RT8470GJ5 LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8470GJ5 is an active LED driver IC manufactured by Richtek USA Inc., designed for step-down (buck) topology DC-DC regulation with 1A output current capability. This device features analog and PWM dimming control, operates across a 7V to 30V supply range, and is packaged in TSOT-23-5 surface mount configuration. The part is ROHS3 compliant and actively produced. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, higher supply voltage tolerance, increased output current capacity, different package formats, or enhanced thermal specifications.

Key Parameters

Parameter	RT8470GJ5
Manufacturer	Richtek USA Inc.
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	7V
Voltage - Supply (Max)	30V
Current - Output / Channel	1A
Dimming	Analog, PWM
Package / Case	SOT-23-5 Thin, TSOT-23-5
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on parametric alignment with the RT8470GJ5:

Parametric Equivalent: RT8471GJ5 maintains identical functional specifications with extended maximum supply voltage (36V vs. 30V) and expanded application scope. Same manufacturer, package, and core electrical characteristics enable direct functional replacement.

Similar Functional Parts: The remaining substitutes share core LED driver functionality (step-down buck topology, 1A or greater output current, analog/PWM dimming, lighting applications) but differ in one or more of the following parameters: package format, supply voltage range, output current rating, frequency specification, or thermal grade. Selection depends on specific design constraints including PCB space availability, thermal dissipation requirements, and supply voltage specifications.

Key parameters determining substitution eligibility:

Topology: Step-Down (Buck) required
Dimming capability: Analog, PWM, or PWM minimum
Output current: 1A or greater
Supply voltage range: Must encompass application requirements
Package compatibility: Physical and thermal considerations
Compliance: ROHS3 and REACH status alignment

Parameter Comparison

Parameter	RT8470GJ5	RT8471GJ5	HV9918K7-G	IS31LT3360-SDLS4-TR	LM3402HVMRX/NOPB	LM3404MRX/NOPB	LM3406MHX/NOPB	LM3414HVMRX/NOPB	LT3474EFE-1#PBF	LT3932EUFD#PBF
Manufacturer	Richtek	Richtek	Microchip	Lumissil	National Semi.	Texas Inst.	Texas Inst.	Texas Inst.	Analog Devices	Analog Devices
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Supply Min (V)	7	7	4.5	6	6	6	6	4.5	4.6	3.6
Supply Max (V)	30	36	40	40	75	42	42	65	36	36
Output Current	1A	1A	30mA	1.2A	500mA	1A	1.5A	1A	1A	2A
Dimming	Analog, PWM	Analog, PWM	Analog, PWM	Analog, PWM	PWM	PWM	PWM	Analog, PWM	PWM	Analog, PWM
Package	TSOT-23-5	TSOT-23-5	8-DFN (3x3)	SOT-89-5	8-SO PowerPad	8-SO PowerPad	14-HTSSOP	8-SO PowerPad	16-TSSOP-EP	28-QFN (4x5)
Frequency	—	—	2MHz	1MHz	1MHz	1MHz	10kHz ~ 1MHz	500kHz	200kHz ~ 2MHz	200kHz ~ 2MHz
Operating Temp (°C)	-40 ~ 125 (TJ)	-40 ~ 125 (TJ)	-40 ~ 125 (TA)	-40 ~ 125 (TA)	-40 ~ 125 (TJ)	-40 ~ 125 (TJ)	-40 ~ 125 (TJ)	-40 ~ 125 (TJ)	-40 ~ 85 (TA)	-40 ~ 125 (TJ)
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	—	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): RT8471GJ5 is the primary equivalent, offering identical TSOT-23-5 packaging and core specifications with extended 36V maximum supply voltage rating. Both parts are ROHS3 compliant, actively produced, and manufactured by Richtek. Selection of RT8471GJ5 is appropriate when higher input voltage tolerance is required within the same form factor.

Alternative Selections Based on Design Requirements:

For applications requiring higher output current capacity, LM3406MHX/NOPB (1.5A) and LT3932EUFD#PBF (2A) provide increased current handling in larger packages. Both are ROHS3 compliant and actively produced.

For designs with extended supply voltage requirements up to 75V, LM3402HVMRX/NOPB accommodates this specification, though output current is limited to 500mA and dimming is PWM-only.

For applications requiring lower minimum supply voltage (4.6V), LT3474EFE-1#PBF operates from 4.6V minimum with 1A output current and PWM dimming in 16-TSSOP-EP package. Operating temperature maximum is 85°C.

For space-constrained designs, HV9918K7-G offers the smallest footprint (8-DFN 3x3) with extended 40V supply range, though output current is limited to 30mA.

All recommended substitutes maintain ROHS3 compliance and active product status, ensuring regulatory alignment and supply continuity.

Frequently Asked Questions (FAQ)

Q: Can RT8471GJ5 be used as a direct drop-in replacement for RT8470GJ5? A: Yes. RT8471GJ5 is a parametric equivalent with identical package (TSOT-23-5), output current (1A), dimming capability (Analog, PWM), and operating temperature range (-40°C to 125°C). The extended maximum supply voltage (36V vs. 30V) provides additional design margin without affecting compatibility in applications operating within the original 7V to 30V range.

Q: What is the primary difference between the RT8470GJ5 and similar parts like LM3414HVMRX/NOPB? A: Both devices are 1A LED driver ICs with analog and PWM dimming in step-down topology. Key differences include package format (TSOT-23-5 vs. 8-SO PowerPad), supply voltage range (7-30V vs. 4.5-65V), and frequency specification (unspecified vs. 500kHz). Package selection depends on PCB layout constraints and thermal dissipation requirements.

Q: Why does HV9918K7-G have significantly lower output current (30mA) compared to the RT8470GJ5 (1A)? A: HV9918K7-G is designed for lower-power LED applications and uses a smaller 8-DFN (3x3) package. This part is suitable only for applications with output current requirements of 30mA or less. For 1A applications, this part is not a functional substitute.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitutes except LM3402HVMRX/NOPB are explicitly ROHS3 compliant. LM3402HVMRX/NOPB compliance status is not specified in available data. Verify compliance documentation with the supplier before selection for regulated applications.

Q: What package considerations apply when selecting a substitute? A: The RT8470GJ5 uses TSOT-23-5 (5-pin thin SOT-23), the smallest package in this list. Substitutes use larger packages (8-SO PowerPad, 8-DFN, SOT-89-5, 14-HTSSOP, 16-TSSOP-EP, 28-QFN) requiring different PCB footprints and potentially increased board space. Verify PCB layout compatibility and thermal via requirements before substitution.

Q: Can LT3474EFE-1#PBF be used in applications requiring 125°C operation? A: No. LT3474EFE-1#PBF has a maximum operating temperature of 85°C (TA), which is 40°C lower than the RT8470GJ5 specification of 125°C (TJ). This part is unsuitable for high-temperature applications.

Q: Which substitute offers the highest supply voltage tolerance? A: LM3402HVMRX/NOPB supports 6V to 75V input range, the widest among all listed parts. However, output current is limited to 500mA and dimming is PWM-only. Selection depends on whether the 75V capability is required for the specific application.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message