S2055WTP Equivalent & Substitute Parts

Part Overview

The S2055WTP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 55A RMS current capacity in a TO-218X through-hole package, manufactured by Littelfuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The S2055WTP operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

S2055WTP

Littelfuse Inc.In Stock: 940S2055WTP Datasheet

Current PartRFQ

S4055WTP

Littelfuse Inc.In Stock: 1201S4055WTP Datasheet

UpgradeRFQ

S6055WTP

Littelfuse Inc.In Stock: 792S6055WTP Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S2055WTP are qualified based on the following criteria:

Mechanical Compatibility: All substitute parts maintain identical TO-218X-3 package and through-hole mounting configuration, ensuring direct PCB footprint compatibility without layout modifications.

Electrical Core Parameters: Substitute parts preserve the following electrical characteristics:

• Gate trigger voltage (Vgt Max): 1.5 V
• Gate trigger current (Igt Max): 40 mA
• On-state voltage (Vtm Max): 1.8 V
• Average on-state current (It AV): 35 A
• RMS on-state current (It RMS): 55 A
• Hold current (Ih Max): 60 mA
• Off-state current (Max): 10 µA
• Non-repetitive surge current: 550A (50Hz), 650A (60Hz)
• SCR Type: Standard Recovery
• Operating temperature range: -40°C to 125°C

Voltage Rating Variation: Substitute parts are available with higher off-state voltage ratings (400V and 600V) while maintaining all other electrical parameters. Higher voltage ratings provide enhanced design margin and are backward-compatible for 200V applications.

Product Status & Compliance: All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: The S4055WTP and S6055WTP are active products suitable for replacing obsolete S2055WTP units. Both maintain identical mechanical footprint and electrical performance characteristics across all switching parameters, gate control specifications, and thermal operating range.

Voltage Rating Selection: Choose S4055WTP for applications requiring 400V blocking capability or S6055WTP for 600V blocking capability. Both parts function correctly in circuits designed for 200V operation, as higher voltage ratings provide additional design margin without affecting switching behavior or on-state characteristics.

Compliance & Availability: Both substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. Active product status ensures long-term supply chain availability compared to the obsolete S2055WTP.

Frequently Asked Questions (FAQ)

Q: Can S4055WTP or S6055WTP be used as direct replacements for S2055WTP?

A: Yes. Both parts share identical TO-218X-3 package configuration, gate control parameters, on-state voltage and current ratings, and operating temperature range. The higher voltage ratings (400V and 600V) are backward-compatible with 200V circuit designs.

Q: What is the primary difference between the three part numbers?

A: The off-state voltage rating differs: S2055WTP is rated 200V, S4055WTP is rated 400V, and S6055WTP is rated 600V. All other electrical and mechanical specifications remain identical.

Q: Are there any thermal or current handling differences between these parts?

A: No. All three parts maintain identical RMS current capacity (55A), average current capacity (35A), on-state voltage drop (1.8V max), and operating temperature range (-40°C to 125°C).

Q: Which substitute part should be selected for new designs?

A: S4055WTP or S6055WTP are both active products. Selection depends on the circuit's voltage requirements. For applications operating at or below 200V, either part is suitable. For higher voltage applications, S6055WTP provides maximum design margin.

Q: Is the packaging identical across all three parts?

A: Yes. All parts use TO-218X-3 through-hole package with identical mechanical dimensions and PCB footprint compatibility.

Q: Do these parts have different gate trigger requirements?

A: No. Gate trigger voltage (Vgt Max 1.5V) and gate trigger current (Igt Max 40mA) are identical across all three parts.