HCPL-261N-320E Equivalent & Substitute Parts

Part Overview

The HCPL-261N-320E is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. This device provides 5000Vrms isolation with open collector Schottky clamped output, supporting data rates up to 10MBd. The part is currently in active production status with 2220 units available in inventory.

Substitute parts become necessary when the primary component reaches end-of-life, 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-320E

Broadcom LimitedIn Stock: 2259HCPL-261N-320E Datasheet

Current PartRFQ

HCPL2601SD

onsemiIn Stock: 23190HCPL2601SD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL-261N-320E is determined by the following critical parameters:

• Isolation Voltage: Substitute parts must maintain isolation voltage at or above 2500Vrms. The primary part specifies 5000Vrms; substitutes operating at lower isolation ratings remain functionally compatible for applications not requiring maximum isolation margin.
• Output Configuration: Open collector output topology is mandatory. Schottky clamping is a performance enhancement but not a substitution barrier.
• Data Rate: Minimum 10Mbps/MBd performance is required for functional equivalence.
• Channel Count: Single-channel configuration is required.
• 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: 8-pin SMD Gull Wing package is the mechanical standard.
• Compliance: RoHS3 compliance and REACH unaffected status are required.

The HCPL2601SD meets these substitution criteria with the following variance: isolation voltage is rated at 2500Vrms (lower than the primary part) and common mode transient immunity is rated at 5kV/µs (higher than the primary part). These variations remain within acceptable substitution parameters for this product category.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The HCPL-261N-320E is recommended for new designs and applications requiring maximum isolation voltage (5000Vrms) with Schottky clamped output performance. Active production status ensures long-term availability and supply chain stability.

Substitute Part Selection: The HCPL2601SD is suitable for applications where the lower isolation voltage rating (2500Vrms) is acceptable and where the higher common mode transient immunity (5kV/µs) provides design advantages. However, this part carries obsolete status, indicating limited future availability. Selection of this substitute should be restricted to legacy system maintenance or where supply of the primary part is unavailable.

Both parts maintain identical supply voltage ranges, operating temperature specifications, and compliance certifications (RoHS3, REACH unaffected). Pin-to-pin compatibility in the 8-SMD Gull Wing package enables direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the HCPL2601SD directly replace the HCPL-261N-320E in existing designs?

A: Pin-to-pin compatibility exists for the 8-SMD Gull Wing package. However, the lower isolation voltage rating (2500Vrms vs. 5000Vrms) must be evaluated against application requirements. If the design operates at isolation voltages below 2500Vrms, substitution is electrically valid. If higher isolation margins are required, the primary part is necessary.

Q: What is the impact of the missing Schottky clamping in the HCPL2601SD?

A: Schottky clamping in the primary part provides faster output switching and reduced parasitic effects. The HCPL2601SD achieves faster propagation delay (75ns vs. 100ns) through alternative circuit design. For applications sensitive to output switching characteristics, both parts should be evaluated in the target circuit.

Q: Why is the HCPL2601SD listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. For new designs, the active-status HCPL-261N-320E is the recommended choice.

Q: Are there differences in common mode transient immunity between these parts?

A: Yes. The HCPL2601SD is rated at 5kV/µs compared to the primary part's 1kV/µs. Higher CMTI rating indicates superior performance in high-speed switching environments with steep voltage transitions. This represents a performance advantage for the substitute in specific applications.

Q: Do both parts require identical PCB layout considerations?

A: Both parts use the same 8-SMD Gull Wing package and identical supply voltage range (4.5V ~ 5.5V). PCB layout, decoupling, and isolation barrier routing can remain unchanged during substitution. Verify that isolation voltage requirements do not necessitate increased creepage or clearance distances.