LNK403LG Equivalent & Substitute Parts

Part Overview

The LNK403LG 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 active in production status with 5200 units in stock. Alternative models are necessary when specific packaging requirements, mounting types, or supply voltage ranges differ from the LNK403LG specifications, or when component availability constraints require substitution.

Substiute Parts

LNK403LG

Power IntegrationsIn Stock: 5218LNK403LG Datasheet

Current PartRFQ

HVLED815PFTR

STMicroelectronicsIn Stock: 39366HVLED815PFTR Datasheet

SimilarRFQ

MP4032-1GS

Monolithic Power Systems Inc.In Stock: 5672MP4032-1GS Datasheet

SimilarRFQ

TPS92074DDCR

Texas InstrumentsIn Stock: 3932TPS92074DDCR Datasheet

SimilarRFQ

TPS92210DR

Texas InstrumentsIn Stock: 32942TPS92210DR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK403LG is determined by the following critical parameters: AC DC offline switcher topology, flyback converter design, internal switch integration, single output configuration, Triac dimming capability, and operating temperature range. The supply voltage range (36V to 725V) is a primary differentiator for the LNK403LG, as it accommodates universal AC input applications. Substitute parts are grouped based on matching these core functional characteristics while accounting for variations in mounting type (through-hole versus surface mount), package form factor, and secondary electrical specifications such as frequency and MSL rating.

The four substitute parts listed—HVLED815PFTR, TPS92210DR, TPS92074DDCR, and MP4032-1GS—each maintain the AC DC offline switcher classification and single-output LED driver function. However, each substitute exhibits trade-offs in supply voltage range, mounting technology, package type, and dimming methodology that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

LNK403LG Primary Application Context: The LNK403LG is optimized for universal AC input offline lighting applications requiring wide supply voltage tolerance (36V to 725V). Its through-hole eSIP-7F package and Triac dimming support make it suitable for traditional PCB assembly methods and legacy dimmer compatibility.

HVLED815PFTR Substitution: This STMicroelectronics part maintains flyback topology and Triac dimming but operates at significantly lower supply voltages (11.5V to 23V). Substitution is valid only for applications with constrained input voltage ranges. The 16-SOIC surface-mount package requires redesigned PCB layouts. Higher operating frequency (166kHz) may reduce transformer size but increases EMI considerations. MSL rating of 3 requires controlled storage conditions.

TPS92210DR Substitution: Texas Instruments TPS92210DR provides Triac dimming and flyback topology within a narrower supply voltage window (9V to 20V). The absence of an internal switch requires external switching circuitry, increasing component count and design complexity. The 8-SOIC surface-mount package and unlimited MSL rating (1) offer manufacturing advantages. This part is suitable for applications where external switch integration is acceptable and supply voltage remains below 20V.

TPS92074DDCR Substitution: This Texas Instruments device employs step-down/step-up (buck-boost) topology rather than flyback, representing a fundamental architectural change. The absence of internal switch and unspecified dimming capability indicate this part addresses different application requirements. Supply voltage range (11V to 18V) is the most restrictive among substitutes. Substitution requires comprehensive circuit redesign and is not recommended for direct replacement scenarios.

MP4032-1GS Substitution: Monolithic Power Systems MP4032-1GS maintains flyback topology, internal switch integration, and Triac dimming. Supply voltage range (10.3V to 27V) is broader than HVLED815PFTR and TPS92210DR but remains below the LNK403LG specification. The 8-SOIC surface-mount package and 1A output current specification provide design flexibility for moderate-power applications. MSL rating of 2 requires standard moisture control during storage and handling.

Compliance and Certification: All substitute parts maintain RoHS3 compliance and EAR99 export classification consistent with the LNK403LG. All parts are classified as REACH Unaffected. Product status is Active for all alternatives, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can HVLED815PFTR directly replace LNK403LG in existing designs?

A: Direct replacement is not possible. HVLED815PFTR operates at maximum 23V supply voltage compared to LNK403LG's 725V maximum. Applications requiring universal AC input (90V to 264V) cannot use HVLED815PFTR without additional input conditioning circuitry. Additionally, the 16-SOIC surface-mount package differs from the through-hole eSIP-7F package, requiring PCB redesign.

Q: What is the primary difference between Triac and PWM dimming in these LED driver ICs?

A: Triac dimming interfaces with phase-cut dimmers commonly used in residential and commercial lighting installations, maintaining compatibility with existing dimmer infrastructure. PWM (pulse-width modulation) dimming controls LED brightness through high-frequency switching, typically used in dedicated LED dimming systems. HVLED815PFTR uses PWM dimming, making it incompatible with standard Triac dimmers unless external conversion circuitry is added.

Q: Why does TPS92074DDCR use buck-boost topology instead of flyback?

A: Buck-boost topology provides step-down and step-up voltage conversion in a single stage, suitable for applications where input voltage may be either above or below the desired output voltage. Flyback topology, used in LNK403LG and most other substitutes, provides galvanic isolation and is optimized for offline AC-DC conversion. The architectural difference reflects different application requirements; TPS92074DDCR is not a direct functional equivalent.

Q: What does MSL (Moisture Sensitivity Level) rating mean for component procurement?

A: MSL rating indicates the maximum time a component can be stored in ambient conditions (typically 30°C, 85% relative humidity) before moisture absorption requires baking. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 3 (168 Hours) requires baking after 168 hours of ambient exposure. LNK403LG and TPS92210DR have MSL 1, while HVLED815PFTR requires more stringent moisture control with MSL 3.

Q: Can MP4032-1GS be used in high-voltage universal AC input applications?

A: No. MP4032-1GS maximum supply voltage is 27V, insufficient for universal AC input applications (90V to 264V). The part is designed for low-voltage DC input or pre-regulated supply applications. LNK403LG's 725V maximum rating is specifically engineered for direct connection to rectified AC mains voltage.

Q: What are the implications of internal switch presence or absence?

A: LNK403LG, HVLED815PFTR, and MP4032-1GS include integrated power switches, reducing external component requirements and simplifying circuit design. TPS92210DR and TPS92074DDCR lack internal switches, requiring external MOSFETs or other switching devices. This increases component count, PCB area, and design complexity but may offer flexibility in applications requiring custom switching characteristics.

Q: How do operating temperature ranges affect component selection?

A: LNK403LG and HVLED815PFTR support junction temperatures to 150°C, suitable for high-ambient or thermally constrained environments. TPS92210DR, TPS92074DDCR, and MP4032-1GS are rated to 125°C maximum. For applications in enclosed fixtures or high-temperature environments, the 150°C rating of LNK403LG provides additional thermal margin.

Q: Are all substitute parts suitable for lighting applications?

A: LNK403LG, TPS92210DR, and MP4032-1GS explicitly list Lighting in their applications field. HVLED815PFTR and TPS92074DDCR do not specify applications in the provided data. While these parts may function in lighting circuits, their suitability must be verified through detailed datasheet review and application-specific testing.