●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
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
UC2/UD2 SERIES
SUPER-COMPACT SIZE, FLAT-PACKAGE
DESCRIPTION
NEXEM UC2/UD2 relay is a new generation miniature signal relay, super-compact and slim.
FEATURES
 Small mounting size of flat package for dense mounting
 Telcordia (2500 V) and FCC (1500 V) surge capacity
 IEC60950/UL1950/EN60950 spacing and high breakdown voltage
(Basic insulation class on 200 V working voltage)
 Low power consumption (100-140 mW)
APPLICATIONS
Electronic switching systems, PBX, Terminal equipment, Telephone system
R
Ro
oH
HS
S
C
Co
om
mp
pl
li
ia
an
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t
●
●Pleaserequestforaspecificationsheetfordetailedproduct
datapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precaut
ions"andothersafetyprecautionslistedintheprintedversio
ncatalog.
0894EMDD03VOL03E
UC2/UD2SERIES
2
DIMENSIONSANDPADLAYOUTS Unit:mm(inch)
UC2SERIES
UD2SERIES
STANDARD
MINIMUMFOOTPRINTTYPE
10.6(0.417) 6.5(0.256)
5.08
(0.2)
3.2
(0.126)
2.2
(0.087)
2.2
(0.087)
[1.5] [1.5]
5.3
(0.209)
3.4
(0.134)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
NJtype:Leadlength2.8mm
10.6(0.417) 6.5(0.256)
5.08
(0.2)
3.2
(0.126)
2.2
(0.087)
2.2
(0.087)
[1.5] [1.5]
5.3
(0.209)
3.4
(0.134)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
NJtype:Leadlength2.8mm
10.6(0.417)
5.45
max.
(0.215)
3.2
(0.126) 2.2
(0.087)
2.2
(0.087)
[1.5]
[1.5]
6.5(0.256)
5.08
(0.2)
8.4(0.331)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
0.2
10.6(0.417)
5.45
max.
(0.215)
3.2
(0.126) 2.2
(0.087)
2.2
(0.087)
[1.5]
[1.5]
6.5(0.256)
5.08
(0.2)
8.4(0.331)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
0.2
10.6(0.417)
6.0
max.
(0.236)
3.2
(0.126) 2.2
(0.087)
2.2
(0.087)
[1.5]
[1.5]
6.5(0.256)
5.08
(0.2)
6.8(0.268)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
0
10.6(0.417)
6.0
max.
(0.236)
3.2
(0.126) 2.2
(0.087)
2.2
(0.087)
[1.5]
[1.5]
6.5(0.256)
5.08
(0.2)
6.8(0.268)
Toleranceofleadpitchis±0.15mm(0.006inch)
Othertolerances±0.3mm(0.012inch)
Leadsize0.4x0.2 ±0.1
0.
7.6
3.22.2 8-Φ0.85
5.08
(mm)
NOTE .Ge neraltolerance:±0.1
(Bottomview)
(1.5) (1.5)
7.6
3.22.2
5.08
(mm)
NOTE .Generaltolerance: ±0.1
(Bottomview)
(1.5) (1.5)
NOTE.Generaltolerance: ±0.1
(Topview)
NOTE.Generaltolerance: ±0.1
(Topview)
±0.1
(Topview)
NOTE.Generaltolerance: ±0.1
(Topview)
7.6
2.22.23.2
0.8
(mm)
(1.5) (1.5)
2.66
6.74
(1.5) (1.5)
7.6
3.2 2.2 2.2
0.8
5.94
1.86
(mm)
Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
3
PIN CONFIGURATIONS (Bottom view)
MARKINGS (top view)
(1) Part number
(2)
Manufacturer
(3) Country of origin
(4) Date code
(5) Direction mark (pin No. 1 and 8)
UD2-4.5NU
JAPAN
0501F
(1)
(2) (3)
(4)
(5)
UD2-4.5NU
JAPAN
0501F
(1)
(2) (3)
(4)
(5)
1 2 3 4
8 7 6 5
+
S
-
Direction mark
-
R
+
Single coil latch type
(Reset position)
S: Coil polarity for Set
R: Coil polarity for Reset
1 2 3 4
8 7 6 5
+
S
-
Direction mark
-
R
+
Single coil latch type
(Reset position)
S: Coil polarity for Set
R: Coil polarity for Reset
1 2 3 4
8 7 6 5
+
-
Direction mark
Non-latch type
(Not energized position)
1 2 3 4
8 7 6 5
+
-
Direction mark
Non-latch type
(Not energized position)
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
4
GENERAL SPECIFICATIONS
Contact Form 2 Form C
Contact Material Silver alloy with gold alloy overlay
Maximum Switching Power 30 W, 37.5 VA
Maximum Switching Voltage 220 VDC, 250 VAC
Maximum Switching Current 1 A
Contact Ratings
Maximum Carrying Current 1 A
Minimum Contact Ratings 10 m VDC, 10µA *1
Initial Contact Resistance 100 m Ω max. (initial)
Operate Time (Excluding bounce) Approx. 2 ms
Release Time (Excluding bounce) Approx. 1 ms
Insulation Resistance 1000 MΩ 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 1500 VAC (for one minute) , 2500 V surge (2x10 µs *3)
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)
-40 to +85 °C
Ambient Temperature -40 to +70 °C (Low power consumption type)
Coil Temperature Rise 18 °C at nominal coil voltage (140mW)
Non-load 5x107 operations (Non-latch type) *4
1x107 operations (Latch type)
30 VDC 1A (resistive), 1x105 operations at 20°C,1Hz
Running Specifications
Load 125 VAC 0.3A (resistive), 1x105 operations at 20°C,1Hz
Weight Approx. 0.8 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 rise time: 2 µs, decay time to half crest: 10 µs
* 4 This shows the number of operations with fatal defects. Stable characteristics are maintained for 1×10 7 operations.
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
5
COIL SPECIFICATIONS
Non-latch Type at 20°C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
(Ω)±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
9 579 6.75 0.9 140
12 1028 9.0 1.2 140
Single Coil Latch Type at 20°C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
(Ω)±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
9 810 6.75 6.75 100
12 1440 9.0 9.0 100
Non-latch Low Power Consumption Type at 20°C
Nominal
Coil Voltage
(VDC)
Coil
Resistance
(Ω)±10%
Must Operate
Voltage*
(VDC)
Must Release
Voltage*
(VDC)
Nominal
Operating Power
(mW)
3 90 2.4 0.3 100
4.5 202.5 3.6 0.45 100
5 250 4.0 0.5 100
Note * Test by pulse voltage
SAFETY STANDARD AND RATING
TUV Certificate
(EN61810)
UL Recognized
(UL508)*
File No E73266
CSA Certificated
(CSA C22.2 No14)**
File No LR46266
No. 2050596
Creepage and clearance of
coil to contact is more than 2 mm.
(According to EN60950)
Basic insulation class
30 VDC, 1 A (Resistive)
110 VDC, 0.3 A (Resistive)
125 VAC, 0.5 A (Resistive)
* Spacing: UL840, **Spacing :CSA std950
RECOMMENDED RELAY DRIVE CONDITIONS
Drive under conditions. If it is impossible, please inquire to EM Devices.
Non-latch type Ambient temperature
- 40 to +85 °C
Non-latch type
(Low power consumption Type)
Voltage: within ±5% of nominal voltage
Ambient temperature
- 40 to +70 °C
Single coil latch type
Square pulse (rise and fall time is rapidly)
pulse height : within ±5% of nominal voltage
pulse width : more than 10 ms
Ambient temperature
- 40 to +85 °C
UC2/UD2 SERIES
6
PART NUMBER SYSTEM
ORDERING PART NUMBERS
UC2 series
Option Coil Type
Terminal Packing
Nominal
Coil Voltage
(VDC) Non-latch Single Coil Latch
Non-latch
Low Power
Consumption
3 UC2-3NU UC2-3SNU UC2-3NE
4.5 UC2-4.5NU UC2-4.5SNU UC2-4.5NE
5 UC2-5NU UC2-5SNU UC2-5NE
9 UC2-9NU UC2-9SNU -
Standard
12 UC2-12NU UC2-12SNU -
3 UC2-3NJ UC2-3SNJ -
4.5 UC2-4.5NJ UC2-4.5SNJ -
5 UC2-5NJ UC2-5SNJ -
9 UC2-9NJ UC2-9SNJ -
Trimmed
lead
Tube
12 UC2-12NJ UC2-12SNJ -
U C 2 - 3 S N U
NU: Standard
NJ: Trimmed lead type
NE: Low power consumption type
Nil: Non-latch type
S: Single coil latch type
Nominal coil voltage
(A numerical value of coil voltage)
UC2 series
U D 2 – 3 S N U – L
Package
Nil: Tube
L: Embossed carrying tape
NU: Standard
NUN: Minimum footprint type
NE: Low power consumption type
NEN: Low power consumption, Minimum foot print type
Nil: Non-latch type
S: Single coil latch type
Nominal coil voltage
(A numerical value of coil voltage)
UD2 series
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
7
UD2 series
Option Coil Type
Terminal Packing
Nominal
Coil Voltage
(VDC) Non-latch Single Coil Latch
Non-latch
Low Power
Consumption
3 UD2-3NU UD2-3SNU UD2-3NE
4.5 UD2-4.5NU UD2-4.5SNU UD2-4.5NE
5 UD2-5NU UD2-5SNU UD2-5NE
9 UD2-9NU UD2-9SNU -
Tube
12 UD2-12NU UD2-12SNU -
3 UD2-3NU-L UD2-3SNU-L UD2-3NE-L
4.5 UD2-4.5NU-L UD2-4.5SNU-L UD2-4.5NE-L
5 UD2-5NU-L UD2-5SNU-L UD2-5NE-L
9 UD2-9NU-L UD2-9SNU-L -
Standard
Taping
12 UD2-12NU-L UD2-12SNU-L -
3 UD2-3NUN UD2-3SNUN UD2-3NEN
4.5 UD2-4.5NUN UD2-4.5SNUN UD2-4.5NEN
5 UD2-5NUN UD2-5SNUN UD2-5NEN
9 UD2-9NUN UD2-9SNUN -
Tube
12 UD2-12NUN UD2-12SNUN -
3 UD2-3NUN-L UD2-3SNUN-L UD2-3NEN-L
4.5 UD2-4.5NUN-L UD2-4.5SNUN-L UD2-4.5NEN-L
5 UD2-5NUN-L UD2-5SNUN-L UD2-5NEN-L
9 UD2-9NUN-L UD2-9SNUN-L -
Minimum
footprint
Taping
12 UD2-12NUN-L UD2-12SNUN-L -
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
8
PERFORMANCE DATA
0 100 200 300 400
60
40
20
0
A
pplied power (mW)
0 5 10 15 20
30
20
10
0
A
pplied time (minute)
-40 -20 0 20 40 60 80 100
200
150
100
50
A
mbient temperature (°C)
10 20 50 100
2.0
1.0
0.5
0.2
0.1
Contact volta
g
e
(
V
)
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
COIL TEMPERATURE RISE
Tem
p
erature is measured b
y
coil resistance
SWITCHING CAPACITY
This is allowed maximum value.
Inquire with EM Devices for maximum value under continuous
MAXIMUM COIL VOLTAGE
This is a maximum value of permissible alteration.
Inquire with EM Devices under continuous use.
APPLIED VOLTAGE VS. TIMING (Sample:UC2-5NU)
(
Without coil diode
)
DC(Resistive)
AC(Resistive)
250VAC
220VDC
A
pplied power 0.1W
A
pplied power 0.14W
Coil temperature
rise (°C )
Coil
temperature
rise (°C)
Contact
current (A)
Ratio o
f
nominal
coil
voltage
(%)
Operate
time
(ms)
Release
time
(ms)
Low power consumption type
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
9
10000
1000
100
10
-40 -20 0 20 40 60 80 100
100
80
60
40
20
0
A
mbient temperature (°C)
OPERATE AND RELEASE VOLTAGE VS.AMBIENT TEMPERATURE
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.
Must operate voltage
Operate voltage (typical)
Release volta
g
e
(
t
yp
ical
)
Ratio of nominal
coil voltage (%)
Operations (×104)
RUNNING TEST (Non-load)
(Load: none, Drive:5VDC，50Hz，50%duty, Ambient temperature :room temperature, Sample:UC2-5NU ,20pieces)
0 20 50 100 500 1000
10000
1000
100
10
Contact
resistance
(mΩ)
5
4
3
2
1
0
Operations (×104)
0 20 50 100 500 1000
Operate voltage
R
e
l
ease
v
o
l
tage
Operate
voltage
(V)
Release
voltage
(V)
RUNNING TEST(Load)
(Load: 50VDC 0.1A resistive,Drive:5VDC,5Hz,50%duty,Ambient temperature:85 °C, Sample:UC2-5NU ,10pieces)
Contact
resistance
(mΩ)
0 2 5 10 50 100
Operations (×104)
5
4
3
2
1
0
0 2 5 10 50 100
Operate
voltage
(V)
Release
Operations (×104)
Operate voltage
Release voltage
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 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 1.5 2.0 2.5 2.5over
BREAKDOWN VOLTAGE
Sample: UC2-5NU 10peices
(a) Between open contacts
(
b
)
Between ad
j
acent contacts
(C) Between coil and
ALTERNATION OF VOLTAGE IN DENSE MOUNTING (Magnetic interference)
Distribution
Distribution
(
%
)
Di
s
tri
bu
ti
o
n
(%)
Breakdown voltage (K V)
Breakdown voltage (K V)
ON ON OFF OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
e
f
Device under test
a b c d
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
2.5mm
3mm
●Allspecificationsinthiscatalogandproductionstatusofproductsaresubjecttochangewithoutnotice.Priortothepurchase,pleasecontactEM Devicesforupdatedproductdata.
●Pleaserequestforaspecificationsheetfordetailedproductdatapriortothepurchase.
●Beforeusingtheproductinthiscatalog,pleaseread"Precautions"andothersafetyprecautionslistedintheprintedversioncatalog.
0894EMDD03VOL03E
UC2/UD2 SERIES
11
PACKING DIMENSIONS (Unit: mm)
TUBE PACKING (UC2/UD2)
50 pieces / Tube (anti-static)
TAPE PACKING (UD2)
APPEARANCE 1200 pieces / Reel
Reel diameter: 380mm
TAPE DIMENSIONS
A B
UD2-xxNU-L
UD2-xxNE-L Max.6.2 9.2
UD2-xxNUN-L
UD2-xxNEN-L Max.6.6 7.5
RELAY DIRECTION AND TAPE CARRYING DIRECTION
Reel
Top cover tape
Emboss
Carrying tape
Reel
Top cover tape
Emboss
Carrying tape
Direction mark
Sprocket hole
Direction of unreeling
Direction mark
Sprocket hole
Direction of unreeling
24.0
4
Φ1.5
Φ2.2
12
11.5
2.0 1.75
B
0.4
A
11.4
24.0
4
Φ1.5
Φ2.2
12
11.5
2.0 1.75
B
0.4
A
11.4
11.0 560
12.1
Rubber stopper (Yellow)
Direction of relay direction mark
Rubber stopper (Green)
11.0 560
12.1
Rubber stopper (Yellow)
Direction of relay direction mark
Rubber stopper (Green)
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SOLDERING TEMPERATURE CONDITION
THROUGH-HOLE MOUNTING (UC2/UD2)
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 (UD2)
IRS Method
Note:
1. Temperature profile shows printed circuit board surface temperature on the relay
terminal portion.
2. Check the actual soldering condition to use other method except above mentioned
temperature profiles.
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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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
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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0894EMDD03VOL03E
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cause malfunctioning.
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)
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