Part Number: UB2-5NU-L

Manufacturer: KEMET


Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

UB2-5NU-L Description

Miniature signal relays from KEMET have an extremely small case size and a thin profile. A surface mount or through-hole design uses little of the board’s available space. These relays meet the FCC’s Part 68 requirements for a surge capacity of 1,500 V and have received approval from the Underwriters Laboratories and the Canadian Standards Association.

UB2-5NU-L Applications

  • PBX
  • Terminal equipment
  • Telephone systems


  • Low power consumption (< 140 mW)
  • Super compact and lightweight
  • Slim package for dense mounting
  • Surface mount and through-hole options
  • Notes on Using Relays

● Contact Load

If the contact load is outside the prescribed range, the contacts’ lifespan will be significantly reduced; hence, this parameter must be strictly adhered to. It is essential to remember that the demonstrated running performance is merely an example and that the actual performance may differ based on parameters such as the switching frequency, driver circuit, type of load, and ambient temperature in natural working conditions.

● Driving Relays

Suppose the internal connection diagram of a relay exhibits symbols for plus and minus on the coil. In that case, the relay should have the rated voltage applied in the provided direction. When a rippling DC source is employed, it is possible for anomalies to occur, such as heat near the coil.

The ambient temperature affects the maximum voltage that may be delivered to the relay’s coil, and this effect varies depending on the temperature. In most cases, the coil’s operational length decreases proportionally with the voltage given. It is crucial to keep in mind, however, that high voltage can also increase the bounce of the contacts as well as the contact opening and closing frequency, all of which might potentially reduce the contacts’ lifetime.

The rise and fall times of the driving voltage should be less than one millisecond (ms), ensuring constant operation.

When working with a latching relay, make sure that the polarity of the voltage that is applied to the relay’s coil matches what is shown in the relay’s internal connection diagram.

If a current is passed through the coil for an extended time, the temperature of the coil will increase. This will cause the creation of organic gas within the relay, which may cause the contacts to become defective. In this particular scenario, the utilization of a latching relay is suggested.

After the voltage has been added to or removed from the coil, the operation time and the release time reflect the amount of time that must pass before each contact can make electrical contact. However, since the relay possesses a mechanical structure, a bounce state is present after both the operating and release durations. Care must be taken when utilizing the relay at fast speeds since the contact needs more time to stabilize after high resistance. This means that using the relay too quickly can cause it to fail.

● Operating Environment

Make that the application set relay operates within the stated temperature range. If you use a relay at a temperature that is outside of this range, it may have a negative impact on the performance of the insulation or the contacts.

The relay can become saturated with moisture if utilized for an extended period in an environment with a relative humidity of 85% or higher or higher. This moisture can produce nitric or sulfuric acid when it reacts with the NOx and SOx produced by glow discharges that occur whenever the contacts are opened or closed. If this happens, the acid formed may corrode the metallic portions of the relay, resulting in a problem in its functionality.

There is a possibility that the relay will be compromised if any material that contains silicon (silicon oil, silicon rubber, or silicon-based coating material) is used in the vicinity of the relay. This is because there is a chance that the silicon-containing material will emit silicon gas that will get inside the relay. In this particular scenario, the switching contact could cause silicon compounds to form on the surface of the contacts. This silicon compound could cause the failure of the contact. When operating in such a setting, you should avoid using the relay.

● Mounting

When using an automatic chip mounter to attach a relay to a printed circuit board, if an excessive amount of force is applied to the cover of the relay when the relay is being chucked or inserted, the cover may become damaged, or the characteristics of the relay may deteriorate. Both of these outcomes are undesirable. Maintain the force delivered to the relay at no more than 1 kilogram.

Try to avoid bending the pins when temporarily securing the relay to the PC board. When the pins are bent, the sealability may be compromised, and the internal mechanism may be negatively affected.

It is recommended that ventilation take place straight after the soldering process. Because there is a chance that the relay will experience thermal shock if it is submerged in cleaning solvent right after the soldering process, you should avoid doing so.

Make use of a cleaning solvent that is either water- or alcohol-based. Never use thinner or benzene because doing so could potentially ruin the housing of the relay.

● Handling and Storage

Magazine cases are used to ship relays. After removing some relays from the case, replace the stopper to keep the remaining relays from falling out. Transporting relays might be problematic if the contacts are not correctly protected against vibration.

Please take caution when holding the relay so it doesn’t get dropped or knocked over. Do not pick up a dropped relay and utilize it. A relay may be damaged if it is dropped from a workbench and experiences a shock of 9,800 m/s2 (1,000 G) or greater. If the relay has been subjected to a mild shock, it should be carefully tested before being used.

Shipped latching relays have been reset from the factory. However, transport-related vibration or stress could trigger a latching relay. To use the relay in the set, you must reset it by hand first. Keep in mind that when used in a portable set, the relay could be triggered by sudden vibrations or shocks.

In Conclusion

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