KEMET UC2-3NJ General Purpose Relay DPDT 1A 3V Equivalent & Substitute Parts

Part Overview

The KEMET UC2-3NJ is an active general purpose relay with DPDT (Double Pole Double Throw) contact configuration rated for 1A at 3VDC coil voltage. This through-hole mounted relay is designed for applications requiring non-latching switching control across 250VAC and 220VDC maximum switching voltages. The UC2-3NJ is ROHS3 compliant and REACH unaffected, making it suitable for regulated electronic assemblies. Substitute parts are identified based on identical electrical performance parameters and mechanical compatibility within the general purpose relay category.

Substiute Parts

UC2-3NJ

KEMETIn Stock: 739UC2-3NJ Datasheet

Current PartRFQ

UA2-3NU

KEMETIn Stock: 2782UA2-3NU Datasheet

Parametric EquivalentRFQ

UC2-3NU

KEMETIn Stock: 1752UC2-3NU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UC2-3NJ are identified through 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:

• Coil voltage: 3VDC
• Contact form: DPDT (2 Form C)
• Contact rating: 1 A
• Switching voltage: 250VAC, 220VDC maximum
• Coil current: 46.7 mA
• 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:

• Mounting type: Through Hole
• Termination style: PC Pin
• Contact material: Silver Alloy, Gold Alloy

Environmental & Compliance Parameters:

• Operating temperature: -40°C ~ 85°C
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

The UC2-3NJ, UC2-3NU, and UA2-3NU are all general purpose relays manufactured by KEMET that meet these identical specifications. Differences exist only in series designation and packaging format.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UC2-3NJ, UC2-3NU, and UA2-3NU—are active products from KEMET with identical electrical and mechanical specifications. Selection between these parts is determined by packaging and availability requirements rather than functional performance.

UC2-3NJ is supplied in bulk packaging and is suitable for high-volume manufacturing environments where individual component handling is standard practice.

UC2-3NU is supplied in tube packaging and maintains the UC2 series designation. This packaging format provides organized component storage and is compatible with automated pick-and-place assembly systems.

UA2-3NU is supplied in tube packaging under the UA2 series designation. This part provides an alternative series option while maintaining identical electrical performance and mechanical compatibility.

All three parts meet ROHS3 compliance requirements and REACH unaffected status, making them suitable for regulated applications. The choice between UC2 and UA2 series designations does not affect functional performance in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can UC2-3NU be used as a direct replacement for UC2-3NJ?

A: Yes. Both parts are identical in all electrical parameters, contact configuration, coil voltage, current rating, switching voltage, timing characteristics, and operating temperature range. The difference is packaging format: UC2-3NJ is supplied in bulk, while UC2-3NU is supplied in tube packaging.

Q: What is the difference between UC2 and UA2 series relays?

A: The UC2 and UA2 series are both general purpose DPDT relays manufactured by KEMET with identical electrical specifications and performance characteristics. The series designation reflects internal product line organization but does not affect functional compatibility or electrical performance in circuit applications.

Q: Are all three parts suitable for the same circuit application?

A: Yes. UC2-3NJ, UC2-3NU, and UA2-3NU are electrically and mechanically equivalent. All three parts operate at 3VDC coil voltage, switch 1A at 250VAC or 220VDC maximum, and provide identical timing and temperature performance. Selection is based on packaging availability and supply chain requirements.

Q: Does packaging format affect electrical performance?

A: No. Bulk and tube packaging formats do not affect electrical performance, coil resistance, switching characteristics, or contact ratings. Packaging selection is determined by assembly process requirements and component handling procedures.

Q: Are these relays compliant with environmental regulations?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for electronic components.

Q: What is the coil resistance specification, and why is it important?

A: The coil resistance is 64.3 Ohms for all three parts. This specification determines the coil current draw at the rated 3VDC voltage (46.7 mA) and is critical for power supply design and circuit current calculations.

Q: Can these relays operate below 2.25 VDC?

A: No. The must operate voltage is specified as 2.25 VDC. Operation below this voltage does not guarantee relay activation. The must release voltage is 0.3 VDC, meaning the relay releases when coil voltage drops below this threshold.