LNK6408K-TL Equivalent & Substitute Parts

Part Overview

The LNK6408K-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the LinkSwitch™-3 series. This isolated power management IC integrates an internal switch for flyback topology applications with rated power output of 10 W and switching frequency up to 85 kHz. The device is designed for offline power supply applications requiring galvanic isolation and integrated protection features.

The LNK6408K-TL maintains Active product status with full RoHS compliance and REACH unaffected designation. Substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence within the LinkSwitch™-3 product family.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	LinkSwitch™-3
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	725V
Frequency - Switching	Up to 85 kHz
Power (Watts)	10 W
Duty Cycle	55%
Package / Case	12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 150°C (TJ)
Fault Protection	Current Limiting, Open Loop, Over Temperature, Short Circuit
RoHS Status	RoHS Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the LNK6408K-TL are identified within the LinkSwitch™-3 series based on the following substitution criteria:

Critical Matching Parameters:

Manufacturer: Power Integrations
Series: LinkSwitch™-3
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 725V
Frequency - Switching: Up to 85 kHz
Package / Case: 12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 150°C (TJ)
Fault Protection: Current Limiting, Open Loop, Over Temperature, Short Circuit
RoHS Status: RoHS Compliant
MSL Rating: 3 (168 Hours)

Variable Parameters (Allowed Differences):

Power (Watts): 9 W to 10 W
Duty Cycle: 55%
Base Product Number: LNK6407, LNK6408, LNK6428

The LNK6407K-TL and LNK6428K-TL are parametric equivalents with identical electrical and mechanical specifications except for power rating variations within the same functional class.

Parameter Comparison

Parameter	LNK6408K-TL	LNK6407K-TL	LNK6428K-TL
Manufacturer	Power Integrations	Power Integrations	Power Integrations
Series	LinkSwitch™-3	LinkSwitch™-3	LinkSwitch™-3
Topology	Flyback	Flyback	Flyback
Output Isolation	Isolated	Isolated	Isolated
Voltage - Breakdown	725V	725V	725V
Frequency - Switching	Up to 85 kHz	Up to 85 kHz	Up to 85 kHz
Power (Watts)	10 W	9 W	10 W
Duty Cycle	55%	55%	55%
Package / Case	12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad	12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad	12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Fault Protection	Current Limiting, Open Loop, Over Temperature, Short Circuit	Current Limiting, Open Loop, Over Temperature, Short Circuit	Current Limiting, Open Loop, Over Temperature, Short Circuit
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts—LNK6408K-TL, LNK6407K-TL, and LNK6428K-TL—are Active products from Power Integrations with identical compliance certifications. Selection between these parts is determined by power output requirements:

LNK6408K-TL (10 W): Primary selection for applications requiring 10 W output power. Current inventory: 7530 pcs.

LNK6407K-TL (9 W): Suitable for applications with 9 W power requirements. Highest inventory availability: 15800 pcs.

LNK6428K-TL (10 W): Alternative 10 W option. Lower inventory: 3300 pcs.

All parts share identical package specifications (12-BESOP), thermal operating range (-40°C to 150°C), and protection features. PCB layout and thermal management design remain unchanged across substitutions. RoHS compliance and MSL ratings are uniform across all three parts.

Frequently Asked Questions (FAQ)

Q: Can LNK6407K-TL replace LNK6408K-TL in a 10 W application?

A: No. The LNK6407K-TL is rated for 9 W maximum output power, while the LNK6408K-TL is rated for 10 W. Use LNK6407K-TL only in applications designed for 9 W or lower power output.

Q: Are the package footprints identical for all three parts?

A: Yes. All three parts use the 12-BESOP package with 0.350" (8.89mm) width, 11 leads, and exposed pad. PCB layouts are directly interchangeable.

Q: What is the difference between LNK6408K-TL and LNK6428K-TL?

A: Both parts are rated for 10 W output power and share identical electrical and mechanical specifications. The difference is in the base product number designation (LNK6408 vs. LNK6428). Selection between them depends on availability and supply chain requirements.

Q: Do all three parts meet RoHS compliance?

A: Yes. LNK6408K-TL, LNK6407K-TL, and LNK6428K-TL are all RoHS Compliant with REACH Unaffected status.

Q: What is the MSL rating and handling requirement?

A: All three parts have MSL 3 rating with 168-hour floor life. Standard moisture control procedures apply during storage and handling.

Q: Can these parts be used interchangeably in existing designs?

A: Interchangeability is limited to power rating compatibility. LNK6407K-TL (9 W) cannot substitute for LNK6408K-TL or LNK6428K-TL (10 W) in designs requiring 10 W output. LNK6408K-TL and LNK6428K-TL are interchangeable for 10 W applications.

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