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LM3402MMX LED Driver IC Equivalent & Substitute Parts
Part Overview
The LM3402MMX 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. The device operates at 500mA output current with a 1MHz switching frequency, supporting input voltage ranges from 6V to 42V. The main part is classified as obsolete product status, which necessitates identification of active equivalent and substitute components for ongoing design requirements and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM3402MMX |
| Product Category | Power Management (PMIC) |
| 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 |
| Switching Frequency | 1MHz |
| Dimming Control | PWM |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Supplier Device Package | 8-VSSOP |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Applications | Lighting |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM3402MMX is determined by the following critical parameters: DC-DC regulator topology (step-down buck), single output configuration, input voltage range (6V to 42V minimum), output current capability (500mA), PWM dimming control, 1MHz switching frequency, and surface mount packaging in 8-pin form factor. Equivalent parts must maintain these core electrical and mechanical specifications to ensure functional compatibility within lighting applications.
The substitute parts are grouped into three categories based on parametric alignment:
Direct Equivalents (Texas Instruments LM3402 Series): Parts LM3402MMX/NOPB and LM3402MM/NOPB maintain identical electrical specifications and differ only in product status (active vs. obsolete) and packaging format (tube vs. tape & reel). These provide pin-for-pin compatibility with identical performance characteristics.
Parametric Equivalents (Upgraded Current Capability): Parts LT3474IFE#TRPBF and LT3474IFE-1#PBF from Analog Devices provide 1A output current (double the original 500mA), operate within compatible voltage ranges (4.6V to 36V), and support PWM dimming with automotive-grade qualification. These accommodate higher current demands while maintaining functional compatibility.
Parametric Equivalents (Enhanced Integration): Parts LT3932EUFD#TRPBF and LT3932IUFD#PBF provide 2A output current with analog and PWM dimming support, operating within 3.6V to 36V input range. These offer increased power handling for advanced lighting applications.
Specialized Alternatives: Parts A6216KLPTR-T (Allegro MicroSystems, 2A, 16-eTSSOP), IS31LT3353-SDLS4-TR (Lumissil Microsystems, 1A, SOT-89-5), and LT3590EDC#TRMPBF (Analog Devices, 80mA, 6-DFN) provide alternative topologies and current ratings for specific application requirements.
Parameter Comparison
| Parameter | LM3402MMX | LM3402MMX/NOPB | LM3402MM/NOPB | LT3474IFE#TRPBF | LT3474IFE-1#PBF | LT3932EUFD#TRPBF | LT3932IUFD#PBF | A6216KLPTR-T | IS31LT3353-SDLS4-TR | LT3590EDC#TRMPBF |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | TI | TI | TI | ADI | ADI | ADI | ADI | Allegro | Lumissil | ADI |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck |
| Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply Min (V) | 6 | 6 | 6 | 4.6 | 4.6 | 3.6 | 3.6 | 4.5 | 6 | 4.5 |
| Voltage Supply Max (V) | 42 | 42 | 42 | 36 | 36 | 36 | 36 | 55 | 40 | 55 |
| Current Output (mA) | 500 | 500 | 500 | 1000 | 1000 | 2000 | 2000 | 2000 | 1000 | 80 |
| Frequency (kHz) | 1000 | 1000 | 1000 | 200-2000 | 200-2000 | 200-2000 | 200-2000 | — | 1000 | 850 |
| Dimming | PWM | PWM | PWM | PWM | PWM | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM | PWM |
| Package | 8-VSSOP | 8-VSSOP | 8-VSSOP | 16-TSSOP-EP | 16-TSSOP-EP | 28-QFN | 28-QFN | 16-eTSSOP-EP | SOT-89-5 | 6-DFN |
| Operating Temp (°C) | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 85 |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | Non-compliant | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 |
| Automotive Grade | — | — | — | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | — | — | — |
Engineering Selection Recommendations
For Direct Pin-Compatible Replacement: Select LM3402MMX/NOPB or LM3402MM/NOPB. Both maintain identical electrical and mechanical specifications to the obsolete LM3402MMX. LM3402MMX/NOPB is available in active product status with ROHS3 compliance and higher inventory (2896 pcs). LM3402MM/NOPB offers the largest available inventory (18031 pcs) in tape & reel packaging format.
For Increased Current Capability (1A): Select LT3474IFE#TRPBF or LT3474IFE-1#PBF from Analog Devices. Both provide double the output current (1A vs. 500mA) while maintaining PWM dimming control and 1MHz switching frequency. These parts carry automotive-grade qualification (AEC-Q100) and ROHS3 compliance. LT3474IFE#TRPBF is supplied in tape & reel format; LT3474IFE-1#PBF is supplied in tube format. Input voltage range is reduced to 4.6V–36V, which is compatible with the original 6V–42V specification for most lighting applications.
For Enhanced Power Handling (2A): Select LT3932EUFD#TRPBF or LT3932IUFD#PBF. Both provide 2A output current with analog and PWM dimming support, automotive-grade qualification, and ROHS3 compliance. Operating temperature range extends to -40°C to 125°C. Input voltage range is 3.6V–36V. LT3932EUFD#TRPBF is supplied in tape & reel format with 4739 pcs inventory; LT3932IUFD#PBF is supplied in tube format with 2182 pcs inventory.
For Specialized Applications: A6216KLPTR-T (Allegro MicroSystems) provides 2A output in 16-eTSSOP package with extended input voltage range (4.5V–55V) and automotive qualification. IS31LT3353-SDLS4-TR (Lumissil Microsystems) provides 1A output in compact SOT-89-5 package with analog and PWM dimming. LT3590EDC#TRMPBF (Analog Devices) provides 80mA output in 6-DFN package for low-power signage applications with extended input voltage range (4.5V–55V).
Frequently Asked Questions (FAQ)
Q: Can LM3402MM/NOPB be used as a direct replacement for LM3402MMX?
A: Yes. LM3402MM/NOPB is a parametric equivalent with identical electrical specifications (6V–42V input, 500mA output, 1MHz frequency, PWM dimming). The primary differences are product status (active vs. obsolete) and packaging format (tape & reel vs. tube). Pin configuration and functional performance are identical.
Q: What is the key difference between LM3402MMX/NOPB and LM3402MM/NOPB?
A: Both parts are electrically identical. LM3402MMX/NOPB is supplied in tube packaging; LM3402MM/NOPB is supplied in tape & reel (TR) packaging. Tape & reel format is standard for high-volume production. Both carry ROHS3 compliance and active product status.
Q: Can LT3474IFE#TRPBF replace LM3402MMX in existing designs?
A: LT3474IFE#TRPBF provides functional compatibility with increased output current (1A vs. 500mA) and PWM dimming control. However, the input voltage range is reduced to 4.6V–36V (vs. 6V–42V), and the package is 16-TSSOP-EP (vs. 8-VSSOP). PCB layout redesign is required. This substitution is suitable for designs that do not require the full 42V input capability.
Q: What is the advantage of LT3932EUFD#TRPBF over LT3474IFE#TRPBF?
A: LT3932EUFD#TRPBF provides double the output current (2A vs. 1A) and supports both analog and PWM dimming (vs. PWM only). The package is 28-QFN (vs. 16-TSSOP-EP), requiring different PCB layout. Both carry automotive-grade qualification and ROHS3 compliance.
Q: Is the LM3402MMX suitable for new designs?
A: No. The LM3402MMX is classified as obsolete product status. For new designs, select from active alternatives: LM3402MMX/NOPB or LM3402MM/NOPB for direct compatibility, or LT3474IFE#TRPBF / LT3932EUFD#TRPBF for enhanced capability. All active alternatives carry ROHS3 compliance.
Q: What packaging considerations apply when substituting with LT3474IFE#TRPBF or LT3932EUFD#TRPBF?
A: LT3474IFE#TRPBF uses 16-TSSOP-EP package (vs. 8-VSSOP for LM3402MMX). LT3932EUFD#TRPBF uses 28-QFN package. Both require PCB redesign due to different pin counts, pin spacing, and thermal pad configurations. Consult device datasheets for pinout and layout requirements.
Q: Are all substitute parts ROHS3 compliant?
A: All active substitute parts listed carry ROHS3 compliance. The original LM3402MMX is RoHS non-compliant. Direct equivalents LM3402MMX/NOPB and LM3402MM/NOPB provide ROHS3 compliance with identical electrical performance.
Q: Which substitute provides the widest input voltage range?
A: A6216KLPTR-T and LT3590EDC#TRMPBF both support 4.5V–55V input range, exceeding the original LM3402MMX specification (6V–42V). A6216KLPTR-T provides 2A output; LT3590EDC#TRMPBF provides 80mA output for lower-power applications.
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