PS7241-1A-A Equivalent & Substitute Parts

Part Overview

The PS7241-1A-A is a solid-state relay (SSR) manufactured by CEL, configured as a SPST-NO (1 Form A) device in a 4-SOP package. This component operates with a load voltage range of 0–400V and supports a maximum load current of 120mA, making it suitable for low-voltage AC/DC switching applications. The product is classified as obsolete, necessitating identification of equivalent or substitute components for ongoing design requirements and system maintenance.

Key Parameters

Parameter	Specification
Manufacturer Part Number	PS7241-1A-A
Manufacturer	CEL
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, DC
Voltage - Input	1.2VDC
Voltage - Load	0 V ~ 400 V
Load Current	120 mA
On-State Resistance (Max)	30 Ohms
Package / Case	4-SOP (0.173", 4.40mm)
Mounting Type	Surface Mount
Termination Style	Gull Wing
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PS7241-1A-A is based on the following critical parameters that must remain compatible:

Core Compatibility Requirements:

Circuit Configuration: SPST-NO (1 Form A)
Output Type: AC, DC
Input Voltage: Approximately 1.14–1.2VDC (slight variation acceptable)
Load Voltage Range: Minimum 0–400V (≥400V required for full compatibility)
Load Current: Minimum 120mA (equal or greater)
On-State Resistance: ≤35 Ohms (acceptable variance for electrical performance)
Package / Case: 4-SOP or 6-SOP (0.173", 4.40mm footprint)
Mounting Type: Surface Mount, Gull Wing termination
Product Status: Active preferred (obsolete alternatives viable for legacy systems)

Substitute parts are grouped based on their ability to meet the core load voltage and current requirements while maintaining electrical and mechanical compatibility. Parts with reduced load voltage ratings or load currents below 120mA are listed but require application-specific evaluation for derating scenarios.

Parameter Comparison

Part Number	Manufacturer	Load Voltage (V)	Load Current (mA)	On-State Resistance (Ohms)	Package	Product Status	RoHS Status
PS7241-1A-A	CEL	0–400	120	30	4-SOP	Obsolete	REACH Affected
AQV210S	Panasonic Electric Works	0–350	120	35	6-SOP	Active	RoHS3 Compliant
AQV214S	Panasonic Electric Works	0–400	100	50	6-SOP	Active	RoHS3 Compliant
AQV217S	Panasonic Electric Works	0–200	160	15	6-SOP	Active	RoHS3 Compliant
AQV224NS	Panasonic Electric Works	0–400	40	100	6-SOP	Active	RoHS3 Compliant
AQV227NS	Panasonic Electric Works	0–200	50	50	6-SOP	Active	RoHS3 Compliant
AQY210S	Panasonic Electric Works	0–350	120	25	4-SOP	Active	RoHS3 Compliant
AQY214S	Panasonic Electric Works	0–400	100	35	4-SOP	Active	RoHS3 Compliant
TLP176GA(F)	Toshiba Semiconductor and Storage	0–400	120	35	4-SOP	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Full Electrical & Mechanical Compatibility):

The AQY210S and TLP176GA(F) are the closest functional equivalents to the PS7241-1A-A. Both parts maintain the 4-SOP package configuration, support 120mA load current, operate within 0–350V load voltage range (TLP176GA(F) extends to 0–400V), and feature active product status with current RoHS/REACH compliance. AQY210S exhibits superior on-state resistance (25 Ohms vs. 30 Ohms original), reducing heat dissipation and improving efficiency. TLP176GA(F) matches the full 0–400V load voltage specification and maintains equivalent electrical characteristics.

Secondary Substitutes (Package Transition Required):

AQV210S and AQV214S provide active-status alternatives from Panasonic's PhotoMOS™ AQV series but require PCB layout modification due to 6-SOP package transition. AQV214S supports the full 0–400V load voltage specification but operates at reduced load current (100mA versus 120mA original), suitable only for applications with lower current requirements or derating margins. Both parts feature RoHS3 compliance and high inventory availability.

Application-Specific Alternatives:

AQV217S is suitable only for applications with maximum load voltage of 0–200V and supports increased load current (160mA). AQV227NS and AQV224NS are restricted to 0–200V and 0–400V load voltage ranges, respectively, with significantly reduced load current ratings (50mA and 40mA), limiting their use to low-power switching scenarios.

Compliance Considerations:

All Panasonic PhotoMOS™ variants (AQV and AQY series) maintain RoHS3 compliance and REACH unaffected status, supporting modern supply chain and environmental requirements. The PS7241-1A-A original part is REACH affected and obsolete; migration to active substitutes is recommended for new designs and long-term system support.

Frequently Asked Questions (FAQ)

Q: Can AQY210S directly replace PS7241-1A-A in existing PCB designs? A: Yes. AQY210S maintains the 4-SOP package footprint, gull wing termination, and 120mA load current specification. The part offers improved on-state resistance (25 Ohms vs. 30 Ohms), providing enhanced electrical performance in the original circuit topology without layout modifications.

Q: What is the primary difference between AQV and AQY series substitutes? A: AQV series uses 6-SOP packaging, while AQY series uses 4-SOP packaging. For PS7241-1A-A replacement, the AQY series (AQY210S, AQY214S) maintains the original 4-SOP form factor, eliminating redesign complexity. Selection depends on PCB layout constraints and available routing space.

Q: Is TLP176GA(F) suitable for all PS7241-1A-A applications? A: Yes. TLP176GA(F) matches the full 0–400V load voltage specification and 120mA current rating in a 4-SOP package. Input voltage (1.15VDC) is compatible with the original 1.2VDC specification. The part maintains RoHS compliance and active product status, supporting both legacy and new designs.

Q: Which substitute has the lowest on-state resistance? A: AQV217S exhibits the lowest on-state resistance at 15 Ohms; however, this part is limited to 0–200V load voltage and 160mA current, restricting it to low-voltage applications. For applications requiring the full 0–400V rating, AQY210S (25 Ohms) provides the best resistance performance.

Q: Can I use AQV214S if my application only requires 100mA load current? A: AQV214S is suitable for applications with maximum load current of 100mA and load voltage up to 0–400V. The 6-SOP package requires PCB redesign. Applications designed for 120mA operation must not use this part without confirming reduced current requirements and system margin analysis.

Q: How does load voltage rating affect substitute selection? A: The PS7241-1A-A supports 0–400V load voltage. Substitutes with reduced voltage ratings (AQV210S and AQY210S at 0–350V; AQV217S and AQV227NS at 0–200V) are usable only in applications where the load voltage does not exceed the part's maximum rating. Full-specification replacements include AQV214S, AQY214S, AQV224NS, and TLP176GA(F), all rated 0–400V.

Q: Are there REACH or RoHS compliance concerns with these substitutes? A: The original PS7241-1A-A is REACH affected and does not carry RoHS certification. All Panasonic alternatives (AQV and AQY series) are RoHS3 compliant and REACH unaffected, meeting current environmental regulations. TLP176GA(F) is RoHS compliant, supporting modern supply chain requirements.

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