LM5111-1MX Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5111-1MX is a low-side gate driver IC manufactured by Texas Instruments, designed for driving N-channel MOSFETs in power management applications. This device features non-inverting logic, dual independent channels, and operates across a 4.6V to 14V supply range with peak output currents of 3A (source) and 5A (sink).

The LM5111-1MX is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements. Direct replacements and functionally compatible alternatives are available from multiple manufacturers.

Key Parameters

Parameter	LM5111-1MX
Manufacturer	Texas Instruments
Driven Configuration	Low-Side
Number of Drivers	2
Gate Type	N-Channel MOSFET
Input Type	Non-Inverting
Voltage - Supply	4.6V ~ 14V
Logic Voltage - VIL, VIH	0.8V, 2.2V
Current - Peak Output (Source, Sink)	3A, 5A
Rise / Fall Time (Typ)	14ns, 12ns
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM5111-1MX are classified based on the following substitution criteria:

Primary Substitution Parameters:

Driven Configuration: Low-Side
Number of Drivers: 2
Input Type: Non-Inverting
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Gate Type: N-Channel MOSFET compatible
Operating Temperature Range: Minimum -40°C to 125°C

Acceptable Parameter Variations:

Supply Voltage Range: Substitute parts may exceed the 4.6V ~ 14V range (higher ranges are acceptable)
Peak Output Current: Substitute parts may equal or exceed 3A source / 5A sink specifications
Rise / Fall Time: Substitute parts may have faster or comparable switching characteristics
Logic Voltage Thresholds: Minor variations within standard CMOS/TTL logic levels are acceptable
RoHS Compliance: Active substitutes are ROHS3 compliant (improvement over non-compliant original)

Excluded from Substitution:

Inverting input logic (LM5111-2MX excluded due to functional difference)
Different package types or pin configurations
Single-channel drivers

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Peak Output (Source, Sink)	Rise / Fall Time (Typ)	Operating Temp	Package	Product Status	RoHS Status
LM5111-1MX	Texas Instruments	4.6V ~ 14V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Obsolete	RoHS non-compliant
LM5111-1MX/NOPB	Texas Instruments	4.6V ~ 14V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
ADP3654ARDZ-RL	Analog Devices Inc.	4.5V ~ 18V	4A, 4A	10ns, 10ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MCP1404-E/SN	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	15ns, 18ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
MIC4124YME	Microchip Technology	4.5V ~ 20V	3A, 3A	11ns, 11ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4127YME	Microchip Technology	4.5V ~ 20V	1.5A, 1.5A	20ns, 18ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4424YM	Microchip Technology	4.5V ~ 18V	3A, 3A	28ns, 32ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
MIC4424YM-TR	Microchip Technology	4.5V ~ 18V	3A, 3A	28ns, 32ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
TC4424AVOA	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	12ns, 12ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
TC4427ACOA	Microchip Technology	4.5V ~ 18V	1.5A, 1.5A	25ns, 25ns	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LM5111-1MX/NOPB is the direct equivalent with identical electrical specifications and pinout. This part is active and ROHS3 compliant, addressing the obsolescence and compliance status of the original LM5111-1MX.

Primary Substitutes (Full Parameter Compatibility):

TC4424AVOA: Matches or exceeds all critical parameters (4.5A source/sink, 12ns switching), extended temperature range to 150°C, active status
MCP1404-E/SN: Exceeds output current specifications (4.5A), supports extended temperature range to 150°C, active status
ADP3654ARDZ-RL: Faster switching performance (10ns), higher supply voltage range (4.5V ~ 18V), exposed pad variant for thermal management

Secondary Substitutes (Acceptable with Design Verification):

MIC4124YME: Matches output current (3A), faster switching (11ns), higher supply voltage range, exposed pad package
MIC4424YM / MIC4424YM-TR: Identical output current (3A), extended temperature range to 150°C, higher supply voltage range; slower switching (28ns/32ns) requires timing verification

Limited Substitutes (Application-Specific Only):

MIC4127YME: Reduced output current (1.5A) suitable only for low-power applications; faster switching (20ns/18ns)
TC4427ACOA: Reduced output current (1.5A), narrower operating temperature range (0°C ~ 70°C); suitable only for commercial-grade applications

All substitute parts maintain 8-SOIC package compatibility, non-inverting logic, dual independent channels, and N-channel MOSFET gate drive capability. All active substitutes are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can LM5111-1MX/NOPB be used as a direct replacement for LM5111-1MX? A: Yes. LM5111-1MX/NOPB is the active equivalent with identical electrical specifications, pinout, and package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the key difference between LM5111-1MX and LM5111-2MX? A: The LM5111-2MX uses inverting logic, while LM5111-1MX uses non-inverting logic. These are not interchangeable without circuit redesign. LM5111-2MX is excluded from this substitution list.

Q: Are exposed pad (EP) package variants compatible with standard 8-SOIC footprints? A: Exposed pad variants (ADP3654ARDZ-RL, MIC4124YME, MIC4127YME) are mechanically compatible with standard 8-SOIC footprints. The exposed pad provides additional thermal dissipation and should be connected to ground for optimal performance.

Q: Which substitute offers the fastest switching performance? A: ADP3654ARDZ-RL provides the fastest switching characteristics at 10ns rise and fall times, compared to 14ns/12ns for the original LM5111-1MX.

Q: Can TC4427ACOA be used in high-temperature applications? A: No. TC4427ACOA operates only from 0°C to 70°C (commercial grade), making it unsuitable for the -40°C to 125°C industrial temperature range of the original LM5111-1MX. Use TC4424AVOA or MCP1404-E/SN for full temperature range coverage.

Q: What is the impact of using a substitute with lower peak output current? A: Substitutes with lower peak output current (MIC4127YME and TC4427ACOA at 1.5A) are suitable only for applications with reduced gate charge requirements. Verify gate charge (Qg) and switching frequency to ensure adequate drive capability.

Q: Are all substitute parts available in the same packaging options? A: No. Some substitutes are available in Tape & Reel (TR) or Cut Tape (CT) packaging, while others are supplied in Tube packaging. Verify packaging availability with your supplier for production requirements.

Q: Which substitute provides the best thermal performance? A: ADP3654ARDZ-RL and MIC4124YME feature exposed pad (EP) packages that provide superior thermal dissipation compared to standard 8-SOIC packages, reducing junction temperature in high-frequency applications.

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