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0886EMDD03VOL01E
For Right Use of Miniature Relays
DO NOT EXCEED MAXIMUM RATINGS.
Do not use relays under exceeding conditions such as over ambient temperature, over voltage and over
current. Incorrect use could result in abnormal heating, damage to related parts or cause burning.
READ CAUTIONS IN THE SELECTION GUIDE.
Read the cautions described in EM Devices' "Miniature Relays" when you choose relays for your
application.
The information in this document is subject to change without notice.
© EM Devices Corporation 2017
DATA SHEET
MINIATURE SIGNAL RELAY
EA2/EB2 SERIES
COMPACT SIZE, FLAT-PACKAGE
DESCRIPTION
NEXEM EA2/EB2 relay is a standard miniature signal relay, compact and flat.
FEATURES
 Compact and light weight
 FCC (1500 V) surge capacity.
 UL recognized and CSA certified.
 Low power consumption (100-200 mW)
APPLICATIONS
Electronic switching system, PBX, Terminal equipment, Telephone system
R
Ro
oH
HS
S
C
Co
om
mp
pl
li
ia
an
nt
t
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0886EMDD03VOL01E
EA2/EB2 SERIES
2
DIMENSIONS AND PAD LAYOUTS Unit: mm (inch)
EA2 SERIES
EB2 SERIES
14.2 max. (0.56) 9.2 max. (0.36)
2.54
2.54
7.62
5.4 (0.21)
max.
3.5
(0.14)
2.54
2.54
0.25
(0.01)
0.5
(0.02)
is basic size.
Other tolerances ±0.2mm
Lead size 0.5x0.25 ±0.1
NJ type: Cover height 6.3mm, Lead length 2.8mm
14.2 max. (0.56) 9.2 max. (0.36)
2.54
2.54
7.62
5.4 (0.21)
max.
3.5
(0.14)
2.54
2.54
0.25
(0.01)
0.5
(0.02)
is basic size.
Other tolerances ±0.2mm
Lead size 0.5x0.25 ±0.1
NJ type: Cover height 6.3mm, Lead length 2.8mm
2.54 10-Φ0.8
7.62
2.54 2.54 2.54
NOTE. General tolerance :±0.1
(Bottom view)
(mm)
2.54 10-Φ0.8
7.62
2.54 2.54 2.54
NOTE. General tolerance :±0.1
(Bottom view)
(mm)
14.3 max. (0.56) 9.3 max. (0.37)
11.5 (0.45)
7.5 (0.3)
max.
1.35
(0.05)
2.54
2.54
2.54
2.54
7.62
is basic size.
Other tolerances ±0.2mm Lead size 0.5x0.25 ±0.1
14.3 max. (0.56) 9.3 max. (0.37)
11.5 (0.45)
7.5 (0.3)
max.
1.35
(0.05)
2.54
2.54
2.54
2.54
7.62
is basic size.
Other tolerances ±0.2mm Lead size 0.5x0.25 ±0.1
2.54 2.54 2.54 2.54
9.56
1.0
2.94
NOTE. General tolerance :±0.1
(Bottom view)
(mm)
2.54 2.54 2.54 2.54
9.56
1.0
2.94
NOTE. General tolerance :±0.1
(Bottom view)
(mm)
(Top view)
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0886EMDD03VOL01E
EA2/EBE2 SERIES
3
PIN CONFIGURATIONS (Bottom view)
Non-latch type
Single coil latch type
Double coil latch type
MARKINGS (top view)
(1) Part number
(2) Manufacturer
(3) Country of origin
(4) Date code
(5) Direction mark (pin No. 1 and 10)
(6) UL,CSA marking
12345
10 9 8 7 6
Direction mark
Non-latch type
(Not energized position)
+
-
12345
10 9 8 7 6
Direction mark
Non-latch type
(Not energized position)
+
-
12345
10 9 8 7 6
Direction mark
Single coil latch type
(Reset position)
S: Coil polarity for Set
R: Coil polarity for Reset
-
R
+
+
S
-
12345
10 9 8 7 6
Direction mark
Single coil latch type
(Reset position)
S: Coil polarity for Set
R: Coil polarity for Reset
-
R
+
+
S
-
1 2 3 4 5
10 9 8 7 6
Set coil
Reset coil
Direction mark
Double coil latch type
(Reset position)
1 2 3 4 5
10 9 8 7 6
Set coil
Reset coil
Direction mark
Double coil latch type
(Reset position)
0501F
EA2-5NU
JAPAN
(1) (2)
(3)
(4)
(5)
(6)
0501F
EA2-5NU
JAPAN
(1) (2)
(3)
(4)
(5)
(6)
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0886EMDD03VOL01E
EA2/EB2 SERIES
4
GENERAL SPECIFICATIONS
Contact Form 2 Form C
Contact Material Silver alloy with gold alloy overlay
Maximum Switching Power 30 W, 62.5 VA
Maximum Switching Voltage 220 VDC, 250 VAC
Maximum Switching Current 1 A
Contact Ratings
Maximum Carrying Current 2 A
Minimum Contact Ratings 10 m VDC, 10µA *1
Initial Contact Resistance 75 m max. (initial)
Operate Time (Excluding bounce) Approx. 2 ms
Release Time (Excluding bounce) Approx. 1 ms
Insulation Resistance 1000 M at 500 VDC
Between open
contacts 1000 VAC (for one minute) 1500 V surge (10x160 µs *2)
Between adjacent
contacts 1000 VAC (for one minute) 1500 V surge (10x160 µs *2)
Withstanding Voltage
Between coil and
contacts 1000 VAC (for one minute) , 1500 V surge (10x160 µs *2)
Shock Resistance 735 m/s2 (75G) (misoperation)
980 m/s2 (100G) (destructive failure)
Vibration Resistance
10 to 55 Hz, double amplitude 3 mm(20G) (misoperation)
10 to 55 Hz, double amplitude 5 mm(30G) (destructive
failure)
Ambient Temperature -40 to +85 °C
Coil Temperature Rise 18 °C at nominal coil voltage (140mW)
Non-load 1x108 operations (Non-latch type) *3
1x107 operations (Latch type)
50 VDC 0.1A (resistive), 1x106 operations at 85 °C,5Hz
Running Specifications
Load 10 VDC 10mA (resistive), 1x106 operations at 85 °C,2Hz
Weight Approx. 1.5 g
* 1 This value is a reference value in the resistance load.
Minimum capacity changes depending on switching frequency and environment temperature and the load.
* 2 rise time: 10 µs, decay time to half crest: 160 µs
* 3 This shows the number of operations with fatal defects. Stable characteristics are maintained for 1×10 7 operations.
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0886EMDD03VOL01E
EA2/EBE2 SERIES
5
COIL SPECIFICATIONS
Non-latch Type at 20 °C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
()±10%
Must Operate
Voltage*
(VDC)
Must Release
Voltage*
(VDC)
Nominal
Operating Power
(mW)
3 64.3 2.25 0.3 140
4.5 145 3.38 0.45 140
5 178 3.75 0.5 140
12 1028 9.0 1.2 140
24 2880 18.0 2.4 200
Sin
gle Coil Latch Type at 20 °C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
()±10%
Set
Voltage*
(VDC)
Reset
Voltage*
(VDC)
Nominal
Operating Power
(mW)
3 90 2.25 2.25 100
4.5 202.5 3.38 3.38 100
5 250 3.75 3.75 100
12 1440 9.0 9.0 100
24 3840 18.0 18.0 150
Double Coil Latch Type (Can not be driven by reverse polarity for reverse operation) at 20 °C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
()±10%
Set
Voltage**
(VDC)
Reset
Voltage**
(VDC)
Nominal
Operating Power
(mW)
S 64.3 2.25 -
3 R 64.3 - 2.25 140
S 145 3.38 -
4.5 R 145 - 3.38 140
S 178 3.75 -
5 R 178 - 3.75 140
S 1028 9.0 -
12 R 1028 - 9.0 140
S 2880 18.0 -
24 R 2880 - 18.0 200
Note * Test by pulse voltage
** S : Set coil (pin No.1 ... (+) , pin No.5 ...(-) ) R : Reset coil (pin No.10...(+) , pin No.6...(-) )
The latch type relays should be initialized at appointed position before using, and should be
energized to specific polarity by above polarity to avoid wrong operation.
Any special coil requirement, please contact EM Devices for availability.
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0886EMDD03VOL01E
EA2/EB2 SERIES
6
SAFETY STANDARD AND RATING
UL Recognized
(UL508)*
File No E73266
CSA Certificated
(CSA C22.2 No14)
File No LR46266
30 VDC, 1 A (Resistive)
110 VDC, 0.3 A (Resistive)
125 VAC, 0.5 A (Resistive)
* Spacing: UL114, UL478
RECOMMENDED RELAY DRIVE CONDITIONS
Drive under conditions. If it is impossible, please inquire to EM Devices.
Non-latch type Voltage: within ±5% of nominal voltage
Single coil latch type
Double coil latch type
Square pulse (rise and fall time is rapid)
Pulse height : within ±5% of nominal voltage
Pulse width : More than 10 ms
Ambient temperature
- 40 to +85 °C
PART NUMBER SYSTEM
E A 2 - 3 S N U
NU: Standard
NJ: Trimmed lead type
Nil: Non-latch type
S: Single coil latch type
T: Double coil latch type
Nominal coil voltage
(A numerical value of coil voltage)
EA2 series
E B 2 – 3 S N U – L
Packing
Nil: Tube
L: Embossed carrying tape
NU: Standard
Nil: Non-latch type
S: Single coil latch type
T: Double coil latch type
Nominal coil voltage
(A numerical value of coil voltage)
EB2 series
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0886EMDD03VOL01E
EA2/EBE2 SERIES
7
ORDERING PART NUMBERS
EA2 series
Option Coil Type
Terminal Packing
Nominal
Coil Voltage
(VDC) Non-latch Single Coil Latch Double Coil Latch
3 EA2-3NU EA2-3SNU EA2-3TNU
4.5 EA2-4.5NU EA2-4.5SNU EA2-4.5TNU
5 EA2-5NU EA2-5SNU EA2-5TNU
12 EA2-12NU EA2-12SNU EA2-12TNU
Standard
24 EA2-24NU EA2-24SNU EA2-24TNU
3 EA2-3NJ EA2-3SNJ EA2-3TNJ
4.5 EA2-4.5NJ EA2-4.5SNJ EA2-4.5TNJ
5 EA2-5NJ EA2-5SNJ EA2-5TNJ
12 EA2-12NJ EA2-12SNJ EA2-12TNJ
Trimmed
lead
Tube
24 EA2-24NJ EA2-24SNJ EA2-24TNJ
EB2 series
Option Coil Type
Terminal packing
Nominal
Coil Voltage
(VDC) Non-latch Single Coil Latch Double Coil Latch
3 EB2-3NU EB2-3SNU EB2-3TNU
4.5 EB2-4.5NU EB2-4.5SNU EB2-4.5TNU
5 EB2-5NU EB2-5SNU EB2-5TNU
12 EB2-12NU EB2-12SNU EB2-12TNU
Tube
24 EB2-24NU EB2-24SNU EB2-24TNU
3 EB2-3NU-L EB2-3SNU-L EB2-3TNU-L
4.5 EB2-4.5NU-L EB2-4.5SNU-L EB2-4.5TNU-L
5 EB2-5NU-L EB2-5SNU-L EB2-5TNU-L
12 EB2-12NU-L EB2-12SNU-L EB2-12TNU-L
Standard
Taping
24 EB2-24NU-L EB2-24SNU-L EB2-24TNU-L
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0886EMDD03VOL01E
EA2/EB2 SERIES
8
PERFORMANCE DATA
0 100 200 300
60
40
20
0
App
lied
p
ower
(
mW
)
0 5 10 15 20
30
20
10
0
A
pplied time (minute)
COIL TEMPERATURE RISE
Tem
p
erature is measured b
y
coil resistance
A
pplied power 0.1W
A
pplied power 0.14W
A
pplied power 0.2W
Coil temperature
rise (°C )
Coil temperature
rise (°C)
-40 -20 0 20 40 60 80 100
200
150
100
50
A
mbient tem
p
erature
(
° C
)
10 20 50 100
2.0
1.0
0.5
0.2
0.1
Contact volta
e
V
SWITCHING CAPACITY
These are maximum values.
Inquire with EM Devices for maximum values under continuous use.
MAXIMUM COIL VOLTAGE
This is a maximum value of permissible alteration.
Inquire with EM Devices under continuous use.
DC(Resistive)
AC(Resistive)
250VAC
220VDC
Contact
current (A)
Ratio o
f
nominal
coil
voltage
(%)
0 100 150 200 250
0
A
pplied power (mW)
1
2
3
4
0 100 200 300 400
0
A
pplied power (mW)
1
2
3
4
APPLIED VOLTAGE VS. TIMING (Sample: EA2-5NU)
(
Without coil diode
)
Operate
time
(ms)
Release
time
(ms)
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0886EMDD03VOL01E
EA2/EBE2 SERIES
9
Release volta
g
e
(
t
yp
ical
)
OPERATE AND RELEASE VOLTAGE VS.AMBIENT TEMPERATURE
-40 -20 0 20 40 60 80 100
100
80
60
40
20
0
A
mbient temperature (°C)
Must operate voltage
Operate voltage (typical)
Ratio of nominal
coil voltage (%)
5
4
3
2
1
0
0 20 50 100 500 1000
RUNNING TEST (Non-load)
(Load: none, Drive:5VDC50Hz50%duty, Ambient temperature :room temperature, Sample:EA2-5NU ,20pieces)
Operate voltage
R
e
l
ease
v
o
l
tage
0 20 50 100 500 1000
10000
1000
100
10
Contact
resistance
(m)
Operate
voltage
(V)
Release
voltage
(V)
Operations (×104)Operations (×104)
10000
1000
100
10
5
4
3
2
1
0
0 2 5 10 50 100
RUNNING TEST(Load)
(Load: 50VDC 0.1A resistive, Drive: 5VDC,5Hz,50%duty,Ambient temperature:85 °C, Sample:EA2-5NU ,10pieces)
Contact
resistance
(m)
Operate
voltage
(V)
Release
0 2 5 10 50 100
Operations (×104)
Operations (×104)
Operate voltage
Release voltage
This shows a typical change of operate (release) voltage. The value of must operate is estimated, so coil voltage must be applied
more than this value for safety operation. For hot start operation, please inquire with EM Devices.
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0886EMDD03VOL01E
EA2/EB2 SERIES
10
100
50
0 0.5 1.0 1.5 2.0
Breakdown voltage (K V)
100
50
0 1.0 1.5 2.0 2.5
100
50
0 0.5 1.5 2.0 2.5
BREAKDOWN VOLTAGE
Sample: EA2-5NU 10peices
(a) Between open contacts
(
b
)
Between ad
j
acent contacts
(C) Between coil and
ALTERNATION OF VOLTAGE IN DENSE MOUNTING (magnet interference)
Distribution
Distribution
(
%
)
Di
s
tri
bu
ti
o
n
(%)
Breakdown voltage (K V)
Breakdown voltage (K V)
Device under test
a b c d e
f
+40
+30
+20
+10
0
-10
-20
-30
-40
Mountin
g
la
y
out
A
lternation of operate voltage
Ratio of
alternation (%)
+40
+30
+20
+10
0
-10
-20
-30
-40
Mounting layout
a b c d e
f
Ratio of
alternation (%)
A
lternation of operate voltage
ON
ON
ON
OFF
OFF
OFF
e
f
ON ON OFF OFF
ON
ON
OFF
OFF
a b c d
2.54mm
2.54mm
2.54mm
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0886EMDD03VOL01E
EA2/EBE2 SERIES
11
PAKING DIMENSIONS (Unit: mm)
TUBE PACKING (EA2/EB2)
40 pieces / Tube (anti-static)
TAPE PACKING (EB2)
APPEARANCE 750 pieces / Reel
Reel diameter: 380mm
TAPE DIMENSIONS
RELAY DIRECTION MARK AND TAPE CARRYING DIRECTION
Reel
Top cover tape
Emboss
Carrying tape
Reel
Top cover tape
Emboss
Carrying tape
24.0
4
Φ1.5
Φ2.2
16
11.5
2.0 1.75
12.1
0.4
max. 8.1
14.7
24.0
4
Φ1.5
Φ2.2
16
11.5
2.0 1.75
12.1
0.4
max. 8.1
14.7
13.7 586
12.0
Rubber stopper (Red)
Direction of relay direction mark
Rubber stopper (Green)
13.7 586
12.0
Rubber stopper (Red)
Direction of relay direction mark
Rubber stopper (Green)
Direction mark
Sprocket hole
Direction of unreeling
Direction mark
Sprocket hole
Direction of unreeling
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0886EMDD03VOL01E
EA2/EB2 SERIES
12
SOLDERING TEMPERATURE CONDITION
THROUGH-HOLE MOUNTING (EA2)
1. Automatic soldering
Preheating: 110~ 120°C /110 sec. (max.)
Solder temperature: 260°C max.
Solder time: 5 seconds max.
Note: EM Devices recommends cooling down a printed circuit board less than
110°C within 40 seconds after soldering.
2. Manual soldering
Solder temperature: 350°C max.
Solder time: 3 seconds max.
SURFACE-MOUNTING TYPE (EB2)
IRS Method
Note:
1. Temperature profile shows printed circuit board surface temperature on the relay
terminal portion.
2. Please consult EM Devices if you wish to use a temperature profile other than above.
200
180
190 (max.300)
45 (max.70)
70 (max.120)
Temperature
()
220
max. 240
Time (sec.)
200
180
190 (max.300)
45 (max.70)
70 (max.120)
Temperature
()
220
max. 240
Time (sec.)
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0886EMDD03VOL01E
EA2/EBE2 SERIES
13
NOTE ON CORRECT USE
1. Notes on contact load
Make sure that the contact load is within the specified range;
otherwise, the lifetime of the contacts will be shortened
considerably.
Note that the running performance shown is an example,
and that it varies depending on parameters such as the
type of load, switching frequency, driver circuit, and
ambient temperature under the actual operating conditions.
Evaluate the performance by using the actual circuit before
using the relay.
2. Driving relays
- If the internal connection diagram of a relay shows + and -
symbols on the coil, apply the rated voltage to the relay in
the specified direction. If a rippled DC current source is
used, abnormalities such as beat at the coil may occur.
- The maximum voltage that can be applied to the coil of the
relay varies depending on the ambient temperature.
Generally, the higher the voltage applied to the coil, the
shorter the operating time. Note, however, that a high
voltage also increases the bounce of the contacts and
the contact opening and closing frequency, which may
shorten the lifetime of the contacts.
- If the driving voltage waveform of the relay coil rises and
falls gradually, the inherent performance of the relay may not
be fully realized. Make sure that the voltage waveform
instantaneously rises and falls as a pulse.
- For a latching relay, apply a voltage to the coil according to
the polarity specified in the internal connection diagram of
the relay.
- If a current is applied to the coil over a long period of time,
the coil temperature rises, promoting generation of organic
gas inside the relay, which may result in faulty contacts. In
this case, use of a latching relay is recommended.
- The operating time and release time indicate the time
required for each contact to close after the voltage has been
applied to or removed from the coil. However, because the
relay has a mechanical structure, a bounce state exists at
the end of the operating and release times. Furthermore,
because additional time is required until the contact
stabilizes after being in a high-resistance state, care must be
taken when using the relay at high speeds.
3. Operating environment
- Make sure that the relay mounted in the application set is
used within the specified temperature range. Use of a relay
at a temperature outside this range may adversely affect
insulation or contact performance.
- If the relay is used for a long period of time in highly humid
(RH 85% or higher) environment, moisture may be absorbed
into the relay. This moisture may react with the NOx and
SOx generated by glow discharges that occur when the
contacts are opened or closed, producing nitric or sulfuric
acid. If this happens, the acid produced may corrode the
metallic parts of the relay, causing operational malfunction.
- If any material containing silicon (silicon rubber, silicon oil,
and silicon based coating material) is used in the
neighborhood of relay, there is some possibility that these
materials will emit silicon gas that will penetrate the relay. In
this case, the switching contact may generate silicon
compounds on the surface of contacts. This silicon
compound may result in contact failure. Avoid use of relay in
such an environment.
- Because the operating temperature range varies
depending on the humidity, use the relay in the temperature
range illustrated in the figure below. Prevent the relay from
being frozen and avoid the generation of condensation.
- The relay maintains constant sealability under normal
atmospheric pressure (810 to 1,200 hpa). Its sealability may
be degraded or the relay may be deformed and malfunction
if it is used under barometric conditions exceeding the
specified range.
- The same applies when the relay is stored or transported.
Keep the upper-limit value of the temperature to which the
relay is exposed after it is removed from the carton box to
within 50°C.
- Permanent magnets are used in polarized relays. For this
reason, when magnets, transformers, or speakers are
located nearby the relay characteristics may change and
faulty operations may result.
- If excessive vibration or shock is applied to the relay, it may
malfunction and the contacts remain closed. Vibration or
shock applied to the relay during operation may cause
considerable damage to or wearing of the contacts. Note that
operation of a snap switch mounted close to the relay or
shock due to the operation of magnetic solenoid may also
cause malfunctioning.
Nominal
coil voltage
0
<1msec. <1msec.
-60 -40 -20 0 20 40 60 80 100
80
Temperature (°C )
60
40
20
85
5
Humidit
y
(%RH)
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Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
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4. Notes on mounting relays
- When mounting a relay onto a PC board using an
automatic chip mounter, if excessive force is applied to the
cover of the relay when the relay is chucked or inserted, the
cover may be damaged or the characteristics of the relay
degraded. Keep the force applied to the relay to within 1 kg.
- Avoid bending the pins to temporarily secure the relay to
the PC board. Bending the pins may degrade sealability or
adversely affect the internal mechanism.
- It is recommended to solder the relay onto a PC board
under the following conditions:
<1> Reflow soldering
Refer to the recommended soldering temperature profile.
<2> Flow soldering
Solder temperature: 260°C max., Time: 5 seconds max.
Preheating: 110~ 120°C /110 sec. (max.)
<3> Manual soldering
Solder temperature: 350°C, Time: 2~3 seconds
- Ventilation immediately after soldering is recommended.
Avoid immersing the relay in cleaning solvent immediately
after soldering due to the danger of thermal shock being
applied to the relay.
- Use an alcohol-based or water-based cleaning solvent.
Never use thinner and benzene because they may damage
the relay housing.
- Do not use ultrasonic cleaning because the vibration
energy generated by the ultrasonic waves may cause the
contacts to remain closed.
5. Handling
- Relays are packaged in magazine cases for shipment. If a
space is created in the case after some relays have been
removed, be sure to insert a stopper to secure the remaining
relays in the case. If relays are not well secured, vibration
during transportation may cause malfunctioning of the
contacts.
- Exercise care in handling the relay so as to avoid dropping
it or allowing it to fall. Do not use a relay that has been
dropped. If a relay drops from a workbench to the floor, a
shock of 9,800 m/s2 (1,000 G) or more is applied to the relay,
possibly damaging its functions. Even if a light shock has
been applied to the relay, thoroughly evaluate its operation
before using it.
- Latching relays are factory-set to the reset state for
shipment. A latching relay may be set, however, by vibration
or shock applied while being transported. Be sure to forcibly
reset the relay before using it in the application set. Also note
that the relay may be set by unexpected vibration or shock
when it is used in a portable set.
- The sealability of a surface-mount (SMT) relay may be lost
if the relay absorbs moisture and is then heated during
soldering. When storing relays, therefore, observe the
following points:
<1> For standard packing, please use relays within 12
months after delivery. (Storage conditions: 30 °C / 60% RH)
If the relays have moisture absorption, dehumidify as follows.
Tape packing: 50±5 °C, 200~300 hours.
Simple relay: 85±5 °C, 48 hours.
<2> For MBB packing, please use relays within 2 years after
delivery.
(Storage conditions: 30 °C / 60% RH)
After open MBB packing, please use within 3 months.
(Storage conditions: 30 °C / 60% RH)
Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0886EMDD03VOL01E
EA2/EBE2 SERIES
15
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