LDA110 Optoisolator Equivalent & Substitute Parts

Part Overview

The LDA110 is an optoisolator with Darlington output and base connection, rated for 3750Vrms isolation voltage. Manufactured by IXYS Integrated Circuits Division, this component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The 6-DIP through-hole package and specific electrical characteristics define the substitution criteria for this component category.

Substiute Parts

LDA110

IXYS Integrated Circuits DivisionIn Stock: 2102LDA110 Datasheet

Current PartRFQ

IL755-1

Vishay Semiconductor Opto DivisionIn Stock: 1348IL755-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LDA110 is determined by the following critical parameters:

Mechanical Compatibility: Package type (6-DIP), pin count (6), and through-hole mounting must remain identical to ensure PCB compatibility without layout modifications.

Functional Compatibility: Output configuration must be Darlington with base connection. Single-channel operation is required. Input type must support both AC and DC signals.

Electrical Compatibility: Isolation voltage must meet or exceed 3750Vrms. Maximum output voltage must be at least 30V. Vce saturation must not exceed 1V. Operating temperature range must encompass or extend the original -40°C to 85°C specification.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status must be maintained.

The IL755-1 meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The IL755-1 is a direct functional substitute for the LDA110 based on package compatibility, output configuration, and regulatory compliance. Both components are ROHS3 compliant and REACH unaffected.

The IL755-1 provides enhanced electrical performance: isolation voltage is increased to 5300Vrms (versus 3750Vrms), maximum output voltage is 60V (versus 30V), and operating temperature range extends to -55°C to 100°C (versus -40°C to 85°C). These improvements ensure the substitute part meets or exceeds the original specification requirements.

The IL755-1 carries Last Time Buy status, indicating limited future availability. Procurement planning should account for this status when selecting this substitute for new designs or long-term production support.

Frequently Asked Questions (FAQ)

Q: Can the IL755-1 replace the LDA110 in existing PCB designs?

A: Yes. Both components use identical 6-DIP (0.300", 7.62mm) through-hole packaging with the same pin configuration. No PCB layout modifications are required.

Q: What are the key electrical differences between these parts?

A: The IL755-1 provides higher isolation voltage (5300Vrms versus 3750Vrms), higher maximum output voltage (60V versus 30V), and an extended operating temperature range (-55°C to 100°C versus -40°C to 85°C). Vce saturation remains identical at 1V maximum.

Q: Are both parts RoHS compliant?

A: Yes. Both the LDA110 and IL755-1 are ROHS3 compliant and REACH unaffected.

Q: Why is the LDA110 listed as obsolete?

A: The LDA110 is no longer manufactured by IXYS Integrated Circuits Division. The IL755-1 from Vishay Semiconductor Opto Division is the recommended substitute for continued system support.

Q: What is the significance of the IL755-1's Last Time Buy status?

A: Last Time Buy status indicates that Vishay will discontinue production of the IL755-1 after a specified date. Customers requiring this component should plan procurement accordingly and consider long-term inventory needs.

Q: Are the current transfer ratios compatible between these parts?

A: The LDA110 specifies 300% minimum and 30000% maximum current transfer ratio at 1mA. The IL755-1 specifies 750% minimum at 2mA. Both parts operate as Darlington optoisolators with base output, but at different measurement conditions. Circuit design should account for these specifications independently.