RT8468GS LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8468GS is an AC DC offline switcher LED driver IC manufactured by Richtek USA Inc., designed for step-down (buck) topology applications with 1A output current capability and analog dimming control. The device operates across a 16V to 31V supply voltage range with a 47kHz switching frequency and is housed in a 7-SOP package.

The RT8468GS is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring compatible functionality.

Key Parameters

Parameter	RT8468GS Value
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck)
Internal Switch(s)	Yes
Number of Outputs	1
Voltage - Supply (Min)	16V
Voltage - Supply (Max)	31V
Current - Output / Channel	1A
Frequency	47kHz
Dimming	Analog
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width), 7 Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RT8468GS are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Type: AC DC Offline Switcher
Topology: Step-Down (Buck)
Number of Outputs: 1
Dimming Control: Analog or Triac
Operating Temperature Range: -40°C to 125°C
Surface Mount Mounting Type
RoHS3 Compliance

Secondary Compatibility Factors:

Supply voltage range overlap or compatibility with 16V–31V input
Output current capability (1A or higher)
Switching frequency in the range of 20kHz–1MHz
Package compatibility (7-SOP, 7-SOIC, 10-VSSOP, 14-SOIC, or 16-MSOP)

Substitute parts are grouped into two categories: direct topology matches (step-down buck with analog dimming) and functional equivalents (step-down buck with triac dimming or alternative topologies such as flyback). Parts with triac dimming represent functional alternatives suitable for applications where triac-based dimming control is acceptable.

Parameter Comparison

Parameter	RT8468GS	FLS0116MX	HV9922N8-G	LM3444MMX/NOPB	LM3445MM/NOPB	LM3445MX/NOPB	LM3497M/NOPB	LT3799IMSE-1#PBF
Manufacturer	Richtek USA Inc.	Fairchild Semiconductor	Microchip Technology	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc.
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Flyback
Internal Switch(s)	Yes	Yes	Yes	No	No	No	No	No
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	16V	—	20V	8V	8V	8V	8V	—
Voltage - Supply (Max)	31V	20V	400V	13V	12V	12V	12V	—
Current - Output / Channel	1A	—	50mA	—	—	—	—	—
Frequency	47kHz	20kHz ~ 250kHz	—	—	30kHz ~ 1MHz	30kHz ~ 1MHz	—	25kHz ~ 300kHz
Dimming	Analog	Analog	Triac	Analog	Triac	Triac	Triac	Triac
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width), 7 Leads	8-SOIC (0.154", 3.90mm Width), 7 Leads	TO-243AA	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.295", 7.50mm Width)	16-TFSOP (0.118", 3.00mm Width) Exposed Pad
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Analog Dimming Substitute (Closest Match):

FLS0116MX (Fairchild Semiconductor) is the most direct substitute for the RT8468GS. Both devices employ step-down buck topology with integrated internal switches, single output, analog dimming control, and identical 8-SOIC package footprint. Both operate across the -40°C to 125°C temperature range. FLS0116MX is currently in active production status with 2,140 units in stock, providing immediate supply availability. The switching frequency range of 20kHz–250kHz encompasses the RT8468GS 47kHz specification. This part requires no PCB layout modifications and maintains full functional compatibility.

Alternative Analog Dimming Substitute (Package Variation):

LM3444MMX/NOPB (National Semiconductor) provides analog dimming control with step-down buck topology and no internal switch. The device operates within the -40°C to 125°C temperature range and is actively produced with 4,601 units in stock. The 10-VSSOP package differs from the RT8468GS 7-SOP, requiring PCB layout redesign. Supply voltage range (8V–13V) is narrower than the RT8468GS (16V–31V), limiting applicability to lower voltage input designs.

Triac Dimming Alternatives (Functional Equivalents):

LM3445MM/NOPB and LM3445MX/NOPB (Texas Instruments) are step-down buck LED drivers with triac dimming control, no internal switch, and active production status. Both operate across -40°C to 125°C with switching frequencies of 30kHz–1MHz. LM3445MM/NOPB uses 10-VSSOP packaging (21,100 units in stock), while LM3445MX/NOPB uses 14-SOIC packaging (5,100 units in stock). Supply voltage range (8V–12V) is narrower than the RT8468GS. Triac dimming represents a functional alternative suitable for applications where triac-based dimming control is acceptable.

LM3497M/NOPB (Texas Instruments) is a triac dimming step-down buck driver in 14-SOIC packaging with active production status (841 units in stock) and -40°C to 125°C operating temperature. Supply voltage range (8V–12V) is narrower than the RT8468GS.

HV9922N8-G (Microchip Technology) is an AC DC offline switcher with step-down buck topology, triac dimming, and SOT-89-3 package. It supports a wide supply voltage range (20V–400V) that overlaps with the RT8468GS upper range. Output current is limited to 50mA, significantly lower than the RT8468GS 1A specification. Operating temperature range is -40°C to 85°C, narrower than the RT8468GS. This device is suitable only for low-current applications. 25,100 units are in stock.

Alternative Topology (Flyback):

LT3799IMSE-1#PBF (Analog Devices Inc.) employs flyback topology rather than step-down buck, with triac dimming control and no internal switch. The 16-MSOP-EP package differs significantly from the RT8468GS 7-SOP, requiring complete PCB redesign. Switching frequency range (25kHz–300kHz) overlaps with the RT8468GS specification. This device is actively produced (1,104 units in stock) with ROHS3 compliance and -40°C to 125°C operating temperature. Flyback topology is suitable for isolated output applications where step-down buck topology is not required.

Compliance and Availability Summary:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the RT8468GS. All substitute parts except HV9922N8-G maintain the full -40°C to 125°C operating temperature range. FLS0116MX offers the highest compatibility with identical package and dimming control method. All alternatives are in active production, ensuring long-term supply availability compared to the obsolete RT8468GS.

Frequently Asked Questions (FAQ)

Q: Can FLS0116MX be used as a direct replacement for RT8468GS without PCB modifications?

A: Yes. FLS0116MX shares identical 8-SOIC package footprint, analog dimming control, step-down buck topology with internal switch, single output configuration, and -40°C to 125°C operating temperature range. Pin-to-pin compatibility and functional equivalence eliminate the need for PCB layout changes. Switching frequency range (20kHz–250kHz) encompasses the RT8468GS 47kHz specification.

Q: What is the key difference between analog dimming and triac dimming substitutes?

A: Analog dimming (RT8468GS, FLS0116MX, LM3444MMX/NOPB) uses a voltage or current control signal to modulate LED brightness. Triac dimming (LM3445MM/NOPB, LM3445MX/NOPB, LM3497M/NOPB, HV9922N8-G, LT3799IMSE-1#PBF) uses phase-cut dimming control compatible with standard AC wall dimmer switches. Selection depends on the dimming interface required by the end application.

Q: Why do some substitutes have narrower supply voltage ranges than the RT8468GS?

A: LM3444MMX/NOPB, LM3445MM/NOPB, LM3445MX/NOPB, and LM3497M/NOPB are designed for lower voltage input applications (8V–13V or 8V–12V) and are not suitable for designs requiring the RT8468GS 16V–31V input range. These parts are applicable only to systems operating within their specified voltage limits.

Q: Is HV9922N8-G suitable as a substitute for high-current LED driver applications?

A: No. HV9922N8-G is limited to 50mA output current, significantly lower than the RT8468GS 1A specification. This device is suitable only for low-current LED applications such as indicator lights or small LED arrays. High-current applications require FLS0116MX or equivalent 1A-rated devices.

Q: What are the package considerations when selecting a substitute?

A: FLS0116MX uses the same 8-SOIC package as the RT8468GS and requires no PCB modifications. LM3444MMX/NOPB uses 10-VSSOP, LM3445MM/NOPB uses 10-VSSOP, LM3445MX/NOPB uses 14-SOIC, LM3497M/NOPB uses 14-SOIC (wider pitch), HV9922N8-G uses SOT-89-3, and LT3799IMSE-1#PBF uses 16-MSOP-EP. Package changes require PCB layout redesign and footprint verification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (FLS0116MX, HV9922N8-G, LM3444MMX/NOPB, LM3445MM/NOPB, LM3445MX/NOPB, LM3497M/NOPB, LT3799IMSE-1#PBF) are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the RT8468GS.

Q: Which substitute offers the best supply chain availability?

A: HV9922N8-G has the highest inventory (25,100 units in stock), followed by LM3445MM/NOPB (21,100 units). FLS0116MX has 2,140 units in stock, providing adequate availability for the most direct functional replacement. All substitute parts are in active production status, ensuring long-term availability compared to the obsolete RT8468GS.

Q: Can LT3799IMSE-1#PBF be used in place of RT8468GS?

A: LT3799IMSE-1#PBF employs flyback topology rather than step-down buck, uses triac dimming instead of analog dimming, and requires a different 16-MSOP-EP package. Complete PCB redesign is necessary. This device is suitable only for applications where flyback topology and triac dimming control are acceptable alternatives to the RT8468GS step-down buck with analog dimming.

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