DC100A40 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The DC100A40 is a Solid State Relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (1 Form A) relay in a Hockey Puck package. This component is rated for 40A load current with input voltage range of 90–140VAC and output voltage range of 1–72VDC. The product is currently classified as Obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and component procurement.

Substiute Parts

DC100A40

Sensata-CrydomIn Stock: 952DC100A40 Datasheet

Current PartRFQ

DC100D40

Sensata-CrydomIn Stock: 962DC100D40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DC100A40 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A)
• Output Type: Must be DC
• Load Current Rating: Must be 40 A
• Load Voltage Range: Must support 1 V – 72 V
• On-State Resistance: Must not exceed 7 mOhms
• Package / Case: Must be Hockey Puck
• Mounting Type: Must be Chassis Mount
• Termination Style: Must be Screw Terminal

The DC100D40 meets all these criteria and is therefore a direct functional equivalent. The primary distinction is the input voltage specification: the DC100A40 accepts 90–140VAC input, while the DC100D40 accepts 4–32VDC input. This difference reflects different control signal sources but does not affect the output switching characteristics or load-handling capability.

Parameter Comparison

Engineering Selection Recommendations

The DC100D40 is the direct substitute for the DC100A40. Both components are manufactured by Sensata-Crydom within the PowerPlus DC series and share identical electrical and mechanical specifications for load switching performance.

The DC100D40 is currently in Active product status, whereas the DC100A40 is Obsolete. For new designs or system replacements, the DC100D40 is the appropriate selection. The DC100D40 additionally carries ROHS3 compliance certification, meeting current environmental and regulatory requirements.

The functional difference between these parts lies exclusively in the input control signal specification: the DC100A40 requires 90–140VAC control input, while the DC100D40 requires 4–32VDC control input. Selection between these parts depends on the available control signal source in the application circuit. If the control signal is AC mains voltage, the DC100A40 is required. If the control signal is low-voltage DC, the DC100D40 is appropriate.

Frequently Asked Questions (FAQ)

Q: Can the DC100D40 directly replace the DC100A40 in an existing circuit?

A: The DC100D40 is electrically and mechanically equivalent for load switching. However, it requires a different control input signal (4–32VDC instead of 90–140VAC). Direct replacement is possible only if the control signal source in the circuit can be modified to supply DC voltage within the specified range.

Q: What is the significance of the Hockey Puck package?

A: The Hockey Puck package is a specific mechanical form factor for chassis-mounted solid state relays. Both the DC100A40 and DC100D40 use this package, ensuring identical mounting footprint and thermal interface characteristics.

Q: Why is the DC100A40 listed as Obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production. The DC100D40 is the active replacement within the PowerPlus DC series and should be used for new procurements and system designs.

Q: Are there any compliance differences between these parts?

A: The DC100D40 carries ROHS3 compliance certification. Both parts are REACH Unaffected and classified under ECCN EAR99. For applications requiring RoHS compliance, the DC100D40 is the appropriate selection.

Q: What does On-State Resistance of 7 mOhms mean for my application?

A: On-State Resistance is the electrical resistance of the relay when conducting current. Both parts have identical maximum on-state resistance of 7 mOhms, meaning they will produce equivalent voltage drops and heat dissipation at the same load current levels.