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RT8471GSP LED Driver IC Equivalent & Substitute Parts
Part Overview
The RT8471GSP is an active LED driver IC manufactured by Richtek USA Inc., designed for step-down (buck) topology DC-DC regulation with integrated PWM and analog dimming control. This 8-SOP-EP package device delivers 1.2A output current across a 7V to 36V input supply range, operating from -40°C to 125°C. The part is ROHS3 compliant and actively produced. Equivalent and substitute parts are identified when design requirements necessitate alternative packaging, thermal performance, supply voltage ranges, or output current specifications while maintaining core LED driver functionality.
Substiute Parts
Key Parameters
| Parameter | RT8471GSP |
|---|---|
| Manufacturer | Richtek USA Inc. |
| Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| Voltage - Supply (Min) | 7V |
| Voltage - Supply (Max) | 36V |
| Current - Output / Channel | 1.2A |
| Dimming | Analog, PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution logic for the RT8471GSP is based on the following critical parameters: DC-DC regulator topology (step-down buck), internal integrated switch, single output configuration, PWM and analog dimming capability, and operating temperature range (-40°C to 125°C). Substitute parts must maintain these core functional attributes. Secondary considerations include input voltage range compatibility (minimum 7V to 36V maximum), output current capability (1.2A nominal), and surface mount packaging suitable for LED driver applications. Parts are grouped by packaging form factor and thermal performance characteristics while preserving electrical compatibility within the specified operating envelope.
Parameter Comparison
| Parameter | RT8471GSP | AL8861Y-13 | IS31LT3352-V1GRLS2-TR | IS31LT3360-SDLS4-TR | LM3404HVMRX/NOPB | LM3405AXMY/NOPB | LM3405XMK/NOPB | LM3406HVMHX/NOPB | LT3474EFE#PBF | LT3474IFE#PBF | LT3932HUFD#PBF |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Topology | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) |
| Internal Switch(s) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Min) | 7V | 4.5V | 6V | 6V | 6V | 3V | 3V | 6V | 4.6V | 4.6V | 3.6V |
| Voltage - Supply (Max) | 36V | 40V | 40V | 40V | 75V | 22V | 15V | 75V | 36V | 36V | 36V |
| Current - Output / Channel | 1.2A | 1.5A | 750mA | 1.2A (Switch) | 1A | 1A | 1A | 1.5A | 1A | 1A | 2A |
| Dimming | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM | PWM | PWM | PWM | PWM | PWM | PWM | Analog, PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 150°C (TJ) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) Exposed Pad | SOT-89-5/6 | 8-SOIC (0.154", 3.90mm Width) | SOT-89-5/6 | 8-PowerSOIC (0.154", 3.90mm Width) | 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width) | SOT-23-6 Thin, TSOT-23-6 | 14-PowerTSSOP (0.173", 4.40mm Width) | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad | 28-WFQFN Exposed Pad |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the RT8471GSP. Selection among substitutes depends on specific application constraints:
AL8861Y-13 (Diodes Incorporated) provides higher output current (1.5A) and extended maximum supply voltage (40V) in a compact SOT-89-5 package. Operating temperature is limited to -40°C to 85°C, suitable for non-extended-temperature applications.
IS31LT3352-V1GRLS2-TR (Lumissil Microsystems) offers reduced output current (750mA) in an 8-SOP package matching the RT8471GSP footprint. Operating temperature is -40°C to 85°C.
IS31LT3360-SDLS4-TR (Lumissil Microsystems) matches the RT8471GSP output current (1.2A) and full operating temperature range (-40°C to 125°C) in a SOT-89-5 package. This part includes automotive-grade qualification.
LM3404HVMRX/NOPB (Texas Instruments) supports extended supply voltage (6V to 75V) with 1A output current and automotive-grade qualification. Operating temperature extends to -40°C to 125°C in an 8-PowerSOIC package.
LM3405AXMY/NOPB (Texas Instruments) operates across 3V to 22V with 1A output and full temperature range (-40°C to 125°C) in an 8-HVSSOP package. MSL rating is 1 (Unlimited).
LM3405XMK/NOPB (Texas Instruments) provides compact TSOT-23-6 packaging with 1A output, 3V to 15V supply range, and full temperature rating. MSL is 1 (Unlimited).
LM3406HVMHX/NOPB (Texas Instruments) delivers 1.5A output with extended supply voltage (6V to 75V), automotive qualification, and full temperature range in a 14-HTSSOP package.
LT3474EFE#PBF and LT3474IFE#PBF (Analog Devices Inc.) both provide 1A output across 4.6V to 36V supply in 16-TSSOP-EP packages with automotive qualification. LT3474IFE#PBF extends operating temperature to -40°C to 125°C.
LT3932HUFD#PBF (Analog Devices Inc.) offers the highest output current (2A) with analog and PWM dimming, 3.6V to 36V supply range, and extended operating temperature to -40°C to 150°C in a 28-QFN package with automotive qualification.
Frequently Asked Questions (FAQ)
Q: Can AL8861Y-13 replace RT8471GSP in all applications? A: AL8861Y-13 is functionally compatible for most LED driver applications due to matching topology, dimming capability, and supply voltage overlap (7V to 36V range). However, the operating temperature maximum is limited to 85°C versus 125°C for the RT8471GSP. Applications requiring extended temperature operation above 85°C require alternative selection.
Q: What is the primary difference between IS31LT3352-V1GRLS2-TR and IS31LT3360-SDLS4-TR? A: IS31LT3352-V1GRLS2-TR provides 750mA output current in an 8-SOP package with -40°C to 85°C operating range. IS31LT3360-SDLS4-TR matches the RT8471GSP output current (1.2A) and extends operating temperature to -40°C to 125°C in a SOT-89-5 package. IS31LT3360-SDLS4-TR includes automotive-grade qualification.
Q: Why do some substitutes support higher supply voltages than the RT8471GSP? A: Parts such as LM3404HVMRX/NOPB and LM3406HVMHX/NOPB support 75V maximum supply voltage to address applications requiring higher input rails. The RT8471GSP is specified for 36V maximum. Selection depends on actual system supply voltage requirements.
Q: Which substitute offers the smallest package footprint? A: LM3405XMK/NOPB in TSOT-23-6 package provides the most compact form factor. This part is suitable for space-constrained designs with 1A output and 3V to 15V supply range.
Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance matching the RT8471GSP regulatory status.
Q: What is the significance of MSL (Moisture Sensitivity Level) ratings? A: MSL ratings indicate moisture sensitivity during storage and handling. MSL 1 (Unlimited) parts such as LM3405AXMY/NOPB, LM3405XMK/NOPB, and LT3474 series have no moisture-related storage restrictions. MSL 3 (168 Hours) parts including RT8471GSP and AL8861Y-13 require controlled storage conditions and baking procedures if moisture absorption occurs.
Q: Can LT3932HUFD#PBF be used as a direct replacement for RT8471GSP? A: LT3932HUFD#PBF is functionally compatible with enhanced specifications: 2A output current (versus 1.2A), extended temperature to 150°C, and dual dimming modes. The 28-QFN package differs from the 8-SOP-EP footprint, requiring PCB layout redesign. This part is suitable for applications requiring higher current capacity and extended thermal performance.
Q: Which substitutes include automotive-grade qualification? A: IS31LT3360-SDLS4-TR, LM3404HVMRX/NOPB, LM3406HVMHX/NOPB, LT3474EFE#PBF, LT3474IFE#PBF, and LT3932HUFD#PBF carry automotive-grade designation, suitable for automotive lighting and high-reliability applications.
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