FL6632MX LED Driver IC - Equivalent & Substitute Parts

Part Overview

The FL6632MX is an AC DC offline switcher LED driver IC manufactured by onsemi, designed for lighting applications using flyback topology. This 8-SOIC surface mount device operates from 80VAC to 308VAC input and delivers 18V output at 65kHz switching frequency. The product is currently obsolete, making equivalent substitute parts necessary for new designs, production continuity, and system upgrades. Substitute parts must maintain compatibility with the offline switcher topology, surface mount or compatible packaging, and lighting application requirements.

Substiute Parts

FL6632MX

onsemiIn Stock: 1039FL6632MX Datasheet

Current PartRFQ

FL7733AMX

onsemiIn Stock: 40232FL7733AMX Datasheet

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LNK408LG

Power IntegrationsIn Stock: 1100LNK408LG Datasheet

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LNK410EG

Power IntegrationsIn Stock: 17347LNK410EG Datasheet

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LT3799EMSE#TRPBF

Analog Devices Inc.In Stock: 3688LT3799EMSE#TRPBF Datasheet

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LT3799IMSE#PBF

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

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MP4060GS-Z

Monolithic Power Systems Inc.In Stock: 2909MP4060GS-Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the FL6632MX is based on the following critical parameters:

• Type & Topology: All substitutes must be AC DC offline switcher devices with flyback topology to maintain circuit compatibility and power conversion architecture.
• Application: Lighting application requirement is maintained across all substitutes.
• Package Compatibility: Primary substitutes use 8-SOIC surface mount packaging (FL7733AMX, MP4060GS-Z) for direct PCB compatibility. Secondary substitutes use alternative packages (eSIP-7F, eSIP-7C, 16-MSOP-EP) requiring board redesign but maintaining functional equivalence.
• Voltage Supply Range: Input voltage range 80VAC–308VAC is the baseline. Substitutes with wider ranges (36V–725V) provide extended application flexibility.
• Dimming Capability: The FL6632MX does not specify dimming. Substitutes include analog dimming (FL7733AMX) and triac dimming (LNK408LG, LNK410EG, LT3799EMSE#TRPBF, LT3799IMSE#PBF, MP4060GS-Z) for enhanced functionality in dimming-capable lighting systems.
• Internal Switch: The FL6632MX has no internal switch. Substitutes maintain this characteristic (FL7733AMX, LT3799EMSE#TRPBF, LT3799IMSE#PBF, MP4060GS-Z) or include internal switches (LNK408LG, LNK410EG) for different circuit topologies.

Parameter Comparison

Engineering Selection Recommendations

Direct Package Replacement (8-SOIC Surface Mount):

FL7733AMX and MP4060GS-Z are direct 8-SOIC surface mount replacements requiring minimal PCB redesign. FL7733AMX is an active onsemi product with ROHS3 compliance and analog dimming capability. MP4060GS-Z is an active Monolithic Power Systems device with ROHS3 compliance and triac dimming, operating within the 200VAC–265VAC range suitable for standard AC line input applications.

Extended Functionality Substitutes (Surface Mount, Alternative Packages):

LT3799EMSE#TRPBF and LT3799IMSE#PBF are active Analog Devices products in 16-MSOP-EP surface mount packages with ROHS3 compliance. These devices provide triac dimming and extended frequency range (25kHz–300kHz), requiring PCB layout modifications but offering superior dimming performance for lighting applications.

Through-Hole Alternatives (eSIP Packages):

LNK408LG and LNK410EG are active Power Integrations LinkSwitch-PH series devices in eSIP packages with RoHS compliance, internal switches, and triac dimming. These require board redesign from surface mount to through-hole but provide the widest input voltage range (36V–725V) and highest current ratings (2.39A and 4.9A respectively), suitable for high-power lighting systems.

Compliance & Status:

All substitute parts are active products with current RoHS or ROHS3 compliance, ensuring regulatory alignment and supply chain continuity. The FL6632MX obsolescence necessitates migration to one of these active alternatives for new production and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can FL7733AMX directly replace FL6632MX on the existing PCB?

A: FL7733AMX uses the same 8-SOIC package as FL6632MX, enabling direct PCB placement. However, the output voltage range differs (FL7733AMX: 1.5V–5V vs. FL6632MX: 18V), requiring circuit design verification to confirm compatibility with your output transformer and load specifications.

Q: What is the key difference between LNK408LG and LNK410EG?

A: Both are Power Integrations LinkSwitch-PH series devices with identical topology and dimming capability. The primary difference is current rating: LNK408LG provides 2.39A output current, while LNK410EG provides 4.9A. Selection depends on your lighting system's power requirements.

Q: Why do LT3799EMSE#TRPBF and LT3799IMSE#PBF have different packaging designations?

A: Both use the same 16-MSOP-EP package but differ in packaging format: LT3799EMSE#TRPBF is supplied in Tape & Reel (TR) format for automated assembly, while LT3799IMSE#PBF is supplied in Tube format for manual handling. Electrical specifications are identical.

Q: Is MP4060GS-Z suitable for 80VAC–308VAC input range?

A: MP4060GS-Z operates within 200VAC–265VAC, which covers standard AC line input but does not extend to the full 80VAC minimum of the FL6632MX. Verify your application's minimum input voltage requirement before selection.

Q: Do all substitutes support triac dimming?

A: No. FL7733AMX supports analog dimming only. LNK408LG, LNK410EG, LT3799EMSE#TRPBF, LT3799IMSE#PBF, and MP4060GS-Z all support triac dimming. Select based on your dimming control architecture.

Q: What mounting considerations apply when switching from FL6632MX to LNK408LG or LNK410EG?

A: FL6632MX is surface mount (8-SOIC), while LNK408LG and LNK410EG are through-hole (eSIP packages). This requires PCB redesign, including via placement, trace routing, and mechanical support for formed leads. Evaluate design effort against performance benefits before selection.