S2055MTP Equivalent & Substitute Parts

Part Overview

The S2055MTP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage and 55A RMS current in a TO-218 through-hole package. Manufactured by Littelfuse Inc., this component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The S2055MTP serves in standard recovery thyristor applications requiring moderate voltage ratings and high current handling capability.

Substiute Parts

S2055MTP

Littelfuse Inc.In Stock: 960S2055MTP Datasheet

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S4055MTP

LittelfuseIn Stock: 1079S4055MTP Datasheet

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S6055MTP

Littelfuse Inc.In Stock: 789S6055MTP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S2055MTP are qualified based on the following criteria:

Electrical Compatibility Parameters:

• Gate trigger voltage (Vgt) and current (Igt) characteristics must match or be superior
• On-state voltage drop (Vtm) and hold current (Ih) must remain within equivalent ranges
• SCR type classification (Standard Recovery) must be maintained
• Operating temperature range must encompass or exceed the original specification

Mechanical Compatibility Parameters:

• Package type must be TO-218 series (TO-218-3 or TO-218AC)
• Through-hole mounting configuration must be preserved
• Non-isolated tab configuration must be maintained

Voltage Rating Consideration: The S2055MTP operates at 200V off-state voltage. Substitute parts with higher voltage ratings (400V, 600V) are electrically compatible in applications where the 200V rating is sufficient, as higher-rated devices can operate safely at lower voltages. The reverse is not true—lower voltage-rated devices cannot substitute for the S2055MTP.

Parameter Comparison

Engineering Selection Recommendations

S4055MTP (400V Rating): The S4055MTP is an active product with identical electrical characteristics to the S2055MTP except for a doubled off-state voltage rating (400V vs. 200V). This part is suitable for applications where the circuit voltage does not exceed 200V, as the higher voltage rating provides additional safety margin without affecting performance at lower voltages. Product status is active with full availability.

S6055MTP (600V Rating): The S6055MTP is an active product with a 600V off-state voltage rating, providing the highest voltage margin among available substitutes. All other electrical parameters remain identical to the S2055MTP. This part is appropriate for applications requiring maximum voltage headroom while maintaining the same current and thermal characteristics. Product status is active with confirmed inventory.

Both substitute parts maintain ROHS3 compliance and are manufactured by Littelfuse Inc., ensuring consistency with the original component's regulatory and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the S4055MTP or S6055MTP be used as direct replacements for the S2055MTP?

A: Yes, both parts are electrically and mechanically compatible. The higher voltage ratings do not prevent operation in circuits designed for 200V. The gate trigger characteristics, on-state voltage drop, and current ratings are identical, ensuring equivalent circuit behavior.

Q: What is the primary difference between these three SCR models?

A: The off-state voltage rating is the distinguishing parameter. The S2055MTP is rated for 200V, the S4055MTP for 400V, and the S6055MTP for 600V. All other electrical specifications and the TO-218 package configuration are identical.

Q: Why is the S2055MTP listed as obsolete?

A: The S2055MTP is no longer in active production. The S4055MTP and S6055MTP are the current active alternatives from Littelfuse Inc. for this product category.

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

A: No. The operating temperature range (-40°C to 125°C), current ratings (55A RMS), and thermal characteristics are identical across all three models.

Q: Can a lower voltage-rated SCR substitute for a higher voltage requirement?

A: No. A 200V-rated device cannot be used in a 400V or 600V application. Substitution is only valid when the replacement part has an equal or higher voltage rating than the original specification.

Q: Are both substitute parts available in the same packaging?

A: Yes. Both the S4055MTP and S6055MTP are supplied in TO-218-3 and TO-218AC packages with through-hole mounting, matching the S2055MTP configuration.