LM5111-3MX Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5111-3MX is a dual-channel low-side gate driver IC manufactured by Texas Instruments, designed for driving N-Channel MOSFETs in 8-SOIC surface mount packaging. This device operates with independent inverting and non-inverting input channels, delivering peak output currents of 3A (source) and 5A (sink). The LM5111-3MX is classified as "Not For New Designs," indicating end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing production support, design continuity, and component availability assurance.

Key Parameters

Parameter	LM5111-3MX
Manufacturer	Texas Instruments
Driven Configuration	Low-Side
Number of Drivers	2
Gate Type	N-Channel MOSFET
Voltage - Supply	4.6V ~ 14V
Logic Voltage - VIL, VIH	0.8V, 2.2V
Current - Peak Output (Source, Sink)	3A, 5A
Input Type	Inverting, Non-Inverting
Rise / Fall Time (Typ)	14ns, 12ns
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the LM5111-3MX are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Driven Configuration: Low-Side (all substitutes match)
Number of Drivers: 2 independent channels (all substitutes match)
Package / Case: 8-SOIC form factor (all substitutes match)
Mounting Type: Surface Mount (all substitutes match)
Input Type: Inverting, Non-Inverting (all substitutes match)

Secondary compatibility parameters include supply voltage range, peak output current ratings, logic voltage thresholds, and operating temperature range. Substitutes are classified into two categories:

Direct Equivalent: LM5111-3MX/NOPB maintains identical electrical specifications and differs only in packaging format (Bulk vs. Tape & Reel).

Functional Equivalents: MCP1405 series, MIC4125 series, MIC4128 series, MIC4425 series, and TC1428COA provide low-side gate driving functionality with compatible 8-SOIC packaging. These parts operate within overlapping or extended supply voltage ranges and maintain dual independent channels with inverting/non-inverting inputs.

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Peak Output (Source, Sink)	Rise / Fall Time (Typ)	Operating Temp	Package	Product Status	RoHS Status
LM5111-3MX	Texas Instruments	4.6V ~ 14V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Not For New Designs	Non-compliant
LM5111-3MX/NOPB	National Semiconductor	4.6V ~ 14V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Active	Not specified
MCP1405-E/SN	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	15ns, 18ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
MCP1405T-E/SN	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	15ns, 18ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
MIC4125YME	Microchip Technology	4.5V ~ 20V	3A, 3A	11ns, 11ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4125YME-TR	Microchip Technology	4.5V ~ 20V	3A, 3A	11ns, 11ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4128YME	Microchip Technology	4.5V ~ 20V	1.5A, 1.5A	20ns, 18ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4128YME-TR	Microchip Technology	4.5V ~ 20V	1.5A, 1.5A	20ns, 18ns	-40°C ~ 125°C	8-SOIC-EP	Active	ROHS3 Compliant
MIC4425YM	Microchip Technology	4.5V ~ 18V	3A, 3A	28ns, 32ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
MIC4425YM-TR	Microchip Technology	4.5V ~ 18V	3A, 3A	28ns, 32ns	-40°C ~ 150°C	8-SOIC	Active	ROHS3 Compliant
TC1428COA	Microchip Technology	4.5V ~ 16V	1.2A, 1.2A	35ns, 25ns	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

LM5111-3MX/NOPB is the direct equivalent and primary substitute. It maintains identical electrical specifications and 8-SOIC packaging. The part is Active status, providing long-term availability. Selection of this part requires no design modifications.

MCP1405-E/SN and MCP1405T-E/SN are functionally compatible substitutes offering extended supply voltage range (4.5V ~ 18V vs. 4.6V ~ 14V), higher peak output current (4.5A symmetric vs. 3A/5A asymmetric), and extended operating temperature to 150°C. Both are ROHS3 compliant and Active status. The -E/SN variant is packaged in Tube; the -T variant is Tape & Reel. These parts are suitable for applications requiring higher current capability or extended temperature operation.

MIC4125YME and MIC4125YME-TR provide faster switching performance (11ns rise/fall vs. 14ns/12ns) with extended supply voltage to 20V. Output current is symmetric at 3A. The package includes an exposed pad (8-SOIC-EP). Both are ROHS3 compliant and Active. The -TR variant is Tape & Reel packaged.

MIC4128YME and MIC4128YME-TR are suitable only for applications with lower current requirements (1.5A symmetric output). These parts offer extended supply voltage to 20V and are ROHS3 compliant. Selection requires verification that 1.5A peak output current is sufficient for the application.

MIC4425YM and MIC4425YM-TR provide symmetric 3A output current with extended operating temperature to 150°C. Switching performance is slower (28ns/32ns). Both are ROHS3 compliant and Active. The -TR variant is Tape & Reel packaged.

TC1428COA is suitable only for applications operating within 0°C ~ 70°C temperature range and requiring 1.2A peak output current. This part has the most restrictive operating temperature specification and lowest current capability.

All substitute parts maintain dual independent channels with inverting and non-inverting inputs, low-side gate driving configuration, and 8-SOIC form factor compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM5111-3MX/NOPB be used as a direct replacement for LM5111-3MX?

A: Yes. LM5111-3MX/NOPB is electrically and functionally identical. The difference is packaging format: LM5111-3MX is Tape & Reel; LM5111-3MX/NOPB is Bulk. No design changes are required.

Q: What is the primary difference between MCP1405 and MIC4125 substitutes?

A: MCP1405 series offers higher peak output current (4.5A symmetric) and extended supply voltage to 18V. MIC4125 series provides faster switching (11ns vs. 15ns/18ns) and extended supply voltage to 20V, but with symmetric 3A output. MCP1405 supports IGBT, N-Channel, and P-Channel MOSFETs; MIC4125 supports N-Channel and P-Channel MOSFETs only.

Q: Are all substitute parts RoHS compliant?

A: LM5111-3MX is RoHS non-compliant. LM5111-3MX/NOPB compliance status is not specified. All Microchip Technology substitutes (MCP1405, MIC4125, MIC4128, MIC4425, TC1428) are ROHS3 compliant.

Q: Can MIC4128 be used in high-current applications?

A: No. MIC4128 is rated for 1.5A peak output current, significantly lower than LM5111-3MX (3A/5A). Use only in applications where 1.5A output current is sufficient.

Q: What is the operating temperature range difference between substitutes?

A: LM5111-3MX operates -40°C ~ 125°C. MCP1405 and MIC4425 extend to 150°C. MIC4125 and MIC4128 operate -40°C ~ 125°C. TC1428COA is restricted to 0°C ~ 70°C and is unsuitable for extended temperature applications.

Q: Do all substitutes use the same 8-SOIC package?

A: All substitutes use 8-SOIC form factor. MIC4125 and MIC4128 variants include an exposed pad (8-SOIC-EP), providing improved thermal performance. Standard 8-SOIC and 8-SOIC-EP are mechanically compatible in most PCB layouts, though thermal performance differs.

Q: Which substitute offers the best switching performance?

A: MIC4125YME and MIC4125YME-TR provide the fastest switching: 11ns rise and fall time, compared to LM5111-3MX at 14ns/12ns.

Q: Can TC1428COA be used in industrial temperature applications?

A: No. TC1428COA operates only 0°C ~ 70°C, making it unsuitable for industrial (-40°C ~ 125°C) or extended temperature applications. Use MCP1405, MIC4125, MIC4128, or MIC4425 for industrial temperature ranges.

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