ILQ66-4 Equivalent & Substitute Parts

Part Overview

The ILQ66-4 is a 4-channel optoisolator with Darlington output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage and is designed for applications requiring high-voltage signal isolation with Darlington output configuration in a 16-DIP through-hole package.

The ILQ66-4 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and system maintenance.

Substiute Parts

ILQ66-4

Vishay Semiconductor Opto DivisionIn Stock: 8053ILQ66-4 Datasheet

Current PartRFQ

ILQ32

Vishay Semiconductor Opto DivisionIn Stock: 4998ILQ32 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ILQ66-4 is determined by the following critical parameters that must remain consistent:

• Number of Channels: 4 channels required
• Voltage - Isolation: 5300Vrms isolation voltage
• Output Type: Darlington output configuration
• Package / Case: 16-DIP (0.300", 7.62mm) through-hole mounting
• Input Type: DC input
• Operating Temperature Range: -55°C ~ 100°C
• RoHS Compliance: ROHS3 Compliant

The ILQ32 qualifies as a direct substitute because it maintains all critical isolation, channel count, output type, and package specifications. Both parts share identical isolation voltage, Darlington output topology, 4-channel configuration, and 16-DIP packaging.

Parameter Comparison

Engineering Selection Recommendations

The ILQ32 is the qualified substitute for the ILQ66-4. Both components are manufactured by Vishay Semiconductor Opto Division and maintain identical isolation voltage, channel configuration, output type, and package specifications.

The ILQ32 holds Last Time Buy status, indicating limited future availability. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The ILQ32 provides specified output current capability of 125mA per channel and reduced maximum output voltage of 30V compared to the ILQ66-4's 60V rating. Circuit designs must account for these output parameter differences during substitution.

Frequently Asked Questions (FAQ)

Q: Can the ILQ32 directly replace the ILQ66-4 in all applications?

A: The ILQ32 maintains identical isolation voltage (5300Vrms), channel count (4), output type (Darlington), and package (16-DIP). However, the ILQ32 has a maximum output voltage of 30V versus the ILQ66-4's 60V. Applications requiring output voltages above 30V cannot use the ILQ32 as a substitute.

Q: What are the key differences between these parts?

A: The primary differences are maximum output voltage (ILQ66-4: 60V, ILQ32: 30V), current transfer ratio test conditions (ILQ66-4: 500% @ 2mA, ILQ32: 500% @ 10mA), specified output current per channel (ILQ32: 125mA), and product status (ILQ66-4: Obsolete, ILQ32: Last Time Buy).

Q: Are both parts pin-compatible?

A: Both parts use the 16-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and electrical pin compatibility.

Q: Do both parts meet current compliance standards?

A: Both the ILQ66-4 and ILQ32 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the operating temperature range for both parts?

A: Both parts operate across the identical temperature range of -55°C to 100°C.