AQW254AX Equivalent & Substitute Parts

Part Overview

The AQW254AX is a solid-state relay (SSR) manufactured by Panasonic Electric Works, part of the PhotoMOS™ AQW series. This surface-mount SPST-NO (1 Form A) x 2 relay operates across AC and DC loads with a voltage range of 0–400V and a maximum load current of 120 mA. The component is actively produced and RoHS compliant, making it suitable for industrial control, switching, and signal isolation applications where mechanical relay alternatives are impractical. Equivalent and substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative sourcing options that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

AQW254AX

Panasonic Electric WorksIn Stock: 1006AQW254AX Datasheet

Current PartRFQ

PAA110LSTR

IXYS Integrated Circuits DivisionIn Stock: 20509PAA110LSTR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AQW254AX are identified based on strict electrical and mechanical compatibility criteria. The following parameters define the substitution scope:

Critical Matching Parameters:

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

Allowable Variation Parameters:

• Input voltage: Within compatible control circuit design (1.14–1.2 VDC range)
• Load current: Equal to or greater than 120 mA
• On-state resistance: Acceptable within application thermal and power dissipation limits
• RoHS compliance status: Active product status with current certifications

The PAA110LSTR (IXYS Integrated Circuits Division, OptoMOS® series) meets all critical matching parameters and represents a direct functional substitute with enhanced load current capability (150 mA vs. 120 mA) and equivalent voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

AQW254AX Selection Criteria:

• Primary choice when Panasonic PhotoMOS™ series qualification is required
• Preferred for applications with strict on-state resistance specifications (16 Ohms maximum)
• Suitable for designs with input voltage tolerance centered at 1.14 VDC
• Active product status with established supply chain and RoHS compliance

PAA110LSTR Selection Criteria:

• Alternative when load current margin is required (150 mA vs. 120 mA specification)
• Applicable when IXYS OptoMOS® series qualification is acceptable
• Suitable for applications tolerating higher on-state resistance (25 Ohms maximum)
• Active product status with ROHS3 compliance and MSL 1 rating
• Recommended when inventory availability or lead time favors IXYS sourcing

Both parts maintain identical package geometry, termination style, circuit configuration, and voltage specifications, ensuring direct PCB-level compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can PAA110LSTR replace AQW254AX in existing designs without PCB modification?

A: Yes. Both parts share identical package dimensions (8-SMD, 0.300" / 7.62mm), gull wing termination, and pinout configuration. No PCB layout changes are required for mechanical or electrical interface compatibility.

Q: What is the impact of the 9 Ohm difference in on-state resistance (16 Ohms vs. 25 Ohms)?

A: On-state resistance directly affects power dissipation and voltage drop across the relay contacts. At 120 mA load current, AQW254AX dissipates 230.4 mW (16 Ω × 120 mA²), while PAA110LSTR dissipates 360 mW (25 Ω × 120 mA²). Applications with tight thermal budgets or low-voltage switching must account for this 56% increase in dissipation when substituting.

Q: Are the input voltage specifications (1.14 VDC vs. 1.2 VDC) interchangeable?

A: Both input voltages fall within typical control circuit tolerance ranges. The 0.06 VDC difference is negligible for standard logic-level gate drive circuits. Verify that the control circuit design accommodates both specifications if switching between parts.

Q: What does MSL 1 (Unlimited) on PAA110LSTR mean compared to "Not Applicable" on AQW254AX?

A: MSL 1 indicates the PAA110LSTR has unlimited floor life and requires no special moisture-sensitive device (MSD) handling procedures. The AQW254AX designation of "Not Applicable" indicates it does not require MSD precautions. Both parts are suitable for standard manufacturing environments without special storage or handling protocols.

Q: Is the 30 mA higher load current rating on PAA110LSTR a design advantage?

A: The PAA110LSTR 150 mA rating provides 25% additional current margin above the AQW254AX 120 mA specification. This margin is beneficial for applications with transient load spikes or future design scaling, but does not alter the fundamental switching characteristics or response time of the relay.

Q: Are both parts RoHS compliant for regulated markets?

A: Yes. AQW254AX carries RoHS Compliant certification, and PAA110LSTR carries ROHS3 Compliant certification. Both meet current RoHS Directive requirements for EU and equivalent regulated markets. Verify specific regional compliance requirements for your application.