Equivalent & Substitute Parts for TD1225 Solid State Relay

Part Overview

The TD1225 is a Sensata-Crydom solid state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 25A load current and 24–140V output voltage range. The device features zero-cross switching capability and operates with 3–32VDC input control voltage. Currently in Last Time Buy status, the TD1225 requires identification of equivalent and substitute components to support ongoing procurement and system design requirements.

Substiute Parts

TD1225

Sensata-CrydomIn Stock: 1065TD1225 Datasheet

Current PartRFQ

84134910

Sensata-CrydomIn Stock: 66884134910 Datasheet

DirectRFQ

D1225

Sensata-CrydomIn Stock: 2395D1225 Datasheet

DirectRFQ

84137910N

CrouzetIn Stock: 76884137910N Datasheet

SimilarRFQ

ASR-SI240D25ZW-L

Altran Magnetics, LLCIn Stock: 728ASR-SI240D25ZW-L Datasheet

SimilarRFQ

SSR-240D25

TE Connectivity Potter & Brumfield RelaysIn Stock: 7387SSR-240D25 Datasheet

SimilarRFQ

SSRT-240D25

TE Connectivity Potter & Brumfield RelaysIn Stock: 1216SSRT-240D25 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TD1225 is determined by the following critical parameters:

Core Compatibility Requirements:

• Circuit configuration: SPST-NO (1 Form A)
• Load current rating: 25 A minimum
• Package / case: Hockey Puck form factor
• Mounting type: Chassis Mount
• Termination style: Screw Terminal
• Input voltage range: Must accommodate 3–32 VDC control signal
• Output voltage range: Must support minimum 24–140 V operation

Substitution Categories:

Direct Substitutes maintain identical electrical and mechanical specifications to the TD1225:

• D1225 (Sensata-Crydom Series 1): Identical output voltage range (24–140 V), zero-cross switching, and all mechanical parameters. Active product status.

Compatible Substitutes exceed the TD1225 output voltage range while maintaining all other critical parameters:

• 84134910 (Sensata-Crydom GNA5): Supports 24–280 V output range; input voltage and load current identical. Active status.
• SSR-240D25 (TE Connectivity Potter & Brumfield): Supports 24–280 V output range; zero-cross switching maintained. Active status.
• SSRT-240D25 (TE Connectivity Potter & Brumfield): Supports 24–280 V output range; zero-cross switching maintained. Active status.

Similar Substitutes introduce minor parameter variations requiring engineering evaluation:

• 84137910N (Crouzet GNA): Supports 24–280 V output range; input voltage range 4–32 VDC (minimum 4V vs. 3V); zero-cross switching maintained. RoHS Compliant (not ROHS3).
• ASR-SI240D25ZW-L (Altran Magnetics SI): Supports 48–280 V output range (minimum 48V vs. 24V); input voltage range 4–32 VDC; zero-cross switching maintained.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: D1225

The D1225 (Sensata-Crydom Series 1) is the optimal direct substitute for the TD1225. It maintains identical electrical specifications (24–140 V output range, 3–32 VDC input, 25 A load current) and zero-cross switching functionality. Both parts are ROHS3 Compliant and feature identical mechanical packaging (Hockey Puck, Chassis Mount, Screw Terminal). The D1225 holds Active product status with 2,300 units in stock, ensuring long-term availability and supply chain continuity.

Secondary Recommendations: SSR-240D25 and SSRT-240D25

Both TE Connectivity Potter & Brumfield relays (SSR-240D25 and SSRT-240D25) provide compatible substitution with extended output voltage capability (24–280 V). These parts maintain zero-cross switching, identical input voltage range (3–32 VDC), and 25 A load current rating. Both are ROHS3 Compliant and Active products. The SSR-240D25 offers the highest inventory availability (7,366 units), supporting high-volume procurement requirements.

Tertiary Recommendation: 84134910

The 84134910 (Sensata-Crydom GNA5) serves as an alternative within the Sensata-Crydom product family. It supports extended output voltage range (24–280 V) while maintaining 3–32 VDC input compatibility and 25 A load current. ROHS3 Compliant and Active status. Note: This part does not specify zero-cross switching in the output type designation.

Conditional Recommendations: 84137910N and ASR-SI240D25ZW-L

The 84137910N (Crouzet GNA) and ASR-SI240D25ZW-L (Altran Magnetics SI) introduce parameter variations requiring application-level evaluation:

• 84137910N: Minimum input voltage requirement of 4 VDC (vs. 3 VDC for TD1225) may limit compatibility in low-voltage control circuits. RoHS Compliant status (not ROHS3) may affect regulatory compliance in specific markets.

• ASR-SI240D25ZW-L: Minimum output voltage of 48 V (vs. 24 V for TD1225) restricts application to higher-voltage load circuits. Minimum input voltage of 4 VDC applies the same constraint as 84137910N.

Frequently Asked Questions (FAQ)

Q: Can the D1225 be used as a direct replacement for the TD1225 in all applications?

A: Yes. The D1225 maintains identical electrical and mechanical specifications to the TD1225, including output voltage range (24–140 V), input voltage range (3–32 VDC), load current (25 A), zero-cross switching, and Hockey Puck package configuration. No circuit modifications are required.

Q: What is the advantage of using SSR-240D25 or SSRT-240D25 over the D1225?

A: Both TE Connectivity relays support an extended output voltage range of 24–280 V, compared to the TD1225 and D1225 range of 24–140 V. This extended range accommodates higher-voltage load applications while maintaining all other electrical and mechanical compatibility. Both parts retain zero-cross switching functionality.

Q: Why does the 84134910 not specify zero-cross switching?

A: The 84134910 (Sensata-Crydom GNA5) is listed with output type "AC" without explicit zero-cross designation. Applications requiring zero-cross switching for noise reduction or EMI control should prioritize D1225, SSR-240D25, SSRT-240D25, 84137910N, or ASR-SI240D25ZW-L.

Q: Can the 84137910N or ASR-SI240D25ZW-L be used in circuits with 3 VDC control voltage?

A: No. Both the 84137910N and ASR-SI240D25ZW-L specify a minimum input voltage of 4 VDC, whereas the TD1225 operates from 3 VDC. Applications requiring 3 VDC control signal compatibility must use D1225, 84134910, SSR-240D25, or SSRT-240D25.

Q: Is the ASR-SI240D25ZW-L compatible with 24 V load circuits?

A: No. The ASR-SI240D25ZW-L specifies a minimum output voltage of 48 V. Applications requiring 24 V load switching must use TD1225, D1225, 84134910, SSR-240D25, SSRT-240D25, or 84137910N.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant status?

A: ROHS3 Compliant indicates compliance with the Restriction of Hazardous Substances Directive 3 (2015/863/EU), which includes restrictions on phthalate plasticizers in addition to the original six restricted substances. RoHS Compliant (without ROHS3 designation) indicates compliance with the original RoHS Directive. Applications subject to ROHS3 regulatory requirements should prioritize parts with ROHS3 Compliant status.

Q: Are all substitute parts available in the same packaging format as the TD1225?

A: All substitute parts use the Hockey Puck package configuration and Chassis Mount installation method. However, packaging type differs: TD1225, D1225, SSR-240D25, and SSRT-240D25 are supplied in Bulk packaging, while 84137910N and ASR-SI240D25ZW-L are supplied in Box packaging. This distinction affects receiving, storage, and inventory management procedures but does not affect component functionality.

Q: Which substitute part offers the highest inventory availability?

A: The SSR-240D25 (TE Connectivity Potter & Brumfield) offers the highest inventory availability with 7,366 units in stock, followed by D1225 with 2,300 units. For high-volume procurement or extended supply chain requirements, SSR-240D25 provides optimal availability.