D1225T Solid State Relay - Equivalent & Substitute Parts

Part Overview

The D1225T is a solid state relay (SSR) manufactured by Sensata Technologies, designed for single-pole single-throw normally open (SPST-NO) switching applications. This active product operates as a 1 Form A relay with zero-cross AC output capability, rated for 25A load current across a 24V to 140V operating range. The device features a hockey puck form factor with screw terminal connections and chassis mount configuration. Equivalent parts are identified to support applications requiring extended voltage ranges, alternative sourcing, or inventory availability while maintaining core electrical and mechanical compatibility.

Substiute Parts

D1225T

Sensata TechnologiesIn Stock: 1253D1225T Datasheet

Current PartRFQ

84137910N

CrouzetIn Stock: 76884137910N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the D1225T is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Output Type: Must support AC with zero-cross switching for compatible load control
• Load Current Rating: Must be rated for minimum 25A continuous operation
• Package / Case: Must be hockey puck form factor to ensure mechanical fit in existing mounting locations
• Termination Style: Must use screw terminal connections for direct connection compatibility
• Mounting Type: Must support chassis mount configuration
• Input Voltage Range: Must accommodate 3 ~ 32VDC control signal range
• Load Voltage Range: Must support minimum 24V operation; extended upper range acceptable

The substitute part 84137910N (Crouzet GNA series) meets all substitution criteria. It maintains identical circuit configuration, output type, load current rating, package form factor, termination style, and mounting type. The input voltage range (4 ~ 32VDC) is compatible with the D1225T specification, and the extended load voltage range (24V ~ 280V) provides broader application flexibility while remaining backward compatible.

Parameter Comparison

Engineering Selection Recommendations

Both the D1225T and 84137910N are active products with RoHS compliance certification, suitable for current design implementations. Selection between these parts should be based on:

D1225T (Sensata Technologies): Primary selection for applications operating within the 24V to 140V load voltage specification. Sensata Technologies manufacturing provides established supply chain presence.

84137910N (Crouzet): Suitable for applications requiring load voltage operation up to 280V, providing extended operating range within the same 25A current rating and identical form factor. The minimum input voltage specification of 4VDC (versus 3VDC for D1225T) represents a negligible practical difference in most 24VDC control signal applications. Crouzet manufacturing offers alternative sourcing for inventory management or supply continuity.

Both parts maintain identical electrical switching characteristics, mechanical form factor, and regulatory compliance status, enabling direct substitution within the specified parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can the 84137910N replace the D1225T in existing applications?

A: Yes, the 84137910N is a direct substitute for the D1225T. Both parts share identical circuit configuration (SPST-NO), output type (AC zero-cross), load current rating (25A), package form factor (hockey puck), termination style (screw terminal), and mounting type (chassis mount). The 84137910N's extended load voltage range (24V ~ 280V) is backward compatible with D1225T applications operating within 24V to 140V.

Q: What is the significance of the input voltage difference (3VDC vs. 4VDC minimum)?

A: The D1225T specifies a 3VDC minimum input threshold, while the 84137910N specifies 4VDC. In practical applications using standard 24VDC control signals, this 1VDC difference is negligible and does not affect compatibility or performance.

Q: Are both parts suitable for new designs?

A: Yes. Both the D1225T and 84137910N are active products with current manufacturing status and RoHS compliance certification, making either suitable for new design implementations.

Q: What determines whether a part can substitute for the D1225T?

A: Substitution eligibility requires matching the following parameters: SPST-NO circuit configuration, AC zero-cross output type, 25A load current rating, hockey puck package form factor, screw terminal termination, and chassis mount configuration. The substitute part must support minimum 24V load voltage operation and accommodate the 3 ~ 32VDC input voltage range.

Q: Can parts with different package types substitute for the D1225T?

A: No. The hockey puck form factor is a critical mechanical specification. Parts with alternative package types (such as DIP, surface mount, or other form factors) are not suitable substitutes, as they will not fit existing mounting locations and connector interfaces.

Q: What is the significance of the load voltage range extension in the 84137910N?

A: The 84137910N's extended load voltage range (24V ~ 280V versus 24V ~ 140V) allows operation in applications requiring higher load voltages while maintaining the same 25A current rating. This extended capability is fully backward compatible with D1225T applications and does not introduce any compatibility issues.