LNK6426D Equivalent & Substitute Parts

Part Overview

The LNK6426D is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device integrates a high-voltage internal switch with comprehensive fault protection in a compact 8-SOIC package. The LNK6426D is part of the LinkSwitch™-3 series and has been discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for design continuity and procurement planning.

Substiute Parts

LNK6426D

Power IntegrationsIn Stock: 2387LNK6426D Datasheet

Current PartRFQ

LNK6417D

Power IntegrationsIn Stock: 8605LNK6417D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK6426D is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 725V rating
• Frequency - Switching: Up to 85kHz operation
• Package / Case: 8-SOIC (0.154", 3.90mm Width), 7 Leads
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Open Loop, Over Temperature, Short Circuit
• Series: LinkSwitch™-3

Allowable Variation:

• Power (Watts): The substitute part LNK6417D operates at 7.5 W, which exceeds the 6.1 W specification of the LNK6426D. This higher power rating is acceptable for substitution as it provides additional capability within the same electrical and thermal envelope.

The LNK6417D meets all mandatory parameters and represents a direct parametric equivalent with enhanced power handling capability.

Parameter Comparison

Engineering Selection Recommendations

The LNK6417D is a direct substitute for the LNK6426D based on parametric equivalence within the LinkSwitch™-3 product family. Both devices are RoHS Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components.

The LNK6426D is discontinued at DiGi Electronics. The LNK6417D provides equivalent functionality with higher power output (7.5 W versus 6.1 W) while maintaining identical electrical characteristics, thermal operating range, and package specifications. The increased power rating of the substitute part does not introduce compatibility issues in applications designed for the original LNK6426D specification.

Selection between these parts should be based on component availability and procurement lead times, as both devices satisfy the same electrical and mechanical requirements for flyback converter applications requiring isolated output, 725V breakdown voltage, and 85kHz switching frequency operation.

Frequently Asked Questions (FAQ)

Q: Can the LNK6417D directly replace the LNK6426D in existing designs?

A: Yes. The LNK6417D is a parametric equivalent with identical topology, voltage rating, switching frequency, operating temperature range, and package configuration. The higher power rating (7.5 W versus 6.1 W) represents additional capability and does not create compatibility issues.

Q: Are there any package differences between LNK6426D and LNK6417D?

A: No. Both devices use the 8-SOIC (0.154", 3.90mm Width), 7 Leads package with surface mount configuration. PCB layout and footprint requirements are identical.

Q: What is the significance of the power rating difference?

A: The LNK6417D operates at 7.5 W compared to the LNK6426D at 6.1 W. This difference reflects the maximum power handling capability of each device. The substitute part's higher rating provides additional design margin and does not require circuit modifications for applications originally specified for 6.1 W operation.

Q: Are both parts RoHS compliant?

A: Yes. Both the LNK6426D and LNK6417D are RoHS Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: What fault protection features are included?

A: Both devices include Current Limiting, Open Loop, Over Temperature, and Short Circuit fault protection mechanisms.

Q: Why is the LNK6426D discontinued?

A: The LNK6426D is discontinued at DiGi Electronics. The LNK6417D remains available as the current equivalent offering within the LinkSwitch™-3 series.