CX241R Solid State Relay - Equivalent & Substitute Parts

Part Overview

The CX241R is an active-status solid state relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (1 Form A) relay in a 4-SIP package. This component is designed for AC load switching applications with input control voltage ranging from 4 to 10VDC and load voltage capability from 12V to 280V at 1.5A maximum current. The CX241R is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), making it suitable for standard industrial and commercial applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges.

Substiute Parts

CX241R

Sensata-CrydomIn Stock: 1144CX241R Datasheet

Current PartRFQ

ASR-SD240D3RL

Altran Magnetics, LLCIn Stock: 1061ASR-SD240D3RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASR-SD240D3RL qualifies as a substitute for the CX241R based on the following critical parameters:

Electrical Compatibility:

• Both parts maintain SPST-NO (1 Form A) circuit configuration
• Both support AC output switching
• Both operate within overlapping load voltage range (12V–280V for CX241R; 24V–280V for ASR-SD240D3RL)
• Input voltage ranges are compatible (CX241R: 4–10VDC; ASR-SD240D3RL: 4–15VDC)

Mechanical Compatibility:

• Identical package type: 4-SIP
• Identical mounting type: Through Hole
• Identical termination style: PC Pin

Regulatory Compliance:

• Both are ROHS3 compliant
• Both carry REACH Unaffected status
• Both classified under EAR99 export control

Load Current Consideration: The ASR-SD240D3RL provides 3A load current capacity compared to the CX241R's 1.5A rating. This higher current rating does not prevent substitution; it represents an upgraded capability suitable for applications requiring the CX241R's specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (CX241R): Select the CX241R when the original specification is available and inventory is sufficient. The part is active-status with full ROHS3 and REACH compliance, supporting standard through-hole PCB assembly processes.

Substitute Selection (ASR-SD240D3RL): The ASR-SD240D3RL is suitable as a substitute when CX241R availability is constrained. The substitute maintains identical circuit topology, package footprint, and mounting characteristics. The higher 3A current rating accommodates applications designed for the CX241R's 1.5A specification without performance degradation. Both parts carry equivalent regulatory compliance certifications.

Application Constraints: Applications requiring load voltages below 24V should confirm ASR-SD240D3RL compatibility, as its minimum load voltage specification is 24V compared to the CX241R's 12V minimum. For applications operating at 12–23V load range, the CX241R remains the required selection.

Frequently Asked Questions (FAQ)

Q: Can the ASR-SD240D3RL directly replace the CX241R in existing designs?

A: Yes, for applications operating within the overlapping parameter ranges. Both parts share identical 4-SIP package geometry, through-hole mounting, and PC pin termination. Electrical compatibility is maintained across the common operating envelope (4–10VDC input, 24–280V load, ≤1.5A load current).

Q: What is the load voltage limitation when substituting?

A: The CX241R supports load voltages from 12V to 280V. The ASR-SD240D3RL supports 24V to 280V. For applications requiring 12–23V load operation, the CX241R is the required part. For 24–280V applications, both parts are compatible.

Q: Does the higher current rating of the ASR-SD240D3RL affect circuit operation?

A: No. The ASR-SD240D3RL's 3A rating represents maximum capability. In circuits designed for 1.5A operation, the substitute will function identically to the original part. Higher current rating does not introduce operational differences at lower current levels.

Q: Are both parts suitable for the same PCB assembly process?

A: Yes. Both parts are configured as through-hole 4-SIP components with PC pin termination, compatible with standard wave soldering and through-hole assembly processes.

Q: What regulatory compliance applies to both parts?

A: Both the CX241R and ASR-SD240D3RL are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements for industrial applications.