For Correct 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 NEC/TOKIN's "Miniature Relays" when you choose relays for your application.
The information in this document is subject to change without notice.
Document No. 0612EMDD03VOL02E
Date Published May 2005 P
Printed in Japan
© NEC TOKIN Corporation 2002
DATA SHEET
MINIATURE SIGNAL RELAY
UA2/UB2 SERIES
Super-compact size, Slim-package, Surface-mounting type available
DESCRIPTION
NEC TOKIN's UA2/UB2 relay ia a new generation miniature signal relay of super-compact size and slim-pakage.
FEATURES
Small mounting size of slim package for dense mounting.
Telcordia (2500 V) and FCC (1500 V) surge capability.
IEC60950/UL1950/EN60950 spacing and high breakdown voltage.
(Basic insulation class on 200 V working voltage)
Low power consumption 140 mW
APPLICATIONS
Electronic switching systems, PBX, terminal equipment, telephone system.
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DIMENSIONS AND PAD LAYOUTS (Unit : mm [inch])
UA2 SERIES
● STANDARD
UB2 SERIES
● STANDARD
● MINIMUM FOOTPRINT TYPE
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PIN CONFIGURATIONS (bottom view)
UA2 SERIES
UB2 SERIES
MARKINGS (top view)
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PERFORMANCE CHARACTERISTICS (Community)
Contact Form 2 Form c
Maximum Switching Power 30 W (resistive) 37.5 VA (resistive)
Maximum Switching Voltage 220 Vdc 250 Vac
Maximum Switching Current 1 A
Contact Ratings
Maximum Carrying Current 1 A
Minimum Contact Ratings 10 mV.dc, 10 µA ＊4
Initial Contact Resistance 100 mΩ Max. (Initial)
Contact Material Silver alloy with gold alloy overlay
Non-Latch Type 140 to 230 mW
Nominal Operating Power Single Coil Latch Type 100 to 120 mW
Operate Time (Excluding Bounce) Approximately 2 ms
Release Time (Excluding Bounce) Approximately 1 ms without diode
Insulation Resistance 1000 MΩ at 500 Vdc
Between Open Contacts
Between Adjacent Contacts
1000 Vac for one minute (1500 V surge, 10 × 160 µs ＊1)
Breakdown Voltage
Between Coil and Contact 1500 Vac for one minute (2500 V surge, 2 × 10 µs ＊2)
Shock Resistance 735 m / s2 (misoperating)
980 m / s2 (destructive failure)
Vibration Resistance
10 to 55 Hz at double amplitude of 3 mm
(misoperating)
10 to 55 Hz, double amplitude of 5 mm
(Destructive failure)
Ambient Temperature - 40 to +85°C
Coil Temperature Rise 18 degrees at nominal coil voltage (140 mW)
5 × 107 ＊3 operations (Non-latch type)
No-load 1 × 107 operations (Latch type)
30 Vdc 1 A (resistive), 1 × 105 operations at 20°C
Running specifications
Load 125 Vac 0.3 A (resistive), 1 × 105 operations at 20°C
Weight Approximately 1 grams
＊1 rise time : 10 µs, decay time to half crest : 160 µs
＊2 rise time : 2 µs, decay time to half crest : 10 µs
＊3 This shows a number of operation where it can be running by which a fatal is not caused, and number of operation by
wich a stesdy characteristic is maintained is 1 × 107 operations.
＊4 This value is a reference value in the resistive load.
Minimum capacity changes depending on seitching frequency and enviroment temperature and the load.
SAFETY STANDARD AND RATING
TUV Certified
(EN61810)
UL Recognized
(UL508)＊
File No E73266
CSA Certificated
(CSA C22.2 No14)☆
File No LR46266 No.2050596
30 Vdc, 1 A (Resistive)
110 Vdc, 0.3 A (Resistive)
125 Vac, 0.3 A (Resistive)
Creepage and clearance of coil to contact is over
than 2 mm (According EN60950)
Basic insulation class
＊ Spacing : UL840
☆ Spacing : CSAstd950
RECOMMENDED RELAY DRIVE CONDITIONS
Drive under condetions. If it is impossible, please inquire to NEC/TOKIN
Nonlatch type Voltage : with ±5% at nominal voltage
Single coil latch type
Square pulse (rise and fall time is repidly)
pulse height : within ±5% at nominal voltage
pulse width : more than 10 ms
Ambient temperature
- 40 to +85°C
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PART NUMBER SYSTEM
NOMINAL LINEUP
Non-latch Type at 20°C
Nominal Coil
Voltage
(Vdc)
Coil
Resistance
(Ω) ±10 %
Must Operate
Voltage
(Vdc)
Must Release
Voltage
(Vdc)
Nominal
operate power
(mW)
1.5 16 1.13 0.15 140
3 64.3 2.25 0.3 140
4.5 145 3.38 0.45 140
5 178 3.75 0.5 140
6 257 4.5 0.6 140
9 579 6.75 0.9 140
12 1028 9.0 1.2 140
24 2504 18.0 2.4 230
Single-Coil Latch Type at 20°C
Nominal Coil
Voltage
(Vdc)
Coil
Resistance
(Ω) ±10 %
Must Operate
Voltage
(Vdc)
Must Release
Voltage
(Vdc)
Nominal
operate power
(mW)
1.5 22.5 1.13 1.13 100
3 90 2.25 2.25 100
4.5 202.5 3.38 3.38 100
5 250 3.75 3.75 100
6 360 4.5 4.5 100
9 810 6.75 6.75 100
12 1440 9.0 9.0 100
24 4800 18.0 18.0 120
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PERFORMANCE DATA
■COIL TEMPERATURE RISE
Temperature is measured by coil resistance.
■SWITCHING CAPACITY ■MAXIMUM COIL VOLTAGE
This is allowed maximum value.
Inquiry for NEC/TOKIN under maximum value at
continuous use.
This is a maximum value of permissible alteration.
Inquiry for NEC/TOKIN at continuous use..
■APPLIED VOLTAGE VS. TIMING (Sample: UA2-5NU)
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■OPERATE AND RELEASE VOLTAGE VS. AMBIENT TEMPERATURE
This shows a typical change of operate (release) voltage. Maximum value of operate estimated, so it must be
applied more than this value for safety operation. In case of “hot start operation”, please inquiry for NEC/TOKIN.
■RUNNING TEST (Nonload)
(Load: None, Driving: 5V.DC, 50 Hz, 50% duty, Ambient temperature: Room temperature, Sample: UA2-5NU 20 pieces)
■RUNNING TEST (Load)
(Load: 50 V.DC 0.1 A resistive, Driving: 5V.DC, 5 Hz, 50% duty, Ambient temperature: 85 degree C, Sample: UA2-5NU
10 pieces)
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■BREAKDOWN VOLTAGE
Sample: UA2-5NU 10 pieces
■ALTERNATION OF VOLTAGE AT DENSELY MOUNTING (Magnet interference)
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TUBE PACKAGE (UA2, UB2)
Dimensions of Package (Unit : mm)
Outline of Package
TAPE PACKAGE (UB2)
APPEARANCE TAPE DIMENSIONS mm
(inch)
Relay orientation mark and tape carrying direction.
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SOLDERING TEMPERATURE CONDITION
Through–hole mounting type (UA2)
① Automatic soldering
* Preheating : 100°C max. 1 minute max.
* Solder temperature : 260°C max.
* Solder time : 5 seconds max.
② Manual soldering
* Solder temperature : 350°C max.
* Solder time : 3 seconds max.
Surface mounting type (UB2)
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.
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UA2/UB2 SERIES
Coil rated voltage
Less than 1 ms
0
Less than 1 ms
85
5
−60 −40 −20 0 20
Temperature (°C)
Humidiry (%RH)
40 60 80 100
80
60
40
20
NOTES 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 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.
● 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.
● 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.
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: 100˚C max./1 minute max.
<3> Manual soldering
Solder temperature: 350˚C, Time: 2 to 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 relay may be lost if the
relay absorbs moisture and is then heated during soldering.
When storing relays, therefore, observe the following points:
<1> Please use relays within 12 months after delivery. (Storage
conditions : 30 degrees C / 60% RH)
<2> For MBB packing, Please use relays within 2 years after delivery.
(Storage conditions : 30 degrees C / 60% RH)
After opening MBB packing, Please use within 3 months.
(Storage conditions : 30 degrees C / 60% RH)
Permanent magnets are used in polarized relays.
For this reason, when magnet, transformer, or speaker is
located nearby, the relay characteristics may change and faulty
operations may result.
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No part of this document may be copied or reproduced in any form or by any means without the prior written
consent of NEC/TOKIN Corporation. NEC/TOKIN Corporation assumes no responsibility for any errors which
may appear in this document.
NEC/TOKIN Corporation does not assume any liability for infringement of patents, copyrights or other
intellectual property rights of third parties by or arising from use of a device described herein or any other liability
arising from use of such device. No license, either express, implied or otherwise, is granted under any patents,
copyrights or other intellectual property rights of NEC/TOKIN Corporation or others. While NEC/TOKIN
Corporation has been making continuous effort to enhance the reliability of its electronic components, the
possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property
arising from a defect in an NEC/TOKIN electronic component, customers must incorporate sufficient safety
measures in its design, such as redundancy, fire-containment, and anti-failure features. NEC/TOKIN devices
are classified into the following three quality grades:
"Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a
customer designated "quality assurance program" for a specific application. The recommended applications of a
device depend on its quality grade, as indicated below. Customers must check the quality grade of each device
before using it in a particular application.
Standard: Computers, office equipment, communications equipment, test and measurement equipment,
audio and visual equipment, home electronic appliances, machine tools, personal electronic
equipment and industrial robots
Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster
systems, anti-crime systems, safety equipment and medical equipment (not specifically designed
for life support)
Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life
support systems or medical equipment for life support, etc.
The quality grade of NEC/TOKIN devices is "Standard" unless otherwise specified in NEC/TOKIN's Data Sheets
or Data Books. If customers intend to use NEC/TOKIN devices for applications other than those specified for
Standard quality grade, they should contact an NEC/TOKIN sales representative in advance.
(Note)
(1) "NEC/TOKIN" as used in this statement means NEC/TOKIN Corporation and also includes its
majorityowned subsidiaries.
(2) "NEC/TOKIN electronic component products" means any electronic component product developed or
manufactured by or for NEC/TOKIN (as defined above).
DE0202
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