PS7241-2A Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The PS7241-2A is a surface mount solid state relay (SSR) manufactured by CEL, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with dual channels in an 8-SOP package. This component is rated for 120 mA load current at 0–400 V output voltage with 1.2 VDC input control voltage and 30 Ohms maximum on-state resistance.

The PS7241-2A is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.

Substiute Parts

PS7241-2A

CELIn Stock: 1975PS7241-2A Datasheet

Current PartRFQ

AQW210S

Panasonic Electric WorksIn Stock: 1491AQW210S Datasheet

SimilarRFQ

AQW214S

Panasonic Electric WorksIn Stock: 1899AQW214S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PS7241-2A are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO (1 Form A) x 2
• Package type: 8-SOP (0.173", 4.40mm Width)
• Mounting type: Surface Mount
• Termination style: Gull Wing
• Output type: AC, DC

Allowable Parameter Variations: Substitute parts may operate within the following ranges while maintaining functional compatibility:

• Input voltage: 1.14 VDC to 1.2 VDC
• Load voltage: 0 V to 350 V minimum (up to 400 V acceptable)
• Load current: 80 mA to 120 mA
• On-state resistance: 30 Ohms to 50 Ohms maximum

The identified substitute parts are Panasonic Electric Works PhotoMOS™ AQW series components, which maintain identical package geometry and circuit topology while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

AQW210S Selection Criteria: The AQW210S is suitable for applications where load voltage does not exceed 350 V and load current requirements are 100 mA or less. This substitute offers ROHS3 compliance and REACH unaffected status, providing regulatory advantages over the obsolete PS7241-2A. The slightly higher on-state resistance (35 Ohms vs. 30 Ohms) and lower input voltage (1.14 VDC vs. 1.2 VDC) remain within acceptable operating margins for most switching applications.

AQW214S Selection Criteria: The AQW214S is suitable for applications requiring full 400 V load voltage capability with load current of 80 mA or less. This substitute maintains the same maximum load voltage rating as the PS7241-2A while offering active product status, ROHS3 compliance, and REACH unaffected status. The higher on-state resistance (50 Ohms) and lower load current rating (80 mA) must be evaluated against specific circuit requirements.

Compliance Advantages: Both substitute parts provide ROHS3 compliance and REACH unaffected status, eliminating regulatory restrictions associated with the obsolete, non-compliant PS7241-2A. Active product status ensures continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can AQW210S and AQW214S be used interchangeably with PS7241-2A?

A: Both parts share identical package geometry (8-SOP), circuit configuration (SPST-NO x 2), and mounting characteristics. Selection between them depends on specific load voltage and current requirements. AQW210S is limited to 350 V load voltage and 100 mA current. AQW214S supports full 400 V load voltage but is rated for 80 mA maximum current. The PS7241-2A is rated for 120 mA at 400 V, so direct replacement requires load current verification.

Q: What is the impact of on-state resistance differences?

A: The PS7241-2A specifies 30 Ohms maximum on-state resistance. AQW210S specifies 35 Ohms, and AQW214S specifies 50 Ohms. Higher on-state resistance increases voltage drop across the relay contacts during conduction, resulting in greater power dissipation. Circuit designs must account for this increased resistive load, particularly in low-voltage or high-current applications.

Q: Are input voltage differences significant?

A: The PS7241-2A requires 1.2 VDC input, while both substitute parts operate at 1.14 VDC. This 0.06 VDC difference is negligible in most control circuits and does not affect practical substitution compatibility.

Q: What are the regulatory compliance implications?

A: The PS7241-2A is RoHS non-compliant and REACH affected. Both AQW210S and AQW214S are ROHS3 compliant and REACH unaffected. Designs targeting modern regulatory environments benefit from substitution to compliant alternatives.

Q: How do load voltage ratings affect substitution?

A: The PS7241-2A and AQW214S both support 0–400 V load voltage. The AQW210S is limited to 0–350 V. Applications requiring full 400 V switching capability must use AQW214S or verify that actual operating voltage does not exceed 350 V when using AQW210S.

Q: Is PCB layout modification required?

A: No. Both substitute parts use identical 8-SOP package dimensions and gull wing termination. Direct PCB footprint compatibility is maintained without layout changes.