ST2-L2-DC24V Equivalent & Substitute Parts

Part Overview

The ST2-L2-DC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a DPST-NO (2 Form A) contact configuration with a 24VDC coil. This through-hole mounted relay is designed for applications requiring dual-pole, single-throw switching with an 8A contact rating. The product is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

ST2-L2-DC24V

Panasonic Electric WorksIn Stock: 1992ST2-L2-DC24V Datasheet

Current PartRFQ

DSP2A-L2-DC24V

Panasonic Electric WorksIn Stock: 6723DSP2A-L2-DC24V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST2-L2-DC24V is determined by the following critical parameters that must remain consistent:

• Coil Voltage: 24VDC (must operate at 19.2 VDC minimum)
• Contact Form: DPST-NO (2 Form A) configuration
• Mounting Type: Through Hole with PC Pin termination
• Coil Type: Latching, Dual Coil operation
• Operating Temperature Range: -40°C ~ 60°C

The DSP2A-L2-DC24V qualifies as a substitute based on matching these core parameters. However, the contact rating differs: the substitute provides 5A versus the original 8A specification. This reduction in current capacity must be evaluated against actual application requirements.

Parameter Comparison

Engineering Selection Recommendations

The DSP2A-L2-DC24V is the identified substitute for the obsolete ST2-L2-DC24V based on functional equivalence in coil voltage, contact configuration, and mounting characteristics. The substitute is currently in active production status with ROHS3 compliance and regulatory approvals (cURus, VDE), providing supply chain continuity.

Selection of the DSP2A-L2-DC24V requires evaluation of the following differences:

• Contact Current Rating: The substitute is rated for 5A versus the original 8A. Applications operating at or below 5A are directly compatible. Applications requiring the full 8A capacity require circuit redesign or alternative component selection.
• Switching Voltage: The substitute supports 250VAC and 125VDC maximum, compared to the original 380VAC and 250VDC. Verify that application switching voltages do not exceed substitute ratings.
• Contact Material: The substitute uses Silver Tin Oxide (AgSnO) versus Silver Alloy in the original. This material change affects contact wear characteristics and may influence performance in specific load conditions.
• Coil Resistance: The substitute has lower coil resistance (1.92 kOhms vs. 2.4 kOhms), resulting in higher coil current (12.5 mA vs. 10 mA). Verify that control circuits can supply the increased current.

Frequently Asked Questions (FAQ)

Q: Can the DSP2A-L2-DC24V directly replace the ST2-L2-DC24V in all applications?

A: Direct replacement is possible only when application current requirements do not exceed 5A and switching voltages remain within 250VAC/125VDC limits. Applications requiring the full 8A capacity or higher switching voltages require alternative solutions.

Q: What is the impact of the different contact materials?

A: The original ST2-L2-DC24V uses Silver Alloy contacts, while the DSP2A-L2-DC24V uses Silver Tin Oxide (AgSnO). Both materials are suitable for general purpose switching. Silver Tin Oxide provides improved resistance to contact wear in certain load profiles but may exhibit different performance characteristics in specific applications. Application-specific testing is warranted if contact longevity is critical.

Q: Are there packaging differences between these parts?

A: The ST2-L2-DC24V is specified with standard packaging, while the DSP2A-L2-DC24V is supplied in Bulk packaging. Both use identical through-hole PC pin termination and mounting footprints, ensuring mechanical compatibility on printed circuit boards.

Q: How does the increased coil current affect circuit design?

A: The DSP2A-L2-DC24V requires 12.5 mA coil current versus 10 mA for the original. Control circuits must be verified to supply this increased current. In most 24VDC control systems, this difference is negligible, but low-power or current-limited designs should be evaluated.

Q: What is the significance of the ROHS3 compliance on the substitute?

A: ROHS3 compliance indicates the DSP2A-L2-DC24V meets current environmental and hazardous substance restrictions. This is relevant for applications subject to regulatory compliance requirements or procurement policies mandating ROHS compliance.