HCPL-261N Equivalent & Substitute Parts

Part Overview

The HCPL-261N is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. This 8-DIP through-hole component provides 3750Vrms isolation with open collector Schottky clamped output, supporting 10MBd data rates and 1kV/µs common mode transient immunity. The part is currently active in production. Substitute parts are necessary when addressing supply constraints, enhanced performance requirements, or compliance specifications that differ from the original design.

Substiute Parts

HCPL-261N

Broadcom LimitedIn Stock: 1218HCPL-261N Datasheet

Current PartRFQ

HCPL2611M

onsemiIn Stock: 12713HCPL2611M Datasheet

DirectRFQ

FOD260L

Fairchild SemiconductorIn Stock: 5728FOD260L Datasheet

MFR RecommendedRFQ

HCPL2601

onsemiIn Stock: 2352HCPL2601 Datasheet

MFR RecommendedRFQ

HCPL2611

onsemiIn Stock: 2165HCPL2611 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Package compatibility: All substitutes must use 8-DIP (0.300", 7.62mm) through-hole mounting
• Functional equivalence: Single-channel logic output optoisolator with open collector output
• Electrical compatibility: Supply voltage range 4.5V ~ 5.5V, output current 50 mA per channel
• Data rate: 10Mbps/10MBd operation
• Isolation voltage: Minimum 3750Vrms (substitutes may exceed this specification)
• Common mode transient immunity: Minimum 1kV/µs (substitutes may exceed this specification)

The following parts meet these substitution criteria:

• HCPL2611M (onsemi): Enhanced isolation (5000Vrms) and CMTI (10kV/µs), RoHS3 compliant
• FOD260L (Fairchild Semiconductor): Enhanced isolation (5000Vrms), superior CMTI (25kV/µs), Schottky clamped output
• HCPL2601 (onsemi): Lower isolation (2500Vrms), RoHS3 compliant, product status obsolete
• HCPL2611 (onsemi): Lower isolation (2500Vrms), enhanced CMTI (10kV/µs), RoHS3 compliant, product status obsolete

Parameter Comparison

Engineering Selection Recommendations

HCPL2611M is the primary recommended substitute for new designs. This part maintains active product status, achieves RoHS3 compliance, and provides enhanced isolation voltage (5000Vrms) and common mode transient immunity (10kV/µs) compared to the HCPL-261N. The extended operating temperature range (-40°C ~ 100°C) supports broader thermal applications. Propagation delay is improved to 75ns for both rising and falling edges.

FOD260L offers the highest common mode transient immunity (25kV/µs) and fastest rise/fall times (22ns/3ns), making it suitable for applications requiring superior noise immunity and switching performance. This part maintains active status and supports a wider supply voltage range (3V ~ 5.5V). Schottky clamping is retained from the original design.

HCPL2601 and HCPL2611 are not recommended for new designs due to obsolete product status. These parts feature lower isolation voltage (2500Vrms) than the HCPL-261N and should only be considered for legacy system maintenance where supply continuity is critical.

Frequently Asked Questions (FAQ)

Q: Can HCPL2611M directly replace HCPL-261N in existing designs?

A: Yes. Both parts share identical package geometry (8-DIP), supply voltage range (4.5V ~ 5.5V), output current (50 mA), and data rate (10Mbps/10MBd). The HCPL2611M exceeds the isolation and CMTI specifications of the HCPL-261N, ensuring functional compatibility. Pin-for-pin compatibility must be verified against specific application schematics.

Q: What is the key difference between FOD260L and HCPL2611M?

A: FOD260L provides superior common mode transient immunity (25kV/µs versus 10kV/µs) and faster switching characteristics (22ns/3ns rise/fall time versus 50ns/12ns). FOD260L retains Schottky clamping from the original HCPL-261N design. FOD260L supports a lower minimum supply voltage (3V versus 4.5V).

Q: Why are HCPL2601 and HCPL2611 listed as substitutes if they are obsolete?

A: These parts are documented as historical substitutes based on the provided data. Obsolete status indicates limited or no availability for new procurement. They should only be considered for legacy system repairs where original part sourcing is impossible.

Q: Are all substitute parts RoHS compliant?

A: HCPL2611M, HCPL2601, and HCPL2611 are RoHS3 compliant. FOD260L compliance status is not specified in the provided data. The original HCPL-261N is RoHS non-compliant.

Q: Does isolation voltage rating affect circuit design?

A: Higher isolation voltage ratings (5000Vrms for HCPL2611M and FOD260L versus 3750Vrms for HCPL-261N) provide additional safety margin in high-voltage isolation applications. Circuit design remains compatible as long as the minimum isolation requirement is met. No design changes are required when substituting with higher-rated parts.

Q: What packaging options are available?

A: All listed parts use 8-DIP (0.300", 7.62mm) through-hole mounting. HCPL-261N and substitute parts are mechanically and electrically compatible for PCB assembly without layout modifications.