ISP521-4BLSM Equivalent & Substitute Parts

Part Overview

The ISP521-4BLSM is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device provides 5300Vrms isolation voltage and is designed for applications requiring galvanic isolation in DC input circuits. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and regulatory compliance to ensure direct functional equivalence in circuit applications.

Substiute Parts

ISP521-4BLSM

Isocom Components 2004 LTDIn Stock: 872ISP521-4BLSM Datasheet

Current PartRFQ

ISP521-4XBLSM

Isocom Components 2004 LTDIn Stock: 919ISP521-4XBLSM Datasheet

Parametric EquivalentRFQ

TLP521-4XBLSM

Isocom Components 2004 LTDIn Stock: 995TLP521-4XBLSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISP521-4BLSM are qualified based on the following critical parameters that determine functional equivalence:

• Number of Channels: 4 channels required
• Voltage - Isolation: 5300Vrms minimum
• Current Transfer Ratio: 200% minimum @ 1mA
• Output Type: Transistor output configuration
• Voltage - Output (Max): 55V or greater
• Current - Output / Channel: 50mA or greater
• Package / Case: 16-SMD, Gull Wing form factor
• Mounting Type: Surface Mount
• Operating Temperature Range: -30°C to 100°C minimum
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The identified substitutes ISP521-4XBLSM and TLP521-4XBLSM meet all specified electrical and mechanical parameters, ensuring direct circuit compatibility without design modification.

Parameter Comparison

Engineering Selection Recommendations

All three parts—ISP521-4BLSM, ISP521-4XBLSM, and TLP521-4XBLSM—are active production components with identical electrical specifications and mechanical compatibility. Selection between these parts is based on availability and supply chain considerations rather than technical performance differences.

ISP521-4XBLSM and TLP521-4XBLSM are direct parametric equivalents to ISP521-4BLSM. All parts carry ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The 16-SMD gull wing package ensures compatibility with standard surface mount assembly processes. Current inventory levels support production requirements across all three part numbers.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XBLSM be used as a direct replacement for ISP521-4BLSM?

A: Yes. ISP521-4XBLSM is a parametric equivalent with identical electrical characteristics, isolation voltage, current transfer ratio, output specifications, and package configuration. No circuit modifications are required.

Q: What is the difference between ISP521-4BLSM and TLP521-4XBLSM?

A: Both parts share identical electrical specifications including 5300Vrms isolation, 4-channel transistor output, 50mA per channel current capability, and 16-SMD gull wing packaging. The primary difference is the series designation (ISP521-4 versus TLP521-4), which reflects different product lines from the same manufacturer. Functional performance in circuit applications is equivalent.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the 16-SMD gull wing package with identical pin configuration and mechanical dimensions. PCB layouts designed for ISP521-4BLSM accommodate ISP521-4XBLSM and TLP521-4XBLSM without modification.

Q: Do these parts meet RoHS and REACH compliance requirements?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for use in regulated industries and markets.

Q: What is the operating temperature range for these optoisolators?

A: The operating temperature range for all three parts is -30°C to 100°C, suitable for industrial and commercial applications within this thermal envelope.

Q: Can these parts be used interchangeably in high-isolation applications?

A: Yes. All three parts provide 5300Vrms isolation voltage and are suitable for applications requiring galvanic isolation between input and output circuits. The 4-channel configuration supports multiple isolated signal paths within a single package.