CS218I-30M Equivalent & Substitute Parts

Part Overview

The CS218I-30M is a Silicon Controlled Rectifier (SCR) rated for 600V off-state voltage with 30A RMS on-state current capacity, housed in a TO-218 through-hole package. Manufactured by Central Semiconductor Corp, this component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and new design implementations. The obsolete status necessitates sourcing alternative components that maintain electrical and mechanical compatibility with existing applications.

Substiute Parts

CS218I-30M

Central Semiconductor CorpIn Stock: 778CS218I-30M Datasheet

Current PartRFQ

S6035KTP

Littelfuse Inc.In Stock: 1294S6035KTP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS218I-30M is determined by strict equivalence across the following critical parameters:

Voltage Rating: Off-state voltage must be 600V to maintain system voltage protection margins.

SCR Type: Standard Recovery classification ensures consistent switching characteristics and recovery time performance.

Package / Case: TO-218-3 through-hole configuration is required for mechanical and thermal interface compatibility.

Operating Temperature Range: -40°C to 125°C operational limits must be maintained or exceeded.

Gate Trigger Parameters: Vgt (Max) of 1.5V and Igt (Max) specifications determine gate drive circuit compatibility.

On-State Performance: Current ratings and voltage drop characteristics must support the application's load requirements.

The S6035KTP from Littelfuse Inc. qualifies as a substitute based on matching voltage rating, SCR type, package configuration, and operating temperature range. The S6035KTP provides enhanced current capacity (35A RMS vs. 30A RMS) and improved on-state voltage characteristics, making it suitable for direct replacement in CS218I-30M applications.

Parameter Comparison

Engineering Selection Recommendations

The S6035KTP represents the primary substitute for the obsolete CS218I-30M. Selection is based on the following engineering criteria:

Product Status: The CS218I-30M is obsolete, while the S6035KTP maintains active product status with current manufacturing and distribution support.

Compliance & Certifications: The S6035KTP is ROHS3 compliant and carries EAR99 ECCN classification, providing regulatory alignment for modern applications. The CS218I-30M is RoHS non-compliant and marked as obsolete.

Electrical Compatibility: The S6035KTP meets or exceeds all critical electrical parameters of the CS218I-30M. The improved on-state voltage (1.8V vs. 2.1V) and higher current capacity (35A vs. 30A) provide enhanced performance margins.

Package Compatibility: Both components utilize TO-218 through-hole packaging. The S6035KTP offers isolated tab variants, providing flexibility for thermal and electrical isolation requirements in specific applications.

Availability: The S6035KTP is available in production quantities (1233 Pcs in stock) compared to the CS218I-30M's limited obsolete inventory (746 Pcs).

Frequently Asked Questions (FAQ)

Q: Can the S6035KTP directly replace the CS218I-30M in existing designs?

A: Yes. The S6035KTP maintains electrical equivalence across all critical parameters including voltage rating, gate trigger characteristics, and operating temperature range. The TO-218 package configuration ensures mechanical compatibility with existing PCB layouts and thermal management systems.

Q: What are the key differences between these components?

A: The S6035KTP provides higher RMS current capacity (35A vs. 30A), lower on-state voltage drop (1.8V vs. 2.1V), and lower gate trigger current (40mA vs. 50mA). These represent performance improvements rather than incompatibilities. The S6035KTP is also actively manufactured and RoHS3 compliant, whereas the CS218I-30M is obsolete and RoHS non-compliant.

Q: Are there package considerations for substitution?

A: Both components use TO-218-3 through-hole packages. The S6035KTP is available in isolated tab variants (TO-218-3 Isolated Tab, TO-218AC), which may provide additional thermal or electrical isolation options depending on application requirements. Standard TO-218 footprints accommodate both configurations.

Q: What is the significance of the improved on-state voltage in the S6035KTP?

A: The lower on-state voltage (1.8V vs. 2.1V) reduces power dissipation during conduction, improving thermal performance and system efficiency. This represents a beneficial characteristic for direct substitution.

Q: Does the higher current rating of the S6035KTP affect compatibility?

A: No. Higher current capacity provides additional design margin and does not compromise compatibility with applications designed for the 30A CS218I-30M. The component will operate safely within the original design's current requirements.

Q: What certifications should be considered for new designs?

A: The S6035KTP's ROHS3 compliance and EAR99 ECCN classification make it suitable for modern regulatory environments. New designs should prioritize the S6035KTP over the obsolete CS218I-30M to ensure long-term supply chain viability and regulatory alignment.