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

Part Overview

The LM5111-3MY is a low-side gate driver IC manufactured by Texas Instruments, designed for driving N-channel MOSFETs with independent dual-channel configuration. This device features inverting and non-inverting input types and operates across a supply voltage range of 4.6V to 14V. The part is currently classified as obsolete, making identification of functionally equivalent substitutes essential for ongoing design support and production continuity.

Key Parameters

Parameter	LM5111-3MY
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC GATE DRVR LOW-SIDE 8MSOP
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-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM5111-3MY is determined by the following critical parameters:

Driven Configuration: Must be low-side gate driver
Number of Drivers: Must be dual-channel (2 drivers)
Gate Type: Must drive N-channel MOSFETs
Input Type: Must support both inverting and non-inverting configurations
Package / Case: Must be 8-MSOP with exposed pad, maintaining 0.118" (3.00mm) width
Operating Temperature Range: Must support -40°C to 125°C (TJ)
Mounting Type: Must be surface mount

The MIC4128YMME and MIC4128YMME-TR from Microchip Technology meet these core functional and mechanical requirements. Both variants are electrically identical, differing only in packaging format (tube versus tape & reel).

Parameter Comparison

Parameter	LM5111-3MY	MIC4128YMME	MIC4128YMME-TR
Manufacturer	Texas Instruments	Microchip Technology	Microchip Technology
Driven Configuration	Low-Side	Low-Side	Low-Side
Number of Drivers	2	2	2
Gate Type	N-Channel MOSFET	N-Channel MOSFET	N-Channel MOSFET
Voltage - Supply	4.6V ~ 14V	4.5V ~ 20V	4.5V ~ 20V
Logic Voltage - VIL, VIH	0.8V, 2.2V	0.8V, 2.4V	0.8V, 2.4V
Current - Peak Output (Source, Sink)	3A, 5A	1.5A, 1.5A	1.5A, 1.5A
Input Type	Inverting, Non-Inverting	Inverting, Non-Inverting	Inverting, Non-Inverting
Rise / Fall Time (Typ)	14ns, 12ns	20ns, 18ns	20ns, 18ns
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad	8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad	8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The MIC4128YMME and MIC4128YMME-TR are active, production-supported alternatives to the obsolete LM5111-3MY. Both Microchip variants are ROHS3 compliant, addressing regulatory requirements that the original part does not meet. The primary distinction between the two substitute options is packaging format: MIC4128YMME is supplied in tube packaging, while MIC4128YMME-TR is supplied in tape & reel format for automated assembly processes.

Design considerations include the following parameter differences: the MIC4128 series operates at a higher supply voltage range (4.5V ~ 20V versus 4.6V ~ 14V), features slightly higher logic input thresholds (VIH 2.4V versus 2.2V), and delivers lower peak output current (1.5A source/sink versus 3A/5A). Rise and fall times are marginally slower (20ns/18ns versus 14ns/12ns). These differences require circuit-level evaluation to confirm compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the MIC4128YMME directly replace the LM5111-3MY without circuit modifications?

A: Direct pin-compatible replacement is possible due to identical package geometry and pinout. However, the parameter differences in supply voltage range, output current capability, and switching speed require circuit analysis to confirm functional equivalence for the specific application.

Q: What is the difference between MIC4128YMME and MIC4128YMME-TR?

A: Both parts are electrically identical. MIC4128YMME is supplied in tube packaging for manual handling and lower-volume applications. MIC4128YMME-TR is supplied in tape & reel format, optimized for automated pick-and-place assembly in production environments.

Q: Does the higher supply voltage range of the MIC4128 create compatibility issues?

A: The MIC4128 operates from 4.5V to 20V, compared to the LM5111-3MY range of 4.6V to 14V. If the original design operates below 4.5V, the MIC4128 is not suitable. Designs operating within the overlapping range (4.5V ~ 14V) are compatible.

Q: How do the output current differences affect circuit design?

A: The LM5111-3MY provides 3A source and 5A sink current, while the MIC4128 provides 1.5A for both source and sink. Applications requiring the higher current capability of the original part must be re-evaluated. Lower-current gate drive applications remain compatible.

Q: Are there RoHS compliance implications for using the MIC4128 as a substitute?

A: Yes. The LM5111-3MY is RoHS non-compliant, while both MIC4128 variants are ROHS3 compliant. Designs requiring RoHS compliance benefit from this substitution.

Q: What is the moisture sensitivity difference between these parts?

A: The LM5111-3MY has MSL 1 (unlimited shelf life without baking), while the MIC4128 has MSL 3 (168-hour maximum shelf life before baking). The MIC4128 requires moisture control procedures during storage and handling.

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