AQS221FN2SZ Equivalent & Substitute Parts

Part Overview

The AQS221FN2SZ is a Solid State SPST-NO (1 Form A) x 4 relay from Panasonic Electric Works' PhotoMOS™ AQS series, housed in a 16-SOIC package. This component is rated for 60 mA load current with a 0-40V load voltage range and 1.3VDC input voltage. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility for new designs or production continuity.

Substiute Parts

AQS221FN2SZ

Panasonic Electric WorksIn Stock: 755AQS221FN2SZ Datasheet

Current PartRFQ

AQS221N2SZ

Panasonic Electric WorksIn Stock: 915AQS221N2SZ Datasheet

MFR RecommendedRFQ

AQY2C1R3PX

Panasonic Electric WorksIn Stock: 3587AQY2C1R3PX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AQS221FN2SZ is determined by the following critical parameters:

• Circuit configuration (SPST-NO x 4 or compatible)
• Load voltage range (0-40V minimum)
• Load current capability (60 mA minimum)
• On-state resistance (12.5 Ohms maximum)
• Input voltage compatibility (1.3VDC nominal or lower)
• Package compatibility (16-SOIC or equivalent footprint)
• RoHS compliance status

Two substitute parts are identified:

AQS221N2SZ - Direct series equivalent with identical electrical specifications and package, differing only in product status (Active) and packaging format (Tape & Reel).

AQY2C1R3PX - Alternative series part with higher load current capability (100 mA) and different package form factor (4-SMD), requiring PCB layout modification but offering enhanced performance margin.

Parameter Comparison

Engineering Selection Recommendations

AQS221N2SZ is the primary recommended substitute. It maintains identical electrical specifications and package footprint as the AQS221FN2SZ, with the advantage of active product status ensuring long-term availability. The only difference is packaging format (Tape & Reel versus individual packaging), which does not affect electrical performance or PCB assembly compatibility. This part is suitable for direct replacement in existing designs without layout modification.

AQY2C1R3PX is an alternative substitute for applications where higher load current capability (100 mA versus 60 mA) provides design margin or where the smaller 4-SMD package footprint is advantageous. This part requires PCB layout redesign due to different package dimensions and termination style. The higher input voltage requirement (2.2VDC versus 1.3VDC) must be evaluated against available drive circuitry. This part is suitable only when PCB modification is feasible and the enhanced current rating is beneficial.

Both substitute parts are RoHS compliant and manufactured by Panasonic Electric Works, maintaining supply chain consistency and regulatory compliance with the original component.

Frequently Asked Questions (FAQ)

Q: Can AQS221N2SZ be used as a direct drop-in replacement for AQS221FN2SZ?

A: Yes. AQS221N2SZ is electrically and mechanically identical to AQS221FN2SZ. Both use the 16-SOIC package with gull wing termination, identical load voltage range (0-40V), load current (60 mA), and on-state resistance (12.5 Ohms maximum). The only difference is packaging format (Tape & Reel), which does not affect PCB assembly or performance.

Q: What are the key differences between AQS221N2SZ and AQY2C1R3PX?

A: AQS221N2SZ maintains the same electrical specifications as the original part (60 mA load current, 12.5 Ohms on-state resistance) in the same 16-SOIC package. AQY2C1R3PX offers higher load current (100 mA) but uses a smaller 4-SMD package, requires higher input voltage (2.2VDC versus 1.25VDC), and has slightly higher on-state resistance (15 Ohms). AQY2C1R3PX requires PCB layout modification.

Q: Is AQY2C1R3PX suitable for my application if I only need 60 mA load current?

A: AQY2C1R3PX can be used if the 100 mA rating provides acceptable design margin and the 4-SMD package footprint is compatible with your PCB layout. However, if your design is optimized for the 16-SOIC package and 60 mA is sufficient, AQS221N2SZ is the more direct replacement requiring no layout changes.

Q: Are both substitute parts RoHS compliant?

A: AQY2C1R3PX is explicitly RoHS compliant. AQS221N2SZ RoHS status is not specified in available documentation but is from the same manufacturer and series as the original RoHS-compliant part.

Q: What is the input voltage requirement difference between these parts?

A: AQS221FN2SZ and AQS221N2SZ both require 1.3VDC and 1.25VDC input respectively. AQY2C1R3PX requires 2.2VDC input. If your drive circuit supplies 1.3VDC, AQS221N2SZ is the appropriate choice. If 2.2VDC is available, AQY2C1R3PX is compatible.