ISP621-1SM Optoisolator Equivalent & Substitute Parts

Part Overview

The ISP621-1SM is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms and is designed for applications requiring DC input signal isolation with transistor-based output switching. The part is currently in active production status with 915 units in stock. Alternative part numbers within the same series and cross-compatible designs are available to support supply chain flexibility and application-specific requirements.

Substiute Parts

ISP621-1SM

Isocom Components 2004 LTDIn Stock: 930ISP621-1SM Datasheet

Current PartRFQ

ISP621-1XGRSM

Isocom Components 2004 LTDIn Stock: 1010ISP621-1XGRSM Datasheet

Parametric EquivalentRFQ

ISP621-1XSM

Isocom Components 2004 LTDIn Stock: 1270ISP621-1XSM Datasheet

Parametric EquivalentRFQ

TLP521XSM

Isocom Components 2004 LTDIn Stock: 819TLP521XSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISP621-1SM is determined by strict parametric equivalence across the following critical specifications:

Isolation Voltage: 5300Vrms (all substitutes match)

Channel Configuration: Single channel (all substitutes match)

Output Stage: Transistor output with maximum 55V and 50mA per channel (all substitutes match)

Current Transfer Ratio: 50% minimum and 600% maximum at 5mA (all substitutes match)

Saturation Voltage: 400mV maximum (all substitutes match)

Temperature Range: -30°C to 100°C (all substitutes match)

Package: 4-SMD, Gull Wing surface mount (all substitutes match)

Compliance: ROHS3 compliant, MSL Level 1 (all substitutes match)

The substitute parts ISP621-1XGRSM, ISP621-1XSM, and TLP521XSM maintain full parametric compatibility with the main part number across all electrical and mechanical specifications. Differences exist only in series designation and minor timing characteristics that do not affect functional substitution.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active production status and full ROHS3 compliance with MSL Level 1 rating. Selection between ISP621-1SM, ISP621-1XGRSM, ISP621-1XSM, and TLP521XSM is based on availability and series preference rather than electrical performance differentiation.

ISP621-1XSM offers the highest current inventory at 1179 units, supporting applications with extended lead time requirements. ISP621-1XGRSM provides 981 units with identical electrical specifications. TLP521XSM, belonging to the TLP521 series, maintains full parametric compatibility with 770 units available. ISP621-1SM remains the primary specification with 915 units in stock.

All parts are suitable for direct substitution in applications requiring single-channel optoisolation at 5300Vrms with transistor output switching up to 50mA at 55V maximum.

Frequently Asked Questions (FAQ)

Q: Can ISP621-1XGRSM, ISP621-1XSM, and TLP521XSM be used interchangeably with ISP621-1SM?

A: Yes. All substitute parts maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage and current ratings, saturation voltage, and operating temperature range. The 4-SMD Gull Wing package is consistent across all variants, enabling direct PCB footprint compatibility.

Q: What is the difference between ISP621-1 series and TLP521 series parts?

A: Both series share identical electrical and mechanical specifications for the single-channel, 5300Vrms isolation configuration. The series designation reflects internal design variants within Isocom Components 2004 LTD product portfolio. Functional performance in circuit applications is equivalent.

Q: Are there timing differences between these substitute parts?

A: ISP621-1SM, ISP621-1XGRSM, and ISP621-1XSM specify rise and fall times of 4µs and 3µs respectively. TLP521XSM specifies turn-on and turn-off times of 3µs with identical rise and fall times of 4µs and 3µs. These minor timing variations do not affect substitution eligibility for standard isolation applications.

Q: What is the moisture sensitivity level for these parts?

A: All parts carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. ISP621-1SM, ISP621-1XGRSM, ISP621-1XSM, and TLP521XSM are all ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for industrial and commercial applications.

Q: Which part should be selected based on availability?

A: ISP621-1XSM offers the highest inventory level at 1179 units. For applications requiring immediate availability, this variant provides the shortest procurement timeline. All variants maintain identical specifications and are suitable for equivalent performance.