CS202-4D-2 Equivalent & Substitute Parts

Part Overview

The CS202-4D-2 is a Silicon Controlled Rectifier (SCR) rated for 400V off-state voltage with 4A on-state current capacity, manufactured by Central Semiconductor Corp in a TO-202 Long Tab through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The part operates across a temperature range of -40°C to 125°C and features standard recovery characteristics with a maximum on-state voltage of 1.8V.

Substiute Parts

CS202-4D-2

Central Semiconductor CorpIn Stock: 928CS202-4D-2 Datasheet

Current PartRFQ

S4004VS1TP

LittelfuseIn Stock: 2701S4004VS1TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS202-4D-2 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating: Off-state voltage must be 400V or greater to maintain blocking capability
• Current Rating: On-state RMS current must support 4A minimum to handle load requirements
• Gate Trigger Characteristics: Gate trigger voltage (Vgt) and current (Igt) must remain within acceptable limits for circuit compatibility
• On-State Voltage: Forward voltage drop must not exceed specified maximum to prevent excessive heat dissipation
• Hold Current: Must be compatible with circuit holding requirements
• Package Compatibility: Through-hole mounting is required; package footprint must accommodate circuit board layout
• Temperature Range: Operating temperature capability must cover application requirements
• Product Status: Active status ensures ongoing availability and supply chain reliability

The S4004VS1TP qualifies as a direct substitute based on matching or exceeding these parameters while maintaining electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The S4004VS1TP serves as the primary substitute for the obsolete CS202-4D-2. Selection is justified on the following basis:

Electrical Compatibility: Both devices maintain identical 400V off-state voltage and 4A RMS on-state current ratings. The S4004VS1TP exhibits superior gate sensitivity (50µA vs. 200µA trigger current) and lower on-state voltage drop (1.6V vs. 1.8V), resulting in improved circuit performance and reduced power dissipation.

Product Availability: The S4004VS1TP is classified as active with 2600 units in stock, ensuring supply chain continuity. The CS202-4D-2 is obsolete, making substitution necessary for ongoing production.

Compliance Status: The S4004VS1TP is ROHS3 compliant, meeting modern environmental and regulatory requirements. Both devices carry identical REACH and ECCN classifications.

Temperature Consideration: The S4004VS1TP operates to 110°C maximum versus 125°C for the CS202-4D-2. Applications requiring operation above 110°C require thermal analysis or alternative component selection.

Package Transition: The S4004VS1TP uses TO-251 (V-Pak/I-Pak) packaging versus TO-202 Long Tab. PCB layout modification is required to accommodate the different footprint and lead configuration.

Frequently Asked Questions (FAQ)

Q: Can the S4004VS1TP directly replace the CS202-4D-2 without circuit modification?

A: Electrical parameters are compatible. However, the different package type (TO-251 vs. TO-202) requires PCB layout changes. The sensitive gate characteristic of the S4004VS1TP may require gate circuit optimization in applications with marginal trigger signal levels.

Q: What is the significance of the gate trigger current difference (200µA vs. 50µA)?

A: The S4004VS1TP requires less gate current to trigger, reducing gate drive circuit complexity and power consumption. Existing gate circuits designed for 200µA will function with the S4004VS1TP but will operate with design margin.

Q: Does the lower maximum temperature rating (110°C vs. 125°C) affect substitution?

A: Applications operating continuously above 110°C require thermal analysis to confirm the S4004VS1TP remains within safe operating limits. Most industrial applications operate within this range.

Q: What is the difference between Standard Recovery and Sensitive Gate SCR types?

A: Standard Recovery SCRs require higher gate current for triggering. Sensitive Gate SCRs trigger with lower gate current, enabling simpler gate drive circuits. The S4004VS1TP's sensitive gate characteristic is an improvement over the original design.

Q: Is the higher hold current (4mA vs. 2mA) of the S4004VS1TP a concern?

A: The higher hold current is within acceptable limits for most applications. Circuits designed for 2mA hold current will function with the S4004VS1TP; verify that gate circuit design maintains sufficient current above the hold threshold during operation.