical Life
Contact Bounce
Travel
Operating Force
（at peak force）
Operating
Storage
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.
LTR
：100,000
operations
LTM：300,000
operations
LTR
：3
msec. max.
（Initial
value）
LTM：10
msec. max.
（Initial
value）
LTR
：1
mm
LTM：0.25
mm
LTR
：0.98±0.39N
LTM：1.37±0.39N
−25∼＋70℃
−40∼＋70℃
Temperature Range
Temperature Range
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.
LTR・LTM
■Part
Numbering
■Operating
Force vs. Stroke Characteristics
LT M G
Series Code
Contact Plating
Type of Contact
2
̶
01
̶
L2
LED luminance
LED Color
Structure
■Type
of Contacts and Contact Plating
Code
R
M
MG
Type of Contact
Conductive rubber contact
Metal contact
Metal contact
Contact Plating
Gold plated
Fig.A
Silver plated
Gold plated
■PC
Hole Layouts
Type
LTR1/LTM1
LTR2/LTM2
Note : The contacts of
LTR
series are all gold-plated.
■Structure
Fig.
1
2
Dimensions
（Top
view）
Structure
Without LED
（Non-illuminated）
With LED
■LED
liminance
Symbol
01
LED luminance
（Normal
luminance )
（High
luminance )
■3,+
:WLJPÄJH[PVUZ
LTR2・LTM2・LTMG2
Code
L2
L5
L6
L8
L2
L5
L8
Color
Red
Green
Bule
Yellow
Red
Green
Yellow
High
Normal
Forward
Luminance
Current (I
F
)
30mA
25mA
30mA
30mA
30mA
30mA
30mA
Forward V (V
F
)
nom.
2.0V
2.2V
3.8V
2.1V
1.95V
3.2V
2.0V
max.
2.5V
2.5V
4.5V
2.5V
2.5V
4.0V
2.5V
Reverse
Voltage (V
R
)
DC5V
DC5V
DC5V
DC5V
DC5V
DC5V
DC5V
31
■7HJRHNPUN
:WLJPÄJH[PVUZ
Zipper Plastic Bag
■Table
of Part Numbers
Series
Contact plating
Non-illuminated
LTM1−01
LTM2−01−L2
LTM2−01−L5
★LTM2−01−L6
LTM2−01−L8
Silver Plated
−
LTM2−31−L2
LTM2−31−L5
−
LTM2−31−L8
LTM
Gold Plated
LTMG1−01
LTR1−01
LTR
Gold Plated
−
LTR2−31−L2
LTR2−31−L5
−
LTR2−31−L8
Red
LED color
★LTMG2−01−L2
LTR2−01−L2
★LTMG2−01−L5
LTR2−01−L5
Green
Bule
Yellow
▲
LTMG2−01−L6
★LTR2−01−L6
★LTMG2−01−L8
LTR2−01−L8
▲
：
Inquiry products.
★：
Made to order products.
LTR Conductive Rubber Contact）
（
LTR1
SPST
Without LED
（Non-illuminated）
□6
STROKE 1）
（
2.5
6.5±0.3
0.4
Switching function
Circuit diagrams
Part No.
3.5±0.3
0.5
5.08±0.5
6.2
（4）
0.65
FUJI SOKU
（2）
LTR1-01
Connecting terminals
OFF
̶
（ON）
7
6±0.2
（3）
t=0.3
（1）
Terminal numbers are not shown on the switch.
LTR2
SPST
With LED
□6
0.7
2.5
STROKE 1）
（
6.5±0.3
0.4
7±3
3.5±0.3
0.5
5.08±0.5
6.2
（4）
Switching function
Circuit diagrams
Part No.
0.65
（6）
FUJI SOKU
（2）
7
6±0.2
LTR2−01−L■
LTR2−31−L■
Connecting
terminals
LED circuit
OFF
̶
（ON）
（3）
t=0.3
0.5
（1）
（5）
Terminal numbers are not shown on the switch.
LTM
（Metal
Contact）
LTM1
SPST
Without LED
（Non-illuminated）
Switching function
□6
STROKE 0.25）
（
2.5
6.5±0.3
0.4
3.5±0.3
0.5
5.08±0.5
6.2
（4）
0.65
FUJISOKU
（2）
Circuit diagrams
Part No.
7
6±0.2
LTM1−01
LTMG1−01
Connecting terminals
OFF
̶
（ON）
（3）
t=0.3
（1）
Terminal numbers are not shown on the switch.
LTM2
SPST
With LED
□6
0.7
2.5
STROKE 0.25）
（
6.5±0.3
0.4
7±3
3.5±0.3
0.5
5.08±0.5
6.2
（4）
0.65
（6）
（2）
Switching function
Circuit diagrams
Part No.
LTM2−01−L■
LTMG2−01−L■
LTM2−31−L■
Connecting
terminals
LED circuit
FUJISOKU
7
6±0.2
OFF
（ON）
（3）
0.5
t=0.3
（1）
（5）
̶
Terminal numbers are not shown on the switch.
（ON）
：Momentary
3,+ JVSVY [V IL ZWLJPÄLK PU
■.
■ ：Refer
to "Table of Part Numbers" on P.171.
LTR・LTM
■Soldering
Series
Manual soldering
Auto soldering
■Flux
Cleaning
LTM
380℃ Max.
3sec. Max.
275℃ Max.
6sec. Max.
LTR
380℃ Max.
3sec. Max.
265℃ Max.
6sec. Max.
⑴Solvents
: Fluorine or Alcohl type
⑵LTM
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.
7YLOLH[PUN PU [OL ÅV^ SPUL ZOV\SK IL e℃ , 120 sec. max.
Do not dip solder the switches with
color buttons
or
mounting frames
attached. Soldering heat may deform
[OL HJJLZZVYPLZ VY JH\ZL PUNYLZZ VM Å\_
■
Dimensions of Assembled Switch
Button
□10用
10mm sq.
φ10用
10mm dia.
□7.5用
7.5mm sq.
φ7.5用
7.5mm dia.
size
A
size
B
■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
HTTVUPH NHZ ^OPJO TH` H LJ[ [OL ZPS]LY WSH[PUN
⑵LTM
and
LTR
series are open-structure switches and should not
be used in a dusty environment.
1.5
2
7.5 3.5
（12.5）
Ｂ
Ａ
□10
□12.5
10mm sq. 12.5mm sq.
φ10
φ12.5
10mm dia. 12.5mm dia.
□7.5
□10
7.5mm sq. 10mm sq.
φ7.5
φ10
7.5mm dia. 10mm dia.
■Precautions
LED circuit
Current to be applied to the
LED must be lower than the
forward current (IF) indicated
in the LED Specifications
of each switches. Resistance
value R should be calculated
using the formula on the right.
Example :
E=5V,
I
F
=10mA
R=
E−V
F
I
F
R=
5−2.0
0.01
=300Ω
Use
V
F
=2.0V to calculate.
Accessories
mounting
ling the Mounting Frame
all the mounting frame
hat the tab on the frame
n the same direction as
slot on the switch.
Installing the Button
Install the button so that the protrusions on the switch fit into
the square holes on the button.
The mounting frame cannot be installed with the switch
button installed.
LTR LTM
・
■Optional
Accessories
Part Name
Color Button
《Sold
separately》
Dimensions
（ABS）
Non-illuminated type
Dark gray
Gray
Light gray
Ivory
Red
Green
Blue
Clear
Red clear
Green clear
Yellow clear
Clear
Red clear
Green clear
Yellow clear
Part Name
140007480168
140007480169
140007480170
140007480171
140007480172
140007480174
140007480173
140007480422
140007480205
140007480206
140007480207
140007480554
140007480551
140007480552
140007480553
140007480178
140007480179
140007480180
140007480181
140007480182
140007480184
140007480183
140007480451
140007480208
140007480209
140007480210
140007480558
140007480555
140007480556
140007480557
140007480188
140007480189
140007480190
140007480191
140007480192
140007480194
140007480193
140007480505
140007480211
140007480212
140007480213
140007480562
140007480559
140007480560
140007480561
140007480198
140007480199
140007480200
140007480201
140007480202
140007480204
140007480203
140007480506
140007480214
140007480215
140007480216
140007480566
140007480563
140007480564
140007480565
Illuminated type
High luminance
Normal luminance
Mounting Frame
Dimensions
（ABS）
Dark gray
Gray
Light gray
Ivory
140000340170
140000340179
140000340180
140000340181
140000340171
140000340182
140000340183
140000340184
140000340168
140000340173
140000340174
140000340175
140000340169
140000340176
140000340177
140000340178
Mounting frame is common to both illuminated
and non-illuminated switches.
Part Name
Dimensions
（ABS）
Color Button
LED luminance
②Screen color
①Color
Normal luminance
Clear
140007480452
140007480453
140007480454
140007480455
140007480456
140007480457
140007480458
High luminance
Normal luminance
Clear
High luminance
Illuminated type
Dark gray
Gray
Light gray
Ivory
Red
Green
Blue
140007480567
140007480568
140007480569
140007480570
140007480571
140007480572
140007480573
140007480459
140007480460
140007480461
140007480462
140007480463
140007480464
140007480465
140007480574
140007480575
140007480576
140007480577
140007480578
140007480579
140007480580
：Optional
Accessories
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