LAA126S Equivalent & Substitute Parts

Part Overview

The LAA126S is a solid-state relay (SSR) manufactured by IXYS Integrated Circuits Division, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with dual channels in an 8-SMD surface mount package. This component operates with a 1.2VDC input signal and supports AC/DC loads up to 250V at 170mA maximum current. The LAA126S is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

LAA126S

IXYS Integrated Circuits DivisionIn Stock: 1095LAA126S Datasheet

Current PartRFQ

LAA127S

IXYS Integrated Circuits DivisionIn Stock: 2131LAA127S Datasheet

DirectRFQ

AQW213EHA

Panasonic Electric WorksIn Stock: 1192AQW213EHA Datasheet

MFR RecommendedRFQ

LH1522AAC

Vishay Semiconductor Opto DivisionIn Stock: 1316LH1522AAC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LAA126S is determined by the following critical parameters:

• Package Compatibility: All substitutes must use the 8-SMD (0.300", 7.62mm) surface mount package with gull wing termination to ensure PCB footprint compatibility.
• Circuit Configuration: All substitutes must maintain SPST-NO (1 Form A) x 2 dual-channel configuration.
• Input Voltage: Substitutes must accept control signals within the 1.2VDC range (tolerance: ±0.14VDC acceptable).
• Load Voltage Range: Substitutes must support 0V to 250V load operation for AC and DC outputs.
• Load Current Capability: Substitutes must support minimum 170mA load current; higher ratings are acceptable.
• On-State Resistance: Lower on-state resistance values indicate improved performance and are acceptable substitutes.

Three qualified substitutes meet these criteria: LAA127S (IXYS, same series, higher current rating), AQW213EHA (Panasonic PhotoMOS™, active product), and LH1522AAC (Vishay, active product).

Parameter Comparison

Engineering Selection Recommendations

LAA127S is the primary substitute for the LAA126S. Both components are from the same IXYS OptoMOS® series with identical package and circuit configuration. The LAA127S is an active product with improved specifications: 200mA load current (exceeding the 170mA requirement) and 10 Ohms maximum on-state resistance (improved from 15 Ohms). Input voltage tolerance remains within acceptable range at 1.2VDC. This substitute provides direct compatibility with existing PCB designs.

AQW213EHA (Panasonic PhotoMOS™ AQW series) is a qualified substitute with active product status and RoHS compliance. The input voltage of 1.14VDC is within acceptable tolerance of the LAA126S specification. However, the load current rating of 120mA is below the original 170mA specification. This substitute is suitable only for applications where the actual load current does not exceed 120mA.

LH1522AAC (Vishay LH1522 series) is a qualified substitute with active product status and ROHS3 compliance. The input voltage of 1.26VDC is within acceptable tolerance. The load current rating of 120mA is below the original 170mA specification, and the maximum load voltage is 200V (compared to 250V for the LAA126S). This substitute is suitable only for applications where load current does not exceed 120mA and load voltage does not exceed 200V.

Frequently Asked Questions (FAQ)

Q: Can LAA127S directly replace LAA126S without PCB modifications?

A: Yes. The LAA127S shares identical package dimensions (8-SMD 0.300" / 7.62mm), termination style (gull wing), circuit configuration (SPST-NO x 2), and input voltage specification (1.2VDC) with the LAA126S. No PCB layout changes are required.

Q: Why do AQW213EHA and LH1522AAC have lower load current ratings than LAA126S?

A: These substitutes are from different manufacturer series (Panasonic PhotoMOS™ and Vishay LH1522 respectively) with different internal semiconductor designs. Their 120mA load current rating is a design characteristic of these product lines. They remain valid substitutes for applications where the actual load current requirement does not exceed 120mA.

Q: Is the load voltage difference between LH1522AAC (200V max) and LAA126S (250V max) significant?

A: The LH1522AAC maximum load voltage of 200V is a design specification of the Vishay LH1522 series. This substitute is suitable only for applications where the load voltage does not exceed 200V. For applications requiring 200V to 250V operation, LAA127S or AQW213EHA are appropriate choices.

Q: What is the input voltage tolerance for these substitutes?

A: The LAA126S specifies 1.2VDC input. Acceptable substitutes operate at 1.14VDC (AQW213EHA) to 1.26VDC (LH1522AAC), representing a tolerance band of approximately ±0.12VDC. All three substitutes fall within this acceptable range for control signal compatibility.

Q: Are all substitutes RoHS compliant?

A: LAA127S is ROHS3 compliant. AQW213EHA is RoHS compliant. LH1522AAC is ROHS3 compliant. All three substitutes meet current RoHS requirements.