S2040R Equivalent & Substitute Parts

Part Overview

The S2040R is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 40A RMS current capacity, manufactured by Littelfuse Inc. in a TO-220-3 through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

The S2040R serves as a standard recovery thyristor suitable for AC switching and power control applications within its voltage and current specifications. Due to its obsolete status, sourcing direct replacements requires evaluation of substitute parts that maintain electrical compatibility while potentially offering enhanced performance characteristics or improved availability.

Substiute Parts

S2040R

Littelfuse Inc.In Stock: 1727S2040R Datasheet

Current PartRFQ

S6040R

Littelfuse Inc.In Stock: 2253S6040R Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S2040R is determined by the following critical parameters:

• Off-State Voltage Rating: The substitute must equal or exceed 200V to maintain blocking capability in the application circuit
• RMS Current Rating: The substitute must support at least 40A RMS to handle the design load
• Gate Trigger Characteristics: Vgt and Igt must remain within compatible ranges to ensure reliable gate drive circuit operation
• On-State Voltage Drop: Vtm specifications must be comparable to prevent excessive power dissipation changes
• Package and Mounting: TO-220-3 through-hole configuration must be maintained for mechanical and thermal compatibility
• Recovery Type: Standard recovery classification ensures switching behavior consistency

The S6040R qualifies as a direct substitute based on these criteria. While it provides enhanced off-state voltage capability (600V versus 200V), all other electrical parameters remain identical or compatible, and the package configuration is maintained in TO-220AB form factor.

Parameter Comparison

Engineering Selection Recommendations

The S6040R represents a functionally compatible substitute for the obsolete S2040R. Both components maintain identical gate trigger specifications, on-state voltage characteristics, and current handling capabilities. The primary distinction is the enhanced off-state voltage rating of the S6040R (600V versus 200V), which provides additional design margin in applications where the original 200V specification was adequate.

Both parts comply with ROHS3 standards and operate across the identical temperature range (-40°C to 125°C). The TO-220-3 package configuration is preserved, ensuring mechanical compatibility with existing PCB layouts and thermal management solutions.

Selection of the S6040R is appropriate for direct replacement in applications where the 200V blocking voltage of the S2040R was the limiting specification. The higher voltage rating does not degrade performance in circuits designed for 200V operation and may extend component reliability margins in marginal voltage conditions.

Frequently Asked Questions (FAQ)

Q: Can the S6040R directly replace the S2040R in existing designs?

A: Yes. The S6040R maintains identical gate trigger voltage and current specifications, on-state voltage characteristics, and current ratings. The enhanced 600V off-state voltage rating is backward compatible with 200V circuit designs. Package configuration (TO-220-3) and mounting type (through-hole) are identical.

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

A: The S6040R provides 600V off-state voltage blocking capability compared to the S2040R's 200V rating. All other electrical parameters—gate trigger characteristics, on-state voltage drop, current capacity, and operating temperature range—remain identical.

Q: Are there thermal management differences between the S2040R and S6040R?

A: Both components use the TO-220-3 package with identical thermal characteristics. Thermal management requirements are determined by on-state voltage drop and current load, which are identical between the two parts. Existing heatsink and thermal interface solutions are directly transferable.

Q: Does the higher voltage rating of the S6040R affect gate drive circuit design?

A: No. Gate trigger voltage (Vgt) and gate trigger current (Igt) specifications are identical. Gate drive circuits designed for the S2040R require no modification when using the S6040R.

Q: What compliance certifications apply to both parts?

A: Both the S2040R and S6040R comply with ROHS3 standards. Both are classified as EAR99 for export control purposes and share the same HTSUS commodity code (8541.30.0080).