LNK458KG-TL Equivalent & Substitute Parts

Part Overview

The LNK458KG-TL is an AC DC offline switcher LED driver IC manufactured by Power Integrations, part of the LinkSwitch®-PL series. This device integrates a 1A output channel with triac dimming capability in a 12-ESOP package, designed for LED lighting applications requiring offline power conversion. The product status is listed as Not For New Designs, making identification of active equivalent and substitute parts essential for ongoing production support and new design alternatives.

Substiute Parts

LNK458KG-TL

Power IntegrationsIn Stock: 16882LNK458KG-TL Datasheet

Current PartRFQ

AP1685MTR-G1

Diodes IncorporatedIn Stock: 40399AP1685MTR-G1 Datasheet

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HV9923N8-G

Microchip TechnologyIn Stock: 2693HV9923N8-G Datasheet

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LM3450MTX/NOPB

Texas InstrumentsIn Stock: 5425LM3450MTX/NOPB Datasheet

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MP4653GY-Z

Monolithic Power Systems Inc.In Stock: 63896MP4653GY-Z Datasheet

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NCL30030B3DR2G

onsemiIn Stock: 20139NCL30030B3DR2G Datasheet

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RT8497AGS

Richtek USA Inc.In Stock: 25338RT8497AGS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK458KG-TL is determined by the following critical parameters:

Primary Substitution Criteria:

• Type: AC DC Offline Switcher (all substitutes must match)
• Number of Outputs: 1 (all substitutes must match)
• Dimming Capability: Triac dimming is the primary functional requirement
• Voltage Supply Range: Maximum supply voltage of 50V establishes upper compatibility boundary
• Current Output: 1A output current defines the power delivery capability
• Operating Temperature Range: -40°C to 150°C (TJ) sets thermal performance expectations
• Mounting Type: Surface Mount (all substitutes must match)
• RoHS Compliance: Required for regulatory alignment

Substitution Logic: Substitute parts are grouped based on topology (Step-Down Buck, Flyback, Half-Bridge), dimming method (Triac, Analog, PWM), and current handling capacity. Parts with triac dimming capability are primary candidates. Parts with alternative dimming methods (Analog, PWM) are secondary candidates when triac dimming is not available. Current output ratings equal to or exceeding 1A are acceptable. Voltage supply ranges must encompass the operating requirements of the application.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute Candidates:

HV9923N8-G (Microchip Technology) is the closest functional equivalent, offering triac dimming capability as the LNK458KG-TL. This part is Active status and ROHS3 compliant. However, the output current is significantly lower at 30mA versus 1A, limiting its application to lower-power LED driver circuits. The voltage supply range extends to 400V maximum, providing broader input voltage compatibility. Operating temperature range is -40°C to 85°C (TA), which is lower than the LNK458KG-TL specification.

RT8497AGS (Richtek USA Inc.) provides comparable 1.4A output current and Step-Down topology. This part is listed as Obsolete, making it unsuitable for new production. The voltage supply range is 10V to 30V, which is narrower than the LNK458KG-TL. Operating temperature is -40°C to 85°C (TA).

Secondary Substitute Candidates:

MP4653GY-Z (Monolithic Power Systems Inc.) offers Active status and ROHS3 compliance with Analog and PWM dimming alternatives to triac dimming. The Half-Bridge topology and 20-SOIC package differ from the original design. Voltage supply range is 9V to 30V. Operating temperature is -40°C to 125°C (TJ), exceeding the LNK458KG-TL minimum specification.

NCL30030B3DR2G (onsemi) provides Flyback topology with Active status and ROHS3 compliance. Voltage supply range is 9V to 30V. Operating temperature is -40°C to 125°C (TJ). This part lacks specified dimming capability and current output rating.

AP1685MTR-G1 (Diodes Incorporated) offers 2.5A output current with Step-Down topology and Active status. Voltage supply range is 8V to 25V. Operating temperature is -40°C to 105°C (TA). This part lacks triac dimming capability.

LM3450MTX/NOPB (Texas Instruments) provides Flyback and Step-Up topology with Analog dimming and Active status. Voltage supply range is 8.5V to 20V with 11.5V output voltage. Operating temperature is -40°C to 125°C (TJ). This part is suitable for boost converter applications requiring analog dimming control.

Compliance and Regulatory Alignment:

All substitute candidates except RT8497AGS maintain Active product status. All candidates are ROHS3 compliant, meeting current regulatory requirements. All candidates are REACH Unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can HV9923N8-G directly replace LNK458KG-TL in existing designs?

A: HV9923N8-G shares triac dimming capability and AC DC offline switcher topology. However, the 30mA output current is significantly lower than the 1A specification of LNK458KG-TL. Direct replacement is only feasible in applications requiring less than 30mA output current. Circuit redesign may be necessary for higher-power applications.

Q: What is the primary difference between triac dimming and PWM dimming?

A: Triac dimming controls LED brightness by modulating the AC line voltage phase angle, suitable for direct AC line dimming applications. PWM (Pulse Width Modulation) dimming controls brightness by switching the output on and off at high frequency. MP4653GY-Z offers PWM dimming as an alternative to triac dimming, requiring different circuit implementation.

Q: Why is RT8497AGS listed as Obsolete?

A: RT8497AGS is marked as Obsolete status, indicating the manufacturer has discontinued production. While inventory may be available from distributors, this part is not recommended for new designs or long-term production commitments. Active alternatives such as HV9923N8-G or MP4653GY-Z are preferred.

Q: How do package differences affect substitution?

A: The LNK458KG-TL uses 12-BESOP packaging (0.350" width). Substitute parts use different packages: AP1685MTR-G1 (8-SOIC), HV9923N8-G (TO-243AA), LM3450MTX/NOPB (16-TSSOP), MP4653GY-Z (20-SOIC), NCL30030B3DR2G (16-SOIC), and RT8497AGS (8-SOIC). PCB layout and footprint redesign is required when changing packages. Pin count and pinout configuration must be verified against schematic requirements.

Q: What operating temperature considerations apply to substitution?

A: The LNK458KG-TL operates from -40°C to 150°C (TJ). Most substitute parts operate to -40°C to 125°C (TJ) or -40°C to 85°C (TA). Applications requiring operation above 125°C junction temperature may not be compatible with substitute parts. Thermal management and derating analysis is necessary when operating near maximum temperature limits.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements. The LNK458KG-TL is RoHS Compliant. Compliance status is consistent across all candidates.

Q: What voltage supply range compatibility exists between LNK458KG-TL and substitutes?

A: The LNK458KG-TL maximum supply voltage is 50V. Most substitutes have lower maximum ratings: AP1685MTR-G1 (25V), HV9923N8-G (400V), LM3450MTX/NOPB (20V), MP4653GY-Z (30V), NCL30030B3DR2G (30V), RT8497AGS (30V). HV9923N8-G uniquely supports 400V maximum, suitable for high-voltage applications. Applications requiring 50V supply voltage may require circuit modification with lower-rated substitutes.

Q: Which substitute is best for new LED driver designs?

A: MP4653GY-Z (Monolithic Power Systems Inc.) is recommended for new designs due to Active product status, ROHS3 compliance, extended operating temperature range (-40°C to 125°C TJ), and dual dimming capability (Analog and PWM). HV9923N8-G is recommended when triac dimming is specifically required. Both parts are actively manufactured and supported by their respective suppliers.