IR4426S Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The IR4426S is a low-side gate driver IC manufactured by Infineon Technologies, designed for driving IGBT and N-Channel MOSFET gates in power management applications. This device operates with a supply voltage range of 6V to 20V and features inverting input logic with independent dual-channel configuration in an 8-SOIC package.

The IR4426S is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value
Manufacturer	Infineon Technologies
Part Number	IR4426S
Category	Power Management (PMIC)
Description	IC GATE DRVR LOW-SIDE 8SOIC
Driven Configuration	Low-Side
Number of Drivers	2
Gate Type	IGBT, N-Channel MOSFET
Voltage - Supply	6V ~ 20V
Logic Voltage - VIL, VIH	0.8V, 2.7V
Current - Peak Output (Source, Sink)	2.3A, 3.3A
Input Type	Inverting
Rise / Fall Time (Typ)	15ns, 10ns
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the IR4426S are qualified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Driven Configuration: Low-Side
Number of Drivers: 2
Input Type: Inverting
Package / Case: 8-SOIC form factor
Gate Type: Support for IGBT and/or N-Channel MOSFET
Supply Voltage Range: Must encompass or overlap with 6V ~ 20V
Logic Voltage Levels: VIL and VIH must be compatible with 0.8V and 2.7V thresholds
Peak Output Current: Source and Sink capabilities must meet or exceed application requirements
Operating Temperature Range: Must support -40°C ~ 150°C (TJ) or equivalent

Substitute parts are grouped into two categories:

Category 1: Direct Infineon Equivalents

IR4426SPBF: Identical electrical specifications with RoHS3 compliance and improved packaging (Tube). Moisture Sensitivity Level upgraded to MSL 2.

Category 2: Cross-Manufacturer Alternatives

IXYS IXDI602 series (IXDI602SI, IXDI602SIA, IXDI602SIATR, IXDI602SITR): Extended supply voltage range (4.5V ~ 35V), faster switching times, active product status, RoHS3 compliant. Supports IGBT, N-Channel, and P-Channel MOSFETs.
Texas Instruments LM5111 series (LM5111-2M/NOPB, LM5111-2MX/NOPB): Narrower supply voltage range (3.5V ~ 14V), higher peak output current (3A source, 5A sink), RoHS3 compliant. LM5111-2MX/NOPB is active status.
Analog Devices/Maxim MAX4426 series (MAX4426CSA+, MAX4426CSA+T, MAX4426ESA+): Supply voltage range 4.5V ~ 18V, lower peak output current (1.5A source and sink), RoHS3 compliant, active product status.

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Logic VIL, VIH	Peak Output (Source, Sink)	Rise/Fall Time (Typ)	Operating Temp	Package	Product Status	RoHS Status
IR4426S	Infineon	6V ~ 20V	0.8V, 2.7V	2.3A, 3.3A	15ns, 10ns	-40°C ~ 150°C	8-SOIC	Obsolete	RoHS non-compliant
IR4426SPBF	Infineon	6V ~ 20V	0.8V, 2.7V	2.3A, 3.3A	15ns, 10ns	-40°C ~ 150°C	8-SOIC	Obsolete	RoHS3 Compliant
IXDI602SI	IXYS	4.5V ~ 35V	0.8V, 3V	2A, 2A	7.5ns, 6.5ns	-55°C ~ 150°C	8-SOIC-EP	Active	RoHS3 Compliant
IXDI602SIA	IXYS	4.5V ~ 35V	0.8V, 3V	2A, 2A	7.5ns, 6.5ns	-55°C ~ 150°C	8-SOIC	Active	RoHS3 Compliant
IXDI602SIATR	IXYS	4.5V ~ 35V	0.8V, 3V	2A, 2A	7.5ns, 6.5ns	-55°C ~ 150°C	8-SOIC	Active	RoHS3 Compliant
IXDI602SITR	IXYS	4.5V ~ 35V	0.8V, 3V	2A, 2A	7.5ns, 6.5ns	-55°C ~ 150°C	8-SOIC-EP	Active	RoHS3 Compliant
LM5111-2M/NOPB	Texas Instruments	3.5V ~ 14V	0.8V, 2.2V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Last Time Buy	RoHS3 Compliant
LM5111-2MX/NOPB	Texas Instruments	3.5V ~ 14V	0.8V, 2.2V	3A, 5A	14ns, 12ns	-40°C ~ 125°C	8-SOIC	Active	RoHS3 Compliant
MAX4426CSA+	Analog Devices/Maxim	4.5V ~ 18V	0.8V, 2.4V	1.5A, 1.5A	20ns, 20ns	0°C ~ 70°C	8-SOIC	Active	RoHS3 Compliant
MAX4426CSA+T	Analog Devices/Maxim	4.5V ~ 18V	0.8V, 2.4V	1.5A, 1.5A	20ns, 20ns	0°C ~ 70°C	8-SOIC	Active	RoHS3 Compliant
MAX4426ESA+	Analog Devices/Maxim	4.5V ~ 18V	0.8V, 2.4V	1.5A, 1.5A	20ns, 20ns	-40°C ~ 85°C	8-SOIC	Active	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Minimal Design Impact: IR4426SPBF is the preferred direct substitute. It maintains identical electrical specifications and pinout compatibility with the IR4426S while offering RoHS3 compliance and improved moisture sensitivity rating (MSL 2 vs. MSL 1). This part is suitable for applications where the original 6V ~ 20V supply voltage range and 2.3A/3.3A output current specifications are required.

For New Designs or Applications with Extended Supply Voltage Requirements: The IXYS IXDI602 series (IXDI602SIA or IXDI602SIATR recommended for active status) provides extended supply voltage range (4.5V ~ 35V), faster switching performance (7.5ns/6.5ns rise/fall times), and active product status. These parts support broader gate type compatibility (IGBT, N-Channel, and P-Channel MOSFETs) and extended operating temperature range (-55°C ~ 150°C). Trade-off: Peak output current is reduced to 2A source and sink.

For Applications Requiring Higher Output Current: LM5111-2MX/NOPB (active status) delivers higher peak output current (3A source, 5A sink) compared to the IR4426S. However, the supply voltage range is narrower (3.5V ~ 14V) and maximum operating temperature is limited to 125°C. This part is suitable for applications within the specified voltage and temperature constraints.

For Commercial Temperature Range Applications: MAX4426ESA+ provides active product status and RoHS3 compliance with extended commercial operating temperature range (-40°C ~ 85°C). Supply voltage range is 4.5V ~ 18V. Peak output current is lower (1.5A source and sink), making this suitable for lower-current gate drive applications.

All substitute parts listed maintain the 8-SOIC package form factor and inverting input logic configuration. Selection should be based on specific application requirements for supply voltage range, output current capability, operating temperature, and product lifecycle status.

Frequently Asked Questions (FAQ)

Q: Can IR4426SPBF be used as a direct drop-in replacement for IR4426S? A: Yes. IR4426SPBF is electrically and functionally identical to IR4426S with identical supply voltage range (6V ~ 20V), logic voltage thresholds (0.8V, 2.7V), peak output current (2.3A source, 3.3A sink), and operating temperature range (-40°C ~ 150°C). The primary differences are RoHS3 compliance and improved moisture sensitivity rating. Pin configuration and package footprint are identical.

Q: What are the key differences between IXDI602 variants (SI, SIA, SIATR, SITR)? A: All IXDI602 variants share identical electrical specifications. Differences are in packaging and form factor: IXDI602SI and IXDI602SITR feature exposed pad (8-SOIC-EP) for enhanced thermal performance; IXDI602SIA and IXDI602SIATR use standard 8-SOIC without exposed pad. SIATR and SITR variants are supplied in Cut Tape/Digi-Reel or Tape & Reel format, while SI and SIA are supplied in Tube packaging.

Q: Why does IXDI602 have a wider supply voltage range (4.5V ~ 35V) compared to IR4426S (6V ~ 20V)? A: The IXDI602 is designed for broader application flexibility across multiple power management topologies. The wider voltage range does not affect compatibility with the IR4426S operating range (6V ~ 20V), as this range falls entirely within the IXDI602 specification. Applications operating within 6V ~ 20V will function identically with either device.

Q: Is the LM5111-2MX/NOPB suitable for applications requiring -40°C ~ 150°C operation? A: No. LM5111-2MX/NOPB is rated for -40°C ~ 125°C operating temperature, which does not meet the full -40°C ~ 150°C requirement of the IR4426S. For applications requiring operation above 125°C, use IR4426SPBF, IXDI602 series, or MAX4426ESA+ (limited to -40°C ~ 85°C).

Q: What is the impact of reduced peak output current in IXDI602 (2A source/sink) versus IR4426S (2.3A source/3.3A sink)? A: Peak output current determines gate charge delivery speed and maximum gate capacitance that can be driven. The IXDI602 reduction from 3.3A to 2A sink current may limit applications with very high gate capacitance loads. For applications currently operating within 2A sink current margins, IXDI602 is suitable. Applications requiring the full 3.3A sink current should use IR4426SPBF or LM5111-2MX/NOPB (5A sink).

Q: Are all substitute parts RoHS3 compliant? A: All substitute parts listed are RoHS3 compliant except IR4426S (RoHS non-compliant). IR4426SPBF is the only Infineon option with RoHS3 compliance. For new designs subject to RoHS3 requirements, any substitute part except IR4426S is acceptable.

Q: Can MAX4426 series be used in applications requiring -40°C ~ 150°C operation? A: MAX4426CSA+ and MAX4426CSA+T are rated for 0°C ~ 70°C, which does not meet the requirement. MAX4426ESA+ extends to -40°C ~ 85°C, which still does not cover the full -40°C ~ 150°C range. For full temperature range compatibility, use IR4426SPBF or IXDI602 series.

Q: What is the significance of "Last Time Buy" status for LM5111-2M/NOPB? A: Last Time Buy status indicates Texas Instruments has announced end-of-life for this part. LM5111-2MX/NOPB (active status) is the recommended alternative from the LM5111 family. For new designs, active-status parts (IXDI602 series, LM5111-2MX/NOPB, MAX4426 series) are preferred to ensure long-term supply availability.

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