PLA190 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The PLA190 is an IXYS OptoMOS® solid state relay (SSR) configured as a SPST-NO (Single Pole Single Throw - Normally Open) switching device. This 6-DIP through-hole component is designed for AC and DC load switching applications up to 400V with a maximum load current of 150mA. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

PLA190

IXYS Integrated Circuits DivisionIn Stock: 1159PLA190 Datasheet

Current PartRFQ

LH1500AT

Vishay Semiconductor Opto DivisionIn Stock: 8757LH1500AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PLA190 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Package / Case: Must be 6-DIP (0.300", 7.62mm) for direct PCB compatibility without layout modifications
• Mounting Type: Must be Through Hole to ensure mechanical fit in existing board designs
• Load Current: Must support minimum 150mA continuous operation
• Voltage - Load Range: Must accommodate the full 0V ~ 400V operating window or a subset thereof
• Output Type: Must support both AC and DC switching capability
• Termination Style: Must be PC Pin for direct solder compatibility
• Input Voltage: Must be compatible with 1.2VDC control signal (±10% tolerance typical for SSR inputs)

The LH1500AT from Vishay Semiconductor Opto Division meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the PLA190 and LH1500AT are active production components with ROHS3 compliance and identical moisture sensitivity ratings, making either suitable for new designs or replacement scenarios. The primary technical distinction is the maximum load voltage specification: the PLA190 supports 0V ~ 400V operation, while the LH1500AT is rated to 0V ~ 350V. Selection between these parts should be based on the actual load voltage requirements of the application. If the design requires switching loads above 350V, the PLA190 is the appropriate choice. For applications operating at or below 350V, the LH1500AT offers equivalent performance with a lower on-state resistance (20 Ohms vs. 22 Ohms), resulting in reduced power dissipation. Both parts carry identical regulatory approvals relevant to their respective manufacturers and are suitable for direct substitution within the voltage constraints noted.

Frequently Asked Questions (FAQ)

Q: Can the LH1500AT replace the PLA190 in all applications?

A: The LH1500AT is a direct substitute for PLA190 applications where the load voltage does not exceed 350V. If your design requires switching loads above 350V, the PLA190 must be used. Both parts are pin-compatible 6-DIP packages with identical circuit configurations and load current ratings.

Q: What is the significance of the input voltage difference (1.2VDC vs. 1.25VDC)?

A: The 0.05VDC difference between the PLA190 (1.2VDC) and LH1500AT (1.25VDC) input specifications is within typical SSR control signal tolerances and does not affect practical substitution. Standard logic-level control circuits will operate both devices reliably.

Q: Are there any package or pinout differences between these parts?

A: No. Both the PLA190 and LH1500AT use identical 6-DIP (0.300", 7.62mm) packaging with PC pin termination. No PCB layout modifications are required for substitution.

Q: What does the lower on-state resistance of the LH1500AT (20 Ohms vs. 22 Ohms) mean for my application?

A: Lower on-state resistance reduces power dissipation during load switching. At 150mA load current, the LH1500AT dissipates approximately 0.45W compared to 0.495W for the PLA190. This difference is typically negligible in most applications but may be relevant in thermally constrained designs.

Q: Are both parts RoHS compliant?

A: Yes. Both the PLA190 and LH1500AT are ROHS3 compliant with unlimited moisture sensitivity (MSL 1), making them suitable for standard PCB assembly and storage conditions.

Q: Can I use these parts for AC and DC load switching?

A: Yes. Both the PLA190 and LH1500AT support AC and DC output switching across their respective voltage ranges, providing design flexibility for mixed-signal applications.