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RT8471GFP LED Driver IC Equivalent & Substitute Parts
Part Overview
The RT8471GFP is a LED Driver IC manufactured by Richtek USA Inc., classified as a Power Management (PMIC) component. This device functions as a 1-output DC-DC regulator with step-down (buck) topology, delivering 1.2A output current with analog and PWM dimming capabilities. The part is rated for automotive-grade applications and operates across a 7V to 36V supply voltage range, with an operating temperature range of -40°C to 125°C (TJ). The RT8471GFP is currently in active product status with 19,100 units in stock inventory.
Substitute parts are necessary when the RT8471GFP becomes unavailable, when design requirements demand alternative electrical specifications, or when different package configurations are required for manufacturing or assembly constraints.
Substiute Parts
Key Parameters
| Parameter | RT8471GFP Value |
|---|---|
| Manufacturer | Richtek USA Inc. |
| Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 7V |
| Voltage - Supply (Max) | 36V |
| Current - Output / Channel | 1.2A |
| Dimming | Analog, PWM |
| Applications | Lighting, Signage |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Grade | Automotive |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitute parts for the RT8471GFP are categorized based on strict alignment with the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Down (Buck) configuration
- Number of Outputs: Single output (1)
- Dimming Capability: Analog and/or PWM dimming support
- Current Rating: Output current capacity of 1.2A or greater
- Supply Voltage Range: Minimum 7V input capability
- Applications: Lighting-focused designs
- Package Type: Surface mount configurations
Substitution Logic: Parts are grouped into two categories based on topology alignment:
- Direct Buck Topology Substitutes – Parts maintaining step-down (buck) topology with comparable or higher current ratings and lighting applications
- Alternative Topology Substitutes – Parts with different topologies (boost, flyback, SEPIC) that may serve lighting applications but require circuit redesign
The RT8471GFP's automotive-grade classification and -40°C to 125°C temperature range establish the upper performance tier. Substitutes with lower temperature ranges or non-automotive grades represent functional alternatives for non-automotive applications.
Parameter Comparison
| Parameter | RT8471GFP | A6211GLJTR-T | ILD6070XUMA1 | LM3405AXMKE/NOPB | LM3414HVSD/NOPB | LT3477EUF#TRPBF |
|---|---|---|---|---|---|---|
| Manufacturer | Richtek USA Inc. | Allegro MicroSystems | Infineon Technologies | Texas Instruments | Texas Instruments | Analog Devices Inc. |
| Topology | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Min) | 7V | 6V | 4.5V | 3V | 4.5V | 2.5V |
| Voltage - Supply (Max) | 36V | 48V | 60V | 22V | 65V | 25V |
| Current - Output / Channel | 1.2A | 3A | 700mA | 1A | 1A | 3A (Switch) |
| Dimming | Analog, PWM | PWM | Analog, PWM | PWM | Analog, PWM | PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 105°C (TA) | -40°C ~ 150°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) |
| Grade | Automotive | — | — | — | Automotive | — |
| Package / Case | 8-TSSOP, 8-MSOP | 8-SOIC-EP | 8-SOIC-EP | SOT-23-6 | 8-WFDFN Exposed Pad | 20-WFQFN Exposed Pad |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Obsolete | Active | Active | Active |
Engineering Selection Recommendations
Recommended Direct Substitutes (Step-Down Buck Topology):
A6211GLJTR-T (Allegro MicroSystems) – Maintains step-down buck topology with 3A output current, exceeding the RT8471GFP's 1.2A specification. Supply voltage range of 6V to 48V encompasses the RT8471GFP's 7V to 36V requirement. PWM dimming is supported. Operating temperature range of -40°C to 105°C is slightly lower than the RT8471GFP. Package is 8-SOIC-EP. ROHS3 compliant. Suitable for lighting applications where higher current capacity is beneficial.
LM3414HVSD/NOPB (Texas Instruments) – Maintains step-down buck topology with 1A output current, slightly below the RT8471GFP's 1.2A specification. Supply voltage range of 4.5V to 65V exceeds the RT8471GFP's 7V to 36V range. Analog and PWM dimming are supported. Operating temperature range of -40°C to 125°C matches the RT8471GFP exactly. Automotive-grade classification aligns with RT8471GFP. Package is 8-WFDFN Exposed Pad. ROHS3 compliant. Recommended for automotive lighting applications requiring temperature performance parity.
LM3405AXMKE/NOPB (Texas Instruments) – Maintains step-down buck topology with 1A output current. Supply voltage range of 3V to 22V is narrower than the RT8471GFP's 7V to 36V range. PWM dimming is supported; analog dimming is not available. Operating temperature range of -40°C to 125°C matches the RT8471GFP. Package is SOT-23-6. ROHS3 compliant. Suitable for lighting applications within the 3V to 22V input range.
ILD6070XUMA1 (Infineon Technologies) – Maintains step-down buck topology with 700mA output current, below the RT8471GFP's 1.2A specification. Supply voltage range of 4.5V to 60V exceeds the RT8471GFP's 7V to 36V range. Analog and PWM dimming are supported. Operating temperature range of -40°C to 150°C exceeds the RT8471GFP. Product status is obsolete; use only when existing inventory is available. Package is 8-SOIC-EP. ROHS3 compliant.
Alternative Topology Substitute:
LT3477EUF#TRPBF (Analog Devices Inc.) – Supports multiple topologies including step-down buck, step-up boost, flyback, and SEPIC configurations. Output current is 3A (switch), exceeding the RT8471GFP's 1.2A specification. Supply voltage range of 2.5V to 25V is narrower than the RT8471GFP's 7V to 36V range. PWM dimming is supported. Operating temperature range of -40°C to 85°C is lower than the RT8471GFP. Package is 20-WFQFN Exposed Pad. ROHS3 compliant. Requires circuit redesign to implement buck topology configuration.
Compliance & Certification Basis: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the RT8471GFP's regulatory posture. Automotive-grade substitutes (LM3414HVSD/NOPB) are preferred for automotive lighting and signage applications. Non-automotive substitutes are suitable for commercial lighting applications.
Frequently Asked Questions (FAQ)
Q: Can the A6211GLJTR-T replace the RT8471GFP in all applications?
A: The A6211GLJTR-T maintains step-down buck topology and supports PWM dimming, making it functionally compatible for lighting applications. However, the A6211GLJTR-T is not automotive-grade, while the RT8471GFP is. For automotive lighting and signage applications, the LM3414HVSD/NOPB is the preferred substitute due to its automotive-grade classification and matching -40°C to 125°C temperature range.
Q: What is the significance of the current rating difference between the RT8471GFP (1.2A) and substitute parts?
A: The RT8471GFP delivers 1.2A output current. Substitutes with higher current ratings (A6211GLJTR-T at 3A, LT3477EUF#TRPBF at 3A) provide additional design margin and can support higher LED load currents. Substitutes with lower current ratings (ILD6070XUMA1 at 700mA, LM3405AXMKE/NOPB at 1A) may require circuit modifications or are suitable only for lower-power lighting applications.
Q: Why is the LM3414HVSD/NOPB recommended over other substitutes?
A: The LM3414HVSD/NOPB matches the RT8471GFP's automotive-grade classification and operating temperature range (-40°C to 125°C). It maintains step-down buck topology, supports both analog and PWM dimming, and delivers 1A output current. These characteristics make it the most direct functional equivalent for automotive lighting and signage applications.
Q: Does the supply voltage range difference affect substitution compatibility?
A: Yes. The RT8471GFP operates from 7V to 36V. Substitutes with narrower ranges (LM3405AXMKE/NOPB: 3V to 22V) are compatible only within their specified range. Substitutes with wider ranges (LM3414HVSD/NOPB: 4.5V to 65V, A6211GLJTR-T: 6V to 48V) provide broader input voltage flexibility and are preferred when the application requires operation across the full 7V to 36V range.
Q: What package considerations apply when selecting a substitute?
A: The RT8471GFP uses 8-TSSOP or 8-MSOP packaging (0.118", 3.00mm width). Substitutes employ different packages: A6211GLJTR-T uses 8-SOIC-EP, LM3414HVSD/NOPB uses 8-WFDFN, LM3405AXMKE/NOPB uses SOT-23-6, and LT3477EUF#TRPBF uses 20-WFQFN. Package differences require PCB layout modifications and may affect thermal performance. Verify PCB footprint compatibility before design implementation.
Q: Is the LT3477EUF#TRPBF suitable as a direct replacement?
A: The LT3477EUF#TRPBF supports multiple topologies including step-down buck configuration, but requires circuit design changes to implement buck topology operation. The supply voltage range (2.5V to 25V) is narrower than the RT8471GFP's 7V to 36V range. The operating temperature range (-40°C to 85°C) is lower. Use only when multi-topology flexibility is required and circuit redesign is acceptable.
Q: Why is ILD6070XUMA1 marked as obsolete?
A: The ILD6070XUMA1 is listed with obsolete product status. While it maintains step-down buck topology and supports analog and PWM dimming, it should be used only when existing inventory is available. For new designs, select from active-status substitutes such as LM3414HVSD/NOPB or A6211GLJTR-T.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the RT8471GFP's regulatory compliance posture. This ensures compatibility with environmental and hazardous substance regulations across manufacturing and end-use jurisdictions.
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