ST2-DC3V Equivalent & Substitute Parts

Part Overview

The ST2-DC3V is a general purpose relay manufactured by Panasonic Electric Works, featuring a DPST-NO (2 Form A) contact configuration with a 3VDC coil. This through-hole mounted relay is rated for 8A switching capacity and is designed for general purpose switching applications. The product is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and legacy system support.

Substiute Parts

ST2-DC3V

Panasonic Electric WorksIn Stock: 953ST2-DC3V Datasheet

Current PartRFQ

DSP2A-DC3V

Panasonic Electric WorksIn Stock: 1202DSP2A-DC3V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST2-DC3V is determined by the following critical parameters that must remain consistent:

• Coil Voltage: 3VDC (exact match required)
• Contact Form: DPST-NO (2 Form A) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Termination Style: PC Pin (exact match required)
• Operating Temperature Range: -40°C ~ 60°C (minimum requirement)
• Must Operate/Release Voltages: 2.4 VDC / 0.3 VDC (exact match required)

The DSP2A-DC3V meets all critical substitution criteria. However, the contact rating differs: the substitute part is rated for 5A maximum switching capacity compared to the original 8A rating. This reduction in current capacity must be evaluated against the specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The DSP2A-DC3V is the designated substitute for the obsolete ST2-DC3V based on matching coil voltage, contact configuration, mounting type, and termination style. The substitute part is currently in active production status with 1172 units in stock, ensuring availability for replacement applications.

The DSP2A-DC3V carries ROHS3 compliance and maintains REACH unaffected status, meeting current regulatory requirements. Both parts share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications.

Selection of the DSP2A-DC3V requires verification that the application load does not exceed 5A continuous current, as this represents a reduction from the original 8A rating. The substitute part also operates at reduced maximum switching voltages (250VAC, 125VDC versus 380VAC, 250VDC). Applications requiring the full 8A capacity or higher switching voltages must be re-evaluated for alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the DSP2A-DC3V directly replace the ST2-DC3V in all applications?

A: The DSP2A-DC3V matches all critical electrical and mechanical parameters including coil voltage, contact form, mounting type, and termination style. However, the substitute part has a reduced current rating (5A versus 8A) and lower maximum switching voltages. Direct replacement is only suitable for applications where the load current does not exceed 5A and switching voltages remain within 250VAC or 125VDC limits.

Q: What are the key differences between these two relays?

A: The primary differences are contact current rating (8A versus 5A), maximum switching voltage capability (380VAC/250VDC versus 250VAC/125VDC), coil current draw (78.9mA versus 100mA), and switching speed (ST2-DC3V operates in 15ms/releases in 10ms; DSP2A-DC3V operates in 10ms/releases in 5ms). The DSP2A-DC3V is currently in active production while the ST2-DC3V is obsolete.

Q: Are there any packaging differences?

A: The ST2-DC3V was supplied in standard packaging, while the DSP2A-DC3V is supplied in bulk packaging. Both use identical PC pin termination for through-hole mounting on printed circuit boards.

Q: What compliance certifications apply to the substitute part?

A: The DSP2A-DC3V is ROHS3 compliant and REACH unaffected. It carries cURus and VDE approval agency certifications. Both parts share the same ECCN (EAR99) export classification.

Q: If my application requires 8A switching capacity, what should I do?

A: Applications requiring the full 8A capacity of the original ST2-DC3V cannot use the DSP2A-DC3V as a direct substitute. Alternative relay solutions with matching 3VDC coil voltage and 8A or higher current ratings must be sourced from the manufacturer's current product portfolio.