XCA170STR Equivalent & Substitute Parts

Part Overview

The XCA170STR is a solid-state relay (SSR) manufactured by IXYS Integrated Circuits Division, designed for SPST-NO (Single Pole Single Throw - Normally Open) switching applications. This OptoMOS® series component operates with a 1.2VDC input signal and supports AC/DC loads up to 350V at 100mA maximum current. The device is currently in active production status with 30,318 units available in inventory.

Substitute parts become necessary when the XCA170STR reaches end-of-life status, when supply constraints occur, or when design requirements necessitate alternative electrical characteristics such as higher load current capacity or lower on-state resistance.

Substiute Parts

XCA170STR

IXYS Integrated Circuits DivisionIn Stock: 30420XCA170STR Datasheet

Current PartRFQ

LH1550AAB1TR

Vishay Semiconductor Opto DivisionIn Stock: 5258LH1550AAB1TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the XCA170STR is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Circuit configuration: SPST-NO (1 Form A)
• Package type: 6-SMD (0.300", 7.62mm)
• Termination style: Gull Wing
• Load voltage range: 0V ~ 350V
• Output type: AC, DC capable
• Mounting type: Surface Mount

Allowable Variation Parameters:

• Input voltage: Within compatible control signal range
• Load current: Equal to or greater than 100mA
• On-state resistance: Equal to or lower than 50 Ohms
• RoHS compliance: ROHS3 Compliant

The LH1550AAB1TR qualifies as a substitute part because it maintains identical circuit configuration, package dimensions, termination style, load voltage range, and output type. The LH1550AAB1TR provides enhanced electrical performance with 120mA load current capacity and 28 Ohms maximum on-state resistance, both superior to the XCA170STR specifications.

Parameter Comparison

Engineering Selection Recommendations

The XCA170STR remains the primary selection for new designs due to its active product status and established supply chain. The LH1550AAB1TR is classified as obsolete and should be selected only when the XCA170STR is unavailable or when the enhanced electrical performance characteristics (higher load current and lower on-state resistance) are required for the application.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring compatibility with modern manufacturing and environmental standards. The LH1550AAB1TR carries multiple approval agencies (cUL, DIN, FIMKO, UL), providing additional certification coverage for regulated applications.

The 0.05VDC difference in input voltage (1.2VDC vs. 1.25VDC) is within typical control signal tolerances and does not restrict substitution in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the LH1550AAB1TR directly replace the XCA170STR in existing designs?

A: Yes. Both parts share identical circuit configuration (SPST-NO), package dimensions (6-SMD 0.300"), termination style (Gull Wing), load voltage range (0-350V), and output type (AC/DC). The LH1550AAB1TR provides equal or superior electrical performance.

Q: What is the significance of the LH1550AAB1TR being classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. The XCA170STR should be prioritized for new designs requiring assured long-term availability.

Q: Are there differences in thermal or operating temperature specifications between these parts?

A: The LH1550AAB1TR specifies an operating temperature range of -40°C to 85°C. The XCA170STR operating temperature range is not provided in the available technical parameters. Verify temperature requirements against your specific application before substitution.

Q: How do the on-state resistance values affect circuit performance?

A: The LH1550AAB1TR on-state resistance of 28 Ohms is significantly lower than the XCA170STR maximum of 50 Ohms. Lower on-state resistance reduces power dissipation and heat generation in the relay, improving efficiency and reliability in current-limited applications.

Q: Are both parts suitable for AC and DC load switching?

A: Yes. Both the XCA170STR and LH1550AAB1TR are rated for AC and DC output types, supporting flexible load switching applications across both signal types.