MP2370DJ-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP2370DJ-LF-Z is an active LED driver IC manufactured by Monolithic Power Systems, designed as a DC-DC regulator with step-down (buck) topology. This single-output device operates across a 4.5V to 24V supply range and delivers 15V output with PWM dimming capability at 1.4MHz switching frequency. The component is housed in a TSOT-23-6 surface mount package and maintains RoHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain disruptions, or specific application demands that align with the electrical and mechanical parameters of the original component.

Key Parameters

Parameter	MP2370DJ-LF-Z
Manufacturer	Monolithic Power Systems
Package Type	TSOT-23-6
Topology	Step-Down (Buck)
Supply Voltage Range	4.5V – 24V
Output Voltage	15V
Switching Frequency	1.4MHz
Dimming Control	PWM
Operating Temperature	-40°C to 85°C (TA)
Internal Switch	Yes
Number of Outputs	1
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the MP2370DJ-LF-Z are qualified based on the following criteria:

Primary Compatibility Parameters:

DC-DC regulator topology: Step-down (buck) configuration
Single output channel
Internal integrated switch
PWM dimming capability
Supply voltage overlap: minimum 4.5V and maximum ≥24V
Operating temperature range: -40°C minimum and ≥85°C maximum
RoHS3 compliance
Surface mount technology

Secondary Considerations:

Package form factor (TSOT-23-6 preferred for direct replacement; alternative packages acceptable for functional equivalence)
Switching frequency in the 1MHz to 1.6MHz range
Output voltage capability supporting 15V operation

The substitute parts listed below meet these criteria and are classified into two functional groups: direct package replacements and functional equivalents with alternative packaging.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage (Min–Max)	Output Voltage	Current Rating	Frequency	Dimming	Temp Range	RoHS
MP2370DJ-LF-Z	Monolithic Power Systems	TSOT-23-6	4.5V – 24V	15V	—	1.4MHz	PWM	-40°C to 85°C	ROHS3
LM3405XMK/NOPB	Texas Instruments	TSOT-23-6	3V – 15V	14.6V	1A	1.6MHz	PWM	-40°C to 125°C	ROHS3
AL8861WT-7	Diodes Incorporated	TSOT-23-5	4.5V – 40V	36V	1A	1MHz	Analog, PWM	-40°C to 85°C	ROHS3
AL8861MP-13	Diodes Incorporated	8-MSOP-EP	4.5V – 40V	36V	1.5A	1MHz	Analog, PWM	-40°C to 85°C	ROHS3
ILD6150XUMA1	Infineon Technologies	PG-DSO-8	4.5V – 60V	—	1.5A	1MHz	Analog, PWM	-40°C to 150°C	ROHS3
IS31LT3350-V1SDLS2-TR	Lumissil Microsystems	SOT-89-5	6V – 40V	—	650mA	1MHz	Analog, PWM	-40°C to 85°C	ROHS3
A6216KLPTR-T	Allegro MicroSystems	16-eTSSOP-EP	4.5V – 55V	—	2A	—	Analog, PWM	-40°C to 125°C	ROHS3
LED2000PUR	STMicroelectronics	8-VFQFPN	3V – 18V	—	3A	850kHz	PWM	-40°C to 150°C	ROHS3
LM3404HVMA/NOPB	Texas Instruments	8-SOIC	6V – 75V	73V	1A	1MHz	PWM	-40°C to 125°C	ROHS3
LT3474EFE-1#TRPBF	Analog Devices Inc.	16-TSSOP-EP	4.6V – 36V	—	1A	200kHz – 2MHz	PWM	-40°C to 85°C	ROHS3
LM3410YMF/NOPB	Texas Instruments	SOT-23-5	2.7V – 5.5V	3V – 24V	2.8A	525kHz	PWM	-40°C to 125°C	ROHS3

Engineering Selection Recommendations

Direct Package Replacement (TSOT-23-6): The LM3405XMK/NOPB from Texas Instruments provides the closest form factor match to the MP2370DJ-LF-Z. Both devices utilize TSOT-23-6 packaging, enabling direct PCB footprint compatibility. The LM3405XMK/NOPB operates across 3V to 15V with 1.6MHz switching frequency and PWM dimming, supporting 15V output operation. This part maintains RoHS3 compliance and extends the operating temperature range to 125°C (TJ), providing enhanced thermal performance. The 1A current rating aligns with typical LED driver applications.

Functional Equivalents with Extended Supply Range: The AL8861WT-7 and AL8861MP-13 from Diodes Incorporated both support the 4.5V minimum supply threshold and extend maximum supply voltage to 40V, offering greater input voltage flexibility. Both maintain PWM dimming capability and RoHS3 compliance. The AL8861WT-7 preserves the -40°C to 85°C operating range matching the original part. The AL8861MP-13 provides 1.5A current capacity in an 8-MSOP-EP package.

High-Temperature and Extended-Range Options: The ILD6150XUMA1 from Infineon Technologies supports supply voltages up to 60V and operates to 150°C junction temperature, suitable for demanding thermal environments. The LM3404HVMA/NOPB from Texas Instruments extends supply voltage to 75V with automotive-grade qualification (AEC-Q100) and 125°C operating temperature.

All substitute parts listed maintain:

RoHS3 compliance
Active product status
Single-output DC-DC buck topology with internal switch
PWM dimming control
Surface mount technology
Operating temperature minimum of -40°C

Frequently Asked Questions (FAQ)

Q: Can the LM3405XMK/NOPB directly replace the MP2370DJ-LF-Z on the PCB?

A: Yes. Both devices use TSOT-23-6 packaging with identical pin counts and footprints. Direct PCB substitution is possible without layout modifications. Verify that the 3V to 15V supply range and 14.6V output voltage specification meet your application requirements.

Q: What is the primary difference between the AL8861WT-7 and AL8861MP-13?

A: The AL8861WT-7 uses TSOT-23-5 packaging with 1A current rating, while the AL8861MP-13 uses 8-MSOP-EP packaging with 1.5A current rating. Both support 4.5V to 40V supply voltage and 1MHz switching frequency with PWM dimming. Package selection depends on PCB layout constraints and current requirements.

Q: Why does the LM3410YMF/NOPB appear in the substitute list if it uses SEPIC topology?

A: The LM3410YMF/NOPB is included because it meets the core functional criteria: single-output LED driver IC with PWM dimming, internal switch, RoHS3 compliance, and -40°C to 125°C operating range. However, its SEPIC/boost topology differs from the buck topology of the MP2370DJ-LF-Z. This part is suitable only when output voltage requirements (3V to 24V range) and lower input voltage range (2.7V to 5.5V) align with your application.

Q: Are all substitute parts automotive-qualified?

A: No. Only the A6216KLPTR-T and LM3404HVMA/NOPB carry automotive qualification (AEC-Q100). The remaining parts are industrial-grade components. Automotive applications require explicit AEC-Q100 certification.

Q: What packaging options are available for functional equivalents?

A: Substitute parts are available in TSOT-23-5, TSOT-23-6, 8-MSOP-EP, 8-SOIC, 8-VFQFPN, SOT-89-5, 16-eTSSOP-EP, and 16-TSSOP-EP packages. TSOT-23-6 and TSOT-23-5 options provide the smallest footprints. Larger packages (8-SOIC, 16-TSSOP) offer enhanced thermal dissipation for higher current applications.

Q: Can I use a substitute part with a higher maximum supply voltage than the original?

A: Yes, provided your circuit design does not exceed the substitute part's maximum rating. Parts with higher voltage ratings (such as ILD6150XUMA1 at 60V or LM3404HVMA/NOPB at 75V) offer greater design margin and flexibility for varying input conditions. Verify that output voltage regulation and dimming control remain within specification.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL ratings indicate moisture exposure limits during storage and handling. MSL 1 (unlimited) allows indefinite storage without desiccant. MSL 2 (1 year) and MSL 3 (168 hours) require controlled storage conditions. The MP2370DJ-LF-Z carries MSL 1, while some substitutes (ILD6150XUMA1, IS31LT3350-V1SDLS2-TR) carry MSL 3, requiring stricter moisture control during assembly.

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