ISP621-4XSMT&R Equivalent & Substitute Parts

Part Overview

The ISP621-4XSMT&R is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device 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 (MSL 1). Substitute parts are identified based on matching electrical isolation characteristics, channel configuration, output specifications, and surface mount packaging requirements.

Substiute Parts

ISP621-4XSMT&R

Isocom Components 2004 LTDIn Stock: 952ISP621-4XSMT&R Datasheet

Current PartRFQ

ISP521-4XSMT&R

Isocom Components 2004 LTDIn Stock: 1691ISP521-4XSMT&R Datasheet

Parametric EquivalentRFQ

TLP521-4XSMT&R

Isocom Components 2004 LTDIn Stock: 1897TLP521-4XSMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISP621-4XSMT&R are qualified based on the following critical parameters that determine functional equivalence:

• Number of Channels: 4 channels required
• Voltage - Isolation: 5300Vrms isolation rating
• Output Type: Transistor output configuration
• Voltage - Output (Max): 55V maximum output voltage
• Current - Output / Channel: 50mA per channel capacity
• Current Transfer Ratio: 50% minimum and 600% maximum @ 5mA
• Vce Saturation (Max): 400mV maximum saturation voltage
• Rise / Fall Time (Typ): 4µs rise time, 3µs fall time
• Package / Case: 16-SMD, Gull Wing surface mount
• Operating Temperature: -30°C to 100°C range
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited)

All substitute parts maintain identical electrical performance specifications and mechanical compatibility with the main part.

Parameter Comparison

Engineering Selection Recommendations

All three parts—ISP621-4XSMT&R, ISP521-4XSMT&R, and TLP521-4XSMT&R—are Active status products with full ROHS3 compliance and REACH unaffected designation. Each part meets identical electrical and mechanical specifications for quad-channel optoisolator applications requiring 5300Vrms isolation, 50mA per-channel output, and 16-SMD surface mount packaging. Selection between these parts is based on availability and supply chain requirements rather than technical performance differentiation. All parts are suitable for direct substitution in applications designed for any of these part numbers.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XSMT&R be used as a direct replacement for ISP621-4XSMT&R?

A: Yes. Both parts share identical electrical specifications including 5300Vrms isolation, 4-channel transistor output configuration, 50mA per-channel current capacity, and 16-SMD Gull Wing surface mount packaging. No circuit modifications are required.

Q: What is the difference between ISP621-4XSMT&R and TLP521-4XSMT&R?

A: Both parts are functionally equivalent with matching isolation voltage, channel count, output current rating, and package type. The part number series designation differs (ISP621 vs. TLP521), but all electrical and mechanical parameters are identical.

Q: Are these parts pin-compatible?

A: Yes. All three parts use the same 16-SMD Gull Wing package configuration with identical pin assignments for quad-channel transistor output optoisolators.

Q: Do all substitute parts have the same RoHS and compliance status?

A: Yes. ISP621-4XSMT&R, ISP521-4XSMT&R, and TLP521-4XSMT&R are all ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.49.8000.

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

A: All three parts have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these parts operate across the full -30°C to 100°C temperature range?

A: Yes. All substitute parts maintain specified performance across the -30°C to 100°C operating temperature range.