LAA126 Solid State Relay SPST-NO 170mA 0-250V Equivalent & Substitute Parts

Part Overview

The LAA126 is a solid state relay (SSR) manufactured by IXYS Integrated Circuits Division, featuring SPST-NO (1 Form A) configuration in an 8-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The LAA126 operates with a 1.2VDC input signal and supports load voltages from 0V to 250V with a maximum load current of 170mA, suitable for AC and DC switching applications.

Substiute Parts

LAA126

IXYS Integrated Circuits DivisionIn Stock: 3453LAA126 Datasheet

Current PartRFQ

LAA127

IXYS Integrated Circuits DivisionIn Stock: 1829LAA127 Datasheet

DirectRFQ

AQW213EH

Panasonic Electric WorksIn Stock: 20281AQW213EH Datasheet

MFR RecommendedRFQ

LH1522AB

Vishay Semiconductor Opto DivisionIn Stock: 23556LH1522AB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LAA126 is determined by strict compatibility across the following parameters:

• Package / Case: Must be 8-DIP (0.300", 7.62mm) for direct PCB compatibility
• Circuit Configuration: Must be SPST-NO (1 Form A) x 2 for functional equivalence
• Mounting Type: Must be Through Hole to match assembly requirements
• Termination Style: Must be PC Pin for connection compatibility
• Output Type: Must support both AC and DC switching
• Voltage - Load Range: Must accommodate 0V ~ 250V or higher
• Load Current: Must meet or exceed 170mA requirement
• Input Voltage: Must be compatible with 1.2VDC control signal

Three substitute parts meet these criteria with varying performance characteristics and product status classifications.

Parameter Comparison

Engineering Selection Recommendations

LAA127 is the primary direct substitute for the LAA126. Both components are manufactured by IXYS within the same LAA OptoMOS® series and share identical package, circuit configuration, and voltage specifications. The LAA127 provides superior performance with 200mA load current capacity (exceeding the LAA126's 170mA requirement) and reduced on-state resistance of 10 Ohms versus 15 Ohms. The LAA127 holds Active product status and is ROHS3 Compliant, making it suitable for new designs and long-term availability.

AQW213EH (Panasonic Electric Works PhotoMOS™ AQW series) is a cross-manufacturer substitute meeting all package and circuit requirements. This part operates with a slightly lower input voltage (1.14VDC) and maintains full 0V ~ 250V load voltage range. However, the load current rating of 120mA is below the LAA126's 170mA specification. The AQW213EH is RoHS Compliant and carries Active product status with high inventory availability.

LH1522AB (Vishay Semiconductor Opto Division LH1522 series) is a cross-manufacturer substitute with identical package and circuit configuration. The load voltage range is limited to 0V ~ 200V, which is 50V below the LAA126's maximum. Load current is rated at 120mA, below the LAA126 requirement. The LH1522AB is ROHS3 Compliant with Active product status.

For applications requiring the full 170mA load current at 250V, LAA127 is the recommended substitute. For applications with reduced current requirements (≤120mA), AQW213EH or LH1522AB provide alternative sources with active product status and modern compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can LAA127 directly replace LAA126 in existing designs?

A: Yes. LAA127 shares identical package (8-DIP), circuit configuration (SPST-NO x 2), mounting type (Through Hole), and voltage specifications (1.2VDC input, 0V ~ 250V load) with LAA126. The LAA127 provides enhanced performance with higher load current capacity (200mA vs. 170mA) and lower on-state resistance (10 Ohms vs. 15 Ohms), making it a direct functional upgrade.

Q: What are the load current limitations when using AQW213EH or LH1522AB?

A: Both AQW213EH and LH1522AB are rated for 120mA maximum load current. These substitutes are suitable only for applications where the load current requirement does not exceed 120mA. If your application requires 170mA or higher, LAA127 is the appropriate substitute.

Q: Does LH1522AB support the full 250V load voltage range?

A: No. LH1522AB is rated for 0V ~ 200V load voltage, which is 50V below the LAA126's 250V maximum. Applications requiring operation above 200V load voltage must use LAA127 or AQW213EH, both of which support 0V ~ 250V.

Q: Are all substitute parts RoHS compliant?

A: LAA127, AQW213EH, and LH1522AB all meet RoHS compliance requirements. LAA127 and LH1522AB are ROHS3 Compliant. AQW213EH is RoHS Compliant. The original LAA126 does not specify RoHS status.

Q: What is the input voltage tolerance across substitute parts?

A: Input voltages are 1.2VDC (LAA126, LAA127), 1.14VDC (AQW213EH), and 1.26VDC (LH1522AB). All values are within typical control signal ranges and are compatible with standard logic-level drivers.

Q: Can I use multiple substitute parts interchangeably in the same application?

A: No. Substitution must be based on specific application requirements. LAA127 is the direct equivalent for full-specification replacement. AQW213EH and LH1522AB are suitable only when load current does not exceed 120mA. LH1522AB additionally requires load voltage not to exceed 200V.