Sensata-Crydom A4808 SSR Relay Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom A4808 is a solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 8A load current at 80–530V AC output. This component features a hockey puck form factor with screw terminal connections and zero-cross switching capability. The A4808 is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

A4808

Sensata-CrydomIn Stock: 773A4808 Datasheet

Current PartRFQ

A4825

Sensata-CrydomIn Stock: 869A4825 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A4808 is determined by strict equivalence across the following electrical and mechanical parameters:

• Circuit Configuration: Must remain SPST-NO (1 Form A)
• Output Type: Must maintain AC, Zero Cross switching
• Input Voltage Range: Must support 90–280VAC
• Load Voltage Range: Must support 80–530V
• Package Form Factor: Must be Hockey Puck
• Termination: Must use Screw Terminal
• Mounting: Must be Chassis Mount

The A4825 qualifies as a direct substitute based on these criteria. While the A4825 provides higher load current capacity (25A versus 8A), this represents an uprated capability within the same functional family and does not compromise compatibility in applications designed for the A4808's 8A rating.

Parameter Comparison

Engineering Selection Recommendations

The A4825 is the qualified substitute for the obsolete A4808. Both components share identical electrical specifications for input voltage, load voltage range, circuit topology, and switching characteristics. The A4825 maintains active product status, ensuring continued availability and supply chain reliability.

The A4825 carries ROHS3 compliance and REACH Affected status, reflecting current regulatory requirements. Applications currently using the A4808 may transition to the A4825 without modification to control logic or load interface design, provided the application load current does not exceed 8A (the original A4808 rating). The higher current rating of the A4825 provides design margin and does not introduce incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the A4825 directly replace the A4808 in existing assemblies?

A: Yes. Both components share identical input voltage, load voltage, circuit configuration, package form factor, and termination style. The A4825 is mechanically and electrically compatible with the A4808 footprint and control interface.

Q: Why does the A4825 have a higher current rating than the A4808?

A: The A4825 is an uprated variant within the same A48 series. Higher current capacity does not affect compatibility; applications designed for 8A operation remain fully functional with the A4825.

Q: What is the significance of the A4825 being ROHS3 compliant while the A4808 status is not specified?

A: The A4825 meets current environmental and hazardous substance restrictions. For new designs or systems requiring regulatory compliance documentation, the A4825 provides verified ROHS3 certification.

Q: Are there differences in thermal or mechanical mounting between the A4808 and A4825?

A: Both components use identical hockey puck form factor, chassis mount configuration, and screw terminal termination. No mechanical redesign or thermal management changes are required for substitution.

Q: What is the REACH Affected status on the A4825?

A: REACH Affected indicates the component is subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. This is standard for active components and does not affect functional compatibility or performance.