LNK403EG LED Driver IC Equivalent & Substitute Parts

Part Overview

The LNK403EG is an AC DC offline switcher LED driver IC manufactured by Power Integrations, operating in the LinkSwitch®-PH series. This device integrates an internal switch and operates across a wide supply voltage range of 36V to 725V, making it suitable for offline lighting applications with Triac dimming capability. The part is currently in active production status with 17,100 units in stock.

Substitute parts are identified when equivalent functional performance can be achieved through alternative topologies, supply voltage ranges, or output configurations while maintaining compatibility with LED driver applications and dimming requirements.

Substiute Parts

LNK403EG

Power IntegrationsIn Stock: 17206LNK403EG Datasheet

Current PartRFQ

AL1677-05BS-13

Diodes IncorporatedIn Stock: 25236AL1677-05BS-13 Datasheet

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AL1677-20BS-13

Diodes IncorporatedIn Stock: 6780AL1677-20BS-13 Datasheet

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FL7701MX

Fairchild SemiconductorIn Stock: 5819FL7701MX Datasheet

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LT3799IMSE#PBF

Analog Devices Inc.In Stock: 2589LT3799IMSE#PBF Datasheet

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MP4068GS-Z

Monolithic Power Systems Inc.In Stock: 276717MP4068GS-Z Datasheet

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NCL30082DDR2G

onsemiIn Stock: 20247NCL30082DDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the LNK403EG is based on the following critical parameters:

Primary Substitution Criteria:

• Type: AC DC Offline Switcher
• Applications: Lighting
• Dimming capability: Triac dimming support
• Number of Outputs: 1
• Product Status: Active

Secondary Compatibility Factors:

• Topology: Flyback topology preferred for direct substitution; Step-Down (Buck) or Step-Up (Boost) topologies acceptable for specific application requirements
• Internal Switch requirement: Devices with or without internal switches may substitute depending on circuit design
• Operating Temperature range: Minimum -40°C support required
• RoHS Compliance: ROHS3 or RoHS Compliant status required

Voltage Supply Considerations: The LNK403EG operates across 36V to 725V. Substitute parts with lower voltage ranges (8.5V to 20V) are grouped separately as they address different input voltage applications but maintain LED driver functionality.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Flyback Topology with Triac Dimming):

The LT3799IMSE#PBF from Analog Devices Inc. provides the closest functional equivalence to the LNK403EG. Both devices employ Flyback topology with Triac dimming capability for LED driver applications. The LT3799IMSE#PBF maintains active product status and ROHS3 compliance. Primary design consideration is the transition from through-hole (eSIP-7C) to surface-mount (16-MSOP-EP) packaging, requiring PCB layout modification. Operating temperature range of -40°C to 125°C (TJ) is suitable for most lighting applications, though 25°C lower than the LNK403EG maximum.

Alternative Substitution (Buck Topology, Lower Voltage Range):

The MP4068GS-Z from Monolithic Power Systems Inc. operates with Triac dimming and AC DC offline switcher topology. This device features a lower supply voltage range (4.1V to 5V) compared to the LNK403EG (36V to 725V), making it suitable for applications with reduced input voltage requirements. The device is active, ROHS3 compliant, and available in high inventory (276,700 units). Surface-mount 8-SOIC-7A packaging requires PCB redesign.

Secondary Alternatives (Dimming Capability Variations):

The NCL30082DDR2G from onsemi provides Flyback topology with dual dimming modes (Analog and PWM), offering flexibility beyond Triac-only dimming. Active product status and ROHS3 compliance are confirmed. The AL1677 series (both 05BS and 20BS variants) from Diodes Incorporated support LED driver applications with Step-Down topology but lack Triac dimming capability, suitable only for non-dimming lighting designs.

Compliance and Availability:

All identified substitute parts maintain active product status and RoHS compliance (ROHS3 or equivalent). Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 3 (168 hours), with the LNK403EG and LT3799IMSE#PBF offering superior moisture tolerance. Inventory availability is confirmed for all substitutes, with MP4068GS-Z showing the highest stock level (276,700 units).

Frequently Asked Questions (FAQ)

Q: Can the LT3799IMSE#PBF directly replace the LNK403EG without circuit modification?

A: The LT3799IMSE#PBF shares Flyback topology and Triac dimming functionality with the LNK403EG, maintaining core LED driver performance. However, packaging differs significantly (16-MSOP-EP surface mount versus eSIP-7C through hole), requiring PCB layout redesign. Voltage supply specifications are not provided for the LT3799IMSE#PBF, necessitating verification against your specific input voltage requirements before implementation.

Q: What is the primary difference between the LNK403EG and MP4068GS-Z?

A: The LNK403EG operates across a wide supply voltage range (36V to 725V) using Flyback topology with an internal switch. The MP4068GS-Z operates at lower supply voltages (4.1V to 5V) using Step-Down/Step-Up (Buck/Boost) topology without an internal switch. Both support Triac dimming for LED applications. Selection depends on your input voltage specification and circuit design requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts maintain either RoHS Compliant or ROHS3 Compliant status. The LNK403EG is RoHS Compliant, while LT3799IMSE#PBF, MP4068GS-Z, and NCL30082DDR2G are ROHS3 Compliant. ROHS3 represents the current regulatory standard and is fully compatible with RoHS Compliant requirements.

Q: What packaging considerations apply when substituting the LNK403EG?

A: The LNK403EG uses through-hole eSIP-7C packaging. All identified substitutes employ surface-mount technology (16-MSOP-EP, 8-SOIC, or 8-SOIC-7A). Surface-mount substitution requires PCB redesign including new footprint layout, trace routing, and solder reflow process validation. Through-hole to surface-mount conversion is not a pin-compatible swap.

Q: Which substitute part offers the best moisture tolerance?

A: The LNK403EG and LT3799IMSE#PBF both feature MSL 1 (Unlimited) moisture sensitivity level, providing superior moisture tolerance compared to MP4068GS-Z (MSL 2, 1 Year) and NCL30082DDR2G (MSL 3, 168 Hours). MSL 1 rating eliminates moisture-related handling restrictions during assembly and storage.

Q: Can the AL1677 series substitute for Triac dimming applications?

A: No. The AL1677-05BS-13 and AL1677-20BS-13 do not support Triac dimming; both are specified as "No Dimming" devices. These parts are suitable only for non-dimming LED driver applications. For applications requiring Triac dimming functionality, select LT3799IMSE#PBF, MP4068GS-Z, or NCL30082DDR2G.

Q: What is the operating temperature advantage of the LNK403EG?

A: The LNK403EG operates to 150°C (TJ), providing 25°C higher maximum temperature than LT3799IMSE#PBF and NCL30082DDR2G (125°C), and 45°C higher than AL1677 series (105°C). This extended temperature range is beneficial for high-ambient or high-power lighting applications where thermal stress is elevated.

Q: Are substitute parts available in equivalent quantities to the LNK403EG stock level?

A: The LNK403EG has 17,100 units in stock. MP4068GS-Z offers significantly higher availability (276,700 units). LT3799IMSE#PBF (2,500 units) and AL1677-20BS-13 (6,700 units) have lower stock levels. AL1677-05BS-13 and NCL30082DDR2G maintain moderate inventory (25,200 and 20,200 units respectively). Verify current availability with your supplier for production requirements.