PS7141L-2B-A Solid State Relay SPST-NC Equivalent & Substitute Parts

Part Overview

The PS7141L-2B-A is a solid state relay (SSR) manufactured by CEL, configured as a dual SPST-NC (1 Form B) switching element in an 8-SMD surface mount package. This component operates with a 1.2VDC input signal and switches loads up to 400V at 150mA maximum current capacity. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure long-term component availability.

Substiute Parts

PS7141L-2B-A

CELIn Stock: 1151PS7141L-2B-A Datasheet

Current PartRFQ

AQW254A

Panasonic Electric WorksIn Stock: 1195AQW254A Datasheet

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AQW414A

Panasonic Electric WorksIn Stock: 1698AQW414A Datasheet

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AQW414EHA

Panasonic Electric WorksIn Stock: 2081AQW414EHA Datasheet

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AQW454A

Panasonic Electric WorksIn Stock: 3692AQW454A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS7141L-2B-A is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration (SPST-NC dual Form B switching)
• Package type (8-SMD with 0.300" / 7.62mm pitch)
• Mounting style (Surface Mount with Gull Wing termination)
• Load voltage range (0V ~ 400V AC/DC operation)

Secondary Compatibility Criteria:

• Input voltage compatibility (1.2VDC nominal)
• Load current capacity (minimum 150mA required)
• On-state resistance performance (maximum 30 Ohms)

The substitute parts identified are all Panasonic Electric Works PhotoMOS™ AQW series components. These devices maintain identical package geometry, mounting configuration, and load voltage specifications. However, substitution requires evaluation of load current and on-state resistance characteristics relative to the original PS7141L-2B-A specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution Candidates (SPST-NC Configuration):

The AQW414EHA, AQW414A, and AQW454A are SPST-NC (Form B) devices that maintain the same switching polarity as the PS7141L-2B-A. Selection among these three depends on load current requirements:

• AQW454A: Recommended for applications requiring 120mA ~ 150mA load current. Provides 16 Ohms on-state resistance and 120mA maximum current rating. Suitable for designs where the original 150mA specification can be reduced to 120mA without functional impact.

• AQW414EHA: Suitable for applications with load current requirements up to 100mA. Provides 35 Ohms on-state resistance, closest to the original 30 Ohms specification. Recommended when load current does not exceed 100mA.

• AQW414A: Applicable for applications with load current up to 100mA. Provides 50 Ohms on-state resistance. Use only when on-state resistance margin is not critical.

All three SPST-NC alternatives are active products with ROHS3 compliance and REACH unaffected status, providing superior long-term availability compared to the obsolete PS7141L-2B-A.

Alternative Configuration (SPST-NO):

The AQW254A is a SPST-NO (Form A) device with opposite switching polarity. This part is not a direct substitute and requires circuit redesign. Use only if the application logic can accommodate normally-open switching behavior.

Frequently Asked Questions (FAQ)

Q: Can the AQW414EHA directly replace the PS7141L-2B-A without circuit modification?

A: The AQW414EHA maintains identical package geometry, mounting style, and load voltage specifications. However, it is rated for 100mA maximum load current versus the original 150mA. Direct substitution is possible only if the application load current does not exceed 100mA. If the design requires 150mA capacity, the AQW454A is the appropriate choice.

Q: What is the difference between AQW414EHA and AQW414A?

A: Both are SPST-NC dual Form B devices with identical electrical ratings except for on-state resistance. The AQW414EHA provides 35 Ohms maximum on-state resistance, while the AQW414A provides 50 Ohms maximum. The AQW414EHA is preferred when on-state resistance performance is critical to application function.

Q: Why is the AQW254A listed as a substitute if it has different circuit configuration?

A: The AQW254A is a SPST-NO (Form A) device, which is the opposite polarity of the PS7141L-2B-A SPST-NC (Form B) configuration. It is not a direct substitute and requires circuit redesign to implement normally-open switching logic instead of normally-closed. This part is listed only for reference in applications where switching polarity can be modified.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the 8-SMD (0.300", 7.62mm) package with Gull Wing termination, identical to the PS7141L-2B-A. PCB footprint and land pattern modifications are not required.

Q: What is the input voltage difference between the original and substitute parts?

A: The PS7141L-2B-A operates at 1.2VDC input, while all Panasonic PhotoMOS™ AQW substitutes operate at 1.14VDC input. This 0.06VDC difference is within typical circuit tolerance and does not affect practical substitution compatibility.

Q: Do the substitute parts have better environmental compliance?

A: Yes. All Panasonic PhotoMOS™ AQW substitute parts are ROHS3 compliant and REACH unaffected, compared to the PS7141L-2B-A which is REACH affected. This provides improved regulatory compliance for new designs and long-term supply chain sustainability.