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RT8474AGSP LED Driver IC Equivalent & Substitute Parts
Part Overview
The RT8474AGSP is an active LED driver IC manufactured by Richtek USA Inc., designed as a step-down (buck) DC-DC regulator with integrated PWM and analog dimming capabilities. This single-output device delivers 2A switch current and operates across a 4.5V to 50V supply range, making it suitable for backlight applications. With 1,244 units currently in stock and active product status, the RT8474AGSP remains available for new designs. Equivalent and substitute parts are identified when supply constraints, lead time requirements, or specific application parameters necessitate alternative component selection while maintaining functional compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | RT8474AGSP |
| Manufacturer | Richtek USA Inc. |
| Product Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Voltage Supply Range | 4.5V to 50V |
| Output Current | 2A (Switch) |
| Switching Frequency | 500kHz |
| Dimming Capability | Analog, PWM |
| Operating Temperature | -40°C to 85°C (TA) |
| Package Type | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| Product Status | Active |
| RoHS Compliance | ROHS3 Compliant |
| Moisture Sensitivity Level | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitute parts for the RT8474AGSP are selected based on the following critical parameters that determine functional compatibility:
Primary Substitution Criteria:
- Topology: Step-Down (Buck) configuration with internal switch
- Dimming: Analog and/or PWM dimming capability
- Output Current: Minimum 2A switch current or equivalent
- Supply Voltage Range: Overlap with 4.5V to 50V input range
- Package: Surface mount with similar form factor considerations
- Product Status: Active or available inventory status
Secondary Compatibility Factors:
- Operating temperature range (-40°C minimum, 85°C or higher maximum)
- RoHS3 compliance and REACH unaffected status
- Single output configuration
- Internal switch integration
Parts are grouped into two categories: direct functional equivalents (matching topology, current rating, and dimming) and compatible alternatives (meeting core requirements with acceptable parameter variations for specific applications).
Parameter Comparison
| Parameter | RT8474AGSP | A6214KLKTR-T | AP8803WTG-7 | CAV4201TD-GT3 | LM3404MA/NOPB | LM3414HVMR/NOPB |
|---|---|---|---|---|---|---|
| Manufacturer | Richtek USA Inc. | Allegro MicroSystems | Diodes Incorporated | onsemi | Texas Instruments | Texas Instruments |
| Topology | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) |
| Supply Voltage Min | 4.5V | 4.5V | 8V | 6.5V | 6V | 4.5V |
| Supply Voltage Max | 50V | 55V | 30V | 36V | 42V | 65V |
| Output Current | 2A (Switch) | 2A | 1A (Switch) | 350mA | 1A | 1A |
| Switching Frequency | 500kHz | — | 700kHz | 50kHz ~ 1MHz | 1MHz | 500kHz |
| Dimming | Analog, PWM | Analog, PWM | Analog, PWM | Analog | PWM | Analog, PWM |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Package | 8-SOIC Exposed Pad | 10-LSOP Exposed Pad | SOT-23-5 Thin | SOT-23-5 Thin | 8-SOIC | 8-PowerSOIC |
| Product Status | Active | Active | Active | Last Time Buy | Active | Active |
| RoHS Compliance | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 |
| Moisture Sensitivity | 3 (168 Hours) | 2A (4 Weeks) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) |
Engineering Selection Recommendations
Direct Functional Equivalents (Highest Compatibility):
The LM3414HVMR/NOPB (Texas Instruments) provides the closest functional match to the RT8474AGSP. Both devices feature step-down topology, 4.5V minimum supply voltage, 1A output current, 500kHz switching frequency, and dual analog/PWM dimming capability. The LM3414HVMR/NOPB extends the maximum supply voltage to 65V and operating temperature to 125°C, offering enhanced thermal performance. Both maintain ROHS3 compliance and active product status. Package differences (8-PowerSOIC vs. 8-SOIC Exposed Pad) require PCB layout verification.
The A6214KLKTR-T (Allegro MicroSystems) matches the 2A output current specification and maintains 4.5V minimum supply voltage with extended 55V maximum rating. Dual dimming capability (Analog, PWM) and active product status align with RT8474AGSP requirements. The 10-LSOP package requires board redesign consideration. Operating temperature extends to 125°C with improved moisture sensitivity (2A vs. 3).
Compatible Alternatives (Application-Dependent):
The AP8803WTG-7 (Diodes Incorporated) operates as a step-down regulator with 1A output current and dual dimming modes. Supply voltage range (8V to 30V) limits compatibility to applications above 8V input. The SOT-23-5 package offers space savings for compact designs. Active product status and unlimited moisture sensitivity (MSL 1) provide handling advantages.
The LM3404MA/NOPB (Texas Instruments) delivers 1A output current in 8-SOIC package with PWM-only dimming. Supply range (6V to 42V) excludes low-voltage applications below 6V. Automotive grade qualification and active status support automotive lighting applications.
Not Recommended for Direct Substitution:
The CAV4201TD-GT3 (onsemi) carries Last Time Buy status, indicating discontinued product line. While functionally compatible as a step-down regulator with analog dimming, procurement risk and limited future availability make this unsuitable for new designs requiring long-term supply assurance.
The AP3602AKTR-G1 (Diodes Incorporated) employs step-up (boost) topology, fundamentally different from the RT8474AGSP buck configuration. Supply voltage range (2.7V to 5V) and 100mA output current do not align with RT8474AGSP specifications.
The IS31BL3508A-TTLS2-TR (Lumissil Microsystems) uses step-up topology with 1.6A switch current and 2.7V to 5.5V supply range, incompatible with the buck topology and higher voltage requirements of the RT8474AGSP.
Frequently Asked Questions (FAQ)
Q: Can the LM3414HVMR/NOPB replace the RT8474AGSP in all applications?
A: The LM3414HVMR/NOPB provides functional equivalence for applications requiring up to 1A output current with 4.5V to 65V supply input and dual dimming modes. Applications requiring the full 2A output current of the RT8474AGSP must use the A6214KLKTR-T or remain with the original part. PCB layout modifications are necessary due to package differences (8-PowerSOIC vs. 8-SOIC Exposed Pad).
Q: What is the impact of package differences between substitute parts?
A: Package differences affect PCB footprint, thermal dissipation, and board layout. The RT8474AGSP uses 8-SOIC Exposed Pad; the LM3414HVMR/NOPB uses 8-PowerSOIC; the A6214KLKTR-T uses 10-LSOP. Thermal performance varies with exposed pad size and copper area. Smaller packages (SOT-23-5) reduce board space but may limit current handling. Verify thermal requirements and PCB layout compatibility before substitution.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the RT8474AGSP.
Q: Which substitute part offers the best long-term availability?
A: The LM3404MA/NOPB, LM3414HVMR/NOPB, and A6214KLKTR-T all carry active product status with established manufacturer support. The CAV4201TD-GT3 is designated Last Time Buy and should be avoided for new designs. Current inventory levels (LM3404MA/NOPB: 10,765 units; A6214KLKTR-T: 8,826 units) indicate strong supply availability.
Q: Can PWM-only dimming parts (LM3404MA/NOPB) replace analog/PWM dimming parts?
A: PWM-only dimming parts are compatible only when the application design uses PWM dimming exclusively. Applications requiring analog dimming control cannot use PWM-only alternatives. The LM3414HVMR/NOPB and A6214KLKTR-T support both modes and provide greater design flexibility.
Q: What are the thermal operating range implications of substitute selection?
A: The RT8474AGSP operates to 85°C (TA). Most substitutes extend to 125°C (TJ or TA), providing thermal margin for high-ambient or high-power applications. This extended range does not create compatibility issues but may allow operation in more demanding thermal environments. Verify junction temperature calculations for specific applications.
Q: Is the AP3602AKTR-G1 a valid substitute?
A: No. The AP3602AKTR-G1 employs step-up (boost) topology, fundamentally different from the RT8474AGSP step-down (buck) configuration. Supply voltage range (2.7V to 5V) and 100mA output current are incompatible with RT8474AGSP specifications. This part is listed in the RT8474AGSP datasheet cross-reference but is not a functional equivalent.
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