LNK6426D-TL Equivalent & Substitute Parts

Part Overview

The LNK6426D-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the LinkSwitch™-3 series. This isolated power management IC operates at switching frequencies up to 85kHz and delivers 6.1W output power in an 8-SOIC surface mount package. The device is Active status and RoHS compliant, designed for offline flyback topology applications requiring integrated current limiting, open loop, over temperature, and short circuit protection.

Substitute parts are identified when design requirements permit alternative models with compatible electrical characteristics, identical packaging, and equivalent functional performance within specified operating parameters.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	725V
Frequency - Switching	Up to 85kHz
Power (Watts)	6.1 W
Duty Cycle	55%
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width), 7 Leads
Mounting Type	Surface Mount
Fault Protection	Current Limiting, Open Loop, Over Temperature, Short Circuit
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LNK6426D-TL are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Flyback
Output Isolation: Isolated
Package / Case: 8-SOIC (0.154", 3.90mm Width), 7 Leads
Mounting Type: Surface Mount
Frequency - Switching: Up to 85kHz
Duty Cycle: 55%
Operating Temperature: -40°C ~ 150°C (TJ)
Fault Protection: Current Limiting, Open Loop, Over Temperature, Short Circuit
RoHS Status: RoHS Compliant

Secondary Variation Parameters:

Voltage - Breakdown: 700V to 725V (acceptable range)
Power (Watts): 4.1W to 7.5W (application-dependent selection)
Series: LinkSwitch™-3 or LinkSwitch®-II

The LNK6426D-TL operates at 6.1W output power with 725V breakdown voltage. Substitute parts maintain identical package geometry, isolation characteristics, and protection features. Power rating variations (4.1W, 6.1W, 7.5W) allow selection based on specific application requirements. Breakdown voltage tolerance (700V to 725V) remains within acceptable operating margins for offline flyback applications.

Parameter Comparison

Part Number	Series	Voltage - Breakdown	Power (Watts)	Frequency - Switching	Package / Case	Inventory (Pcs)	Product Status
LNK6426D-TL	LinkSwitch™-3	725V	6.1 W	Up to 85kHz	8-SOIC, 7 Leads	1076	Active
LNK6407D-TL	LinkSwitch™-3	725V	7.5 W	Up to 85kHz	8-SOIC, 7 Leads	15700	Active
LNK6406D-TL	LinkSwitch™-3	725V	6.1 W	Up to 85kHz	8-SOIC, 7 Leads	3103	Active
LNK6404D-TL	LinkSwitch™-3	725V	4.1 W	Up to 85kHz	8-SOIC, 7 Leads	1782	Active
LNK616DG-TL	LinkSwitch®-II	700V	6.1 W	Up to 85kHz	8-SOIC, 7 Leads	67700	Active
LNK606DG-TL	LinkSwitch®-II	700V	6.1 W	Up to 85kHz	8-SOIC, 7 Leads	40800	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and RoHS compliance, ensuring long-term availability and regulatory conformance. Selection between LNK6426D-TL and substitute models is determined by application power requirements and voltage margin specifications.

For 6.1W Applications: LNK6426D-TL (LinkSwitch™-3, 725V) and LNK6406D-TL (LinkSwitch™-3, 725V) provide identical electrical performance. LNK616DG-TL and LNK606DG-TL (LinkSwitch®-II, 700V) deliver equivalent 6.1W output with 25V lower breakdown voltage rating.

For Higher Power Requirements: LNK6407D-TL (LinkSwitch™-3, 7.5W, 725V) accommodates applications requiring increased power delivery while maintaining identical package and protection features.

For Lower Power Requirements: LNK6404D-TL (LinkSwitch™-3, 4.1W, 725V) serves applications with reduced power specifications within the same series and voltage class.

Series Considerations: LinkSwitch™-3 parts (LNK6426D-TL, LNK6407D-TL, LNK6406D-TL, LNK6404D-TL) operate at 725V breakdown voltage. LinkSwitch®-II parts (LNK616DG-TL, LNK606DG-TL) operate at 700V breakdown voltage. Both series maintain identical switching frequency, duty cycle, operating temperature range, and fault protection mechanisms.

All parts are RoHS compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can LNK6426D-TL be directly replaced with LNK6406D-TL?

A: Yes. Both parts are LinkSwitch™-3 series devices with identical 6.1W power rating, 725V breakdown voltage, 85kHz switching frequency, and 8-SOIC package. Electrical and mechanical compatibility is complete.

Q: What is the difference between LinkSwitch™-3 and LinkSwitch®-II series substitutes?

A: LinkSwitch™-3 parts (LNK6426D-TL, LNK6407D-TL, LNK6406D-TL, LNK6404D-TL) feature 725V breakdown voltage. LinkSwitch®-II parts (LNK616DG-TL, LNK606DG-TL) feature 700V breakdown voltage. All other electrical parameters, package geometry, and protection features remain identical. Series selection depends on application voltage margin requirements.

Q: Can LNK6426D-TL (6.1W) be replaced with LNK6407D-TL (7.5W)?

A: Yes, for applications where higher power capacity is acceptable. LNK6407D-TL provides 7.5W output versus 6.1W, with all other parameters identical. This substitution is valid when design specifications permit increased power delivery.

Q: Can LNK6426D-TL (6.1W) be replaced with LNK6404D-TL (4.1W)?

A: No. LNK6404D-TL delivers only 4.1W output power, which is insufficient for applications requiring 6.1W. This substitution is not valid for equivalent performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (LNK6407D-TL, LNK6406D-TL, LNK6404D-TL, LNK616DG-TL, LNK606DG-TL) are RoHS compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the package compatibility between LNK6426D-TL and substitute parts?

A: All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) surface mount package with 7 leads. PCB layout and footprint compatibility is complete across all listed substitutes.

Q: Which substitute part has the highest inventory availability?

A: LNK616DG-TL (LinkSwitch®-II, 6.1W, 700V) has the highest inventory at 67,700 pieces. LNK606DG-TL (LinkSwitch®-II, 6.1W, 700V) has 40,800 pieces. Both provide equivalent 6.1W performance with 700V breakdown voltage.

Q: Do all substitute parts operate at the same switching frequency?

A: Yes. All substitute parts operate at switching frequencies up to 85kHz with 55% duty cycle, identical to LNK6426D-TL.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across -40°C to 150°C junction temperature (TJ), identical to LNK6426D-TL.

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