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

Part Overview

The KEMET UB2-3NUN-L 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 currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design flexibility permits selection from functionally identical alternatives within the same product family.

Substiute Parts

UB2-3NUN-L

KEMETIn Stock: 1344UB2-3NUN-L Datasheet

Current PartRFQ

EB2-3NU-L

KEMETIn Stock: 65012EB2-3NU-L Datasheet

Parametric EquivalentRFQ

UD2-3NU-L

KEMETIn Stock: 3255UD2-3NU-L Datasheet

Parametric EquivalentRFQ

UD2-3NUN-L

KEMETIn Stock: 2085UD2-3NUN-L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KEMET UB2-3NUN-L is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must match identically for a part to function as a direct substitute:

Critical Matching Parameters:

• Coil Voltage: 3VDC
• Contact Form: DPDT (2 Form C)
• Contact Rating: 1 A
• Switching Voltage: 250VAC, 220VDC - Max
• Coil Current: 46.7 mA
• Coil Resistance: 64.3 Ohms
• Mounting Type: Surface Mount
• Termination Style: Gull Wing
• Operate Time: 2 ms
• Release Time: 1 ms
• Must Operate Voltage: 2.25 VDC
• Must Release Voltage: 0.3 VDC
• Operating Temperature Range: -40°C ~ 85°C
• Contact Material: Silver Alloy, Gold Alloy
• Coil Type: Non Latching

Variable Parameters (Packaging): Packaging format (Cut Tape, Tape & Reel, Digi-Reel) may differ between equivalent parts without affecting electrical or mechanical function. Series designation may vary (UB2, UD2, EB2) provided all electrical specifications remain identical.

All identified substitute parts maintain complete parametric equivalence with the main part number UB2-3NUN-L across all critical specifications.

Parameter Comparison

Engineering Selection Recommendations

All four part numbers (UB2-3NUN-L, EB2-3NU-L, UD2-3NU-L, UD2-3NUN-L) are functionally equivalent and maintain identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

Packaging Format Considerations:

• Cut Tape (CT): UB2-3NUN-L and UD2-3NUN-L are supplied in cut tape format, suitable for manual assembly or small-batch production environments.
• Tape & Reel (TR): UD2-3NU-L is supplied in tape and reel format, optimized for high-volume automated assembly processes.
• Digi-Reel® Option: EB2-3NU-L offers both cut tape and Digi-Reel® packaging, providing flexibility for mixed production volumes.

Inventory Availability:

• EB2-3NU-L: 64,940 pcs in stock (highest availability)
• UB2-3NUN-L: 1,292 pcs in stock
• UD2-3NU-L: 3,209 pcs in stock
• UD2-3NUN-L: 2,000 pcs in stock

Regulatory Compliance: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8536.41.0020. No compliance differentiation exists between the four options.

Series Selection: UB2, UD2, and EB2 series designations reflect internal KEMET product line organization. From an engineering perspective, all three series maintain identical performance characteristics for this specific part configuration.

Frequently Asked Questions (FAQ)

Q: Can EB2-3NU-L be used as a direct replacement for UB2-3NUN-L in existing designs?

A: Yes. The EB2-3NU-L maintains complete parametric equivalence with UB2-3NUN-L across all electrical and mechanical specifications. The only difference is packaging format and series designation, which do not affect functional performance. PCB footprints and circuit behavior remain identical.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging supplies individual relay units on tape segments, suitable for manual pick-and-place or small-quantity assembly. Tape & Reel (TR) packaging supplies relays on continuous reels, optimized for automated high-speed assembly equipment. Both formats contain identical components with identical specifications.

Q: Does the Digi-Reel® option from EB2-3NU-L offer any technical advantage?

A: No technical advantage exists. Digi-Reel® is a packaging format option that provides flexibility for customers with mixed production volumes. The relay component itself is electrically and mechanically identical to other packaging options.

Q: Are all four part numbers suitable for the same operating temperature range?

A: Yes. All four parts operate identically across the -40°C to 85°C temperature range with identical switching characteristics and reliability at all temperatures within this range.

Q: Can these relays be used interchangeably in high-volume automated assembly?

A: UD2-3NU-L in Tape & Reel format is optimized for automated assembly. However, EB2-3NU-L with Digi-Reel® option also supports automated processes. Cut Tape versions (UB2-3NUN-L, UD2-3NUN-L) are less efficient for high-volume automation but remain functionally equivalent.

Q: What determines the choice between UB2, UD2, and EB2 series?

A: Series designation reflects KEMET's internal product line organization and does not affect electrical or mechanical performance. Selection should be based on packaging availability, inventory levels, and supply chain requirements rather than technical specifications.

Q: Are there any differences in contact material between the four part numbers?

A: No. All four parts use identical Silver Alloy and Gold Alloy contact materials, ensuring equivalent contact reliability and switching performance.

Q: Can these relays handle the same maximum switching voltage?

A: Yes. All four parts are rated for 250VAC and 220VDC maximum switching voltage with identical contact ratings of 1 A.

Q: What is the significance of the 2.25 VDC Must Operate Voltage specification?

A: This specification indicates the minimum coil voltage required to guarantee relay activation. All four parts require 2.25 VDC minimum for reliable operation, ensuring consistent performance across the entire substitute group.