LM5111-2MX Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5111-2MX is a low-side gate driver IC manufactured by Texas Instruments, designed for driving N-Channel MOSFETs in power management applications. This device features inverting logic configuration with dual independent channels in an 8-SOIC package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across supply voltage ranges, logic thresholds, output current capabilities, and thermal operating ranges while meeting the same 8-SOIC package footprint.

Substiute Parts

LM5111-2MX

Texas InstrumentsIn Stock: 701LM5111-2MX Datasheet

Current PartRFQ

IR4426SPBF

Infineon TechnologiesIn Stock: 2605IR4426SPBF Datasheet

MFR RecommendedRFQ

IR4426STRPBF

Infineon TechnologiesIn Stock: 20720IR4426STRPBF Datasheet

MFR RecommendedRFQ

IRS4426STRPBF

Infineon TechnologiesIn Stock: 20222IRS4426STRPBF Datasheet

MFR RecommendedRFQ

MCP1403-E/SN

Microchip TechnologyIn Stock: 1488MCP1403-E/SN Datasheet

MFR RecommendedRFQ

MIC4123YME

Microchip TechnologyIn Stock: 7996MIC4123YME Datasheet

MFR RecommendedRFQ

MIC4423YM

Microchip TechnologyIn Stock: 1498MIC4423YM Datasheet

MFR RecommendedRFQ

MIC4423YM-TR

Microchip TechnologyIn Stock: 4892MIC4423YM-TR Datasheet

MFR RecommendedRFQ

TC4426ACOA

Microchip TechnologyIn Stock: 1287TC4426ACOA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5111-2MX is determined by the following critical parameters:

• Package Compatibility: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility
• Functional Configuration: Low-side gate driver with independent dual channels and inverting logic input type
• Supply Voltage Range: Substitute must support the LM5111-2MX operating range of 4.6V ~ 14V minimum
• Logic Voltage Thresholds: VIL and VIH must be compatible with 0.8V and 2.2V specifications
• Output Current Capability: Peak source and sink currents must meet or exceed 3A source and 5A sink requirements
• Gate Type Support: Must support N-Channel MOSFET gate driving at minimum
• Operating Temperature Range: Must support -40°C ~ 125°C junction temperature range

The identified substitute parts meet these criteria with varying levels of parameter overlap. Parts with active product status and RoHS3 compliance provide additional advantages for new designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Parameter Coverage)

IR4426STRPBF and IRS4426STRPBF are recommended as primary substitutes. Both are manufactured by Infineon Technologies with active product status and ROHS3 compliance. IR4426STRPBF provides the closest electrical match with 2.3A source and 3.3A sink output current, supporting the extended supply voltage range of 6V ~ 20V. IRS4426STRPBF offers identical electrical specifications with slightly extended rise/fall times (25ns vs. 15ns). Both parts are available in Cut Tape and Digi-Reel packaging with substantial inventory levels (20,623 and 20,200 units respectively).

Secondary Substitutes (Active Status, Partial Parameter Coverage)

MCP1403-E/SN (Microchip Technology) provides superior output current capability at 4.5A source and sink, exceeding LM5111-2MX specifications. Supply voltage range of 4.5V ~ 18V covers the original operating window. Active product status and ROHS3 compliance support long-term availability. MIC4123YME offers the fastest rise/fall times (11ns) among all substitutes with 3A symmetric output current and extended supply range to 20V. MIC4423YM and MIC4423YM-TR (Microchip Technology) provide identical electrical specifications with active product status and unlimited moisture sensitivity rating (MSL 1).

Limited Substitutes (Restricted Operating Range)

TC4426ACOA is suitable only for applications operating within 0°C ~ 70°C ambient temperature range, as it does not support the full -40°C ~ 125°C junction temperature specification of the original part. Output current capability is limited to 1.5A source and sink, making it unsuitable for high-current gate driving applications.

IR4426SPBF maintains obsolete product status identical to the original part, limiting its suitability for new designs despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM5111-2MX with any of these substitute parts?

A: Direct replacement requires verification of three critical factors: supply voltage range compatibility with your circuit design, output current requirements for your specific MOSFET gate load, and operating temperature range of your application. All substitutes maintain the 8-SOIC package footprint and inverting logic configuration. However, some substitutes have restricted supply voltage minimums (6V for IR4426 series) or temperature ranges (TC4426ACOA limited to 0°C ~ 70°C).

Q: Which substitute offers the best long-term availability?

A: IR4426STRPBF and IRS4426STRPBF are recommended for long-term designs. Both are manufactured by Infineon Technologies with active product status, ROHS3 compliance, and substantial inventory levels exceeding 20,000 units. These parts are available in standard Cut Tape and Digi-Reel packaging formats suitable for production environments.

Q: What is the difference between IR4426SPBF and IR4426STRPBF?

A: Both parts are manufactured by Infineon Technologies with identical electrical specifications (2.3A source, 3.3A sink output current; 6V ~ 20V supply range). The primary difference is packaging: IR4426SPBF is supplied in Tube packaging with obsolete product status, while IR4426STRPBF is supplied in Cut Tape and Digi-Reel format with active product status. IR4426STRPBF is the preferred choice for new designs.

Q: Can I use TC4426ACOA in a -40°C application?

A: No. TC4426ACOA is rated for 0°C ~ 70°C ambient temperature operation only and does not support the -40°C ~ 125°C junction temperature range of the original LM5111-2MX. This part is unsuitable for applications requiring extended low-temperature operation.

Q: Which substitute has the highest output current capability?

A: MCP1403-E/SN provides the highest symmetric output current at 4.5A source and 4.5A sink, exceeding the original part's 3A source and 5A sink specification. This part is manufactured by Microchip Technology with active product status and ROHS3 compliance.

Q: Are all substitutes RoHS compliant?

A: The original LM5111-2MX is RoHS non-compliant. All identified substitutes are ROHS3 compliant, making them suitable for applications requiring RoHS certification. This represents an improvement over the original part for regulatory compliance.

Q: What is the difference between MIC4123YME and MIC4423YM?

A: MIC4123YME features an exposed pad (8-SOIC-EP package variant) with the fastest rise/fall times (11ns) and extended supply range to 20V. MIC4423YM uses standard 8-SOIC packaging with slower rise/fall times (28ns/32ns) but identical 3A symmetric output current. Both are manufactured by Microchip Technology with active product status. MIC4123YME is preferred for high-speed switching applications requiring thermal management through the exposed pad.

Q: Can I use these substitutes interchangeably in my design?

A: Interchangeability depends on your specific circuit requirements. All substitutes maintain the same functional configuration (low-side, dual independent channels, inverting logic, 8-SOIC package). However, verify supply voltage range compatibility, output current requirements for your gate load, and operating temperature specifications before selecting a substitute. Logic voltage thresholds vary slightly across parts (VIH ranges from 2.2V to 2.7V), which may affect timing in marginal logic level applications.