PS7142-2A-A Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The PS7142-2A-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-DIP through-hole package. This component is designed for AC/DC load switching applications with a maximum load voltage of 400V and 200mA load current capacity. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

PS7142-2A-A

CELIn Stock: 908PS7142-2A-A Datasheet

Current PartRFQ

AQW254

Panasonic Electric WorksIn Stock: 1365AQW254 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS7142-2A-A is determined by the following critical parameters:

Mandatory Matching Criteria:

• Circuit configuration: SPST-NO (1 Form A) x 2 channels
• Package type: 8-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Load voltage range: 0V to 400V
• Output type: AC and DC compatible
• Termination style: PC Pin

Allowable Parameter Variations:

• Input voltage: Substitute may differ from 1.2VDC if compatible with control circuitry
• Load current: Substitute may be lower than 200mA if application requirements permit
• On-state resistance: Substitute may exceed 10 Ohms if within acceptable application limits

The AQW254 manufactured by Panasonic Electric Works meets all mandatory matching criteria and qualifies as a direct substitute for the PS7142-2A-A.

Parameter Comparison

Engineering Selection Recommendations

PS7142-2A-A Selection Criteria:

• Use only for legacy system maintenance where original component specifications are non-negotiable
• Limited availability due to obsolete status (884 pcs in current inventory)
• No ongoing manufacturer support or design updates

AQW254 Selection Criteria:

• Recommended for new designs and system upgrades
• Active product status ensures long-term availability and manufacturer support
• RoHS3 compliant and REACH unaffected, meeting current environmental regulations
• Functionally equivalent for applications requiring load currents up to 120mA
• Higher on-state resistance (16 Ohms vs. 10 Ohms) requires verification that voltage drop remains within acceptable limits for the specific application

Compliance Considerations:

• Both parts carry ECCN EAR99 classification
• AQW254 provides superior compliance posture with RoHS3 compliance and REACH unaffected status
• PS7142-2A-A is REACH affected, limiting use in new EU-regulated applications

Frequently Asked Questions (FAQ)

Q: Can the AQW254 directly replace the PS7142-2A-A in existing PCB designs?

A: Yes, the AQW254 provides direct PCB compatibility. Both components use identical 8-DIP (0.300", 7.62mm) through-hole packages with PC pin termination. No PCB layout modifications are required for physical installation.

Q: What is the significance of the 80mA load current difference between these parts?

A: The PS7142-2A-A is rated for 200mA maximum load current, while the AQW254 is rated for 120mA. Applications drawing more than 120mA cannot use the AQW254 as a substitute. Verify your application's actual load current requirement before selecting the AQW254.

Q: How does the higher on-state resistance of the AQW254 affect circuit performance?

A: The AQW254 has a maximum on-state resistance of 16 Ohms compared to 10 Ohms for the PS7142-2A-A. This 6-Ohm difference will increase voltage drop across the relay during conduction. Calculate the voltage drop using Ohm's law (V = I × R) with your application's load current to ensure the voltage drop remains acceptable for your circuit.

Q: Why is the PS7142-2A-A classified as obsolete?

A: The PS7142-2A-A is no longer manufactured by CEL. Obsolete status indicates the manufacturer has discontinued production and no longer provides design support or technical updates. Existing inventory is finite and will eventually be depleted.

Q: Is the AQW254 suitable for new product designs?

A: Yes, the AQW254 is actively manufactured by Panasonic Electric Works and is the recommended choice for new designs. Active product status ensures availability, manufacturer support, and compliance with current environmental regulations including RoHS3.

Q: What are the input voltage requirements for each part?

A: The PS7142-2A-A requires 1.2VDC input, while the AQW254 requires 1.14VDC input. Both values are sufficiently close that standard 3.3V or 5V logic outputs can drive either relay. Verify your control circuit output voltage is compatible with the selected relay's input specification.

Q: Are there any environmental or regulatory differences between these parts?

A: Yes. The AQW254 is RoHS3 compliant and REACH unaffected, making it suitable for EU and environmentally regulated markets. The PS7142-2A-A is REACH affected, which may restrict its use in new applications subject to EU regulations.