LNK457VG Equivalent & Substitute Parts

Part Overview

The LNK457VG is an LED driver IC manufactured by Power Integrations, designed for AC DC offline switching applications with integrated triac dimming capability. This component operates as a 1-output switcher with 1A output current capacity in a 12-SDIP through-hole package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support, legacy system maintenance, and production continuity.

Substiute Parts

LNK457VG

Power IntegrationsIn Stock: 2531LNK457VG Datasheet

Current PartRFQ

HVLED805TR

STMicroelectronicsIn Stock: 27811HVLED805TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK457VG is determined by the following critical parameters that must align across alternative components:

Primary Substitution Criteria:

• Product Category: Power Management (PMIC) - AC DC Offline Switcher topology
• Output Configuration: Single output (1 output channel)
• Operating Temperature Range: -40°C ~ 150°C (TJ) minimum
• Regulatory Compliance: RoHS compliance status
• Functional Application: LED driver with dimming capability

Secondary Compatibility Factors:

• Supply voltage operating range (LNK457VG: max 50V)
• Output current capacity (LNK457VG: 1A)
• Switching frequency (LNK457VG: 122kHz)
• Dimming control method (LNK457VG: Triac-based)
• Package form factor and mounting technology

The HVLED805TR from STMicroelectronics qualifies as a functional substitute based on shared category, single-output architecture, matching temperature range, and RoHS3 compliance. However, differences in topology (Flyback vs. unspecified), dimming method (PWM vs. Triac), supply voltage range (11.5V-23V vs. 50V max), and package type (16-SOIC surface mount vs. 12-SDIP through-hole) require engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LNK457VG is classified as obsolete. The HVLED805TR is active production status, ensuring ongoing availability and manufacturing support. Selection of an active-status component mitigates supply chain risk and supports long-term product lifecycle management.

Compliance and Certification: Both components maintain RoHS compliance (LNK457VG: RoHS Compliant; HVLED805TR: ROHS3 Compliant) and REACH unaffected status. Both are classified under ECCN EAR99 and HTSUS 8542.39.0001, indicating equivalent regulatory treatment for export and trade purposes.

Thermal Performance: Both components operate across the identical temperature range of -40°C to 150°C (junction temperature), supporting equivalent thermal design requirements.

Packaging and Assembly Impact: The LNK457VG uses through-hole mounting (12-SDIP), while HVLED805TR uses surface-mount technology (16-SOIC). This difference requires PCB redesign and assembly process modification. Through-hole components are suitable for manual assembly and rework; surface-mount components require automated assembly equipment.

Moisture Handling: The LNK457VG has MSL 1 (unlimited moisture sensitivity), while HVLED805TR has MSL 3 (168-hour limit). This affects storage, handling, and bake-out procedures during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can HVLED805TR directly replace LNK457VG without circuit modification?

A: No. While both are AC DC offline switcher LED drivers with single outputs and matching temperature ranges, critical differences exist: HVLED805TR uses PWM dimming versus LNK457VG's triac dimming, operates at lower maximum supply voltage (23V vs. 50V), and requires surface-mount assembly versus through-hole. Circuit redesign is necessary.

Q: What is the primary reason to substitute LNK457VG?

A: The LNK457VG is obsolete. HVLED805TR is active production status, ensuring component availability and manufacturing continuity for new designs or legacy system updates.

Q: Are there package compatibility issues between these parts?

A: Yes. LNK457VG is 12-SDIP through-hole; HVLED805TR is 16-SOIC surface-mount. PCB layout, footprint, and assembly process must be redesigned. Through-hole and surface-mount technologies are not interchangeable without board-level modifications.

Q: Do both components meet the same regulatory requirements?

A: Both are RoHS compliant and REACH unaffected. Both carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, supporting equivalent regulatory treatment.

Q: What is the impact of different dimming methods?

A: LNK457VG uses triac dimming (phase-cut control); HVLED805TR uses PWM dimming (pulse-width modulation). These require different control circuits and dimmer compatibility. Triac dimmers are common in legacy AC lighting; PWM dimming is typical in modern LED driver designs.

Q: How does the supply voltage difference affect substitution?

A: LNK457VG supports up to 50V supply; HVLED805TR supports up to 23V. If the application requires operation above 23V, HVLED805TR cannot be used. Verify actual supply voltage requirements before substitution.

Q: What is the moisture sensitivity impact?

A: LNK457VG (MSL 1) has unlimited shelf life under standard conditions. HVLED805TR (MSL 3) requires bake-out if exposed to moisture for more than 168 hours. This affects component storage, handling procedures, and manufacturing logistics.

Q: Is HVLED805TR the only substitute listed?

A: According to the provided data, HVLED805TR is the primary substitute identified for LNK457VG. The HVLED805TR itself lists additional substitutes (ALTAIR05T-800TR, MP4027GJ-Z, HVLED815PFTR, RT8415GSP, LT3799IMSE-1#PBF), which may be evaluated as secondary alternatives depending on application requirements.