HCPL-261N-520E Equivalent & Substitute Parts

Part Overview

The HCPL-261N-520E is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. This component features 5000Vrms isolation voltage, open collector output with Schottky clamping, and supports data rates up to 10MBd. The part is currently in active production status with 749 units available in inventory.

Substitute parts become necessary when the primary component reaches end-of-life status, experiences supply constraints, or when design requirements permit operation within alternative electrical and mechanical parameters. The HCPL2601SD represents a documented manufacturer-recommended alternative that maintains functional compatibility within specified tolerance ranges.

Substiute Parts

HCPL-261N-520E

Broadcom LimitedIn Stock: 782HCPL-261N-520E Datasheet

Current PartRFQ

HCPL2601SD

onsemiIn Stock: 23190HCPL2601SD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL-261N-520E is determined by the following critical parameters:

• Isolation Voltage: Substitute parts must maintain isolation voltage at or above 2500Vrms. The HCPL2601SD operates at 2500Vrms, which is acceptable for applications where the full 5000Vrms rating is not required.
• Output Configuration: Open collector topology must be preserved to maintain circuit compatibility.
• Current Rating: Output current capability must equal or exceed 50mA per channel.
• Data Rate: Minimum 10Mbps support is required for signal integrity.
• Supply Voltage: 4.5V to 5.5V operating range must be maintained.
• Operating Temperature: -40°C to 85°C range must be supported.
• Package Type: Surface mount 8-pin configuration with gull wing leads ensures mechanical compatibility.

The HCPL2601SD meets these substitution criteria despite differences in Common Mode Transient Immunity (5kV/µs versus 1kV/µs) and propagation delay characteristics.

Parameter Comparison

Engineering Selection Recommendations

The HCPL-261N-520E is the primary component choice for new designs requiring 5000Vrms isolation voltage in active production environments. Both the main part and HCPL2601SD substitute maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

The HCPL2601SD is classified as obsolete, which limits its suitability for long-term production applications. However, it remains electrically compatible for applications where 2500Vrms isolation voltage is sufficient. The substitute part demonstrates superior propagation delay performance (75ns versus 100ns) and higher Common Mode Transient Immunity (5kV/µs versus 1kV/µs), which may provide advantages in specific high-speed or high-noise environments despite the reduced isolation voltage rating.

Selection between these parts depends on isolation voltage requirements and supply availability. Applications requiring the full 5000Vrms isolation rating must use the HCPL-261N-520E. Applications tolerant of 2500Vrms isolation may consider the HCPL2601SD only when the primary part is unavailable and obsolescence risk is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the HCPL2601SD directly replace the HCPL-261N-520E in all applications?

A: Direct replacement is possible only in applications where 2500Vrms isolation voltage meets the design requirement. The HCPL2601SD is not suitable for circuits requiring the full 5000Vrms isolation rating of the HCPL-261N-520E.

Q: What is the significance of the isolation voltage difference between these parts?

A: Isolation voltage determines the maximum voltage differential that can be safely applied across the optoisolator's isolation barrier. The HCPL-261N-520E supports twice the isolation voltage of the HCPL2601SD. Applications operating in high-voltage environments or requiring maximum safety margins must use the higher-rated component.

Q: Are the package dimensions identical between these parts?

A: Both parts use 8-SMD gull wing surface mount packages. Mechanical compatibility is maintained, allowing direct PCB footprint reuse without layout modifications.

Q: Why is the HCPL2601SD listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. While existing inventory may be available, long-term supply cannot be guaranteed. New designs should specify the HCPL-261N-520E to ensure component availability throughout the product lifecycle.

Q: How do the propagation delay differences affect circuit performance?

A: The HCPL2601SD exhibits faster propagation delays (75ns versus 100ns). In timing-critical applications, this difference may improve signal integrity. However, this advantage does not offset the reduced isolation voltage rating for applications requiring 5000Vrms protection.

Q: Are both parts suitable for industrial temperature ranges?

A: Both components operate across the -40°C to 85°C temperature range, supporting standard industrial applications. No temperature-related restrictions apply to substitution decisions.