CASO242 Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The CASO242 is a solid state relay (SSR) with SPST-NO (Single Pole Single Throw - Normally Open) configuration manufactured by Sensata-Crydom. This component is rated for 2A load current with input voltage range of 4–10VDC and output voltage range of 12–280VAC. The CASO242 operates with zero-cross switching for AC loads and features through-hole PC pin termination in a 4-SIP package.

The CASO242 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

CASO242

Sensata-CrydomIn Stock: 993CASO242 Datasheet

Current PartRFQ

ASO242

Sensata TechnologiesIn Stock: 1299ASO242 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASO242 qualifies as a direct substitute for the CASO242 based on the following critical parameters:

• Circuit Configuration: Both parts implement SPST-NO (1 Form A) switching topology
• Input Voltage Range: Identical at 4–10VDC
• Output Voltage Range: Identical at 12–280VAC
• Load Current Rating: Both rated for 2A
• Output Type: Both feature AC output with zero-cross switching
• Mounting Type: Both are through-hole mounted
• Termination Style: Both use PC pin termination
• Package / Case: Both use 4-SIP package format

The ASO242 is manufactured by Sensata Technologies and maintains active product status, ensuring ongoing availability and support compared to the obsolete CASO242.

Parameter Comparison

Engineering Selection Recommendations

The ASO242 is the appropriate substitute for the CASO242 in applications requiring SPST-NO solid state relay functionality with the specified electrical and mechanical parameters. The ASO242 maintains identical electrical ratings and package configuration while offering the advantage of active product status and ROHS3 compliance. Both parts carry REACH Unaffected status, confirming regulatory alignment.

Selection of the ASO242 eliminates obsolescence risk and provides access to current manufacturing and supply chain support from Sensata Technologies.

Frequently Asked Questions (FAQ)

Q: Can the ASO242 directly replace the CASO242 in existing designs?

A: Yes. The ASO242 provides electrical and mechanical equivalence across all critical parameters: SPST-NO circuit configuration, 4–10VDC input range, 12–280VAC output range, 2A load current, AC zero-cross output type, through-hole mounting, PC pin termination, and 4-SIP package format.

Q: What is the primary advantage of switching from CASO242 to ASO242?

A: The CASO242 is obsolete, while the ASO242 maintains active product status. This ensures component availability, ongoing manufacturing support, and compliance with current regulatory standards including ROHS3.

Q: Are there any package or pinout differences between these parts?

A: Both parts use 4-SIP package format with PC pin termination. No package or pinout modifications are required for substitution.

Q: Do both parts meet the same regulatory requirements?

A: Both parts carry REACH Unaffected status. The ASO242 additionally meets ROHS3 compliance, providing enhanced regulatory alignment for new designs and production environments.

Q: What inventory considerations apply to this substitution?

A: The CASO242 has 932 pieces in stock (obsolete status). The ASO242 has 1,241 pieces available with active product status, providing greater long-term supply security.