LNK6776V Equivalent & Substitute Parts

Part Overview

The LNK6776V 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 34W output power capability and integrated fault protection including current limiting, overload, overvoltage, and short circuit protection. The device is packaged in a 12-lead eDIP configuration with an exposed pad for thermal management.

Substitute parts are identified when design requirements change, such as increased output power demands, inventory constraints, or supply chain considerations, while maintaining compatibility with the same topology, package, and electrical operating parameters.

Substiute Parts

LNK6776V

Power IntegrationsIn Stock: 12332LNK6776V Datasheet

Current PartRFQ

LNK6777V

Power IntegrationsIn Stock: 3606LNK6777V Datasheet

Parametric EquivalentRFQ

LNK6779V

Power IntegrationsIn Stock: 11842LNK6779V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK6776V are qualified based on strict parameter alignment within the LinkSwitch™-HP product family. The following parameters must remain constant across all substitutes:

• Manufacturer: Power Integrations
• Series: LinkSwitch™-HP
• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 725V
• Switching Frequency: 120kHz ~ 136kHz
• Duty Cycle: 64%
• Package / Case: 12-SDIP (0.412", 10.46mm), 11 Leads, Exposed Pad
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit

The primary variable parameter distinguishing substitutes is output power rating. LNK6777V and LNK6779V provide higher power capability (41W and 54W respectively) while maintaining all other electrical and mechanical specifications. These parts are direct substitutes when increased power delivery is required within the same application topology and form factor.

Parameter Comparison

Engineering Selection Recommendations

All three parts—LNK6776V, LNK6777V, and LNK6779V—are active products with RoHS compliance and REACH unaffected status, suitable for current design implementations. Selection between these parts is determined by output power requirements:

LNK6776V (34W): Use when output power specification is 34W or lower. Highest inventory availability (12,300 pcs).

LNK6777V (41W): Use when output power specification requires 34W to 41W range. Intermediate inventory (3,500 pcs).

LNK6779V (54W): Use when output power specification requires 41W to 54W range. High inventory availability (11,778 pcs). Note: Moisture Sensitivity Level is MSL 3 (168 hours) compared to MSL 1 for LNK6776V and LNK6777V.

All parts share identical package footprints, pinouts, and thermal characteristics, enabling direct PCB-level substitution without layout modifications. The 12-SDIP through-hole package with exposed pad provides consistent thermal performance across all variants.

Frequently Asked Questions (FAQ)

Q: Can LNK6777V or LNK6779V be used as direct replacements for LNK6776V on existing PCBs?

A: Yes. All three parts use identical 12-SDIP (0.412", 10.46mm) through-hole packages with 11 leads and exposed pads. No PCB layout changes are required. Pin-to-pin compatibility is maintained across the entire substitute group.

Q: What is the primary difference between LNK6776V, LNK6777V, and LNK6779V?

A: Output power rating is the distinguishing parameter. LNK6776V delivers 34W, LNK6777V delivers 41W, and LNK6779V delivers 54W. All other electrical and mechanical specifications remain identical.

Q: Are there any compliance or certification differences between these parts?

A: All three parts are RoHS Compliant and REACH Unaffected. The primary difference is Moisture Sensitivity Level: LNK6776V and LNK6777V are MSL 1 (Unlimited), while LNK6779V is MSL 3 (168 hours). This affects storage and handling requirements but does not impact electrical performance.

Q: When should I select LNK6779V over LNK6776V?

A: Select LNK6779V when your application requires output power exceeding 34W up to 54W. The higher power rating accommodates increased load demands while maintaining the same switching frequency, topology, and protection features.

Q: Are these parts interchangeable in terms of thermal management?

A: Yes. All three parts feature identical package dimensions and exposed pad thermal design. Thermal performance on the PCB remains consistent across substitutions.

Q: What is the switching frequency range for all substitute parts?

A: All parts operate at 120kHz to 136kHz switching frequency with 64% duty cycle, ensuring compatibility with transformer and filter designs optimized for this frequency band.