ISP521-4BLSMT&R Equivalent & Substitute Parts

Part Overview

The ISP521-4BLSMT&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 and maintains full RoHS3 compliance with MSL Level 1 rating. Substitute parts are identified when electrical and mechanical parameters align within the allowed specifications for this optoisolator category.

Substiute Parts

ISP521-4BLSMT&R

Isocom Components 2004 LTDIn Stock: 847ISP521-4BLSMT&R Datasheet

Current PartRFQ

ISP521-4XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1567ISP521-4XBLSMT&R Datasheet

Parametric EquivalentRFQ

TLP521-4XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1613TLP521-4XBLSMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISP521-4BLSMT&R are qualified based on the following critical parameters that define functional equivalence:

• Number of Channels: 4
• Voltage - Isolation: 5300Vrms
• Current Transfer Ratio range: 200% to 600% @ 1mA
• Output Type: Transistor
• Voltage - Output (Max): 55V
• Current - Output / Channel: 50mA
• Vce Saturation (Max): 400mV
• Package / Case: 16-SMD, Gull Wing
• Operating Temperature: -30°C ~ 100°C
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

Two substitute parts meet these criteria: ISP521-4XBLSMT&R and TLP521-4XBLSMT&R. Both maintain identical isolation voltage, channel count, output specifications, and compliance certifications. Differences in series designation and turn-on/turn-off timing do not affect substitution eligibility within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

All three parts—ISP521-4BLSMT&R, ISP521-4XBLSMT&R, and TLP521-4XBLSMT&R—are classified as Active products with full RoHS3 compliance and REACH Unaffected status. Selection between these parts is based on availability and inventory levels. ISP521-4XBLSMT&R offers 1512 pieces in stock, TLP521-4XBLSMT&R provides 1590 pieces, and ISP521-4BLSMT&R has 798 pieces available. All parts meet identical electrical and mechanical specifications for quad-channel 5300Vrms isolation optoisolator applications with 16-SMD surface mount packaging.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical electrical specifications including 4-channel configuration, 5300Vrms isolation voltage, 200-600% current transfer ratio, 55V maximum output voltage, and 50mA per-channel output current. Package and mounting type are identical: 16-SMD, Gull Wing surface mount. Compliance certifications match across RoHS3 and MSL Level 1.

Q: What is the difference between ISP521-4XBLSMT&R and TLP521-4XBLSMT&R?

A: The parts differ in series designation (ISP521-4 versus TLP521-4) and turn-on/turn-off timing specifications. ISP521-4XBLSMT&R lists turn-on/turn-off time as not specified, while TLP521-4XBLSMT&R specifies 3µs turn-on and 3µs turn-off. All other electrical parameters, isolation voltage, output specifications, and package format remain identical.

Q: Are all three parts suitable for the same PCB layout?

A: Yes. All three parts use identical 16-SMD, Gull Wing surface mount packaging. PCB footprints, land patterns, and assembly processes are compatible across ISP521-4BLSMT&R, ISP521-4XBLSMT&R, and TLP521-4XBLSMT&R.

Q: Do these parts meet automotive or industrial compliance requirements?

A: All three parts are RoHS3 compliant, REACH Unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity rating. ECCN classification is EAR99 for all parts. Compliance certifications are identical across the group.

Q: What is the maximum isolation voltage these parts provide?

A: All three parts provide 5300Vrms galvanic isolation across each of the four channels.