HCPL-261A-520 Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL-261A-520 is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed isolation applications requiring 5000Vrms isolation voltage and open collector output with Schottky clamping. This component operates at 10MBd data rate with 1kV/µs common mode transient immunity across a single isolation channel.

The HCPL-261A-520 is discontinued at DiGi Electronics. Equivalent and substitute parts are available to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

HCPL-261A-520

Broadcom LimitedIn Stock: 1119HCPL-261A-520 Datasheet

Current PartRFQ

HCPL-261A-520E

Broadcom LimitedIn Stock: 670HCPL-261A-520E Datasheet

DirectRFQ

HCPL2601SD

onsemiIn Stock: 23190HCPL2601SD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL-261A-520 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms required for direct replacement
• Number of Channels: Must be 1 channel
• Output Type: Open collector configuration with Schottky clamping
• Data Rate: Minimum 10MBd
• Common Mode Transient Immunity: Minimum 1kV/µs
• Output Current: 50 mA per channel
• Supply Voltage Range: 4.5V ~ 5.5V
• Package Type: 8-SMD, Gull Wing form factor
• Operating Temperature Range: -40°C ~ 85°C

Two substitute parts are identified:

Direct Equivalent (Pin-Compatible, Specification-Matched): HCPL-261A-520E from Broadcom Limited maintains identical electrical specifications and packaging.

Functional Substitute (Lower Isolation Voltage, Enhanced CMTI): HCPL2601SD from onsemi provides equivalent functionality with reduced isolation voltage (2500Vrms) but enhanced common mode transient immunity (5kV/µs). This part is suitable only for applications where 2500Vrms isolation is sufficient.

Parameter Comparison

Engineering Selection Recommendations

HCPL-261A-520E is the primary substitute for the discontinued HCPL-261A-520. Both parts are manufactured by Broadcom Limited with identical electrical specifications, isolation voltage, and package configuration. The HCPL-261A-520E is currently in active product status and ROHS3 compliant, making it suitable for new designs and production applications requiring direct replacement without circuit modification.

HCPL2601SD from onsemi is a functional alternative only for applications where the isolation voltage requirement can be reduced from 5000Vrms to 2500Vrms. This part offers superior common mode transient immunity (5kV/µs versus 1kV/µs) and faster propagation delay (75ns versus 100ns), but is currently obsolete. Selection of HCPL2601SD requires verification that the lower isolation voltage meets system safety and regulatory requirements.

For new designs, HCPL-261A-520E is the recommended choice due to active product status and regulatory compliance. For legacy system maintenance where the original HCPL-261A-520 is no longer available, HCPL-261A-520E provides drop-in compatibility.

Frequently Asked Questions (FAQ)

Q: Can HCPL-261A-520E be used as a direct replacement for HCPL-261A-520?

A: Yes. HCPL-261A-520E is manufactured by the same supplier (Broadcom Limited) with identical electrical specifications, isolation voltage (5000Vrms), output configuration, data rate (10MBd), and 8-SMD Gull Wing package. No circuit modifications are required.

Q: What is the key difference between HCPL-261A-520E and HCPL2601SD?

A: The primary difference is isolation voltage. HCPL-261A-520E maintains 5000Vrms isolation matching the original part, while HCPL2601SD provides only 2500Vrms isolation. HCPL2601SD compensates with higher common mode transient immunity (5kV/µs) and faster propagation delay (75ns). Selection depends on whether your application requires 5000Vrms isolation.

Q: Are there packaging differences between these optoisolators?

A: All three parts use 8-SMD Gull Wing packaging and are surface mount components. They are mechanically compatible with the same PCB footprint.

Q: What is the compliance status of each substitute?

A: HCPL-261A-520E is ROHS3 compliant and currently active. HCPL2601SD is ROHS3 compliant but obsolete. The original HCPL-261A-520 is RoHS non-compliant and discontinued.

Q: Can HCPL2601SD be used in high-voltage isolation applications?

A: HCPL2601SD is limited to 2500Vrms isolation. Applications requiring 5000Vrms isolation must use HCPL-261A-520E or the original HCPL-261A-520. Verify isolation voltage requirements against system safety standards before selecting HCPL2601SD.

Q: What supply voltage range do these parts support?

A: All three optoisolators operate with supply voltage between 4.5V and 5.5V. They are compatible with standard 5V logic systems.