USRUC20300NU00

Miniature Signal Relays **UC2/UD2** 

## **Overview** 

## **Applications** 

The KEMET UC2/UD2 miniature signal relays offer a super compact case size in a flat package. Minimal board space is consumed with either a through-hole or surface mount configuration. These relays are recognized by UL and CSA, while also being compliant with Part 68 of the FCC’s 1,500 V surge capacity. 

- Electronic switching systems 

- PBX 

- Terminal equipment 

- Telephone systems 

## **Benefits** 

- Low power consumption (< 140 mW) 

- Super compact and lightweight 

- Slim package for dense mounting 

- Low magnetic interference 

- Tube or embossed tape and reel packaging 

- UL recognized (E73266) and CSA certified (LR46266) 

- Surface mount and through-hole options 

## **Part Number System** 

|**UD2-**|**3**|**S**|**NU**|**-L**|
|---|---|---|---|---|
|Series|Coil Voltage|Latch Type|Lead Type|Packaging|
|UC2- = Through-hole mount<br>UD2- = Surface mount|3 = 3 VDC<br>4.5 = 4.5 VDC<br>5 = 5 VDC<br>9 = 9 VDC<br>12 = 12 VDC|Blank = Non-latch type<br>S = Single coil latch type|NU = Standard<br>NE = Low power consumption (Non-latch)<br>NJ = Trimmed<br>NUN = Minimum footprint<br>NEN = Low power consumption (Non-latch),<br>Minimum footprint|Blank = Tube<br>-L = Embossed tape on reel<br>NU, NUN:<br>L8 = Embossed carrying<br>tape and Moisture barrier<br>bag, Humidity Indicator<br>Card. MSL 4<br>NE, NEN:<br>L9 = Embossed carrying<br>tape and Moisture barrier<br>bag, Humidity Indicator<br>Card. MSL 2a|



~~Cs~~ **Built Into Tomorrow** 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

1 

Miniature Signal Relays – UC2/UD2 

## **Dimensions – Millimeters** 

## **UC2 Series** 

**==> picture [293 x 122] intentionally omitted <==**

**----- Start of picture text -----**<br>
D B<br>H<br>0.4 K 0.2<br>1.5 1.5<br>3.2 P P P<br>1 1 2<br>**----- End of picture text -----**<br>


## **UD2 Series** 

**==> picture [300 x 109] intentionally omitted <==**

**----- Start of picture text -----**<br>
D B<br>K H Maximum<br>0.4 0.2<br>P<br>1.5 1.5 2<br>3.2 P1 P1 P3<br>**----- End of picture text -----**<br>


**==> picture [398 x 79] intentionally omitted <==**

**----- Start of picture text -----**<br>
Series D H B P P P K<br>1 2 3<br>UC2 (NU, NE) 10.6 5.3 6.5 2.2 5.08 — 3.4<br>UC2 (NJ) 10.6 5.3 6.5 2.2 5.08 — 2.8<br>UD2 (NU, NE) 10.6 5.45 6.5 2.2 5.08 8.4 0.25<br>UD2 (NUN, NEN) 10.6 6.0 6.5 2.2 5.08 6.8 0.6<br>**----- End of picture text -----**<br>


_General tolerance: ±0.3 Tolerance of lead pitch: ±0.15_ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

2 

Miniature Signal Relays – UC2/UD2 

## **Pin Configurations** 

## **Bottom view** 

**==> picture [298 x 151] intentionally omitted <==**

**----- Start of picture text -----**<br>
Non-latch type Single coil latch type<br>(Non-energized position) (Reset position)<br>1      2    3    4 1      2    3    4<br>+  +  -<br>S R<br>- - +<br>8       7   6    5  8       7   6    5<br>S: Coil polarity for Set<br>R: Coil polarity for Reset<br>Direction mark Direction mark<br>**----- End of picture text -----**<br>


## **Safety Standards and Ratings** 

|**Certification Body**<br>~~rs~~|**Mark**<br>~~es~~|**Specification**<br>~~es~~<br>~~Qe~~|**File Number**<br>~~Qe~~|**Rating**|
|---|---|---|---|---|
|UL<br>~~rs ~~|~~es~~<br>AX|UL Recognized<br>(UL508)1<br>~~es~~<br>~~Qe~~|E73266<br>~~Qe~~|30 VDC, 1 A (resistive)<br>110 VDC, 0.3 A (resistive)<br>125 VAC, 0.5 A (resistive)|
|CSA|@~~,~~|CSA Certified<br>(CSA 22.2 #14)2|LR46266||



_1 Spacing: UL840_ 

_2 Spacing: CSA std950_ 

|**Certification Body**<br>~~PO~~|**Mark**|**Specification**|**File Number**|**Class**|**Rating**|
|---|---|---|---|---|---|
|TUV<br>~~PO~~||TUV Certified<br>(EN61810-1)|2050596|Basic insulation|Creepage and clearance of coil to<br>contact is more than 2 mm<br>(Accordingto EN62368-1)|



## **Environmental Compliance** 

All KEMET relays are RoHS Compliant. 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

3 

Miniature Signal Relays – UC2/UD2 

## **Table 1 – Ratings & Part Number Reference** 

**==> picture [543 x 442] intentionally omitted <==**

**----- Start of picture text -----**<br>
Part Number Nominal Coil Voltage<br>Lead Type Packaging<br>() Designates Latch Type (VDC)<br>UC2-3(1)NU 3.0 Radial Tube<br>UC2-4.5(1)NU 4.5 Radial Tube<br>UC2-5(1)NU 5.0 Radial Tube<br>UC2-12(1)NU 12.0 Radial Tube<br>UC2-3(1)NJ 3.0 Radial Tube<br>UC2-4.5(1)NJ 4.5 Radial Tube<br>UC2-5(1)NJ 5.0 Radial Tube<br>UC2-9(1)NJ 9.0 Radial Tube<br>UC2-12(1)NJ 12.0 Radial Tube<br>UC2-3NE [1] 3.0 Radial, Low power consumption Tube<br>UC2-4.5NE [1] 4.5 Radial, Low power consumption Tube<br>UC2-5NE [1] 5.0 Radial, Low power consumption Tube<br>UD2-3(1)NU 3.0 Surface mount Tube<br>UD2-4.5(1)NU 4.5 Surface mount Tube<br>UD2-5(1)NU 5.0 Surface mount Tube<br>UD2-12(1)NU 12.0 Surface mount Tube<br>UD2-3NE [1] 3.0 Surface mount, Low power consumption Tube<br>UD2-4.5NE [1] 4.5 Surface mount, Low power consumption Tube<br>UD2-5NE [1] 5.0 Surface mount, Low power consumption Tube<br>UD2-3(1)NU-L 3.0 Surface mount Tape on Reel<br>UD2-4.5(1)NU-L 4.5 Surface mount Tape on Reel<br>UD2-5(1)NU-L 5.0 Surface mount Tape on Reel<br>UD2-12(1)NU-L 12.0 Surface mount Tape on Reel<br>UD2-3NE-L [1] 3.0 Surface mount, Low power consumption Tape on Reel<br>UD2-4.5NE-L [1] 4.5 Surface mount, Low power consumption Tape on Reel<br>UD2-5NE-L [1] 5.0 Surface mount, Low power consumption Tape on Reel<br>UD2-3(1)NUN 3.0 Surface mount, Minimum footprint Tube<br>UD2-4.5(1)NUN 4.5 Surface mount, Minimum footprint Tube<br>UD2-5(1)NUN 5.0 Surface mount, Minimum footprint Tube<br>UD2-12(1)NUN 12.0 Surface mount, Minimum footprint Tube<br>UD2-3NEN [1] 3.0 Surface mount, Low power consumption, Minimum Footprint Tube<br>UD2-4.5NEN [1] 4.5 Surface mount, Low power consumption, Minimum Footprint Tube<br>UD2-5NEN [1] 5.0 Surface mount, Low power consumption, Minimum Footprint Tube<br>UD2-3(1)NUN-L 3.0 Surface mount, Minimum footprint Tape on Reel<br>UD2-4.5(1)NUN-L 4.5 Surface mount, Minimum footprint Tape on Reel<br>UD2-5(1)NUN-L 5.0 Surface mount, Minimum footprint Tape on Reel<br>UD2-12(1)NUN-L 12.0 Surface mount, Minimum footprint Tape on Reel<br>UD2-3NEN-L [1] 3.0 Surface mount, Low power consumption, Minimum Footprint Tape on Reel<br>UD2-4.5NEN-L [1] 4.5 Surface mount, Low power consumption, Minimum Footprint Tape on Reel<br>UD2-5NEN-L [1] 5.0 Surface mount, Low power consumption, Minimum Footprint Tape on Reel<br>Part Number Nominal Coil Voltage Lead Type Packaging<br>**----- End of picture text -----**<br>


_(1) To complete KEMET part number, leave blank for Non-latch or insert S for Single coil. Designates latch type._ 

_1 Only available as Non-latch._ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

4 

Miniature Signal Relays – UC2/UD2 

## **Land Pattern – Millimeters** 

## **UC2 Series (bottom view)** 

**==> picture [179 x 285] intentionally omitted <==**

**----- Start of picture text -----**<br>
7.6<br>1.5 1.5<br>3.2 2.2 2.2 8 - ø 0.85<br>V<br>7.6<br>1.5 1.5<br>3.2 2.2 2.2<br>V<br>X<br>0.8<br>**----- End of picture text -----**<br>


## **UD2 Series (top view)** 

**==> picture [272 x 59] intentionally omitted <==**

**----- Start of picture text -----**<br>
Series V X<br>UC2 (NU, NE, NJ) 5.08 —<br>UD2 (NU, NE) 6.74 1.86<br>UD2 (NUN, NEN) 5.94 2.66<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

5 

Miniature Signal Relays – UC2/UD2 

## **Soldering Process** 

## **UC2 – Through-hole Mounting** 

## Automatic Soldering 

   - Preheating: 110–120°C/110 seconds (maximum) 

   - Solder temperature: 260°C maximum 

   - Solder time: 5 seconds maximum 

- _Note: KEMET recommends cooling down a printed circuit board to less than 110°C within 40 seconds after soldering._ 

- Manual Soldering 

   - Solder temperature: 350°C maximum 

   - Solder time: 3 seconds maximum 

## **UD2 – Surface Mounting** 

**==> picture [242 x 176] intentionally omitted <==**

**----- Start of picture text -----**<br>
IRS Method<br>Temperature<br>(˚C) Maximum 240˚C<br>220<br>200<br>180<br>45 (Maximum 70) Time (seconds)<br>70 (Maximum 120)<br>t h<br>190 (Maximum 300)<br>**----- End of picture text -----**<br>


_Note: Temperature profile shows printed circuit board surface temperature on the relay terminal portion. Please consult KEMET if you wish to use a temperature profile other than above._ 

## **UD2 – Surface Mounting (L8 packaging only)** 

## IRS Method (JEDEC compliant profile) 

_Note: Temperature profile shows body (cover) temperature. To comply with this 250°C classification temperature, MSL 4 control is absolutely necessary._ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

6 

Miniature Signal Relays – UC2/UD2 

## **Contact Specifications** 

**==> picture [542 x 26] intentionally omitted <==**

**----- Start of picture text -----**<br>
Item UC2/UD2<br>**----- End of picture text -----**<br>


|**Item**|**Item**|**UC2/UD2**|
|---|---|---|
||||
|Contact Form||2 Form C|
|Contact Material||Silver alloy with gold alloy overlay|
|Contact Ratings|Maximum Switching Power|30 W, 37.5 VA|
||Maximum Switching Voltage|220 VDC, 250 VAC|
||Maximum Switching Current|1 A|
||Maximum Carrying Current|1 A|
|Minimum Contact Ratings||10 mVDC, 10 µA*1|
|Initial Contact Resistance||100 mΩ maximum(initial)|
|Operating Time (excluding bounce)||Approximately 2 milliseconds|
|Release Time (excluding bounce)||Approximately 1 milliseconds|
|Insulation Resistance||1,000 MΩ at 500 VDC|
|Withstand Voltage|Between Open Contacts|1,000 VAC (for one minute), 1,500 V surge (10 x 160 µs)*2|
||Between Adjacent Contacts|1,000 VAC (for one minute), 1,500 V surge (10 x 160 µs)*2|
||Between Coil and Contacts|1,800 VAC (for one minute), 2,500 V surge (2 x 10 µs)*3|
|Shock Resistance||735 m/s2(75 G) – misoperation<br>980 m/s2(100 G) – destructive failure|
|Vibration Resistance||10 to 55 Hz, double amplitude 3 mm (20 G) – misoperation<br>10 to 55 Hz, double amplitude 5 mm(30 G)– destructive failure|
|Ambient Temperature||−40 to +85°C|
|||−40 to +70°C(Low power consumption type)|
|Coil Temperature Rise||18°C at nominal coil voltage (140 mW)|
|Running Specifcations|Non-load|5 x 107operations (Non-latch type)*4<br>1 x 107operations (Latch type)|
||Load|30 VDC 1 A (resistive), 1 x 105operations at 20°C, 1 Hz<br>125 VAC 0.3 A (resistive), 1 x 105operations at 20°C, 1 Hz|
|Weight||Approximately 0.8 g|



- _*1 This value is a reference value in the resistance load. Minimum capacity changes depending on the switching frequency, environment temperature, and 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 x 107 operations._ 

## **Coil Specifications** 

|**Non-latch Type (at 20°C)**|**Non-latch Type (at 20°C)**|**Non-latch Type (at 20°C)**|**Non-latch Type (at 20°C)**|**Non-latch Type (at 20°C)**|
|---|---|---|---|---|
|**Nominal Coil Voltage**<br>**(VDC)**|**Coil Resistance**<br>**(Ω) ±10%**|**Operating Voltage1**<br>**(VDC)**|**Release Voltage1**<br>**(VDC)**|**Nominal Operating**<br>**Power (mW)**|
|3.0|64.3|2.25|0.30|140|
|4.5|145.0|3.38|0.45|140|
|5.0|178.0|3.75|0.50|140|
|9.0|579.0|6.75|0.90|140|
|12.0|1028.0|9.00|1.20|140|



_1 Test by pulse voltage._ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

7 

Miniature Signal Relays – UC2/UD2 

## **Coil Specifications cont.** 

|**Single Coil Latch Type (at 20°C)2**|**Single Coil Latch Type (at 20°C)2**|**Single Coil Latch Type (at 20°C)2**|**Single Coil Latch Type (at 20°C)2**|**Single Coil Latch Type (at 20°C)2**|
|---|---|---|---|---|
|**Nominal Coil Voltage**<br>**(VDC)**|**Coil Resistance**<br>**(Ω) ±10%**|**Set Voltage1**<br>**(VDC)**|**Reset Voltage1**<br>**(VDC)**|**Nominal Operating**<br>**Power (mW)**|
|3.0|90.0|2.25|2.25|100|
|4.5|202.5|3.38|3.38|100|
|5.0|250.0|3.75|3.75|100|
|9.0|810.0|6.75|6.75|100|
|12.0|1440.0|9.00|9.00|100|



_1 Test by pulse voltage._ 

_2 Latch type relays should be initialized to a known position before using. Only the specified polarity should be used to energize the coil._ 

|**Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)**|**Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)**|**Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)**|**Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)**|**Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)**|
|---|---|---|---|---|
|**Nominal Coil Voltage**<br>**(VDC)**|**Coil Resistance**<br>**(Ω) ±10%**|**Operating Voltage1**<br>**(VDC)**|**Release Voltage1**<br>**(VDC)**|**Nominal Operating**<br>**Power (mW)**|
|3.0|90.0|2.40|0.30|100|
|4.5|202.5|3.60|0.45|100|
|5.0|250.0|4.00|0.50|100|



_1 Test by pulse voltage._ 

## **Recommended Relay Drive Conditions** 

|**Coil Type**|**Rating**|**Ambient Temperature**|
|---|---|---|
|Non-latch|Voltage: ≤ ±5% of nominal voltage|−40 to +85°C|
|Non-latch(Lowpower consumption type)||−40 to +70°C|
|Single Coil latch|Square pulse (rise and fall time is rapid)<br>Pulse height: ≤ ±5% of nominal voltage<br>Pulse Width: > 10 ms|−40 to +85°C|



## **Marking** 

## **Top view** 

Part Number Date Code Direction Mark ~~|~~[UC2-5NU] | 1A1727F-<—— (Pin No. 1 and 8) meen JAPAN=— Country of Origin Manufacturer 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

8 

Miniature Signal Relays – UC2/UD2 

## **Performance Data** 

## **Coil Temperature Rise** 

Temperature is measured by coil resistance 

## **Switching Capacity** 

Maximum Values 

## **Maximum Coil Voltage** 

Maximum value of permissible alteration 

## **Applied Voltage vs. Timing** (Sample: UC2–5NU) 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

9 

Miniature Signal Relays – UC2/UD2 

## **Performance Data cont.** 

## **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 higher than this value for safe operation. For hot start operation, please inquire with KEMET. 

## **Running Test (Non-load)** 

(Load: none; Drive: 5 VDC, 50 Hz, 50% duty; Ambient Temperature: room temperature; Sample: UC2–5NU, 20 pieces) 

## **Running Test (Load)** 

(Load: 50 VDC, 0.1 A resistive; Drive: 5 VDC, 5 Hz, 50% duty; Ambient Temperature: 85°C; Sample: UC2–5NU, 10 pieces) 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

10 

Miniature Signal Relays – UC2/UD2 

## **Performance Data cont.** 

## **Breakdown Voltage** 

## (Sample: UC2–5NU, 10 pieces) 

_Note: Applying 2.8 kV or more may cause of breakdown outside U series relay (between terminals)._ 

## **Alteration of Voltage in Dense Mounting** (magnetic interference) 

## **Mounting Layout** 

**==> picture [363 x 155] intentionally omitted <==**

**----- Start of picture text -----**<br>
Device under test  ON OFF<br>ON        ON OFF       OFF<br>3mm 2.5mm<br>ON OFF<br> a               b                      c           d<br>ON<br>OFF<br>ON<br>OFF<br>ON<br>OFF<br>e                        f<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

11 

Miniature Signal Relays – UC2/UD2 

## **Tube Packing – Millimeters** 

**==> picture [422 x 120] intentionally omitted <==**

**----- Start of picture text -----**<br>
50 pieces/Tube (anti-static)<br>12.1<br>tl ><br>11.0 560<br>Direction of relay direction mark<br>Rubber stopper (Yellow) Rubber stopper (Green)<br>~ Te ae<br>**----- End of picture text -----**<br>


## **Tape & Reel Packaging Information (UD2 - L Packaging Only) – Millimeters** 

**==> picture [293 x 265] intentionally omitted <==**

**----- Start of picture text -----**<br>
Appearance<br>Reel 1,200 pieces/Reel<br>Reel diameter: 380mm<br>Emboss<br>Carrying tape<br>a<br>Top cover tape<br>max. 8.1<br>Tape Dimensions A<br>2.0 1.75 0.4<br>Φ 1.5  1 26 4<br>Φ 2.2<br>11.5<br>14.711.4<br>24.0<br>12.1B<br>**----- End of picture text -----**<br>


|**Series**|**A**|**B**|
|---|---|---|
|NU-L,NE-L|Maximum 6.2|9.2|
|NUN-L,NEN-L|Maximum 6.6|7.5|



## **Relay Direction Mark and Tape Carrying Direction** 

**==> picture [45 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
Sprocket hole<br>**----- End of picture text -----**<br>


**==> picture [48 x 7] intentionally omitted <==**

**----- Start of picture text -----**<br>
Direction mark<br>**----- End of picture text -----**<br>


~~Oe~~ **Direction of unreeling** 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

12 

Miniature Signal Relays – UC2/UD2 

## **Tape & Reel Packaging Information (UD2 - L8, L9 Packaging Only) – Millimeters** 

## **Appearance** 

1,100 pieces/ Reel Reel Diameter: 380mm 

## **Tape Dimensions** 

**==> picture [272 x 127] intentionally omitted <==**

**----- Start of picture text -----**<br>
max. 8.1<br>A<br>2.0 1.75 0.4<br>Φ 1.5  1 62 4<br>Φ 2.2<br>11.5<br>14.711.4<br>24.0<br>12.1B<br>**----- End of picture text -----**<br>


|**Series**|**A**|**B**|
|---|---|---|
|NU-L8,NE-L9|Maximum 6.2|9.2|
|NUN-L8,NEN-L9|Maximum 6.6|7.5|



## **Relay Direction Mark and Tape Carrying Direction** 

**==> picture [255 x 136] intentionally omitted <==**

**----- Start of picture text -----**<br>
Sprocket hole<br>Direction mark<br>Direction of unreeling<br>**----- End of picture text -----**<br>


© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

13 

Miniature Signal Relays – UC2/UD2 

## **Notes on Using Relays** 

## **1. 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. 

## **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 heat 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 high voltage also increases the bounce of the contacts and the contact opening and closing frequency, which may shorten the lifetime of the contacts. 

**==> picture [170 x 81] intentionally omitted <==**

**----- Start of picture text -----**<br>
Nominal<br>coil voltage<br>0<br><1msec. <1msec.<br>**----- End of picture text -----**<br>


- For consistent operation, the driving voltage should have rise and fall times of less than 1 ms. 

- 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. 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

14 

Miniature Signal Relays – UC2/UD2 

## **Notes on Using Relays cont.** 

- 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. 

**==> picture [204 x 111] intentionally omitted <==**

**----- Start of picture text -----**<br>
85<br>80<br>60<br>Humidity<br> (%RH) 40<br>20<br>5<br>-60  -40  -20  0  20  40   60   80  100<br>Temperature (°C )<br>**----- End of picture text -----**<br>


- 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. 

- 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. 

- 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. 

## **4. Mounting** 

- 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. 

- 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. 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

15 

Miniature Signal Relays – UC2/UD2 

## **Notes on Using Relays cont.** 

## **5. Handling and Storage** 

- 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/s[2] (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 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 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). Recommend using the product as soon as possible. If the relays have moisture absorption, dehumidify as follows: – Tape Packaging: 50 ±5°C, 300 hours or more. 

      - Simple Relay: 85 ±5°C, 48 hours. 

   2. For MBB packing, please use relays within 12 months after delivery (storage conditions: 30°C/60% RH). After opening MBB packing, please use within the time limit indicated on the caution label (storage conditions: 30°C/60% RH). 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 16 

Miniature Signal Relays – UC2/UD2 

## 

## **Disclaimer** 

YAGEO Corporation and its affi  liates do not recommend the use of commercial or automotive grade products for high reliability applications or manned space fl ight. 

All product specifi cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied. 

Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such applications, but are not intended to constitute – and KEMET specifi cally disclaims – any warranty concerning suitability for a specifi c customer application or use. The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no obligation or liability for the advice given or results obtained. 

Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards (such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or property damage. 

Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicated or that other measures may not be required. 

KEMET requires its products to be packaged and shipped on pallets. This is because KEMET’s products are specifi cally designed to be packed onto pallets during shipment. If for any reason, the products are removed from pallets by the shipping party and shipped to the end customer, then additional external protection is required. In this instance, an external box with two carton layers and an upwards orientation sticker must be used by the shipping party, with the empty space fi lled with fi lling material, and afterwards sealing the box. If this packing and packaging guideline is not followed by the shipping party, the shipping party, and not KEMET, will be held responsible for any packaging, packing and/or product damages upon delivery of the products to the end customer. KEMET hereby disclaims any liability for damages to the products or otherwise that have been, or threaten to be, infl icted, result from or are in any way related to the packaging, packing or damage by the shipping party in contravention of the packing and packaging guidelines herein. 

_KEMET is a registered trademark of KEMET Electronics Corporation._ 

© KEMET Electronics Corporation • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 

R7005_UC2_UD2 • 1/3/2025 

17