ISP621-4 Equivalent & Substitute Parts

Part Overview

The ISP621-4 is a 4-channel optoisolator with 5.3kV isolation rating, manufactured by Isocom Components 2004 LTD in 16-DIP through-hole packaging. This component is actively produced and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

ISP621-4

Isocom Components 2004 LTDIn Stock: 855ISP621-4 Datasheet

Current PartRFQ

ILQ621

Vishay Semiconductor Opto DivisionIn Stock: 1810ILQ621 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ILQ621 qualifies as a direct substitute based on the following alignment of critical parameters:

• Number of Channels: Both parts feature 4 channels
• Isolation Voltage: Both rated at 5300Vrms (5.3kV)
• Package Type: Both use 16-DIP through-hole configuration
• Output Type: Both employ transistor output architecture
• Input Type: Both accept DC input
• Compliance: Both are ROHS3 compliant with MSL 1 rating
• Regulatory: Both carry EAR99 ECCN classification and REACH Unaffected status
• Product Status: Both are actively manufactured

Parameter Comparison

Engineering Selection Recommendations

Both the ISP621-4 and ILQ621 maintain active production status and full compliance with ROHS3 and REACH regulations. Selection between these parts is determined by availability, lead time, and supply chain requirements rather than electrical or mechanical constraints. The identical 16-DIP package footprint, isolation voltage rating, channel count, and output architecture ensure direct functional equivalence in circuit applications. Both components carry MSL 1 classification, indicating no moisture sensitivity restrictions during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the ILQ621 be used as a direct replacement for the ISP621-4 in existing designs?

A: Yes. Both parts share identical channel count (4), isolation voltage (5.3kV), package type (16-DIP), output architecture (transistor), and input type (DC). No circuit modifications are required.

Q: Are there any differences in pin configuration between these parts?

A: Both parts use the 16-DIP package with 0.300" (7.62mm) body width. Pin assignments are equivalent for 4-channel optoisolator applications.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the ISP621-4 and ILQ621 are ROHS3 compliant, REACH unaffected, carry EAR99 ECCN classification, and maintain MSL 1 moisture sensitivity rating.

Q: What is the basis for substitution between these parts?

A: Substitution is based on matching electrical parameters (isolation voltage, channel count, output type, input type) and mechanical compatibility (package type, mounting method). Both parts are actively produced.

Q: Are there any performance differences in isolation voltage or channel configuration?

A: No. Both parts are rated at 5300Vrms isolation voltage and feature 4 independent channels with identical output transistor architecture.