UB2-4.5NUN General Purpose Relay DPDT Equivalent & Substitute Parts

Part Overview

The UB2-4.5NUN is a general purpose relay manufactured by KEMET, classified as a DPDT (Double Pole Double Throw, 2 Form C) surface mount component. This relay operates at 4.5VDC coil voltage with a 1A contact rating and is designed for switching applications up to 250VAC or 220VDC maximum. The component is currently in active product status with 913 pieces available in new original inventory.

Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when supply chain optimization is required, or when design flexibility allows for alternative qualified components that meet identical electrical and mechanical specifications.

Substiute Parts

UB2-4.5NUN

KEMETIn Stock: 944UB2-4.5NUN Datasheet

Current PartRFQ

UD2-4.5NU

KEMETIn Stock: 8975UD2-4.5NU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB2-4.5NUN are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Coil voltage: 4.5VDC
• Contact form: DPDT (2 Form C)
• Contact rating: 1 A
• Switching voltage: 250VAC, 220VDC - Max
• Coil current: 31 mA
• Coil type: Non Latching
• Mounting type: Surface Mount
• Termination style: Gull Wing
• Operating temperature range: -40°C ~ 85°C
• Contact material: Silver Alloy, Gold Alloy
• Coil resistance: 145 Ohms

The UD2-4.5NU qualifies as a parametric equivalent substitute because it matches all critical electrical specifications, mechanical dimensions, and environmental ratings. Both components are manufactured by KEMET and share identical functional characteristics within the relay category.

Parameter Comparison

Engineering Selection Recommendations

Both the UB2-4.5NUN and UD2-4.5NU are active products manufactured by KEMET with full ROHS3 compliance and REACH unaffected status. The components are functionally and electrically interchangeable for all applications requiring a 4.5VDC DPDT general purpose relay with 1A contact rating and surface mount gull wing termination.

Selection between these parts may be based on inventory availability. The UD2-4.5NU currently has higher inventory (8911 pieces) compared to the UB2-4.5NUN (913 pieces), which may influence procurement decisions for high-volume applications or extended lead time mitigation.

Both components operate within the -40°C to 85°C temperature range and are suitable for industrial, commercial, and consumer applications requiring non-latching relay functionality with silver alloy and gold alloy contact materials.

Frequently Asked Questions (FAQ)

Q: Can the UD2-4.5NU be used as a direct replacement for the UB2-4.5NUN in existing designs?

A: Yes. The UD2-4.5NU is a parametric equivalent with identical electrical specifications, coil voltage, contact form, current rating, switching voltage, and mechanical mounting characteristics. No circuit modifications are required.

Q: Are there differences in the series designation between UB2 and UD2?

A: The series designation differs (UB2 versus UD2), but this reflects internal KEMET product line organization. Both series share identical electrical and mechanical parameters for this specific coil voltage and contact configuration.

Q: What are the key parameters that must match for substitution?

A: Critical matching parameters include coil voltage (4.5VDC), contact form (DPDT), contact rating (1A), switching voltage (250VAC/220VDC max), coil current (31mA), mounting type (surface mount), termination style (gull wing), and operating temperature range (-40°C to 85°C).

Q: Are both parts suitable for PCB assembly with standard surface mount equipment?

A: Yes. Both components feature gull wing termination and surface mount packaging, compatible with standard pick-and-place and reflow soldering processes.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the UB2-4.5NUN and UD2-4.5NU are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8536.41.0020).

Q: What is the moisture sensitivity level for these relays?

A: Both components have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.