RT8494GS LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The RT8494GS is an active LED driver controller IC manufactured by Richtek USA Inc., designed for power management applications requiring step-down (buck) and step-up (boost) topologies. This 14-SOP surface mount device operates across a 4.5V to 36V supply range and supports both analog and PWM dimming for backlight and lighting applications. With automotive-grade qualification (AEC-Q100) and ROHS3 compliance, the RT8494GS is suitable for demanding industrial and automotive environments. Equivalent and substitute parts are identified based on matching functional topology, dimming capability, supply voltage range, frequency operation, and automotive qualification status.

Key Parameters

Parameter	RT8494GS Value
Manufacturer	Richtek USA Inc.
Type	DC DC Controller
Topology	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	36V
Voltage - Output	90V
Frequency	100kHz ~ 1MHz
Dimming	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Grade	Automotive
Qualification	AEC-Q100
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the RT8494GS are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

DC DC Controller type with step-down (buck) and/or step-up (boost) topology
Single output configuration
Supply voltage range compatibility (minimum 4.5V or lower, maximum 36V or higher)
Dimming capability (analog, PWM, or both)
Frequency operation range (100kHz to 1MHz preferred)
Automotive grade and AEC-Q100 qualification (where applicable)
Surface mount packaging with ROHS3 compliance

Identified Substitute Parts:

LT3795EFE#TRPBF - Analog Devices Inc. (28-TSSOP-EP)
BD8381AEFV-ME2 - Rohm Semiconductor (28-HTSSOP-B)
LT3791MPFE#PBF - Analog Devices Inc. (38-TSSOP-EP)
TPS92691QPWPRQ1 - Texas Instruments (16-HTSSOP)
LT8391EFE#PBF - Analog Devices Inc. (28-TSSOP-EP)

Parameter Comparison

Parameter	RT8494GS	LT3795EFE#TRPBF	BD8381AEFV-ME2	LT3791MPFE#PBF	TPS92691QPWPRQ1	LT8391EFE#PBF
Manufacturer	Richtek USA Inc.	Analog Devices Inc.	Rohm Semiconductor	Analog Devices Inc.	Texas Instruments	Analog Devices Inc.
Type	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller
Topology	Buck, Boost	Not Specified	Buck, Boost	Buck, Boost	Flyback, SEPIC, Buck, Boost	Buck, Boost
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	4.5V	4.5V	5V	4.7V	4.5V	4V
Voltage - Supply (Max)	36V	110V	30V	60V	65V	60V
Voltage - Output	90V	Not Specified	Not Specified	0V ~ 60V	65V	60V
Frequency	100kHz ~ 1MHz	100kHz ~ 1MHz	300kHz	200 ~ 700kHz	80kHz ~ 700kHz	150kHz ~ 650kHz
Dimming	Analog, PWM	Analog, PWM	PWM	Analog, PWM	Analog, PWM	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)	-55°C ~ 150°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TJ)
Grade	Automotive	Not Specified	Automotive	Not Specified	Automotive	Automotive
Qualification	AEC-Q100	Not Specified	Not Specified	Not Specified	AEC-Q100	Not Specified
Package / Case	14-SOIC (0.154", 3.90mm)	28-TSSOP (0.173", 4.40mm)	28-VSSOP (0.173", 4.40mm)	38-TFSOP (0.173", 4.40mm)	16-PowerTSSOP (0.173", 4.40mm)	28-TSSOP (0.173", 4.40mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

LT3795EFE#TRPBF - Recommended for applications requiring extended supply voltage range (up to 110V) with matching frequency operation (100kHz ~ 1MHz) and dual dimming capability (analog and PWM). Offers superior moisture sensitivity (MSL 1) compared to RT8494GS. Suitable for high-voltage LED driver applications.

BD8381AEFV-ME2 - Suitable for automotive-grade applications with PWM dimming. Supply voltage maximum (30V) is lower than RT8494GS, limiting use to lower voltage systems. Automotive qualification status not specified. Tape & Reel packaging available for production volumes.

LT3791MPFE#PBF - Recommended for lighting applications requiring extended temperature range (-55°C to 150°C) and dual dimming capability. Output voltage range (0V ~ 60V) provides flexibility. MSL 1 rating indicates superior moisture resistance. Part of Analog Devices True Color PWM™ series.

TPS92691QPWPRQ1 - Recommended for automotive applications with AEC-Q100 qualification matching RT8494GS. Supports multiple topologies (Flyback, SEPIC, Buck, Boost) with extended supply voltage (up to 65V). Highest inventory availability (25,300 pcs) among substitutes. Suitable for diverse lighting topologies.

LT8391EFE#PBF - Recommended for automotive-grade lighting applications with matching dimming capability (analog and PWM). Supply voltage range (4V ~ 60V) and frequency operation (150kHz ~ 650kHz) provide good compatibility. MSL 1 rating offers superior moisture protection.

Frequently Asked Questions (FAQ)

Q: Can LT3795EFE#TRPBF replace RT8494GS in all applications? A: LT3795EFE#TRPBF is functionally compatible for applications within the RT8494GS supply voltage range (4.5V ~ 36V). The LT3795EFE#TRPBF supports higher maximum supply voltage (110V), making it suitable for extended-range applications. Frequency operation (100kHz ~ 1MHz) and dimming capability (analog, PWM) match the RT8494GS. Package differences (28-TSSOP vs. 14-SOIC) require PCB layout redesign.

Q: What are the package compatibility considerations? A: RT8494GS uses 14-SOIC (0.154", 3.90mm width) packaging. All identified substitutes use larger TSSOP or HTSSOP packages (28-pin or 38-pin, 0.173" width). PCB redesign is required for any substitution. Pin count and pinout differences must be verified against device datasheets before implementation.

Q: Which substitute offers the best automotive qualification? A: TPS92691QPWPRQ1 and RT8494GS both carry AEC-Q100 qualification. LT8391EFE#PBF is automotive-grade but qualification status is not specified. BD8381AEFV-ME2 is automotive-grade without specified AEC-Q100 qualification. For critical automotive applications, TPS92691QPWPRQ1 provides matching AEC-Q100 certification.

Q: Are there supply voltage limitations when substituting? A: BD8381AEFV-ME2 has maximum supply voltage of 30V, which is lower than RT8494GS (36V). This part is unsuitable for applications requiring the full 36V supply range. All other substitutes support 36V or higher maximum supply voltage, providing full compatibility with RT8494GS voltage specifications.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences? A: RT8494GS and BD8381AEFV-ME2 have MSL 3 (168 hours), requiring controlled storage and handling. LT3795EFE#TRPBF, LT3791MPFE#PBF, and LT8391EFE#PBF have MSL 1 (unlimited), offering superior moisture resistance and simplified storage requirements. TPS92691QPWPRQ1 has MSL 3, matching RT8494GS handling requirements.

Q: Do all substitutes support both analog and PWM dimming? A: LT3795EFE#TRPBF, LT3791MPFE#PBF, TPS92691QPWPRQ1, and LT8391EFE#PBF support both analog and PWM dimming, matching RT8494GS capability. BD8381AEFV-ME2 supports PWM dimming only, limiting applications requiring analog dimming control.

Q: What frequency operation differences exist among substitutes? A: RT8494GS operates at 100kHz ~ 1MHz. BD8381AEFV-ME2 operates at fixed 300kHz. LT3791MPFE#PBF (200 ~ 700kHz), TPS92691QPWPRQ1 (80kHz ~ 700kHz), and LT8391EFE#PBF (150kHz ~ 650kHz) offer variable frequency ranges. LT3795EFE#TRPBF matches the full 100kHz ~ 1MHz range of RT8494GS.

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