IS621 Optoisolator Triac Output Equivalent & Substitute Parts

Part Overview

The IS621 is an optoisolator with triac output manufactured by Isocom Components 2004 LTD, designed for galvanic isolation applications requiring high voltage isolation. This 6-pin DIP component features a 5300Vrms isolation rating with zero-crossing detection capability. The part is currently in active production status with 2252 units available in stock. Substitute parts are identified when equivalent electrical performance, isolation voltage, output type, and package configuration are maintained across the specified operating parameters.

Substiute Parts

IS621

Isocom Components 2004 LTDIn Stock: 2323IS621 Datasheet

Current PartRFQ

IL410

Vishay Semiconductor Opto DivisionIn Stock: 2457IL410 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IS621 is determined by strict equivalence across the following critical parameters:

• Isolation voltage rating of 5300Vrms
• Triac output configuration
• Single channel architecture
• Zero-crossing detection capability
• 6-DIP through-hole package format (0.300", 7.62mm)
• Off-state voltage rating of 600V
• Operating temperature range compatibility
• RoHS3 compliance status

The IL410 manufactured by Vishay Semiconductor Opto Division meets these substitution criteria. Both parts share identical isolation voltage, output type, channel count, zero-crossing functionality, and package specifications. Differences in secondary parameters such as static dV/dt rating, LED trigger current, and turn-on time do not disqualify substitution when the primary functional requirements are met.

Parameter Comparison

Engineering Selection Recommendations

Both IS621 and IL410 are active production components with ROHS3 compliance. The IL410 provides enhanced performance characteristics including superior static dV/dt rating (10kV/µs versus 600V/µs), lower LED trigger current requirement (2mA versus 15mA), and an extended operating temperature range (-55°C to 100°C versus -40°C to 100°C). The IL410 carries CSA and UR certifications, while the IS621 carries UL and VDE certifications. Selection between these parts depends on specific application requirements regarding regulatory approval bodies and performance specifications. Both parts maintain functional equivalence for 5300Vrms triac-output isolation applications in 6-DIP through-hole configurations.

Frequently Asked Questions (FAQ)

Q: Can IL410 directly replace IS621 in existing designs? A: Both parts share identical isolation voltage (5300Vrms), output type (triac), channel count (1), zero-crossing capability, and 6-DIP package format. Functional substitution is supported based on these core parameters. Verification of certification requirements (UL/VDE versus CSA/UR) and performance specification compatibility with your application is necessary.

Q: What are the key differences between IS621 and IL410? A: The IL410 features a higher static dV/dt rating (10kV/µs), lower LED trigger current (2mA), wider operating temperature range (-55°C to 100°C), and different regulatory certifications (CSA/UR instead of UL/VDE). These represent performance enhancements rather than functional incompatibilities.

Q: Are both parts available in the same package? A: Yes. Both IS621 and IL410 are manufactured in 6-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations, enabling direct PCB layout compatibility.

Q: Which certifications apply to each part? A: IS621 carries UL and VDE approvals. IL410 carries CSA and UR approvals. Application requirements may dictate which certification set is necessary for your end product.

Q: What is the inventory status for these parts? A: IS621 has 2252 units in stock. IL410 has 2355 units in stock, both listed as new original inventory.