PS7142L-2A-E3-A Equivalent & Substitute Parts

Part Overview

The PS7142L-2A-E3-A is a 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-SMD surface mount package. This component is rated for 200 mA load current across a 0–400 V AC/DC voltage range with a maximum on-state resistance of 10 Ohms. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

PS7142L-2A-E3-A

CELIn Stock: 1120PS7142L-2A-E3-A Datasheet

Current PartRFQ

AQW254AX

Panasonic Electric WorksIn Stock: 1006AQW254AX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS7142L-2A-E3-A is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO (1 Form A) x 2 channels
• Package type: 8-SMD (0.300", 7.62mm)
• Termination style: Gull Wing
• Load voltage range: 0 V ~ 400 V (AC/DC)
• Mounting type: Surface Mount

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 current: 120 mA to 200 mA (substitute must support the application's required current)
• On-state resistance: Up to 16 Ohms (higher resistance acceptable if application tolerates increased voltage drop)

The AQW254AX from Panasonic Electric Works meets all mandatory matching parameters and operates within the allowable variation ranges for input voltage and on-state resistance. The reduced load current rating (120 mA vs. 200 mA) requires application-level verification that the substitute's current capacity is sufficient for the intended circuit.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: AQW254AX

The AQW254AX is the identified equivalent for the obsolete PS7142L-2A-E3-A. Selection of this substitute is supported by the following factors:

• Product Status: The AQW254AX maintains active production status, ensuring long-term availability and supply chain continuity.
• Compliance: The AQW254AX is RoHS Compliant, meeting current environmental and regulatory requirements.
• Package Compatibility: Identical 8-SMD (0.300", 7.62mm) gull wing package enables direct PCB footprint compatibility without layout modification.
• Electrical Compatibility: Matching circuit configuration (SPST-NO x 2), load voltage range (0–400 V AC/DC), and input voltage (1.14 VDC vs. 1.2 VDC) provide functional equivalence.

Critical Design Consideration: The AQW254AX load current rating is 120 mA, compared to the PS7142L-2A-E3-A rating of 200 mA. Circuit designs operating at or above 120 mA load current must be evaluated to confirm the substitute's current capacity is adequate. The increased on-state resistance (16 Ohms vs. 10 Ohms) results in proportionally higher voltage drop across the relay contacts; this must be assessed in applications with tight voltage margin requirements.

Frequently Asked Questions (FAQ)

Q: Can the AQW254AX be used as a direct replacement for the PS7142L-2A-E3-A without PCB modification?

A: Yes. Both components share identical package geometry (8-SMD, 0.300" / 7.62mm), termination style (Gull Wing), and pin configuration. No PCB layout changes are required for physical substitution.

Q: What is the impact of the 120 mA load current rating on the AQW254AX compared to the 200 mA rating of the PS7142L-2A-E3-A?

A: The AQW254AX is rated for a maximum continuous load current of 120 mA. Applications requiring load currents between 120 mA and 200 mA cannot use the AQW254AX without exceeding its rated specifications. Circuit designs must be reviewed to confirm actual load current does not exceed 120 mA.

Q: How does the increased on-state resistance of the AQW254AX (16 Ohms vs. 10 Ohms) affect circuit performance?

A: Higher on-state resistance increases voltage drop across the relay contacts. At 120 mA load current, the AQW254AX produces a maximum voltage drop of 1.92 V (120 mA × 16 Ohms), compared to 1.2 V for the PS7142L-2A-E3-A (200 mA × 10 Ohms). Applications with load voltages near the lower end of the 0–400 V range must verify that this additional voltage drop does not compromise load operation.

Q: Are there differences in input voltage requirements between the two parts?

A: The PS7142L-2A-E3-A requires 1.2 VDC input, while the AQW254AX requires 1.14 VDC input. This 0.06 VDC difference is negligible in most control circuits and does not present a practical compatibility issue.

Q: What is the significance of the RoHS Compliance status of the AQW254AX?

A: RoHS Compliance indicates the AQW254AX meets the Restriction of Hazardous Substances directive, restricting lead, cadmium, mercury, and other hazardous materials. This is a regulatory requirement for products sold into the European Union and many other markets. The PS7142L-2A-E3-A RoHS status is not specified; the AQW254AX provides documented compliance for applications requiring RoHS-compliant components.

Q: Is the Moisture Sensitivity Level (MSL) difference between the parts significant?

A: The PS7142L-2A-E3-A is rated MSL 1 (Unlimited), indicating no moisture sensitivity. The AQW254AX lists MSL as Not Applicable, indicating the component does not require moisture-sensitive handling precautions. Both parts are suitable for standard manufacturing and storage environments without special moisture control measures.