LNK6407D Equivalent & Substitute Parts

Part Overview

The LNK6407D is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device integrates a high-voltage power switch with control circuitry optimized for flyback topology converters operating up to 85 kHz. The LNK6407D is part of the LinkSwitch™-3 series and has been discontinued at DiGi Electronics. Due to its discontinued status, identifying equivalent substitute parts is essential for design continuity and procurement planning.

Substiute Parts

LNK6407D

Power IntegrationsIn Stock: 23406LNK6407D Datasheet

Current PartRFQ

LNK6417D

Power IntegrationsIn Stock: 8605LNK6417D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK6407D is determined by strict equivalence across the following critical parameters:

Topology & Functional Requirements:

• Flyback converter topology
• Isolated output configuration
• Internal integrated power switch

Electrical Specifications:

• Voltage breakdown rating: 725V
• Switching frequency: Up to 85 kHz
• Power rating: 7.5 W
• Duty cycle: 55%
• Fault protection features: Current Limiting, Open Loop, Over Temperature, Short Circuit

Physical & Environmental Compatibility:

• Package type: 8-SOIC (SO-8C), 7 leads
• Operating temperature range: -40°C ~ 150°C (TJ)
• Surface mount configuration
• RoHS compliance
• MSL rating: 1 (Unlimited)

The LNK6417D meets all these criteria and is classified as a parametric equivalent within the LinkSwitch™-3 series.

Parameter Comparison

Engineering Selection Recommendations

The LNK6417D is a direct parametric equivalent to the LNK6407D. Both devices share identical electrical specifications, thermal ratings, package configurations, and compliance certifications. The primary distinction is packaging format: the LNK6407D was supplied in standard packaging, while the LNK6417D is available in tube packaging.

From an engineering perspective, the LNK6417D is suitable for direct substitution in applications currently designed around the LNK6407D. Both parts maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with standard PCB assembly processes and environmental requirements.

The availability of the LNK6417D (8,563 units in stock) provides a viable alternative to the discontinued LNK6407D (23,305 units previously in stock). Selection between these parts should be based on procurement requirements, packaging preferences, and inventory availability rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the LNK6417D replace the LNK6407D in existing designs?

A: Yes. The LNK6417D is a parametric equivalent with identical electrical specifications, thermal characteristics, and package dimensions. No circuit modifications are required for substitution.

Q: Are there differences in performance between these parts?

A: No. Both devices operate at identical switching frequencies (up to 85 kHz), power ratings (7.5 W), duty cycles (55%), and fault protection thresholds. Performance in flyback converter applications is equivalent.

Q: What is the difference between the two part numbers?

A: The primary difference is packaging format. The LNK6407D and LNK6417D are both LinkSwitch™-3 series devices with identical electrical and thermal specifications. The packaging designation reflects supplier distribution format.

Q: Are both parts RoHS compliant?

A: Yes. Both the LNK6407D and LNK6417D are RoHS compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, suitable for standard surface mount assembly processes.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts use the 8-SOIC (SO-8C) package with 7 leads and identical pin configurations. PCB layouts designed for one part accommodate the other without modification.

Q: What is the operating temperature range for both parts?

A: Both devices operate across -40°C to 150°C junction temperature (TJ), suitable for industrial and consumer applications with standard thermal management.