LNK6773E Equivalent & Substitute Parts

Part Overview

The LNK6773E 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 35W and is designed for offline flyback topology applications. The device is currently in active production status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Alternative part numbers within the LinkSwitch™-HP family are available to accommodate different power output requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

LNK6773E

Power IntegrationsIn Stock: 3432LNK6773E Datasheet

Current PartRFQ

LNK6777E

Power IntegrationsIn Stock: 3138LNK6777E Datasheet

Parametric EquivalentRFQ

LNK6778E

Power IntegrationsIn Stock: 3496LNK6778E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LNK6773E is determined by strict adherence to the following electrical and mechanical parameters:

Critical 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: 7-SSIP, 6 Leads, Exposed Pad, Formed Leads
• Supplier Device Package: eSIP-7C
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit

Variable Parameter (Application-Dependent):

• Power (Watts): Differs by part number; selection depends on application requirements

The substitute parts LNK6777E and LNK6778E maintain identical electrical characteristics and mechanical specifications as the LNK6773E. The primary distinction is the maximum power rating, which varies to accommodate different output power requirements within the same package and topology constraints.

Parameter Comparison

Engineering Selection Recommendations

All three parts—LNK6773E, LNK6777E, and LNK6778E—are active production components with identical compliance certifications (RoHS Compliant, REACH Unaffected, MSL 1). Selection between these parts is determined solely by the maximum power output requirement of the application:

• LNK6773E: 35W maximum power output
• LNK6777E: 117W maximum power output
• LNK6778E: 135W maximum power output

All substitute parts share identical electrical specifications (725V breakdown voltage, 120kHz–136kHz switching frequency, 64% duty cycle), mechanical packaging (eSIP-7C, 7-SSIP through-hole), and thermal operating range (-40°C to 150°C). Substitution is valid when the application power requirement does not exceed the selected part's maximum power rating. No design modifications, PCB layout changes, or thermal management adjustments are required when substituting between these parts, provided the power rating is appropriate for the application.

Frequently Asked Questions (FAQ)

Q: Can LNK6777E or LNK6778E be used as direct replacements for LNK6773E?

A: Yes, both LNK6777E and LNK6778E are direct mechanical and electrical substitutes for LNK6773E. All three parts use identical eSIP-7C packaging, through-hole mounting, and share the same electrical specifications (725V breakdown, 120kHz–136kHz switching frequency, 64% duty cycle). The primary difference is maximum power rating. Substitution is valid when the application power requirement does not exceed the selected part's rating.

Q: What is the difference between LNK6773E, LNK6777E, and LNK6778E?

A: The three parts are members of the LinkSwitch™-HP series with identical topology, isolation, protection features, and packaging. The only difference is maximum power output: LNK6773E (35W), LNK6777E (117W), and LNK6778E (135W). All other electrical and mechanical parameters are identical.

Q: Are there any PCB layout or thermal considerations when substituting between these parts?

A: No design modifications are required. All three parts use the same eSIP-7C package with 6 leads and exposed pad, identical through-hole mounting, and the same operating temperature range (-40°C to 150°C). Existing PCB layouts and thermal designs are compatible across all three part numbers.

Q: Do all three parts have the same fault protection features?

A: Yes. LNK6773E, LNK6777E, and LNK6778E all include identical fault protection: current limiting, overload protection, over-temperature protection, over-voltage protection, and short-circuit protection.

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

A: No. All three parts are RoHS Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Compliance certifications are identical across all substitute options.

Q: Which part should I select for my application?

A: Select the part with the lowest maximum power rating that meets or exceeds your application's power requirement. For applications requiring 35W or less, LNK6773E is appropriate. For 35W to 117W, use LNK6777E. For 117W to 135W, use LNK6778E. All three parts are electrically and mechanically interchangeable within their respective power ratings.