CPC44055ST Equivalent & Substitute Parts

Part Overview

The CPC44055ST is a solid-state relay (SSR) manufactured by IXYS Integrated Circuits Division, configured as a SPST-NO (1 Form A) relay in a 4-SIP package. This component is rated for 5A load current with an operating voltage range of 0–800V AC and features zero-cross switching capability. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications.

Substiute Parts

CPC44055ST

IXYS Integrated Circuits DivisionIn Stock: 901CPC44055ST Datasheet

Current PartRFQ

CPC40055ST

LittelfuseIn Stock: 778132CPC40055ST Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CPC44055ST is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: SPST-NO (1 Form A) topology must be maintained
• Load Voltage Range: 0–800 V AC operation capability
• Load Current Rating: 5 A minimum
• Output Type: AC with zero-cross switching
• Package / Case: 4-SIP form factor
• Mounting Type: Through Hole
• Termination Style: PC Pin

The CPC40055ST, manufactured by Littelfuse, meets all substitution criteria. While the input voltage specification differs (1.2 VDC vs. 9–16 VDC), this represents a design improvement in the substitute part and does not prevent functional equivalence in applications where the lower input voltage is compatible with the control circuit.

Parameter Comparison

Engineering Selection Recommendations

The CPC40055ST is the direct substitute for the obsolete CPC44055ST. Both components share identical electrical ratings for load voltage, load current, circuit configuration, and output switching characteristics. The substitute part is manufactured by Littelfuse and maintains active product status, ensuring ongoing availability and supply chain continuity.

The CPC40055ST carries RoHS3 compliance certification, providing environmental and regulatory advantages over the original part. Both components are REACH unaffected and classified under identical ECCN and HTSUS codes, confirming regulatory equivalence.

The difference in input voltage specification (1.2 VDC for the substitute versus 9–16 VDC for the original) should be evaluated against the control circuit design. In applications where the control voltage is 1.2 VDC or can be adapted to this level, the substitute part offers superior performance characteristics. In systems requiring 9–16 VDC input, alternative solutions within the CPC series should be consulted.

Frequently Asked Questions (FAQ)

Q: Can the CPC40055ST directly replace the CPC44055ST in existing PCB designs?

A: Yes, provided the control circuit can supply 1.2 VDC input voltage. Both parts use identical 4-SIP through-hole packaging with PC pin termination, ensuring mechanical and electrical compatibility at the board level.

Q: What is the significance of the "Zero Cross" output type?

A: Zero-cross switching ensures the relay transitions at the AC voltage zero-crossing point, minimizing electromagnetic interference and reducing inrush current stress on connected loads. Both the original and substitute parts maintain this capability.

Q: Are there compliance differences between the two parts?

A: The CPC40055ST includes RoHS3 compliance certification, whereas the CPC44055ST does not specify this status. Both parts are REACH unaffected and share identical ECCN and HTSUS classifications.

Q: What should be verified before implementing the CPC40055ST as a substitute?

A: Confirm that the control circuit can operate at 1.2 VDC input voltage. Verify that the load voltage and current requirements remain within the 0–800 V and 5 A specifications. Confirm PCB layout accommodates the 4-SIP through-hole footprint.

Q: Is the CPC40055ST available in alternative packaging formats?

A: The substitute part is supplied in Tube packaging. Confirm packaging requirements for your procurement and assembly processes.