Equivalent & Substitute Parts for AQS221FN2S

Part Overview

The AQS221FN2S is a solid-state relay (SSR) manufactured by Panasonic Electric Works, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with quad output channels. This component is designed for switching applications requiring low input voltage control of AC and DC loads up to 40V at 60mA per channel. The AQS221FN2S is classified as obsolete, necessitating identification of equivalent substitute components for new designs or ongoing production requirements. Substitute parts must maintain functional compatibility across critical electrical parameters including load voltage range, current capacity, and input control voltage specifications.

Substiute Parts

AQS221FN2S

Panasonic Electric WorksIn Stock: 1510AQS221FN2S Datasheet

Current PartRFQ

AQS221N2S

Panasonic Electric WorksIn Stock: 2320AQS221N2S Datasheet

MFR RecommendedRFQ

AQY2C1R3PX

Panasonic Electric WorksIn Stock: 3587AQY2C1R3PX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AQS221FN2S are identified based on strict alignment with the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Load voltage range: 0 V ~ 40 V (must match or exceed)
• Output type: AC, DC capable
• Circuit configuration: SPST-NO relay function
• Mounting type: Surface Mount
• RoHS compliance status

Substitution Logic:

The AQS221N2S qualifies as a direct substitute based on identical load voltage range (0 V ~ 40 V), matching circuit configuration (SPST-NO x 4), identical load current capacity (60 mA), equivalent on-state resistance (12.5 Ohms), and identical package form factor (16-SOIC). The primary difference is the reduced input voltage requirement (1.25VDC vs. 1.3VDC), which represents an improvement in control sensitivity. This part is currently in active production status with enhanced RoHS3 compliance.

The AQY2C1R3PX represents a functional substitute with design trade-offs. While it maintains the identical load voltage range (0 V ~ 40 V) and SPST-NO circuit function, it differs in channel configuration (single channel vs. quad), increased load current capacity (100 mA vs. 60 mA), higher input voltage requirement (2.2VDC vs. 1.3VDC), and different package form factor (4-SMD vs. 16-SOIC). This part is suitable for applications where single-channel switching with higher current capacity is acceptable and package size constraints permit the smaller footprint.

Parameter Comparison

Engineering Selection Recommendations

AQS221N2S - Recommended Primary Substitute

The AQS221N2S is the preferred substitute for direct replacement of the obsolete AQS221FN2S. This part maintains identical electrical performance specifications (load voltage, current capacity, on-state resistance) and package form factor, enabling drop-in compatibility with existing PCB designs. The AQS221N2S is in active production status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The marginally lower input voltage requirement (1.25VDC vs. 1.3VDC) provides improved control margin without requiring circuit redesign.

AQY2C1R3PX - Alternative Substitute for Design Flexibility

The AQY2C1R3PX is suitable as a substitute when design modifications are acceptable. This part is in active production status with RoHS compliance. Selection of this part requires circuit redesign to accommodate single-channel operation instead of quad-channel configuration, higher input voltage control (2.2VDC), and different package footprint (4-SMD vs. 16-SOIC). The increased load current capacity (100 mA) provides additional margin for higher-power switching applications. This option is appropriate for new designs or redesign efforts where the smaller package footprint and higher current capacity provide system-level advantages.

Frequently Asked Questions (FAQ)

Q: Can AQS221N2S be used as a direct replacement for AQS221FN2S without PCB modification?

A: Yes. The AQS221N2S maintains identical package form factor (16-SOIC), pin configuration, and electrical performance specifications. No PCB layout changes are required for substitution.

Q: What are the key differences between AQS221N2S and AQY2C1R3PX?

A: The AQS221N2S provides quad-channel SPST-NO switching in a 16-SOIC package with 60mA per-channel capacity and 1.25VDC input voltage. The AQY2C1R3PX provides single-channel SPST-NO switching in a smaller 4-SMD package with 100mA capacity and 2.2VDC input voltage. Channel count and package form factor differ significantly; circuit redesign is required to use AQY2C1R3PX.

Q: Are both substitute parts RoHS compliant?

A: Yes. AQS221N2S carries ROHS3 certification. AQY2C1R3PX carries RoHS compliance certification. Both meet regulatory requirements for RoHS-restricted substance limitations.

Q: What is the impact of the different input voltage specifications (1.3VDC vs. 1.25VDC vs. 2.2VDC)?

A: The input voltage specification defines the control signal voltage required to activate the relay. AQS221N2S requires 1.25VDC (lower than the original 1.3VDC), providing improved control margin. AQY2C1R3PX requires 2.2VDC, which may require circuit modification if the control signal source is limited to lower voltages.

Q: Can AQY2C1R3PX replace a quad-channel requirement with four individual parts?

A: Functionally yes, but this approach requires significant PCB redesign to accommodate four separate 4-SMD packages instead of one 16-SOIC package. This solution increases board area, component count, and assembly complexity. Direct substitution with AQS221N2S is more practical for quad-channel applications.

Q: What is the significance of the on-state resistance difference (12.5 Ohms vs. 15 Ohms)?

A: On-state resistance affects voltage drop across the relay during load current conduction. The AQY2C1R3PX exhibits 20% higher on-state resistance (15 Ohms vs. 12.5 Ohms). For 60mA load current, this results in approximately 0.15V additional voltage drop. Applications with tight voltage margin requirements should account for this difference.

Q: Why is AQS221FN2S classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The AQS221N2S represents the active production equivalent, ensuring continued availability and supply chain stability for new designs and ongoing production requirements.