LM5111-2M/NOPB Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5111-2M/NOPB is a low-side gate driver IC manufactured by Texas Instruments, designed for inverting N-channel MOSFET applications in power management circuits. This device operates with a supply voltage range of 4.6V to 14V and delivers peak output currents of 3A (source) and 5A (sink). The part is currently in Last Time Buy status, indicating production discontinuation. Identifying qualified substitute parts ensures design continuity and supply chain reliability for applications requiring low-side gate driving functionality.

Key Parameters

Parameter	LM5111-2M/NOPB
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
Rise / Fall Time (Typ)	14ns, 12ns
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM5111-2M/NOPB are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Driven Configuration: Low-Side
Number of Drivers: 2
Input Type: Inverting
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Gate Type: N-Channel MOSFET (minimum requirement)

Allowable Parameter Variations:

Supply Voltage Range: Substitute must encompass or exceed the 4.6V ~ 14V range
Peak Output Current: Substitute source and sink currents must meet or exceed 3A and 5A respectively
Logic Voltage Thresholds: VIL and VIH must be compatible with standard logic signal levels
Operating Temperature: Must support -40°C ~ 125°C minimum
Rise / Fall Time: Faster or equivalent switching characteristics are acceptable
RoHS and MSL Compliance: Must maintain ROHS3 compliance and MSL rating of 1 or 2

Substitutes are grouped by manufacturer and product status to facilitate selection based on availability and lifecycle requirements.

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Peak Output (Source, Sink)	Logic VIL, VIH	Rise / Fall Time (Typ)	Operating Temp	Product Status	Packaging
LM5111-2M/NOPB	Texas Instruments	4.6V ~ 14V	3A, 5A	0.8V, 2.2V	14ns, 12ns	-40°C ~ 125°C	Last Time Buy	Tube
LM5111-2MX/NOPB	Texas Instruments	4.6V ~ 14V	3A, 5A	0.8V, 2.2V	14ns, 12ns	-40°C ~ 125°C	Active	Tape & Reel (TR)
IR4426SPBF	Infineon Technologies	6V ~ 20V	2.3A, 3.3A	0.8V, 2.7V	15ns, 10ns	-40°C ~ 150°C	Obsolete	Tube
IR4426STRPBF	Infineon Technologies	6V ~ 20V	2.3A, 3.3A	0.8V, 2.7V	15ns, 10ns	-40°C ~ 150°C	Active	Cut Tape (CT) & Digi-Reel®
IRS4426STRPBF	Infineon Technologies	6V ~ 20V	2.3A, 3.3A	0.8V, 2.5V	25ns, 25ns	-40°C ~ 150°C	Active	Cut Tape (CT) & Digi-Reel®
MCP1403-E/SN	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	0.8V, 2.4V	15ns, 18ns	-40°C ~ 150°C	Active	Tube
MCP1403T-E/SN	Microchip Technology	4.5V ~ 18V	4.5A, 4.5A	0.8V, 2.4V	15ns, 18ns	-40°C ~ 150°C	Active	Tape & Reel (TR)
MIC4123YME	Microchip Technology	4.5V ~ 20V	3A, 3A	0.8V, 2.4V	11ns, 11ns	-40°C ~ 125°C	Active	Tube
MIC4123YME-TR	Microchip Technology	4.5V ~ 20V	3A, 3A	0.8V, 2.4V	11ns, 11ns	-40°C ~ 125°C	Active	Cut Tape (CT) & Digi-Reel®
MIC4126YME	Microchip Technology	4.5V ~ 20V	1.5A, 1.5A	0.8V, 2.4V	20ns, 18ns	-40°C ~ 125°C	Active	Tube
MIC4126YME-TR	Microchip Technology	4.5V ~ 20V	1.5A, 1.5A	0.8V, 2.4V	20ns, 18ns	-40°C ~ 125°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): LM5111-2MX/NOPB is the primary substitute. This part maintains identical electrical specifications and operating temperature range as the original LM5111-2M/NOPB. The only difference is packaging format (Tape & Reel versus Tube), which does not affect functional performance. Product status is Active, ensuring long-term availability. Both parts are ROHS3 compliant with MSL rating of 1.

Tier 2 - Functional Equivalents (Active Status): MIC4123YME and MIC4123YME-TR (Microchip Technology) provide equivalent peak output current (3A source, 3A sink) and operating temperature range (-40°C ~ 125°C). Supply voltage range is expanded (4.5V ~ 20V), and switching characteristics are faster (11ns rise/fall time). These parts are Active status with ROHS3 compliance.

MCP1403-E/SN and MCP1403T-E/SN (Microchip Technology) exceed output current specifications (4.5A source and sink) and support extended operating temperature (-40°C ~ 150°C). Supply voltage range is 4.5V ~ 18V. These parts are Active status with ROHS3 compliance.

Tier 3 - Conditional Substitutes (Obsolete or Current Limitations): IR4426STRPBF (Infineon Technologies) is Active status but has reduced peak output current (2.3A source, 3.3A sink), which falls below the original 3A source specification. Supply voltage range is 6V ~ 20V. Use only if application current requirements are confirmed below 2.3A source.

IR4426SPBF (Infineon Technologies) is Obsolete status and should not be selected for new designs.

IRS4426STRPBF (Infineon Technologies) has significantly slower switching characteristics (25ns rise/fall time) compared to the original (14ns/12ns). Use only if application timing requirements permit slower switching.

MIC4126YME and MIC4126YME-TR (Microchip Technology) have reduced peak output current (1.5A source and sink), which does not meet the original 5A sink specification. These parts are suitable only for applications with lower current requirements.

Frequently Asked Questions (FAQ)

Q: Can LM5111-2MX/NOPB be used as a direct replacement for LM5111-2M/NOPB? A: Yes. Both parts have identical electrical specifications, operating temperature range, and package dimensions. The difference is packaging format (Tape & Reel versus Tube). Functional performance is equivalent.

Q: What is the key difference between Microchip MIC4123 and MIC4126 gate drivers? A: The MIC4123 series delivers 3A peak output current (source and sink), while the MIC4126 series delivers 1.5A. Select MIC4123 for applications requiring higher output current. Both support the same supply voltage range (4.5V ~ 20V) and operating temperature (-40°C ~ 125°C).

Q: Why do Infineon IR4426 parts have lower peak output current than the original LM5111-2M/NOPB? A: The IR4426 series is specified with 2.3A source and 3.3A sink current, compared to the LM5111-2M/NOPB specification of 3A source and 5A sink. Applications requiring the full 3A source or 5A sink current should not use IR4426 parts unless current requirements are confirmed lower.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance, consistent with the original LM5111-2M/NOPB.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings? A: MSL indicates the maximum time a component can be exposed to moisture before soldering. The original LM5111-2M/NOPB has MSL 1 (Unlimited). Most substitutes have MSL 1 or 2. MSL 3 parts (MIC4123YME-TR, MIC4126YME-TR) require storage in dry conditions and have a 168-hour shelf life limit after opening.

Q: Can IR4426SPBF be used in new designs? A: No. IR4426SPBF is Obsolete status and should not be selected for new designs. Use IR4426STRPBF (Active status) if an Infineon solution is required.

Q: What packaging options are available for substitute parts? A: Substitutes are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® formats. All maintain the same 8-SOIC package dimensions (0.154", 3.90mm Width). Select packaging based on production volume and assembly requirements.

Q: How do switching characteristics (rise/fall time) affect gate driver selection? A: Faster switching characteristics (lower rise/fall time) reduce switching losses and improve efficiency. The original LM5111-2M/NOPB has 14ns rise and 12ns fall time. MIC4123 parts offer faster switching (11ns), while IRS4426STRPBF has slower switching (25ns). Select based on application timing and efficiency requirements.

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