LM3402MM LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3402MM is a LED Driver IC manufactured by Texas Instruments, designed as a 1-output DC-DC regulator with step-down (buck) topology and PWM dimming capability. This device operates at 1MHz switching frequency with a maximum output current of 500mA, supporting supply voltages from 6V to 42V. The LM3402MM is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts must maintain functional compatibility in LED lighting applications while meeting current RoHS and REACH compliance requirements.

Key Parameters

Parameter	LM3402MM
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	6V
Voltage - Supply (Max)	42V
Voltage - Output	40V
Current - Output / Channel	500mA
Frequency	1MHz
Dimming	PWM
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	RoHS non-compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM3402MM are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Down (Buck) configuration
Number of Outputs: Single output
Dimming Method: PWM capability
Supply Voltage Range: Minimum 6V input support
Output Current: 500mA or greater
Package Type: Surface mount 8-pin or compatible footprint
Operating Temperature Range: -40°C to 125°C or wider

Parametric Equivalents maintain identical electrical specifications and base product lineage (LM3402 series variants with different packaging or compliance grades).

Manufacturer Recommended Substitutes offer functional equivalence through different topologies, current ratings, or supply voltage ranges while maintaining LED driver application suitability. These parts are selected based on active product status and current RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min (V)	Supply Max (V)	Output Current	Frequency	Dimming	Package	Status	RoHS
LM3402MM	Texas Instruments	Step-Down (Buck)	6	42	500mA	1MHz	PWM	8-TSSOP	Obsolete	Non-compliant
LM3402MM/NOPB	Texas Instruments	Step-Down (Buck)	6	42	500mA	1MHz	PWM	8-TSSOP	Active	ROHS3 Compliant
LM3402MMX/NOPB	Texas Instruments	Step-Down (Buck)	6	42	500mA	1MHz	PWM	8-TSSOP	Active	ROHS3 Compliant
MAX16832CASA+T	Analog Devices Inc./Maxim Integrated	Step-Down (Buck)	6.5	65	700mA	2MHz	PWM	8-SOIC	Active	ROHS3 Compliant
A6214KLKTR-T	Allegro MicroSystems	Step-Down (Buck)	4.5	55	2A	—	Analog, PWM	10-SOIC	Active	ROHS3 Compliant
ILD6070XUMA1	Infineon Technologies	Step-Down (Buck)	4.5	60	700mA	1MHz	Analog, PWM	8-SOIC	Obsolete	ROHS3 Compliant
LED2001PHR	STMicroelectronics	Step-Down (Buck)	3	18	4A	850kHz	PWM	8-SOIC	Active	ROHS3 Compliant
LED2001PUR	STMicroelectronics	Step-Down (Buck)	3	18	4A	850kHz	PWM	8-VFQFPN	Active	ROHS3 Compliant
LT3518EFE#TRPBF	Analog Devices Inc.	Step-Down (Buck), Step-Up (Boost)	3	30	2.3A (Switch)	250kHz ~ 2.5MHz	Analog, PWM	16-TSSOP	Active	ROHS3 Compliant
MAX1561ETA+T	Analog Devices Inc./Maxim Integrated	Step-Up (Boost)	2.6	5.5	950mA (Switch)	1MHz	Analog, PWM	8-TDFN	Active	ROHS3 Compliant
MIC2289C-34YD6-TR	Microchip Technology	Step-Up (Boost)	2.5	10	750mA (Switch)	1.2MHz	Analog, PWM	SOT-23-6	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended First Choice):

LM3402MM/NOPB and LM3402MMX/NOPB are direct parametric equivalents with identical electrical specifications and the same base product number. Both are active products with ROHS3 compliance, making them the preferred substitutes for new designs and production continuity. These parts maintain the same 8-TSSOP package footprint and do not require circuit redesign.

Active Substitutes with Enhanced Specifications:

MAX16832CASA+T offers higher output current (700mA vs. 500mA) and extended supply voltage range (6.5V to 65V vs. 6V to 42V) while maintaining PWM dimming and step-down topology. This part is suitable for applications requiring higher current capacity or wider input voltage tolerance.

LED2001PHR and LED2001PUR (STMicroelectronics) provide significantly higher output current (4A) with PWM dimming capability. These parts are suitable for higher-power LED applications but operate at lower maximum supply voltage (18V vs. 42V). LED2001PUR offers a compact 8-VFQFPN package alternative to the 8-HSOP variant.

Topology Variants for Specialized Applications:

LT3518EFE#TRPBF combines step-down and step-up (buck-boost) topology with higher current capability (2.3A switch current) and wider frequency range (250kHz to 2.5MHz). This part is suitable for applications requiring flexible input-to-output voltage relationships.

MAX1561ETA+T and MIC2289C-34YD6-TR are step-up (boost) topologies designed for backlight applications with lower input voltage requirements (2.6V to 5.5V and 2.5V to 10V respectively). These parts are not direct substitutes but serve alternative LED driver architectures.

Compliance and Availability:

All recommended active substitutes comply with ROHS3 and REACH requirements. Avoid ILD6070XUMA1 (Infineon) and A6214KLKTR-T (Allegro) for new designs due to obsolete status or automotive-grade qualification requirements not applicable to standard LED lighting applications.

Frequently Asked Questions (FAQ)

Q: Can LM3402MM/NOPB be used as a direct replacement for LM3402MM?

A: Yes. LM3402MM/NOPB is a parametric equivalent with identical electrical specifications, same package footprint (8-TSSOP), and active product status with ROHS3 compliance. No circuit modifications are required.

Q: What is the key difference between LM3402MM/NOPB and LM3402MMX/NOPB?

A: Both are parametric equivalents with identical electrical specifications and package type. The difference lies in manufacturing process or internal die revision (indicated by the "X" designation). Both are suitable for direct substitution.

Q: Can MAX16832CASA+T replace LM3402MM in all applications?

A: MAX16832CASA+T is functionally compatible for step-down LED driver applications. It offers higher output current (700mA vs. 500mA) and extended supply voltage range (up to 65V vs. 42V). However, the package is 8-SOIC instead of 8-TSSOP, requiring PCB layout changes. Verify that the higher current rating and different package do not conflict with your design constraints.

Q: Why are LED2001PHR and LED2001PUR listed as substitutes if they operate at lower maximum supply voltage?

A: These parts are suitable substitutes for applications where the input supply voltage does not exceed 18V. They provide significantly higher output current (4A) for higher-power LED strings. If your application requires the full 42V supply voltage range of the LM3402MM, these parts are not appropriate.

Q: What is the difference between PWM-only dimming and Analog/PWM dimming?

A: LM3402MM supports PWM dimming only. Substitutes offering both Analog and PWM dimming (such as A6214KLKTR-T and LT3518EFE#TRPBF) provide additional flexibility but require the same PWM control interface for compatibility. Analog dimming capability does not affect PWM operation.

Q: Are step-up (boost) topology parts like MAX1561ETA+T suitable replacements?

A: No. Step-up topology is fundamentally different from the step-down topology of LM3402MM. MAX1561ETA+T and MIC2289C-34YD6-TR are designed for backlight applications with lower input voltages and cannot replace step-down regulators in standard LED driver circuits.

Q: What packaging considerations should I evaluate when selecting a substitute?

A: The LM3402MM uses 8-TSSOP package. Direct equivalents (LM3402MM/NOPB, LM3402MMX/NOPB) maintain this footprint. Substitutes like MAX16832CASA+T use 8-SOIC, LED2001PUR uses 8-VFQFPN, and LT3518EFE#TRPBF uses 16-TSSOP. Different packages require PCB redesign and may affect thermal performance. Verify package compatibility with your PCB layout before selection.

Q: Is RoHS compliance mandatory for my application?

A: The original LM3402MM is RoHS non-compliant. All recommended active substitutes are ROHS3 compliant. If your application or supply chain requires RoHS compliance, select only active substitutes. Avoid obsolete parts like ILD6070XUMA1.

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