LNK6669V Equivalent & Substitute Parts

Part Overview

The LNK6669V is an offline switch flyback converter IC from Power Integrations' LinkSwitch™-HP series, designed for isolated power supply applications. This active product operates at 120kHz to 136kHz switching frequency with 54W power output capability and integrated fault protection including current limiting, overload, over-temperature, over-voltage, and short-circuit protection. The device is housed in a 12-SDIP eDIP-12 package with through-hole mounting.

Substitute parts are identified when design requirements change, inventory constraints occur, or application specifications shift within the allowed parameter ranges for this product category.

Substiute Parts

LNK6669V

Power IntegrationsIn Stock: 855LNK6669V Datasheet

Current PartRFQ

LNK6664V

Power IntegrationsIn Stock: 35437LNK6664V Datasheet

Parametric EquivalentRFQ

LNK6768V

Power IntegrationsIn Stock: 6170LNK6768V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK6669V are qualified based on strict parameter matching within the LinkSwitch™-HP series. The following parameters must remain constant across all substitutes:

Fixed Parameters (No Variation Allowed):

• Manufacturer: Power Integrations
• Series: LinkSwitch™-HP
• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 650V
• Frequency - Switching: 120kHz ~ 136kHz
• Duty Cycle: 64%
• Operating Temperature: -40°C ~ 150°C (TJ)
• Package / Case: 12-SDIP (0.412", 10.46mm), 11 Leads, Exposed Pad
• Mounting Type: Through Hole
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
• Product Status: Active
• RoHS Status: RoHS Compliant

Variable Parameter (Allows Substitution):

• Power (Watts): 28W to 54W range

The LNK6664V and LNK6768V are parametric equivalents that maintain all critical electrical and mechanical specifications while offering different power output ratings suitable for applications with lower or intermediate power requirements.

Parameter Comparison

Engineering Selection Recommendations

LNK6664V Selection Criteria: The LNK6664V is suitable for applications requiring 28W maximum output power. This substitute maintains identical electrical characteristics, switching frequency, topology, and fault protection as the LNK6669V. The LNK6664V offers superior moisture sensitivity rating (MSL 1 vs. MSL 3), providing extended shelf life and reduced moisture absorption risk. High inventory availability (35,400 units) supports production schedules. Select this part when power requirements do not exceed 28W and extended storage conditions are anticipated.

LNK6768V Selection Criteria: The LNK6768V is suitable for applications requiring 47W maximum output power. This substitute maintains all critical electrical specifications and package compatibility with the LNK6669V. The LNK6768V bridges the power gap between the LNK6664V and LNK6669V, offering intermediate power capability. Inventory availability (6,100 units) supports standard production volumes. Select this part when power requirements fall between 28W and 54W.

All three parts maintain active product status, RoHS compliance, and identical fault protection architecture. Selection is determined solely by application power requirements within the 28W to 54W range.

Frequently Asked Questions (FAQ)

Q: Can LNK6664V replace LNK6669V in all applications? A: The LNK6664V is a parametric equivalent only for applications requiring maximum 28W output power. The LNK6669V is rated for 54W. If your application requires more than 28W, the LNK6664V is not suitable. Verify your actual power requirement before substitution.

Q: What is the difference between LNK6768V and LNK6669V? A: The LNK6768V is rated for 47W output power, while the LNK6669V is rated for 54W. All other electrical parameters, switching frequency, topology, package, and fault protection are identical. The LNK6768V is suitable for applications requiring up to 47W.

Q: Are all three parts pin-compatible? A: Yes. The LNK6669V, LNK6664V, and LNK6768V all use the 12-SDIP (0.412", 10.46mm) package with 11 leads and exposed pad. They are mechanically and electrically pin-compatible for through-hole mounting.

Q: What does MSL 1 vs. MSL 3 mean for the LNK6664V? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture absorption concerns. MSL 3 indicates a 168-hour limit before moisture absorption becomes a factor. The LNK6664V's superior MSL rating provides longer storage capability without special handling.

Q: Can I use LNK6768V if my application only needs 30W? A: Yes. The LNK6768V is rated for 47W maximum output, so it operates safely at 30W. All electrical characteristics remain identical across the power range. Select based on your maximum required power output.

Q: Are all three parts RoHS compliant? A: Yes. The LNK6669V, LNK6664V, and LNK6768V are all RoHS compliant and REACH unaffected.

Q: What is the switching frequency range for all three parts? A: All three parts operate at 120kHz to 136kHz switching frequency. This parameter is fixed across all substitutes.

Q: Do all three parts have the same fault protection? A: Yes. Current limiting, overload, over-temperature, over-voltage, and short-circuit protection are identical across LNK6669V, LNK6664V, and LNK6768V.