LNK6436D-TL Equivalent & Substitute Parts

Part Overview

The LNK6436D-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 package. The device integrates internal switching functionality with comprehensive fault protection including current limiting, open loop control, over-temperature, and short-circuit protection. Product status is Active with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements permit tolerance of parameter variations within the same package, topology, and electrical operating range. Alternative models may be necessary due to inventory availability, supply chain constraints, or design flexibility in power output specifications.

Key Parameters

Parameter	Value	Unit
Topology	Flyback	—
Output Isolation	Isolated	—
Voltage - Breakdown	725	V
Frequency - Switching	Up to 85	kHz
Power (Watts)	6.1	W
Duty Cycle	55	%
Operating Temperature	-40 to 150	°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width), 7 Leads	—
Mounting Type	Surface Mount	—
Internal Switch(s)	Yes	—
Fault Protection	Current Limiting, Open Loop, Over Temperature, Short Circuit	—

Substitute Part Grouping Explanation

Substitute parts for the LNK6436D-TL are classified based on strict parameter alignment within the following criteria:

Primary Substitution Criteria:

Topology: Flyback (isolated converter)
Package: 8-SOIC (0.154", 3.90mm Width), 7 Leads, SO-8C supplier package
Mounting: Surface Mount
Switching Frequency: Up to 85kHz
Duty Cycle: 55%
Operating Temperature Range: -40°C to 150°C (TJ)
Fault Protection: Current Limiting, Open Loop, Over Temperature, Short Circuit
Output Isolation: Isolated
Internal Switch: Yes
RoHS Compliance: Yes
MSL Rating: 1 (Unlimited)

Allowable Parameter Variance:

Voltage - Breakdown: 700V to 725V (acceptable range for offline switch applications)
Power Output: 4.1W to 7.5W (design-dependent; lower ratings require load reduction; higher ratings provide margin)
Series Designation: LinkSwitch™-3 or LinkSwitch®-II (both active product lines from Power Integrations)

All substitute parts maintain identical package geometry, thermal characteristics, and protection feature sets. Substitution is valid when the application power requirement does not exceed the substitute part's rated output power.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage - Breakdown (V)	Power (W)	Frequency - Switching (kHz)	Package	Inventory (Pcs)	Product Status
LNK6436D-TL	Power Integrations	LinkSwitch™-3	725	6.1	Up to 85	8-SOIC, 7 Leads	700	Active
LNK6407D-TL	Power Integrations	LinkSwitch™-3	725	7.5	Up to 85	8-SOIC, 7 Leads	15700	Active
LNK6406D-TL	Power Integrations	LinkSwitch™-3	725	6.1	Up to 85	8-SOIC, 7 Leads	3103	Active
LNK6404D-TL	Power Integrations	LinkSwitch™-3	725	4.1	Up to 85	8-SOIC, 7 Leads	1782	Active
LNK616DG-TL	Power Integrations	LinkSwitch®-II	700	6.1	Up to 85	8-SOIC, 7 Leads	67700	Active
LNK606DG-TL	Power Integrations	LinkSwitch®-II	700	6.1	Up to 85	8-SOIC, 7 Leads	40800	Active

Engineering Selection Recommendations

LNK6407D-TL (7.5W Output)

Highest power rating among substitutes; suitable for designs requiring margin above 6.1W specification
LinkSwitch™-3 series alignment with main part
725V breakdown voltage matches LNK6436D-TL
Highest inventory availability (15,700 pcs)
Active product status with full compliance certifications

LNK6406D-TL (6.1W Output)

Identical power rating to LNK6436D-TL
LinkSwitch™-3 series alignment
725V breakdown voltage matches main part
Direct functional equivalent with lower inventory (3,103 pcs)
Active product status with full compliance certifications

LNK6404D-TL (4.1W Output)

Lower power rating; suitable only for designs with maximum load ≤4.1W
LinkSwitch™-3 series alignment
725V breakdown voltage matches main part
Limited inventory (1,782 pcs)
Active product status with full compliance certifications

LNK616DG-TL (6.1W Output)

Identical power rating to LNK6436D-TL
LinkSwitch®-II series (previous generation, active status maintained)
700V breakdown voltage (25V lower than main part; acceptable for offline applications)
Highest inventory availability (67,700 pcs)
Active product status with full compliance certifications

LNK606DG-TL (6.1W Output)

Identical power rating to LNK6436D-TL
LinkSwitch®-II series (previous generation, active status maintained)
700V breakdown voltage (25V lower than main part; acceptable for offline applications)
High inventory availability (40,800 pcs)
Active product status with full compliance certifications

All substitute parts maintain RoHS compliance, MSL 1 rating, and identical package/mounting specifications. Selection should prioritize inventory availability and power margin requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can LNK6404D-TL replace LNK6436D-TL in all applications?

A: No. LNK6404D-TL has a maximum power output of 4.1W compared to 6.1W for LNK6436D-TL. Substitution is valid only when the application load does not exceed 4.1W. Exceeding this power rating will result in thermal stress and potential device failure.

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

A: Both series are active products from Power Integrations. LinkSwitch™-3 represents the current generation (LNK6436D-TL, LNK6407D-TL, LNK6406D-TL, LNK6404D-TL). LinkSwitch®-II represents the previous generation (LNK616DG-TL, LNK606DG-TL). All parts maintain identical package, topology, and protection features. Series selection does not affect package compatibility or mounting procedures.

Q: Why do LNK616DG-TL and LNK606DG-TL have 700V breakdown voltage instead of 725V?

A: The 25V difference reflects design variations between LinkSwitch®-II and LinkSwitch™-3 series. For offline flyback converter applications, both 700V and 725V ratings are acceptable and provide equivalent safety margins above typical AC mains voltage stress conditions. This parameter difference does not prevent substitution.

Q: Are all substitute parts in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package with 7 leads and SO-8C supplier designation. Package geometry, pin spacing, and PCB footprint are identical across all parts. No layout modifications are required for substitution.

Q: Which substitute part has the best inventory availability?

A: LNK616DG-TL has the highest inventory with 67,700 pcs in stock, followed by LNK606DG-TL with 40,800 pcs. Both LinkSwitch®-II series parts offer superior availability compared to LinkSwitch™-3 alternatives.

Q: Can I use LNK6407D-TL (7.5W) in place of LNK6436D-TL (6.1W)?

A: Yes. LNK6407D-TL has higher power rating and provides additional thermal margin. All other electrical parameters, package specifications, and protection features are identical. This substitution is valid for all applications designed for LNK6436D-TL.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry RoHS compliance certification with MSL 1 (Unlimited) moisture sensitivity rating. REACH status is REACH Unaffected for all parts. Compliance certifications are identical across the substitution group.

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) range. This specification is identical to LNK6436D-TL and does not vary across the substitution group.

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