LNK6779K-TL Equivalent & Substitute Parts

Part Overview

The LNK6779K-TL 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 with a maximum power rating of 77W and is designed for offline flyback topology applications. The device features integrated current limiting, overload, over-temperature, over-voltage, and short-circuit protection. With active product status and full RoHS compliance, the LNK6779K-TL serves as a primary component in isolated power supply designs. Substitute parts are identified when equivalent electrical and mechanical parameters allow direct functional replacement while maintaining circuit performance and reliability.

Substiute Parts

LNK6779K-TL

Power IntegrationsIn Stock: 1014LNK6779K-TL Datasheet

Current PartRFQ

LNK6773K-TL

Power IntegrationsIn Stock: 2269LNK6773K-TL Datasheet

Parametric EquivalentRFQ

LNK6774K-TL

Power IntegrationsIn Stock: 35184LNK6774K-TL Datasheet

Parametric EquivalentRFQ

LNK6775K-TL

Power IntegrationsIn Stock: 5406LNK6775K-TL Datasheet

Parametric EquivalentRFQ

LNK6776K-TL

Power IntegrationsIn Stock: 12469LNK6776K-TL Datasheet

Parametric EquivalentRFQ

LNK6777K-TL

Power IntegrationsIn Stock: 10072LNK6777K-TL Datasheet

Parametric EquivalentRFQ

LNK6778K-TL

Power IntegrationsIn Stock: 19795LNK6778K-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK6779K-TL are identified based on strict equivalence of the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: Power Integrations
• Series: LinkSwitch™-HP
• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 725V
• Frequency - Switching: 120kHz ~ 136kHz
• Duty Cycle: 64%
• Package / Case: 12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
• Mounting Type: Surface Mount
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
• Operating Temperature: -40°C ~ 150°C (TJ)
• RoHS Status: RoHS Compliant
• Moisture Sensitivity Level (MSL): 3 (168 Hours)
• Product Status: Active

Variable Parameter (Substitution Basis):

• Power (Watts): Ranges from 35W to 77W across the LinkSwitch™-HP family

All substitute parts maintain identical electrical characteristics, protection features, thermal specifications, and packaging. The primary distinction is maximum power rating, which determines application suitability based on load requirements.

Parameter Comparison

Engineering Selection Recommendations

Substitution Criteria:

All substitute parts listed maintain identical electrical specifications, protection architecture, thermal operating range, and package footprint. Selection between LNK6779K-TL and its substitutes is determined solely by application power requirements.

For Lower Power Applications (≤68W): Use LNK6778K-TL (68W), LNK6777K-TL (59W), LNK6776K-TL (48W), LNK6775K-TL (42W), LNK6774K-TL (39W), or LNK6773K-TL (35W) based on exact load specifications. These parts provide equivalent protection, isolation, and thermal performance with reduced power headroom.

For 77W Applications: LNK6779K-TL is the specified component. No substitution is required or appropriate for this power level within the LinkSwitch™-HP series.

Compliance Assurance: All parts maintain RoHS compliance, REACH unaffected status, and MSL 3 moisture sensitivity rating. All devices are active products from Power Integrations with identical fault protection features: current limiting, overload protection, over-temperature shutdown, over-voltage clamping, and short-circuit detection.

Package Compatibility: All substitute parts use identical 12-BESOP surface-mount packaging with 11 leads and exposed pad. PCB footprints and thermal management layouts are directly interchangeable.

Frequently Asked Questions (FAQ)

Q: Can LNK6778K-TL replace LNK6779K-TL in a 77W application?

A: No. LNK6778K-TL is rated for 68W maximum power. Using an undersized component in a 77W application exceeds the device's power rating and violates design specifications. Component selection must match or exceed application power requirements.

Q: Are all substitute parts pin-compatible with LNK6779K-TL?

A: Yes. All parts in the LinkSwitch™-HP series use identical 12-BESOP packaging with 11 leads and exposed pad. Pin assignments and PCB footprints are directly compatible.

Q: What is the primary difference between LNK6779K-TL and LNK6773K-TL?

A: The primary difference is maximum power rating: LNK6779K-TL is rated for 77W, while LNK6773K-TL is rated for 35W. All other electrical parameters, protection features, switching frequency, breakdown voltage, operating temperature range, and package specifications are identical.

Q: Can I use LNK6779K-TL in place of a lower-rated part like LNK6774K-TL?

A: Yes. LNK6779K-TL (77W) can be used in applications designed for LNK6774K-TL (39W) because it provides greater power capacity. The higher-rated device will operate within its specifications in lower-power applications. However, this substitution may increase component cost and board space utilization without functional benefit.

Q: Are thermal management requirements identical across all substitute parts?

A: Yes. All parts operate across the same temperature range (-40°C to 150°C junction temperature) and include identical over-temperature protection. Thermal design considerations for PCB layout and heat dissipation remain consistent across the entire LinkSwitch™-HP family.

Q: What certifications apply to all substitute parts?

A: All parts are RoHS compliant, REACH unaffected, and classified as EAR99 for export control purposes. All devices carry MSL 3 moisture sensitivity rating with 168-hour floor life. All parts maintain active product status from Power Integrations.

Q: Is there a performance difference in switching frequency between substitute parts?

A: No. All parts operate at identical switching frequency range of 120kHz to 136kHz. Frequency stability and control characteristics are equivalent across the entire LinkSwitch™-HP series.