HCPL-655K Equivalent & Substitute Parts

Part Overview

The HCPL-655K is an optoisolator transistor with base output manufactured by Broadcom Limited. This component provides 1500VDC isolation across 4 channels in a 16-FlatPack surface mount package. The device is currently active in production with 820 units in stock. Alternative part numbers are necessary to support supply chain flexibility, design redundancy, and inventory management across manufacturing operations.

Substiute Parts

HCPL-655K

Broadcom LimitedIn Stock: 886HCPL-655K Datasheet

Current PartRFQ

HCPL-6551

Broadcom LimitedIn Stock: 1629HCPL-6551 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL-655K is determined by strict equivalence across the following critical parameters:

• Isolation Voltage: 1500VDC (mandatory match)
• Number of Channels: 4 channels (mandatory match)
• Output Type: Transistor with Base (mandatory match)
• Package / Case: 16-FlatPack (mandatory match)
• Current Transfer Ratio (Min): 9% @ 16mA (mandatory match)
• Voltage - Output (Max): 20V (mandatory match)
• Current - Output / Channel: 8mA (mandatory match)
• Operating Temperature Range: -55°C ~ 125°C (mandatory match)
• Mounting Type: Surface Mount (mandatory match)

The HCPL-6551 meets all substitution criteria as a parametric equivalent from the same manufacturer with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the HCPL-655K and HCPL-6551 are active production components from Broadcom Limited with identical parametric specifications. Selection between these parts may be based on inventory availability: HCPL-655K has 820 units in stock, while HCPL-6551 has 1562 units available. Both components carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The 16-FlatPack surface mount package is consistent across both parts, ensuring PCB layout compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can HCPL-6551 be used as a direct replacement for HCPL-655K?

A: Yes. The HCPL-6551 is a parametric equivalent with identical electrical and mechanical specifications across all critical parameters including isolation voltage, channel count, output type, package, and operating temperature range.

Q: Are there any differences in compliance or certifications between these parts?

A: No. Both parts carry identical RoHS3 compliance, REACH Unaffected status, and EAR99 export classification.

Q: Will PCB layout require modification when substituting HCPL-6551 for HCPL-655K?

A: No. Both components use the 16-FlatPack surface mount package with identical pinout and footprint requirements.

Q: What is the basis for substitution eligibility?

A: Substitution is based on strict equivalence across isolation voltage (1500VDC), channel count (4), output type (Transistor with Base), current transfer ratio (9% @ 16mA), output voltage (20V max), output current (8mA per channel), operating temperature range (-55°C to 125°C), and package type (16-FlatPack).

Q: Are there any performance differences between HCPL-655K and HCPL-6551?

A: No performance differences exist. Turn-on/turn-off times, rise/fall characteristics, and all electrical parameters are identical.