LNK6666V Equivalent & Substitute Parts

Part Overview

The LNK6666V is an offline switch flyback converter IC manufactured by Power Integrations, part of the LinkSwitch™-HP series. This isolated power management IC operates at 120kHz to 136kHz switching frequency and delivers 34 watts of power in a 12-EDIP package. The device is designed for offline flyback topology applications requiring isolated output and integrated fault protection.

The LNK6666V maintains Active product status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters within the LinkSwitch™-HP series.

Substiute Parts

LNK6666V

Power IntegrationsIn Stock: 3472LNK6666V 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 LNK6666V are identified within the LinkSwitch™-HP series based on the following matching criteria:

Mandatory Matching Parameters:

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

Variable Parameter (Substitution Basis):

• Power (Watts): Varies by model within the series

The LNK6664V and LNK6768V are parametric equivalents that share all mandatory electrical and mechanical characteristics with the LNK6666V. The primary difference is output power rating, which allows selection based on specific application power requirements.

Parameter Comparison

Engineering Selection Recommendations

All three parts—LNK6666V, LNK6664V, and LNK6768V—are Active products with full RoHS compliance and REACH unaffected status. Selection between these devices is determined by application power requirements:

LNK6664V (28 W): Select for applications requiring lower power output. This device provides the lowest power rating within the equivalent group and is suitable for designs with reduced power delivery specifications.

LNK6666V (34 W): The reference device, suitable for mid-range power applications within the LinkSwitch™-HP series.

LNK6768V (47 W): Select for applications requiring higher power output. This device provides the highest power rating and is suitable for designs with elevated power delivery specifications. Note the Moisture Sensitivity Level (MSL) rating of 3 (168 Hours) compared to MSL 1 (Unlimited) for LNK6664V and LNK6666V.

All devices share identical electrical characteristics, package dimensions, mounting type, and fault protection features, ensuring direct functional compatibility within the specified power ranges.

Frequently Asked Questions (FAQ)

Q: Can the LNK6664V replace the LNK6666V in an existing design?

A: The LNK6664V is a parametric equivalent with identical electrical and mechanical characteristics except for power rating. It delivers 28 watts compared to the LNK6666V's 34 watts. Substitution is valid only if the application power requirement does not exceed 28 watts.

Q: Can the LNK6768V replace the LNK6666V in an existing design?

A: The LNK6768V is a parametric equivalent with identical electrical and mechanical characteristics except for power rating. It delivers 47 watts compared to the LNK6666V's 34 watts. Substitution is valid for applications requiring up to 47 watts of power output. The LNK6768V has Moisture Sensitivity Level 3 (168 Hours) versus MSL 1 (Unlimited) for the LNK6666V.

Q: Are all three devices pin-compatible?

A: Yes. All three devices use the 12-SDIP (0.412", 10.46mm) package with 11 leads and exposed pad. They are mechanically and electrically compatible for through-hole mounting on identical PCB layouts.

Q: What is the primary difference between these substitute parts?

A: The primary difference is output power rating. The LNK6664V, LNK6666V, and LNK6768V deliver 28 watts, 34 watts, and 47 watts respectively. All other electrical parameters, including switching frequency, breakdown voltage, duty cycle, operating temperature range, and fault protection features, are identical.

Q: Do all devices have the same fault protection features?

A: Yes. All three devices include current limiting, overload, over-temperature, over-voltage, and short-circuit protection.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: The LNK6664V and LNK6666V have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The LNK6768V has MSL 3 (168 Hours), indicating the device must be used within 168 hours of package opening under controlled humidity conditions. This affects storage and handling procedures but does not impact electrical performance.

Q: Are all devices RoHS compliant?

A: Yes. All three devices are RoHS compliant and REACH unaffected.