IXDI409SI Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The IXDI409SI is a low-side gate driver IC manufactured by IXYS, designed for driving IGBT, N-Channel, and P-Channel MOSFETs in power management applications. This device operates with a supply voltage range of 4.5V to 35V and delivers 9A peak output current (source and sink). The IXDI409SI is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across electrical specifications, package form factor, and functional performance characteristics.

Key Parameters

Parameter	IXDI409SI
Manufacturer	IXYS
Product Status	Obsolete
Driven Configuration	Low-Side
Channel Type	Single
Gate Type	IGBT, N-Channel, P-Channel MOSFET
Voltage - Supply	4.5V ~ 35V
Logic Voltage - VIL, VIH	0.8V, 4.6V
Current - Peak Output (Source, Sink)	9A, 9A
Input Type	Inverting
Rise / Fall Time (Typ)	10ns, 10ns
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the IXDI409SI are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Supply Voltage Range: Must support the full 4.5V to 35V operating window or a compatible subset
Peak Output Current: Must deliver minimum 9A source and sink capability
Package Form Factor: Must be 8-SOIC surface mount with identical pinout
Input Type: Must maintain inverting logic configuration
Operating Temperature Range: Must support the application's thermal requirements
Gate Type Compatibility: Must drive IGBT and MOSFET devices

Substitute parts are categorized into two groups:

Group 1 - IXYS IXDI609 Series (Active Status): Direct functional replacements with extended supply voltage support (4.5V ~ 35V), identical 9A output current, and improved rise/fall time specifications. Available in multiple packaging options (Tube, Tape & Reel, Cut Tape).

Group 2 - Microchip MIC4429 Series (Active Status): Functional alternatives with reduced supply voltage range (4.5V ~ 18V) and reduced peak output current (6A source/sink). Suitable for applications within the lower voltage envelope.

Group 3 - Texas Instruments UCC37321 Series (Last Time Buy / Active Status): Functional alternatives with restricted supply voltage range (4V ~ 15V) and 9A output current. Limited operating temperature range (0°C ~ 70°C).

Parameter Comparison

Parameter	IXDI409SI	IXDI609SI	IXDI609SIA	IXDI609SIATR	IXDI609SITR	MIC4429YM	MIC4429YM-TR	MIC4429ZM	MIC4429ZM-TR	UCC37321D	UCC37321DR
Manufacturer	IXYS	IXYS	IXYS	IXYS	IXYS	Microchip	Microchip	Microchip	Microchip	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Last Time Buy	Active
Driven Configuration	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side	Low-Side
Channel Type	Single	Single	Single	Single	Single	Single	Single	Single	Single	Single	Single
Gate Type	IGBT, N-Channel, P-Channel MOSFET	IGBT, N-Channel, P-Channel MOSFET	IGBT, N-Channel, P-Channel MOSFET	IGBT, N-Channel, P-Channel MOSFET	IGBT, N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET	N-Channel, P-Channel MOSFET
Voltage - Supply	4.5V ~ 35V	4.5V ~ 35V	4.5V ~ 35V	4.5V ~ 35V	4.5V ~ 35V	4.5V ~ 18V	4.5V ~ 18V	4.5V ~ 18V	4.5V ~ 18V	4V ~ 15V	4V ~ 15V
Logic Voltage - VIL, VIH	0.8V, 4.6V	0.8V, 3V	0.8V, 3V	0.8V, 3V	0.8V, 3V	0.8V, 2.4V	0.8V, 2.4V	0.8V, 2.4V	0.8V, 2.4V	1.1V, 2.7V	1.1V, 2.7V
Current - Peak Output (Source, Sink)	9A, 9A	9A, 9A	9A, 9A	9A, 9A	9A, 9A	6A, 6A	6A, 6A	6A, 6A	6A, 6A	9A, 9A	9A, 9A
Input Type	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting	Inverting
Rise / Fall Time (Typ)	10ns, 10ns	22ns, 15ns	22ns, 15ns	22ns, 15ns	22ns, 15ns	12ns, 13ns	12ns, 13ns	12ns, 13ns	12ns, 13ns	20ns, 20ns	20ns, 20ns
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	0°C ~ 150°C (TJ)	0°C ~ 150°C (TJ)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

IXYS IXDI609 Series (IXDI609SI, IXDI609SIA, IXDI609SIATR, IXDI609SITR)

The IXDI609 series represents the primary substitute for the obsolete IXDI409SI. All variants maintain identical electrical specifications: 4.5V to 35V supply voltage range, 9A peak output current, and -55°C to 150°C operating temperature range. These parts are in active production status with ROHS3 compliance. The IXDI609 series is available in multiple packaging configurations (Tube, Tape & Reel, Cut Tape) to accommodate different procurement and assembly requirements. Selection among IXDI609 variants depends on packaging preference and inventory availability.

Microchip MIC4429 Series (MIC4429YM, MIC4429YM-TR, MIC4429ZM, MIC4429ZM-TR)

The MIC4429 series provides functional substitution for applications operating within reduced voltage and current envelopes. These parts are limited to 4.5V to 18V supply voltage and 6A peak output current. The MIC4429 series is suitable only for designs that do not require the full 35V supply voltage capability or 9A output current of the IXDI409SI. All MIC4429 variants are in active production with ROHS3 compliance. Temperature range varies: MIC4429YM variants support -40°C to 150°C, while MIC4429ZM variants support 0°C to 150°C.

Texas Instruments UCC37321 Series (UCC37321D, UCC37321DR)

The UCC37321 series offers substitution with significant operational constraints. Supply voltage is limited to 4V to 15V, and operating temperature is restricted to 0°C to 70°C. The UCC37321D is classified as Last Time Buy, indicating limited future availability. The UCC37321DR is in active production status. Both variants maintain 9A peak output current and ROHS3 compliance. This series is suitable only for applications with narrow voltage and temperature operating windows.

Frequently Asked Questions (FAQ)

Q: Can the IXDI609SI directly replace the IXDI409SI without circuit modifications?

A: Yes, the IXDI609SI is a direct functional replacement. Both parts share identical electrical specifications (4.5V ~ 35V supply, 9A output current, -55°C ~ 150°C operating range) and 8-SOIC package form factor. The IXDI609SI is in active production, making it the recommended substitute for the obsolete IXDI409SI.

Q: What are the key differences between IXDI609 package variants?

A: All IXDI609 variants (SI, SIA, SIATR, SITR) maintain identical electrical performance. Differences are packaging-related: IXDI609SI and IXDI609SITR feature exposed pad packages (8-SOIC-EP), while IXDI609SIA and IXDI609SIATR use standard 8-SOIC packages. Packaging options (Tube, Tape & Reel, Cut Tape) accommodate different manufacturing and procurement workflows.

Q: Can MIC4429 parts substitute for IXDI409SI in all applications?

A: No. MIC4429 parts are limited to 4.5V ~ 18V supply voltage and 6A peak output current, compared to IXDI409SI specifications of 4.5V ~ 35V and 9A. MIC4429 substitution is valid only for applications operating within these reduced electrical envelopes. Applications requiring full 35V supply voltage or 9A output current must use IXDI609 or UCC37321 alternatives.

Q: What is the operating temperature difference between MIC4429YM and MIC4429ZM?

A: MIC4429YM supports -40°C to 150°C operating temperature range, while MIC4429ZM supports 0°C to 150°C. Selection depends on the application's minimum operating temperature requirement. Both variants are electrically identical in all other parameters.

Q: Why is UCC37321 marked as Last Time Buy?

A: The UCC37321D is classified as Last Time Buy by Texas Instruments, indicating the manufacturer is discontinuing this product. While UCC37321DR remains in active production, future availability of UCC37321D may be limited. For new designs, IXDI609 series is the preferred substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (IXDI609 series, MIC4429 series, UCC37321 series) are ROHS3 compliant. The original IXDI409SI does not specify RoHS status.

Q: What is the significance of the exposed pad (EP) in IXDI609SI and IXDI609SITR?

A: The exposed pad provides enhanced thermal dissipation by connecting to a ground plane on the PCB. This improves heat transfer during high-current operation. Standard 8-SOIC packages (IXDI609SIA, IXDI609SIATR) without exposed pads are suitable for applications with lower thermal requirements.

Q: Can I use UCC37321 in place of IXDI409SI for high-temperature applications?

A: No. UCC37321 is limited to 0°C ~ 70°C operating temperature, significantly below the IXDI409SI range of -55°C ~ 150°C. For applications requiring extended temperature operation, use IXDI609 series, which maintains the full -55°C ~ 150°C range.

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