KEMET UB2-3NUN General Purpose Relay DPDT Equivalent & Substitute Parts

Part Overview

The KEMET UB2-3NUN is a general purpose relay with DPDT (2 Form C) contact configuration, rated for 1 A at 3VDC coil voltage. This surface mount relay is designed for applications requiring dual-pole, dual-throw switching functionality with non-latching operation. The part is Active in product status and ROHS3 compliant, making it suitable for modern electronic assemblies. Equivalent and substitute parts are identified to provide design flexibility, inventory alternatives, and supply chain continuity for applications with identical electrical and mechanical requirements.

Substiute Parts

UB2-3NUN

KEMETIn Stock: 780UB2-3NUN Datasheet

Current PartRFQ

UB2-3NU

KEMETIn Stock: 3421UB2-3NU Datasheet

Parametric EquivalentRFQ

UD2-3NU

KEMETIn Stock: 30463UD2-3NU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KEMET UB2-3NUN are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical:

Electrical Parameters (Must Match):

• Coil Voltage: 3VDC
• Contact Form: DPDT (2 Form C)
• Contact Rating (Current): 1 A
• Switching Voltage: 250VAC, 220VDC - Max
• Coil Current: 46.7 mA
• Coil Type: Non Latching
• Coil Resistance: 64.3 Ohms
• Must Operate Voltage: 2.25 VDC
• Must Release Voltage: 0.3 VDC
• Operate Time: 2 ms
• Release Time: 1 ms

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Termination Style: Gull Wing
• Operating Temperature Range: -40°C ~ 85°C
• Contact Material: Silver Alloy, Gold Alloy

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

All identified substitute parts meet these criteria without exception. Series designation differences (UB2 vs. UD2) do not affect substitutability when all electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UB2-3NUN, UB2-3NU, and UD2-3NU—are functionally equivalent for applications requiring a 3VDC DPDT general purpose relay with 1 A contact rating and surface mount gull wing termination. Selection among these parts is based on the following engineering considerations:

Product Status: All three parts maintain Active product status, ensuring continued manufacturer support and availability.

Compliance Certification: All parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Inventory Availability: UB2-3NUN (752 Pcs), UB2-3NU (3,364 Pcs), and UD2-3NU (30,400 Pcs) are available in stock. Selection may be influenced by required delivery quantities and lead time considerations.

Series Designation: The UB2 series (UB2-3NUN, UB2-3NU) and UD2 series (UD2-3NU) are interchangeable for this application. Series differences do not affect electrical performance or mechanical compatibility when all parameters are identical.

Packaging: All parts are supplied in tube packaging, consistent with standard relay distribution formats.

Frequently Asked Questions (FAQ)

Q: Can UB2-3NU be used as a direct replacement for UB2-3NUN?

A: Yes. UB2-3NU is a parametric equivalent with identical electrical specifications, mechanical configuration, and compliance certifications. Both parts are KEMET UB2 series relays with matching coil voltage, contact form, current rating, and operating characteristics.

Q: What is the difference between UB2-3NUN and UD2-3NU?

A: The primary difference is the series designation (UB2 vs. UD2). All electrical parameters, mechanical specifications, contact ratings, and compliance certifications are identical. Both parts are suitable for the same applications without modification.

Q: Are there any compatibility issues when substituting between these three part numbers?

A: No. All three parts share identical electrical and mechanical parameters, including coil voltage (3VDC), contact form (DPDT), current rating (1 A), mounting type (surface mount), and termination style (gull wing). Substitution is direct without circuit or layout modifications.

Q: Do these relays require any special handling or storage considerations?

A: All three parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements. Standard component storage practices apply.

Q: What is the operating voltage range for these relays?

A: The must operate voltage is 2.25 VDC and the must release voltage is 0.3 VDC. These parameters define the minimum voltage required for relay activation and the maximum voltage at which the relay releases. The nominal coil voltage is 3VDC.

Q: Are these parts suitable for high-frequency switching applications?

A: These are general purpose relays with operate time of 2 ms and release time of 1 ms. Application suitability depends on specific switching frequency requirements and load characteristics.

Q: What contact materials are used in these relays?

A: All three parts use Silver Alloy and Gold Alloy contact materials, providing reliable switching performance across the specified voltage and current ranges.