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MP24875DN-LF-Z LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP24875DN-LF-Z is an active LED Driver IC manufactured by Monolithic Power Systems Inc., designed for step-down (buck) topology DC-DC regulation with PWM dimming capability. This 8-SOIC surface mount component delivers 1.5A switch current and operates across a 4.5V to 55V supply voltage range, making it suitable for automotive-grade lighting applications. The part is currently in active production status with 55,200 units in stock inventory.
Substitute parts are necessary when the original MP24875DN-LF-Z becomes unavailable, when alternative packaging is required for manufacturing constraints, or when design modifications necessitate different electrical specifications within compatible operating parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Monolithic Power Systems Inc. |
| Part Number | MP24875DN-LF-Z |
| Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Voltage Supply (Min) | 4.5V |
| Voltage Supply (Max) | 55V |
| Current Output / Channel | 1.5A (Switch) |
| Frequency | 200kHz |
| Dimming | PWM |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | Automotive |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the MP24875DN-LF-Z is determined by the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Down (Buck) configuration with internal switch
- Number of Outputs: Single output only
- Dimming Control: PWM capability required
- Supply Voltage Range: Minimum 4.5V input support
- Current Capacity: 1.5A or greater switch current
- Grade: Automotive qualification preferred for consistency
- RoHS Compliance: ROHS3 Compliant
Secondary Compatibility Factors:
- Operating Temperature Range: -40°C minimum and 85°C or higher maximum
- Package Type: Surface mount with exposed pad preferred
- Frequency: 200kHz or higher switching frequency
Substitute parts are grouped into two categories based on electrical compatibility:
Category A - Direct Electrical Equivalents (1.5A+ Current, 4.5V+ Supply, PWM Dimming): AL8860MP-13, LM3402HVMRX/NOPB, LM3404HVMAX/NOPB, LM3404MRX/NOPB, LT3474EFE-1#PBF
Category B - Enhanced Capability Substitutes (Higher Current or Extended Features): A6214KLKTR-T (2A current, analog + PWM dimming)
Category C - Limited Substitutes (Lower Current or Restricted Supply Range): AP8803WTG-7 (1A current, 8V minimum supply), CAV4201TD-GT3 (350mA current, 6.5V minimum supply)
Category D - Non-Compatible (Different Topology): BD6164GUT-E2 (Step-Up/Boost topology, not substitutable)
Parameter Comparison
| Part Number | Manufacturer | Topology | Supply Min (V) | Supply Max (V) | Current (A) | Frequency (kHz) | Dimming | Temp Range (°C) | Package | Grade | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MP24875DN-LF-Z | Monolithic Power Systems | Buck | 4.5 | 55 | 1.5 | 200 | PWM | -40 ~ 85 | 8-SOIC | Automotive | Active |
| A6214KLKTR-T | Allegro MicroSystems | Buck | 4.5 | 55 | 2.0 | — | Analog, PWM | -40 ~ 125 | 10-SOIC | Automotive | Active |
| AL8860MP-13 | Diodes Incorporated | Buck | 4.5 | 40 | 1.5 | 1000 | Analog, PWM | -40 ~ 105 | 8-MSOP | — | Active |
| AP8803WTG-7 | Diodes Incorporated | Buck | 8.0 | 30 | 1.0 | 700 | Analog, PWM | -40 ~ 125 | TSOT-23-5 | — | Active |
| BD6164GUT-E2 | ROHM Semiconductor | Boost | 2.7 | 4.5 | 0.32 | 4000 | I2C | -30 ~ 85 | 6-VCSP60N1 | — | Active |
| CAV4201TD-GT3 | onsemi | Buck | 6.5 | 36 | 0.35 | 50 ~ 1000 | Analog | -40 ~ 125 | TSOT-23-5 | — | Last Time Buy |
| LM3402HVMRX/NOPB | National Semiconductor | Buck | 6.0 | 75 | 0.5 | 1000 | PWM | -40 ~ 125 | 8-SO PowerPad | — | Active |
| LM3404HVMAX/NOPB | Texas Instruments | Buck | 6.0 | 75 | 1.0 | 1000 | PWM | -40 ~ 125 | 8-SOIC | Automotive | Active |
| LM3404MRX/NOPB | Texas Instruments | Buck | 6.0 | 42 | 1.0 | 1000 | PWM | -40 ~ 125 | 8-SO PowerPad | Automotive | Active |
| LM3405XMKX/NOPB | Texas Instruments | Buck | 3.0 | 15 | 1.0 | 1600 | PWM | -40 ~ 125 | TSOT-23-6 | — | Active |
| LT3474EFE-1#PBF | Analog Devices Inc. | Buck | 4.6 | 36 | 1.0 | 200 ~ 2000 | PWM | -40 ~ 85 | 16-TSSOP | Automotive | Active |
Engineering Selection Recommendations
Recommended Direct Substitutes (Highest Compatibility):
AL8860MP-13 and A6214KLKTR-T are the primary substitutes for the MP24875DN-LF-Z. Both maintain step-down buck topology with PWM dimming capability and automotive-grade specifications. AL8860MP-13 matches the 1.5A current specification exactly and operates within the 4.5V to 40V supply range, though with a reduced maximum voltage compared to the original. A6214KLKTR-T provides enhanced 2A current capacity while maintaining the full 4.5V to 55V supply range, offering greater design margin for higher-power lighting applications.
Secondary Substitutes (Conditional Use):
LM3404HVMAX/NOPB and LM3404MRX/NOPB are automotive-grade alternatives from Texas Instruments with PWM dimming and active product status. Both feature 1A current capacity (below the original 1.5A specification) and require minimum 6V supply input. These parts are suitable only when application current requirements do not exceed 1A and when the 6V minimum supply voltage is acceptable.
LT3474EFE-1#PBF is an automotive-grade option with PWM dimming and active status, but operates at reduced 1A current and requires 4.6V minimum supply. This part is appropriate for lower-power lighting designs.
Non-Recommended Substitutes:
AP8803WTG-7 has restricted supply voltage range (8V minimum) and reduced current capacity (1A), making it unsuitable for applications requiring the full 4.5V to 55V input range of the original part.
CAV4201TD-GT3 carries "Last Time Buy" product status and offers only 350mA current capacity with 6.5V minimum supply, providing insufficient performance for most MP24875DN-LF-Z applications.
BD6164GUT-E2 uses step-up (boost) topology instead of step-down, operates at 320mA current, and is designed for camera flash applications. This part is not electrically compatible with the MP24875DN-LF-Z.
Compliance Considerations:
All recommended substitutes maintain ROHS3 compliance and EAR99 ECCN classification consistent with the original part. Automotive-grade substitutes (A6214KLKTR-T, LM3404HVMAX/NOPB, LM3404MRX/NOPB, LT3474EFE-1#PBF) are preferred for automotive lighting applications to ensure design consistency and qualification alignment.
Frequently Asked Questions (FAQ)
Q: Can the MP24875DN-LF-Z be replaced with a part having lower current capacity?
A: Substitution with lower current capacity (such as LM3402HVMRX/NOPB at 500mA or AP8803WTG-7 at 1A) is only acceptable if the application's actual LED current draw does not exceed the substitute part's rated capacity. The original 1.5A specification must be verified against actual circuit requirements before downrating.
Q: What is the impact of using a substitute with a different maximum supply voltage?
A: The MP24875DN-LF-Z operates to 55V maximum. Substitutes with lower maximum ratings (such as AL8860MP-13 at 40V or AP8803WTG-7 at 30V) cannot be used in applications requiring the full 55V input range. Verify the actual supply voltage in your design before selecting a substitute with reduced maximum rating.
Q: Are package differences between substitutes significant?
A: Yes. The original MP24875DN-LF-Z uses 8-SOIC packaging. Substitutes with different packages (such as A6214KLKTR-T in 10-SOIC, AL8860MP-13 in 8-MSOP, or AP8803WTG-7 in TSOT-23-5) require PCB layout modifications, different footprints, and potential changes to thermal management. Package selection must align with available PCB design resources.
Q: Why is BD6164GUT-E2 listed but not recommended?
A: BD6164GUT-E2 uses step-up (boost) topology rather than step-down (buck) topology. It is electrically incompatible with the MP24875DN-LF-Z despite both being LED driver ICs. Boost converters are used for applications requiring output voltage higher than input voltage, whereas buck converters step voltage down. These topologies are not interchangeable.
Q: Can I use a substitute with PWM and analog dimming capability instead of PWM-only?
A: Yes. Parts offering both PWM and analog dimming (such as A6214KLKTR-T and AL8860MP-13) are backward-compatible with PWM-only designs. The additional analog dimming capability does not interfere with PWM operation and provides design flexibility for future modifications.
Q: What does "Last Time Buy" product status mean for CAV4201TD-GT3?
A: "Last Time Buy" indicates the manufacturer has announced end-of-life for this part. While currently available in inventory, future availability is not guaranteed. CAV4201TD-GT3 should not be selected for new designs requiring long-term production support.
Q: Are all recommended substitutes automotive-grade?
A: No. AL8860MP-13 does not carry automotive-grade designation. For automotive lighting applications, automotive-grade substitutes (A6214KLKTR-T, LM3404HVMAX/NOPB, LM3404MRX/NOPB, LT3474EFE-1#PBF) are preferred to maintain design qualification consistency with the original MP24875DN-LF-Z.
Q: What is the minimum supply voltage requirement for substitutes?
A: The MP24875DN-LF-Z operates from 4.5V minimum. Substitutes with higher minimum requirements (LM3402HVMRX/NOPB and LM3404 variants at 6V, AP8803WTG-7 at 8V, CAV4201TD-GT3 at 6.5V) cannot be used in applications with supply voltages below their specified minimums. Verify your circuit's minimum supply voltage before selecting a substitute.
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