PS7221A-2A-A Equivalent & Substitute Parts

Part Overview

The PS7221A-2A-A is a solid-state relay (SSR) manufactured by CEL, configured as a SPST-NO (Single Pole Single Throw - Normally Open) device with dual channels in an 8-SOP surface mount package. This component is rated for 170 mA load current across 0–260 V AC/DC output voltage with a 1.2 VDC input trigger voltage. The device operates with a maximum on-state resistance of 10 Ohms and features gull wing termination for automated assembly.

The PS7221A-2A-A is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production requirements, maintenance operations, and design continuity where this part is specified in existing schematics or bill of materials documentation.

Substiute Parts

PS7221A-2A-A

CELIn Stock: 1359PS7221A-2A-A Datasheet

Current PartRFQ

AQW210S

Panasonic Electric WorksIn Stock: 1491AQW210S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS7221A-2A-A is determined by the following critical parameters:

Functional Compatibility Requirements:

• Circuit configuration: SPST-NO (1 Form A) x 2 channels
• Package type: 8-SOP surface mount with gull wing termination
• Output capability: AC and DC switching
• Input trigger voltage: Compatible with 1.2 VDC control signal

Electrical Performance Boundaries:

• Load voltage range must encompass or exceed 0–260 V
• Load current capacity must meet or exceed 170 mA
• On-state resistance must not exceed specified maximum values that would degrade circuit performance

Physical and Environmental Constraints:

• Identical or functionally equivalent 8-SOP package footprint
• Surface mount compatibility with standard PCB assembly processes
• Moisture sensitivity level suitable for storage and handling conditions

The AQW210S from Panasonic Electric Works satisfies these substitution criteria through matching circuit topology, package geometry, and surface mount characteristics, while providing enhanced electrical performance specifications.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The AQW210S is a direct functional substitute for the PS7221A-2A-A based on matching circuit topology, package footprint, and surface mount characteristics. Both devices employ identical 8-SOP gull wing termination and support dual SPST-NO switching channels for AC and DC loads.

Product Status Consideration:

The PS7221A-2A-A is classified as obsolete, making the AQW210S the appropriate alternative for new procurement and ongoing production support. The AQW210S maintains active product status with Panasonic Electric Works, ensuring continued availability and supply chain stability.

Compliance and Regulatory Status:

Both components carry EAR99 export classification. The AQW210S holds ROHS3 compliance and REACH Unaffected status, providing enhanced regulatory alignment for applications subject to environmental and hazardous substance restrictions. The PS7221A-2A-A is REACH Affected, which may present supply chain or documentation requirements depending on end-use jurisdiction.

Electrical Performance Trade-offs:

The AQW210S provides superior load voltage capability (350 V versus 260 V) and lower input trigger voltage (1.14 VDC versus 1.2 VDC). However, the substitute exhibits reduced load current capacity (100 mA versus 170 mA) and higher on-state resistance (35 Ohms versus 10 Ohms). Circuit designs must verify that the 100 mA load current rating and 35 Ohm on-state resistance are acceptable for the intended application before substitution.

Frequently Asked Questions (FAQ)

Q: Can the AQW210S directly replace the PS7221A-2A-A without PCB modifications?

A: Yes. Both components use identical 8-SOP package geometry with gull wing termination. No PCB layout changes are required. Pin-to-pin compatibility is maintained for dual SPST-NO channel configuration.

Q: What are the critical differences between these two parts?

A: The primary differences are load current capacity (PS7221A-2A-A: 170 mA; AQW210S: 100 mA), on-state resistance (PS7221A-2A-A: 10 Ohms max; AQW210S: 35 Ohms max), and maximum load voltage (PS7221A-2A-A: 260 V; AQW210S: 350 V). Applications requiring the full 170 mA load current or lower on-state resistance may not be suitable for substitution.

Q: Is the input trigger voltage difference significant?

A: The input trigger voltage difference (1.2 VDC versus 1.14 VDC) is minimal and does not present compatibility issues for standard control circuits. Both values fall within typical logic-level signal ranges.

Q: Why does the AQW210S have higher on-state resistance?

A: The AQW210S is part of the PhotoMOS™ series, which uses optocoupler-based switching technology. This architecture results in higher on-state resistance compared to the PS7221A-2A-A. Circuit designs must account for increased voltage drop across the relay contacts.

Q: Are there packaging or storage differences?

A: The PS7221A-2A-A is supplied in standard packaging with MSL 1 (Unlimited) moisture sensitivity. The AQW210S is supplied in tube packaging. Both components have identical moisture sensitivity ratings and storage requirements.

Q: What compliance advantages does the AQW210S offer?

A: The AQW210S is ROHS3 compliant and REACH Unaffected, providing better alignment with environmental regulations in the European Union and other jurisdictions with hazardous substance restrictions. The PS7221A-2A-A is REACH Affected, which may require additional documentation or supply chain management.

Q: Can I use the AQW210S in applications requiring 170 mA load current?

A: No. The AQW210S is rated for a maximum of 100 mA load current. Applications requiring 170 mA must use the PS7221A-2A-A or identify alternative components with higher current ratings.

Q: Is the AQW210S suitable for high-voltage applications?

A: The AQW210S supports load voltages up to 350 V, which exceeds the PS7221A-2A-A specification of 260 V. This makes the AQW210S suitable for higher-voltage switching applications within its 100 mA current limit.