CTA17 Solid State Relay SPST-NO

Part Overview

The CTA17 is a Solid State Relay (SSR) manufactured by Coto Technology in the COTOMOS™ series, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with 1 Form A output. This component is rated for 120 mA load current at 0-350 V AC/DC operation with a 1.2 VDC input trigger. The CTA17 is classified as obsolete; identifying suitable substitute components is necessary to maintain system compatibility and ensure continued availability for new designs or component replacement.

Substiute Parts

CTA17

Coto TechnologyIn Stock: 1072CTA17 Datasheet

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PLA110

IXYS Integrated Circuits DivisionIn Stock: 2139PLA110 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CTA17 is based on electrical and mechanical compatibility within the following parameters:

Critical Substitution Parameters:

• Circuit Configuration: SPST-NO (1 Form A) required
• Input Voltage: 1.2 VDC trigger level
• Output Type: AC, DC capability
• Load Voltage Rating: Must support minimum 0-350 V (350 V minimum)
• Load Current Rating: Must support minimum 120 mA (120 mA minimum)
• Package: Through Hole DIP configuration with PC Pin termination
• RoHS Status: ROHS3 Compliant required

The PLA110 satisfies all substitution criteria with equivalent or superior electrical ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

The PLA110 is a direct functional equivalent to the CTA17 and is qualified as a suitable substitute component. The PLA110 offers superior electrical performance with higher load voltage (400 V vs. 350 V) and load current ratings (150 mA vs. 120 mA), along with reduced on-state resistance (22 Ohms vs. 30 Ohms). Both parts meet ROHS3 compliance and maintain the required input voltage (1.2 VDC) and circuit configuration (SPST-NO 1 Form A).

The primary design consideration is package footprint: the CTA17 uses an 8-DIP configuration while the PLA110 uses a 6-DIP configuration. Both maintain the 0.300" (7.62 mm) pitch and Through Hole PC Pin termination style, requiring PCB layout modification to accommodate the reduced pin count. The PLA110's active product status and superior MSL rating (1 vs. 2) provide advantages for long-term component availability and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the PLA110 directly replace the CTA17 without PCB modification? A: The PLA110 requires PCB layout modification due to package differences (6-DIP vs. 8-DIP). Both components maintain the same 0.300" DIP pitch and Through Hole termination, but the reduced pin count necessitates design changes.

Q: Are the electrical specifications compatible between CTA17 and PLA110? A: Yes. The PLA110 meets and exceeds all electrical requirements: input voltage (1.2 VDC), circuit configuration (SPST-NO 1 Form A), load voltage (400 V minimum vs. 350 V requirement), and load current (150 mA vs. 120 mA requirement).

Q: What is the impact of the lower on-state resistance in the PLA110? A: The PLA110's on-state resistance of 22 Ohms is lower than the CTA17's 30 Ohms maximum, resulting in reduced power dissipation and improved thermal performance. This represents an improvement for the application.

Q: Does the MSL difference between the two parts affect substitution? A: The PLA110 has a superior MSL rating (1 vs. 2), indicating better moisture resistance and unlimited shelf life compared to the CTA17's 1-year limit. This improves supply chain flexibility and component storage conditions.

Q: Are both components RoHS compliant? A: Yes, both the CTA17 and PLA110 are ROHS3 Compliant, meeting regulatory requirements for hazardous substance restrictions.