S2S3RP Equivalent & Substitute Parts

Part Overview

The S2S3RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200 V off-state voltage and 800 mA RMS current, manufactured by Littelfuse Inc. in a surface mount DO-214AA (Compak) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The S2S3RP remains available in inventory (943 pcs), but substitutes with higher voltage ratings and active product status are available to support long-term supply chain continuity.

Substiute Parts

S2S3RP

Littelfuse Inc.In Stock: 960S2S3RP Datasheet

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S4S3RP

Littelfuse Inc.In Stock: 783S4S3RP Datasheet

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S6S3RP

Littelfuse Inc.In Stock: 800S6S3RP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the S2S3RP is determined by strict equivalence in the following parameters:

• SCR Type: Sensitive Gate (required match)
• Voltage - Gate Trigger (Vgt) (Max): 800 mV (required match)
• Current - Gate Trigger (Igt) (Max): 500 µA (required match)
• Voltage - On State (Vtm) (Max): 1.7 V (required match)
• Current - On State (It (RMS)) (Max): 800 mA (required match)
• Current - Hold (Ih) (Max): 8 mA (required match)
• Operating Temperature: -40°C ~ 110°C (required match)
• Mounting Type: Surface Mount (required match)
• Package / Case: DO-214AA, SMB (3 Leads), Compak (required match)

The substitute parts S4S3RP and S6S3RP maintain identical gate trigger characteristics, on-state voltage, holding current, and thermal operating range. The primary difference is the off-state voltage rating: S4S3RP provides 400 V and S6S3RP provides 600 V, both exceeding the 200 V specification of the S2S3RP. These higher voltage ratings provide design margin for applications requiring increased voltage withstand capability while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both S4S3RP and S6S3RP are direct functional equivalents to the S2S3RP with active product status from Littelfuse Inc. Selection between these substitutes depends on application voltage requirements:

• S4S3RP (400 V rating) is suitable for applications where the S2S3RP 200 V specification is adequate, providing a 2× voltage margin.
• S6S3RP (600 V rating) is suitable for applications requiring maximum voltage withstand capability, providing a 3× voltage margin.

All three parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. The S4S3RP and S6S3RP are available in Tape & Reel (TR) packaging, supporting automated assembly processes. The S2S3RP obsolete status necessitates transition to either substitute for new production and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can S4S3RP or S6S3RP directly replace S2S3RP in existing designs?

A: Yes. Both substitutes maintain identical gate trigger voltage (800 mV), gate trigger current (500 µA), on-state voltage (1.7 V), RMS current rating (800 mA), holding current (8 mA), operating temperature range (-40°C ~ 110°C), and package configuration (DO-214AA Compak). The higher off-state voltage ratings (400 V and 600 V respectively) are backward compatible with applications designed for 200 V operation.

Q: What is the difference between S4S3RP and S6S3RP?

A: The primary difference is off-state voltage rating. S4S3RP is rated for 400 V and S6S3RP for 600 V. All other electrical characteristics and package specifications are identical. Selection depends on the maximum voltage the application will encounter.

Q: Are the substitute parts available in the same packaging as S2S3RP?

A: Yes. All three parts use the same DO-214AA (SMB, 3 Leads) Compak surface mount package. S4S3RP and S6S3RP are supplied in Tape & Reel (TR) format, which is standard for automated assembly.

Q: Do the substitute parts meet the same compliance standards as S2S3RP?

A: Yes. S4S3RP and S6S3RP are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the S2S3RP specifications. S4S3RP and S6S3RP also carry REACH Unaffected status.

Q: Why is S2S3RP obsolete?

A: The S2S3RP is classified as obsolete by Littelfuse Inc. The active substitute parts S4S3RP and S6S3RP provide equivalent functionality with higher voltage ratings and ongoing manufacturer support.