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RT8470GSP LED Driver IC Equivalent & Substitute Parts
Part Overview
The RT8470GSP is an active LED driver IC manufactured by Richtek USA Inc., designed for step-down (buck) topology DC-DC regulation with 1.2A output capability. This component integrates analog and PWM dimming functionality for lighting applications, operating across a 7V to 30V supply range with an 8-SOP-EP surface mount package. The part is ROHS3 compliant and currently in active production with 1345 units in stock.
Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters, particularly when the main part faces supply constraints, end-of-life considerations, or when alternative packaging or thermal characteristics better suit specific application requirements.
Substiute Parts
Key Parameters
| Parameter | RT8470GSP |
|---|---|
| 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 | 1.2A |
| Dimming | Analog, PWM |
| Applications | Lighting |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitute parts for the RT8470GSP are categorized based on the following critical parameters that determine functional equivalence:
Primary Substitution Criteria:
- Topology: Step-Down (Buck) configuration
- Dimming capability: Analog and/or PWM support
- Output current: Minimum 1A capability
- Supply voltage range: Overlap with 7V-30V input specification
- Applications: Lighting-focused designs
- Temperature rating: -40°C to 125°C junction temperature
- RoHS compliance: ROHS3 Compliant status
Secondary Compatibility Factors:
- Package type: Surface mount with exposed pad preferred
- Internal switch integration: Required
- Single output configuration: Required
Parts that deviate from step-down topology (such as boost or SEPIC configurations) are listed for reference but represent functional alternatives rather than direct substitutes, as they address different voltage conversion requirements.
Parameter Comparison
| Part Number | Manufacturer | Topology | Output Current | Supply Min | Supply Max | Dimming | Package | Temp Range | RoHS |
|---|---|---|---|---|---|---|---|---|---|
| RT8470GSP | Richtek USA Inc. | Step-Down (Buck) | 1.2A | 7V | 30V | Analog, PWM | 8-SOIC Exposed Pad | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3404MA/NOPB | Texas Instruments | Step-Down (Buck) | 1A | 6V | 42V | PWM | 8-SOIC | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3414MRX/NOPB | Texas Instruments | Step-Down (Buck) | 1A | 4.5V | 42V | Analog, PWM | 8-PowerSOIC | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3402MM/NOPB | Texas Instruments | Step-Down (Buck) | 500mA | 6V | 42V | PWM | 8-VSSOP | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3404HVMAX/NOPB | Texas Instruments | Step-Down (Buck) | 1A | 6V | 75V | PWM | 8-SOIC | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3405AXMKE/NOPB | Texas Instruments | Step-Down (Buck) | 1A | 3V | 22V | PWM | SOT-23-6 | -40°C ~ 125°C (TJ) | ROHS3 |
| LM3406HVMH/NOPB | Texas Instruments | Step-Down (Buck) | 1.5A | 6V | 75V | PWM | 14-HTSSOP | -40°C ~ 125°C (TJ) | ROHS3 |
| LT3519EMS-1#PBF | Analog Devices Inc. | SEPIC, Step-Down (Buck), Step-Up (Boost) | 750mA (Switch) | 3V | 30V | Analog, PWM | 16-MSOP | -40°C ~ 125°C (TJ) | ROHS3 |
| LT3590EDC#TRMPBF | Analog Devices Inc. | Step-Down (Buck) | 80mA (Switch) | 4.5V | 55V | PWM | 6-DFN (2x2) | -40°C ~ 85°C (TJ) | ROHS3 |
| A8513KLYTR-T | Allegro MicroSystems | SEPIC, Step-Up (Boost) | 150mA | 4.5V | 40V | PWM | 10-MSOP-EP | -40°C ~ 125°C (TA) | ROHS3 |
| LM2705MFX-ADJ/NOPB | Texas Instruments | Step-Up (Boost) | 150mA | 2.2V | 7V | — | SOT-23-5 | -40°C ~ 85°C (TA) | ROHS3 |
Engineering Selection Recommendations
Direct Substitutes (Step-Down Buck Topology with Lighting Application Focus):
The LM3404MA/NOPB and LM3414MRX/NOPB represent the closest functional equivalents to the RT8470GSP. Both maintain step-down topology, support lighting applications, operate across overlapping supply voltage ranges, and carry identical temperature ratings and RoHS3 compliance. The LM3414MRX/NOPB provides the additional advantage of dual dimming capability (analog and PWM), matching the RT8470GSP specification exactly. The LM3404MA/NOPB delivers equivalent 1A output current with extended supply voltage tolerance (6V-42V) and automotive-grade qualification.
Higher Current Capability Alternative:
The LM3406HVMH/NOPB offers 1.5A output current, exceeding the RT8470GSP specification and providing design margin for lighting applications requiring higher drive capability. This part maintains step-down topology, identical temperature rating, and automotive qualification. The 14-HTSSOP package provides enhanced thermal performance compared to the 8-SOIC form factor.
Lower Current / Compact Package Options:
The LM3402MM/NOPB and LT3590EDC#TRMPBF are suitable for applications where output current requirements are reduced. The LM3402MM/NOPB maintains full temperature range and lighting application focus. The LT3590EDC#TRMPBF operates at reduced temperature range (-40°C to 85°C) and is optimized for signage applications rather than general lighting.
Multi-Topology Alternatives:
The LT3519EMS-1#PBF supports SEPIC, step-down, and step-up configurations within a single device, providing design flexibility for applications requiring voltage conversion in either direction. This part maintains analog and PWM dimming capability and operates across the full -40°C to 125°C temperature range.
Non-Equivalent Topologies (Reference Only):
The A8513KLYTR-T and LM2705MFX-ADJ/NOPB employ boost or SEPIC topologies and are not suitable as direct substitutes for step-down buck applications. These parts are listed for reference in applications where voltage step-up conversion is required.
Frequently Asked Questions (FAQ)
Q: Can the LM3404MA/NOPB directly replace the RT8470GSP in existing designs?
A: The LM3404MA/NOPB maintains compatible step-down topology, 1A output current, identical temperature rating, and 8-SOIC package form factor. The primary design consideration is that the LM3404MA/NOPB supports PWM dimming only, whereas the RT8470GSP includes both analog and PWM dimming. If the application requires analog dimming control, the LM3414MRX/NOPB is the appropriate substitute, as it provides both dimming modes.
Q: What is the significance of the supply voltage range difference between RT8470GSP (7V-30V) and LM3404MA/NOPB (6V-42V)?
A: The LM3404MA/NOPB accepts lower minimum input voltage (6V versus 7V) and higher maximum input voltage (42V versus 30V). For applications operating within the 7V-30V window, both parts are functionally equivalent. The extended range of the LM3404MA/NOPB provides additional design flexibility for systems with variable input sources.
Q: Why is the LM3406HVMH/NOPB listed as a substitute if it has higher current rating (1.5A versus 1.2A)?
A: Higher output current capability does not preclude substitution; it provides design margin and thermal headroom. The LM3406HVMH/NOPB can deliver the required 1.2A with reduced stress on the internal switch, potentially improving reliability and thermal performance. The 14-HTSSOP package offers superior thermal characteristics compared to the 8-SOIC form factor.
Q: Can boost topology parts like the A8513KLYTR-T or LM2705MFX-ADJ/NOPB replace the RT8470GSP?
A: No. The RT8470GSP is a step-down (buck) regulator, while these parts employ step-up (boost) or SEPIC topologies. These configurations are fundamentally different and serve different voltage conversion requirements. Boost regulators step voltage up from input to output, whereas buck regulators step voltage down. Using an incorrect topology will result in circuit malfunction.
Q: What packaging considerations should be evaluated when selecting a substitute?
A: The RT8470GSP uses an 8-SOIC (0.154", 3.90mm Width) Exposed Pad package. Direct pin-compatible substitutes include the LM3404MA/NOPB and LM3404HVMAX/NOPB, which use identical 8-SOIC packaging. The LM3414MRX/NOPB uses 8-PowerSOIC, which maintains the same pin count and footprint compatibility. The LM3405AXMKE/NOPB uses SOT-23-6, which requires PCB layout modification. The LM3406HVMH/NOPB uses 14-HTSSOP, requiring significant layout redesign.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All parts listed in this reference maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements equivalent to the RT8470GSP.
Q: What is the difference between Moisture Sensitivity Level (MSL) 3 and MSL 1?
A: The RT8470GSP carries MSL 3 (168 Hours), indicating a 168-hour floor life after moisture exposure. Most substitute parts carry MSL 1 (Unlimited), indicating no time-limited floor life requirement. MSL 1 provides greater handling flexibility and reduced risk of moisture-induced failures during storage and assembly processes.
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