ISP621-4BL Equivalent & Substitute Parts

Part Overview

The ISP621-4BL is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin DIP component provides galvanic isolation up to 5300Vrms across four independent channels, each capable of 50mA output current. The part is classified as Active status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when identical electrical and mechanical specifications are maintained across all critical parameters, ensuring direct functional equivalence in circuit applications.

Substiute Parts

ISP621-4BL

Isocom Components 2004 LTDIn Stock: 652ISP621-4BL Datasheet

Current PartRFQ

ISP621-4XBL

Isocom Components 2004 LTDIn Stock: 816ISP621-4XBL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISP621-4BL are identified based on strict equivalence across all electrical and mechanical parameters. The substitution criteria include:

• Identical number of channels (4)
• Matching isolation voltage rating (5300Vrms)
• Equivalent current transfer ratio range (200% to 600% @ 5mA)
• Same output type (Transistor)
• Identical maximum output voltage (55V) and channel current (50mA)
• Matching saturation voltage specification (400mV maximum)
• Same operating temperature range (-30°C ~ 100°C)
• Identical package configuration (16-DIP, 0.300", 7.62mm)
• Equivalent compliance certifications (RoHS3, REACH Unaffected)

Only parts meeting all these criteria are classified as parametric equivalents suitable for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The ISP621-4XBL is a direct parametric equivalent to the ISP621-4BL. Both parts maintain identical electrical specifications across all critical parameters including isolation voltage, current transfer ratio, output characteristics, and operating temperature range. Both components carry Active product status and full RoHS3 compliance certification, confirming ongoing manufacturing support and regulatory alignment. Selection between these parts may be based on inventory availability, lead time, or supplier preference, as no technical differentiation exists between them.

Frequently Asked Questions (FAQ)

Q: Can ISP621-4XBL replace ISP621-4BL in existing designs?

A: Yes. The ISP621-4XBL is a parametric equivalent with identical electrical and mechanical specifications. Direct substitution is supported without circuit modification.

Q: Are there any package differences between these parts?

A: No. Both parts use the same 16-DIP package configuration with 0.300" (7.62mm) pitch, ensuring identical PCB footprint and mounting compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both ISP621-4BL and ISP621-4XBL are RoHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What determines if a part can substitute for the ISP621-4BL?

A: Substitution requires matching all critical parameters: 4-channel configuration, 5300Vrms isolation, 200-600% current transfer ratio, 55V maximum output voltage, 50mA per-channel current, 400mV saturation voltage, -30°C to 100°C operating range, and 16-DIP package format.

Q: Are there inventory differences between these equivalent parts?

A: Inventory levels may vary. ISP621-4BL currently has 609 pieces in stock, while ISP621-4XBL has 790 pieces available. Verify current availability with your supplier.