LNK6666E Equivalent & Substitute Parts Reference

Part Overview

The LNK6666E 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 88W output power capability and is designed for offline flyback topology applications. The device is Active status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when design requirements necessitate different power output levels while maintaining electrical and mechanical compatibility within the LinkSwitch™-HP family.

Substiute Parts

LNK6666E

Power IntegrationsIn Stock: 22938LNK6666E Datasheet

Current PartRFQ

LNK6664E

Power IntegrationsIn Stock: 2934LNK6664E Datasheet

Parametric EquivalentRFQ

LNK6767E

Power IntegrationsIn Stock: 2475LNK6767E Datasheet

Parametric EquivalentRFQ

LNK6769E

Power IntegrationsIn Stock: 5644LNK6769E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK6666E are identified within the LinkSwitch™-HP series based on strict electrical and mechanical compatibility. All substitute parts share the following critical parameters with the main part:

Common Parameters (Substitution Basis):

• 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: 7-SSIP, 6 Leads, Exposed Pad, Formed Leads
• Supplier Device Package: eSIP-7C
• Mounting Type: Through Hole
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
• RoHS Status: RoHS Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Product Status: Active

Variable Parameter (Determines Substitution Suitability):

• Power (Watts): Differs across substitute parts

The LNK6666E (88W) can be substituted with LNK6664E (47W), LNK6767E (117W), or LNK6769E (153W) when power output requirements differ from the original specification. Selection depends on the actual power delivery requirement of the end application.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts (LNK6664E, LNK6767E, LNK6769E) maintain Active product status and full RoHS compliance, ensuring long-term availability and regulatory alignment with the LNK6666E. Selection among these parts is determined solely by the required power output specification:

• LNK6664E (47W): For applications requiring lower power delivery than the LNK6666E baseline
• LNK6666E (88W): Original specification
• LNK6767E (117W): For applications requiring higher power delivery than the LNK6666E baseline
• LNK6769E (153W): For applications requiring maximum power delivery within the LinkSwitch™-HP family

All parts are packaged in eSIP-7C through-hole configuration with identical pinout and thermal characteristics, enabling direct substitution at the board level when power requirements change. Compliance certifications (RoHS, REACH Unaffected, EAR99, HTSUS 8542.39.0001) are uniform across all parts.

Frequently Asked Questions (FAQ)

Q: Can LNK6664E replace LNK6666E in an existing design?

A: LNK6664E is electrically and mechanically compatible with LNK6666E. However, LNK6664E is rated for 47W output versus LNK6666E's 88W. Substitution is valid only if the application power requirement does not exceed 47W.

Q: What is the primary difference between LNK6666E and LNK6767E?

A: The primary difference is power output rating: LNK6666E is rated for 88W while LNK6767E is rated for 117W. All other electrical parameters, switching frequency, topology, package, and protection features are identical.

Q: Are all substitute parts pin-compatible with LNK6666E?

A: Yes. All substitute parts use the same 7-SSIP, 6-lead eSIP-7C package with exposed pad and formed leads, ensuring identical pinout and through-hole mounting compatibility.

Q: Can LNK6769E be used in place of LNK6666E?

A: LNK6769E is electrically and mechanically compatible with LNK6666E. LNK6769E is rated for 153W output, providing higher power capability. Substitution is valid from an electrical standpoint, though the higher power rating may not be necessary for all applications.

Q: Do all parts share the same operating temperature range?

A: Yes. All parts operate across -40°C to 150°C junction temperature range, ensuring thermal compatibility in equivalent thermal environments.

Q: What protection features are common across all parts?

A: All parts include Current Limiting, Over Load, Over Temperature, Over Voltage, and Short Circuit protection, providing identical fault protection coverage.

Q: Are there inventory differences between substitute parts?

A: Yes. Inventory levels vary: LNK6666E (22,863 pcs), LNK6767E (2,377 pcs), LNK6769E (5,580 pcs), and LNK6664E (2,848 pcs). Availability should be confirmed for production requirements.

Q: Do all parts meet the same regulatory standards?

A: Yes. All parts are RoHS Compliant, REACH Unaffected, classified as EAR99, and share HTSUS code 8542.39.0001, ensuring uniform regulatory compliance.