RT8497GS LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8497GS is an AC DC offline switcher LED driver IC manufactured by Richtek USA Inc., designed for lighting applications with a 1.4A output capability and step-down (buck) topology. The device operates across a 10V to 30V supply range and is housed in an 8-SOP package. The RT8497GS is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	RT8497GS
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	10V
Voltage - Supply (Max)	30V
Current - Output / Channel	1.4A
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RT8497GS is determined by alignment across the following critical parameters: AC DC offline switcher topology, step-down (buck) converter architecture, single output configuration, supply voltage range compatibility (10V–30V minimum), output current capability (1.4A or greater), 8-SOP or compatible package footprint, and operating temperature range (-40°C to 85°C or wider). Parts are grouped into three categories based on substitution relationship strength:

Direct Richtek Family Equivalents: Parts sharing identical base product number (RT8497) with matching electrical specifications and package compatibility.

Cross-Manufacturer Parametric Equivalents: Parts from alternative manufacturers meeting core electrical parameters and package requirements while maintaining functional compatibility.

Topology-Compatible Alternatives: Parts with different topologies or supply voltage ranges that may require circuit redesign but offer functional LED driver capability.

Parameter Comparison

Part Number	Manufacturer	Type	Topology	Supply Min (V)	Supply Max (V)	Output Current (A)	Package	Temp Range (°C)	Status
RT8497GS	Richtek USA Inc.	AC DC Offline Switcher	Step-Down (Buck)	10	30	1.4	8-SOIC	-40 ~ 85	Obsolete
RT8497BGS	Richtek USA Inc.	AC DC Offline Switcher	Step-Down (Buck)	10	30	1.4	8-SOIC	-40 ~ 85	Obsolete
RT8497AGS	Richtek USA Inc.	AC DC Offline Switcher	Step-Down (Buck)	10	30	1.4	8-SOIC	-40 ~ 85	Obsolete
LM3497MM/NOPB	Texas Instruments	AC DC Offline Switcher	Step-Down (Buck)	8	12	—	10-VSSOP	-40 ~ 125	Active
LNK417EG	Power Integrations	AC DC Offline Switcher	Flyback	36	725	1.77	eSIP-7C	-40 ~ 150	Active
MP4050AGJ-Z	Monolithic Power Systems Inc.	AC DC Offline Switcher	Step-Down (Buck)	4.1	5	—	TSOT-23-5	-40 ~ 125	Active
AL1692-20CS7-13	Diodes Incorporated	AC DC Offline Switcher	Flyback, Step-Down (Buck), Step-Up (Boost)	8.5	20	2	7-SO	-40 ~ 105	Active
LYT1604D-TL	Power Integrations	AC DC Offline Switcher	Step-Down (Buck)	90VAC	308VAC	—	8-SO	-40 ~ 125	Active
MXHV9910BE	IXYS Integrated Circuits Division	AC DC Offline Switcher	Step-Down (Buck)	8	450	—	8-SOIC-EP	-40 ~ 85	Active

Engineering Selection Recommendations

Direct Richtek Equivalents (RT8497BGS, RT8497AGS): These parts are the primary substitutes for the RT8497GS. All three variants share identical electrical specifications, package footprint, and operating parameters. RT8497AGS offers the highest inventory availability (25,300 units) and maintains full compatibility with existing RT8497GS designs. Both RT8497BGS and RT8497AGS are classified as obsolete, consistent with the main part status.

Texas Instruments LM3497MM/NOPB: This part operates as an AC DC offline switcher with step-down topology but has a narrower supply voltage range (8V–12V versus 10V–30V). The device is active and carries extended operating temperature range (-40°C to 125°C). Package differs (10-VSSOP versus 8-SOIC), requiring PCB layout modification. Suitable for applications where supply voltage remains within 8V–12V bounds.

Power Integrations LNK417EG: This LinkSwitch-PH series device uses flyback topology with significantly higher supply voltage range (36V–725V) and higher output current (1.77A). The device is active with extended temperature rating (-40°C to 150°C) but requires substantial circuit redesign due to topology change and through-hole package (eSIP-7C). Appropriate for high-voltage offline applications.

Monolithic Power Systems MP4050AGJ-Z: This part operates at significantly lower supply voltages (4.1V–5V) with step-down topology. The TSOT-23-5 package is substantially smaller than 8-SOIC, requiring complete PCB redesign. The device is active with automotive-grade qualification. Not suitable for 10V–30V supply applications without external voltage regulation.

Diodes Incorporated AL1692-20CS7-13: This device supports multiple topologies (flyback, step-down, step-up) with 2A output current and supply range of 8.5V–20V. The 7-SO package differs from 8-SOIC. The device is active with extended temperature range (-40°C to 105°C). Topology flexibility may require circuit evaluation.

Power Integrations LYT1604D-TL: This LYTSwitch-1 series device operates directly from AC mains (90VAC–308VAC) with step-down topology and 20kHz switching frequency. The 8-SO package is compatible with 8-SOIC footprint. The device is active with extended temperature range. Suitable for direct AC mains applications without intermediate DC conversion.

IXYS MXHV9910BE: This part supports wide supply voltage range (8V–450V) with step-down topology and PWM dimming capability. The 8-SOIC-EP package with exposed pad is footprint-compatible with RT8497GS. The device is active with matching temperature range (-40°C to 85°C). Suitable for applications requiring extended voltage range.

Frequently Asked Questions (FAQ)

Q: Can RT8497BGS and RT8497AGS be used interchangeably with RT8497GS?

A: Yes. Both parts are Richtek RT8497 family variants with identical electrical specifications, package footprint (8-SOIC), supply voltage range (10V–30V), output current (1.4A), and operating temperature range (-40°C to 85°C). No circuit modifications are required.

Q: What is the primary limitation when substituting with LM3497MM/NOPB?

A: The LM3497MM/NOPB has a narrower supply voltage range (8V–12V maximum) compared to the RT8497GS (10V–30V maximum). This part is suitable only for applications where the supply voltage remains below 12V. Additionally, the 10-VSSOP package differs from the 8-SOIC footprint, requiring PCB layout changes.

Q: Why does LNK417EG require circuit redesign?

A: The LNK417EG uses flyback topology instead of step-down (buck) topology. Flyback converters require different transformer design, feedback network, and output filtering compared to buck converters. Additionally, the supply voltage range (36V–725V) is substantially higher than the RT8497GS (10V–30V), and the through-hole eSIP-7C package differs from surface-mount 8-SOIC.

Q: Is MP4050AGJ-Z suitable as a direct replacement?

A: No. The MP4050AGJ-Z operates at 4.1V–5V supply voltage, which is incompatible with the RT8497GS 10V–30V range. The TSOT-23-5 package is also significantly smaller than 8-SOIC, requiring complete PCB redesign. This part is not suitable for applications requiring 10V or higher supply voltage.

Q: What are the advantages of LYT1604D-TL for LED driver applications?

A: The LYT1604D-TL operates directly from AC mains (90VAC–308VAC) without requiring intermediate DC conversion, simplifying power supply design for lighting applications. The 8-SO package is compatible with 8-SOIC footprint. The device is active with extended temperature range (-40°C to 125°C). This part is suitable for direct AC mains LED driver designs.

Q: Can MXHV9910BE handle higher supply voltages than RT8497GS?

A: Yes. The MXHV9910BE supports supply voltages up to 450V compared to the RT8497GS maximum of 30V. The 8-SOIC-EP package is footprint-compatible. However, the MXHV9910BE has no internal switch (versus RT8497GS with internal switch), which may affect circuit design requirements. Verify dimming and control requirements before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: The RT8497 family variants (RT8497BGS, RT8497AGS) are ROHS3 compliant. Most active alternatives (MP4050AGJ-Z, MXHV9910BE, AL1692-20CS7-13) are ROHS3 compliant. LNK417EG and LYT1604D-TL are RoHS compliant. Verify specific compliance requirements for your application before final selection.

Q: What package considerations apply when selecting a substitute?

A: The RT8497GS uses 8-SOIC (0.154", 3.90mm width) surface-mount package. Direct Richtek equivalents (RT8497BGS, RT8497AGS) use identical packaging. LYT1604D-TL uses 8-SO, which is compatible. LM3497MM/NOPB uses 10-VSSOP, requiring PCB modification. MP4050AGJ-Z uses TSOT-23-5, substantially smaller. LNK417EG uses through-hole eSIP-7C. Package compatibility must be verified before design implementation.

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