S2035KTP Equivalent & Substitute Parts

Part Overview

The S2035KTP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 35A RMS current capacity in a TO-218 isolated tab package. Manufactured by Littelfuse Inc., this component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The S2035KTP serves in standard recovery thyristor applications requiring moderate voltage ratings and through-hole mounting configurations.

Substiute Parts

S2035KTP

Littelfuse Inc.In Stock: 1064S2035KTP Datasheet

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S4035KTP

Littelfuse Inc.In Stock: 1651S4035KTP Datasheet

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S6035KTP

Littelfuse Inc.In Stock: 1294S6035KTP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S2035KTP are identified based on electrical and mechanical compatibility within the following criteria:

Preserved Parameters (Must Match):

• SCR Type: Standard Recovery
• Current - On State (It RMS): 35 A
• Voltage - Gate Trigger (Vgt) Max: 1.5 V
• Current - Gate Trigger (Igt) Max: 40 mA
• Voltage - On State (Vtm) Max: 1.8 V
• Current - Hold (Ih) Max: 50 mA
• Operating Temperature Range: -40°C to 125°C
• Package / Case: TO-218-3 Isolated Tab
• Mounting Type: Through Hole
• Manufacturer: Littelfuse Inc.

Variable Parameter (Allows Substitution):

• Voltage - Off State: Can be rated higher than 200V while maintaining all other electrical characteristics

The S4035KTP and S6035KTP are qualified substitutes because they maintain identical gate trigger characteristics, on-state voltage performance, current ratings, and thermal operating range while offering higher voltage ratings of 400V and 600V respectively. Both substitute parts are in active product status with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

S4035KTP (400V Rating): This substitute provides a 2x voltage margin over the original S2035KTP while maintaining identical gate drive requirements and current handling. The active product status ensures long-term availability and manufacturing consistency. ROHS3 compliance is maintained. Selection is appropriate for applications where the 200V rating of the original part is marginal or where system voltage tolerance requires additional headroom.

S6035KTP (600V Rating): This substitute provides a 3x voltage margin over the original S2035KTP with identical electrical performance in all other parameters. Active product status and ROHS3 compliance are confirmed. Selection is appropriate for applications requiring maximum voltage protection or where the S2035KTP's 200V rating presents reliability concerns in the target system environment.

Both substitutes are manufactured by Littelfuse Inc. and maintain the same TO-218-3 isolated tab package, ensuring mechanical and thermal interface compatibility with existing PCB layouts and heatsinking arrangements.

Frequently Asked Questions (FAQ)

Q: Can S4035KTP or S6035KTP be used as direct replacements for S2035KTP in existing designs?

A: Yes, both parts are direct mechanical and electrical substitutes. The higher voltage ratings do not affect gate trigger characteristics, on-state voltage drop, or current handling. PCB footprints and heatsink mounting are identical due to matching TO-218-3 package specifications.

Q: What is the primary difference between the three parts?

A: The off-state voltage rating is the only electrical difference. S2035KTP is rated 200V, S4035KTP is rated 400V, and S6035KTP is rated 600V. All other parameters including gate trigger voltage, on-state voltage, current ratings, and operating temperature range are identical.

Q: Why is the S2035KTP obsolete while S4035KTP and S6035KTP remain active?

A: Product status reflects manufacturing availability and market demand. The higher voltage variants (S4035KTP and S6035KTP) maintain active status with confirmed inventory. For new designs or ongoing production requiring the S2035KTP, substitution with either active variant is the appropriate path.

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

A: No. All three parts share identical operating temperature range (-40°C to 125°C), on-state voltage characteristics, and surge current ratings. Thermal performance in a given application is determined by current loading and heatsinking, not by the voltage rating difference.

Q: What compliance certifications apply to the substitute parts?

A: Both S4035KTP and S6035KTP are ROHS3 compliant. S6035KTP additionally carries REACH Unaffected status. Both parts carry EAR99 export classification and 8541.30.0080 HTSUS code, matching the original S2035KTP.