LAA125LSTR Equivalent & Substitute Parts

Part Overview

The LAA125LSTR is a solid-state relay (SSR) manufactured by IXYS Integrated Circuits Division, part of the OptoMOS® series. This SPST-NO (1 Form A) x 2 configuration operates across 0–350V load voltage with 150mA maximum load current and 18Ω on-state resistance. The device is housed in an 8-SMD (0.300", 7.62mm) surface-mount package with gull-wing termination and is supplied in Tape & Reel packaging. The LAA125LSTR maintains Active product status and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and package standardization to support design flexibility and supply chain continuity.

Substiute Parts

LAA125LSTR

IXYS Integrated Circuits DivisionIn Stock: 670LAA125LSTR Datasheet

Current PartRFQ

AQW210EHAZ

Panasonic Electric WorksIn Stock: 3957AQW210EHAZ Datasheet

MFR RecommendedRFQ

AQW210HLAZ

Panasonic Electric WorksIn Stock: 20326AQW210HLAZ Datasheet

MFR RecommendedRFQ

LH1520AACTR

Vishay Semiconductor Opto DivisionIn Stock: 1336LH1520AACTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LAA125LSTR are qualified based on the following criteria:

Electrical Compatibility:

• Circuit configuration: SPST-NO (1 Form A) x 2
• Load voltage range: 0 V ~ 350 V (all substitutes match this specification)
• Output type: AC, DC operation
• Input voltage: 1.2VDC nominal (substitutes operate within 1.14–1.26VDC range)
• Load current: Substitutes rated at 110–120mA (within acceptable operating margin relative to 150mA primary specification)
• On-state resistance: Substitutes rated at 20–25Ω (acceptable variance for SSR applications)

Mechanical Compatibility:

• Package: 8-SMD (0.300", 7.62mm) — all substitutes use identical package
• Termination: Gull Wing — all substitutes match
• Mounting: Surface Mount — all substitutes match
• Supplier Device Package: 8-SMD — all substitutes match

Compliance & Status:

• Product Status: All substitutes are Active
• RoHS Compliance: All substitutes are ROHS3 or RoHS Compliant
• REACH Status: All substitutes are REACH Unaffected
• ECCN Classification: All substitutes classified as EAR99
• HTSUS Code: All substitutes classified as 8536.41.0030

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—AQW210EHAZ, AQW210HLAZ, and LH1520AACTR—maintain Active product status and meet ROHS3 or RoHS compliance requirements. The AQW210HLAZ variant offers the highest inventory availability (20,300 pcs) and is suitable for high-volume applications. The AQW210EHAZ provides an alternative Panasonic PhotoMOS™ option with 3,862 pcs in stock. The LH1520AACTR from Vishay offers a third-source alternative with 1,294 pcs available and maintains MSL 1 (Unlimited) rating consistent with the primary part.

Selection between substitutes should account for load current requirements: the LAA125LSTR is rated for 150mA, while substitutes are rated at 110–120mA. Applications requiring the full 150mA specification should retain the LAA125LSTR. For applications operating below 120mA, all substitutes are electrically compatible. On-state resistance variance (18Ω primary vs. 20–25Ω substitutes) is acceptable for standard SSR switching applications. Input voltage tolerance across all parts (1.14–1.26VDC) is within typical control circuit specifications.

Frequently Asked Questions (FAQ)

Q: Can AQW210EHAZ or AQW210HLAZ directly replace LAA125LSTR in existing designs?

A: Both Panasonic PhotoMOS™ AQW parts are mechanically and electrically compatible for applications operating at or below 120mA load current. The identical 8-SMD (0.300", 7.62mm) package with gull-wing termination ensures PCB footprint compatibility. Load current derating from 150mA to 120mA must be evaluated against circuit requirements.

Q: What is the difference between AQW210EHAZ and AQW210HLAZ?

A: Both parts are PhotoMOS™ AQW series devices with identical electrical specifications (1.14VDC input, 120mA load current, 25Ω on-state resistance, 0–350V load voltage). The primary distinction is inventory availability: AQW210HLAZ has significantly higher stock (20,300 pcs vs. 3,862 pcs for AQW210EHAZ). Both are RoHS compliant with Not Applicable MSL rating.

Q: Is the LH1520AACTR suitable for applications requiring MSL 1 (Unlimited) rating?

A: Yes. The LH1520AACTR maintains MSL 1 (Unlimited) moisture sensitivity level, matching the LAA125LSTR specification. This makes it suitable for applications with extended storage or high-humidity environments where MSL rating is a design requirement.

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

A: The LAA125LSTR specifies 18Ω maximum on-state resistance, while substitutes range from 20–25Ω. This variance results in proportionally higher voltage drop across the relay during conduction. For 150mA load current, the LAA125LSTR produces maximum 2.7V drop; substitutes produce 2.2–3.75V drop. Circuit design must accommodate this variance or operate at reduced load currents where substitutes are rated.

Q: Are all substitute parts REACH compliant?

A: Yes. All substitute parts—AQW210EHAZ, AQW210HLAZ, and LH1520AACTR—are classified as REACH Unaffected, matching the LAA125LSTR specification.

Q: Can substitutes be used in AC and DC switching applications?

A: Yes. All substitute parts support AC and DC output type operation, identical to the LAA125LSTR. Load voltage range (0–350V) is consistent across all parts for both AC and DC applications.