D4808 Solid State Relay SPST-NO 8A 80-530V Equivalent & Substitute Parts

Part Overview

The D4808 is a solid state relay (SSR) manufactured by Sensata-Crydom, configured as a single-pole single-throw normally open (SPST-NO) device with an 8A load current rating and 80-530V output voltage range. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The D4808 operates with 3-32VDC input control voltage and features zero-cross AC output switching with screw terminal connections in a hockey puck package format.

Substiute Parts

D4808

Sensata-CrydomIn Stock: 1108D4808 Datasheet

Current PartRFQ

D4825

Sensata-CrydomIn Stock: 1466D4825 Datasheet

DirectRFQ

84134100

Sensata TechnologiesIn Stock: 106384134100 Datasheet

MFR RecommendedRFQ

SSR-480D25

TE Connectivity Potter & Brumfield RelaysIn Stock: 1026SSR-480D25 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the D4808 is determined by the following critical parameters:

Circuit Configuration: All substitute parts must maintain SPST-NO (1 Form A) topology to ensure functional equivalence in control applications.

Output Type: AC zero-cross switching capability must be preserved across all substitutes to maintain synchronization with AC load cycles.

Mounting Type & Package: All candidates must use chassis mount configuration with hockey puck package format for mechanical compatibility.

Termination Style: Screw terminal connections are required for direct replacement without additional wiring modifications.

Input Voltage Range: Substitute parts must accept the 3-32VDC control signal range of the original circuit.

Load Voltage & Current Ratings: Substitutes may exceed the original 8A/80-530V ratings, as higher-rated devices remain compatible with lower-load applications. However, load voltage range must overlap or exceed the original specification to ensure adequate margin.

Three substitute parts meet these criteria: D4825 (Sensata-Crydom, 25A), 84134100 (Sensata Technologies, 10A), and SSR-480D25 (TE Connectivity, 25A).

Parameter Comparison

Engineering Selection Recommendations

D4825 (Sensata-Crydom, 25A): This part maintains identical load voltage range (80-530V) and input voltage specifications as the D4808, with increased current capacity. Product status is active with ROHS3 compliance. This represents the closest functional equivalent within the Sensata-Crydom product line.

84134100 (Sensata Technologies, 10A): This part provides a 10A current rating with expanded load voltage range (48-660V), exceeding the original 80-530V specification. Product status is active with ROHS3 compliance and MSL rating of 1 (Unlimited). The lower minimum load voltage (48V vs. 80V) expands application flexibility.

SSR-480D25 (TE Connectivity Potter & Brumfield, 25A): This part offers 25A capacity with expanded load voltage range (48-660V). Product status is active with ROHS3 compliance and MSL rating of 1 (Unlimited). Cross-manufacturer substitution introduces supply chain diversification.

All three substitutes are active products with current manufacturing status and modern compliance certifications, addressing the obsolescence of the D4808.

Frequently Asked Questions (FAQ)

Q: Can the D4825 directly replace the D4808 in existing applications?

A: Yes. The D4825 maintains identical input voltage range (3-32VDC), load voltage range (80-530V), circuit configuration (SPST-NO), output type (AC zero-cross), mounting type (chassis mount), termination style (screw terminal), and package format (hockey puck). The increased 25A current rating does not affect compatibility with 8A load applications.

Q: What is the primary difference between the D4825 and 84134100?

A: The D4825 maintains the original 80-530V load voltage range, while the 84134100 expands this to 48-660V. The D4825 provides 25A capacity versus 10A for the 84134100. Both are functionally equivalent for the D4808 application, with selection based on load voltage requirements and current margin preferences.

Q: Why does the SSR-480D25 have a different load voltage range (48-660V) than the D4808 (80-530V)?

A: The SSR-480D25 is manufactured by TE Connectivity and represents a different product series (SSR) within the solid state relay category. The expanded 48-660V range provides broader application coverage while remaining compatible with the original 80-530V operating window. The lower minimum voltage (48V) extends usability to lower-voltage AC circuits.

Q: Are all three substitutes mechanically compatible with D4808 mounting locations?

A: Yes. All three substitutes use identical mounting type (chassis mount) and package format (hockey puck) with screw terminal connections, ensuring direct mechanical compatibility without enclosure or wiring modifications.

Q: What compliance advantages do the active substitutes offer over the obsolete D4808?

A: All three active substitutes carry ROHS3 compliance certification, addressing modern environmental and hazardous substance restrictions. The D4825 and 84134100 are REACH Affected, indicating compliance with current chemical safety regulations. The SSR-480D25 includes MSL rating of 1 (Unlimited), providing moisture sensitivity documentation for storage and handling requirements.

Q: Can I use the 84134100 in applications requiring the full 80-530V load voltage range?

A: Yes. The 84134100 load voltage range of 48-660V encompasses the original 80-530V specification, providing full compatibility. The expanded range does not affect performance within the original operating window.