STSJ100NHS3LL N-Channel 30V 100A MOSFET Equivalent & Substitute Parts

Part Overview

The STSJ100NHS3LL is an N-Channel MOSFET manufactured by STMicroelectronics, designed for high-current switching applications with a 30V drain-to-source voltage rating and 100A continuous drain current capability. This device is part of the STripFET™ III series and features a surface mount 8-SOIC-EP package with exposed pad for enhanced thermal performance.

The STSJ100NHS3LL is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	100	A (Tc)
On-Resistance (Rds On Max) @ 10A, 10V	4.2	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 1mA	2.5	V
Gate Charge (Qg Max) @ 4.5V	35	nC
Maximum Gate Voltage (Vgs Max)	±16	V
Input Capacitance (Ciss Max) @ 25V	4200	pF
Power Dissipation (Max)	3 (Ta), 70 (Tc)	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	8-SOIC-EP	Surface Mount
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	3 (168 Hours)	-

Substitute Part Grouping Explanation

Substitution of the STSJ100NHS3LL is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must maintain the 30V Vdss rating to ensure safe operation within the same voltage domain.

Current Handling Capability: The STSJ100NHS3LL delivers 100A continuous drain current. Substitute parts with lower current ratings (18A to 20A) are classified as partial substitutes suitable only for applications where the full 100A capability is not required.

On-Resistance Characteristics: The Rds On specification at rated conditions determines switching losses and thermal performance. Substitute parts with comparable or lower Rds On values maintain equivalent efficiency.

Package Compatibility: The 8-SOIC form factor is maintained across all substitute options. The exposed pad variant (8-SOIC-EP) of the main part provides superior thermal dissipation compared to standard 8-SOIC packages without exposed pads.

Electrical Specifications: Gate threshold voltage, gate charge, and input capacitance must fall within acceptable ranges to ensure compatible gate drive requirements and switching behavior.

Compliance and Status: RoHS3 compliance and product status (Active vs. Obsolete/Not For New Designs) are critical for supply chain planning and regulatory adherence.

Parameter Comparison

Parameter	STSJ100NHS3LL (Main)	AO4430	FDS8870	IRF7832TRPBF	Unit
Manufacturer	STMicroelectronics	Alpha & Omega Semiconductor Inc.	onsemi	Infineon Technologies	-
Drain-to-Source Voltage (Vdss)	30	30	30	30	V
Continuous Drain Current (Id) @ 25°C	100 (Tc)	18 (Ta)	18 (Ta)	20 (Ta)	A
On-Resistance (Rds On Max) @ Rated Conditions	4.2 @ 10A, 10V	5.5 @ 18A, 10V	4.2 @ 18A, 10V	4.0 @ 20A, 10V	mOhm
Gate Threshold Voltage (Vgs(th) Max)	2.5 @ 1mA	2.5 @ 250µA	2.5 @ 250µA	2.32 @ 250µA	V
Gate Charge (Qg Max)	35 @ 4.5V	124 @ 10V	112 @ 10V	51 @ 4.5V	nC
Maximum Gate Voltage (Vgs Max)	±16	±20	±20	±20	V
Input Capacitance (Ciss Max)	4200 @ 25V	7270 @ 15V	4615 @ 15V	4310 @ 15V	pF
Power Dissipation (Max)	3 (Ta), 70 (Tc)	3 (Ta)	2.5 (Ta)	2.5 (Ta)	W
Operating Temperature Range	-55 to 150	-55 to 150	-55 to 150	-55 to 155	°C (TJ)
Package Type	8-SOIC-EP	8-SOIC	8-SOIC	8-SO	-
Product Status	Obsolete	Not For New Designs	Active	Active	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-

Engineering Selection Recommendations

For Direct Replacement (100A Current Requirement):

No direct equivalent substitute exists among the provided parts. The STSJ100NHS3LL is the only device in this comparison set rated for 100A continuous drain current. Applications requiring the full 100A capability cannot be substituted with the lower-rated alternatives listed.

For Reduced Current Applications (18A to 20A Requirement):

FDS8870 (onsemi) is the preferred substitute when application current requirements do not exceed 18A. This device is classified as Active, ensuring long-term supply availability and ongoing manufacturer support. It maintains the 30V Vdss rating, delivers equivalent on-resistance performance (4.2 mOhm), and operates across the full temperature range. The FDS8870 is ROHS3 compliant with MSL 1 rating, providing superior moisture handling compared to the main part.

IRF7832TRPBF (Infineon Technologies) is an alternative substitute for applications requiring up to 20A. This device is Active status with ROHS3 compliance and MSL 1 rating. It offers superior gate charge characteristics (51 nC) and slightly lower on-resistance (4.0 mOhm), resulting in reduced switching losses and improved thermal performance.

AO4430 (Alpha & Omega Semiconductor Inc.) is classified as Not For New Designs and is not recommended for new applications. While it maintains 30V Vdss compatibility, its higher on-resistance (5.5 mOhm) and elevated gate charge (124 nC) result in increased power dissipation and reduced efficiency compared to FDS8870 and IRF7832TRPBF alternatives.

Package Consideration:

The main part features an 8-SOIC-EP package with exposed pad for enhanced thermal dissipation. Substitute parts utilize standard 8-SOIC or 8-SO packages without exposed pads. Applications with stringent thermal requirements may require additional heat management provisions when transitioning to substitute parts.

Frequently Asked Questions (FAQ)

Q: Can the AO4430 directly replace the STSJ100NHS3LL?

A: The AO4430 is not a direct replacement. While both devices share the 30V Vdss rating and 8-SOIC package form factor, the AO4430 is rated for only 18A continuous drain current compared to the STSJ100NHS3LL's 100A rating. The AO4430 is suitable only for applications where the full 100A capability is not required. Additionally, the AO4430 is classified as Not For New Designs, limiting its suitability for ongoing production.

Q: What is the primary limitation when substituting with FDS8870 or IRF7832TRPBF?

A: The primary limitation is reduced current handling capability. The FDS8870 and IRF7832TRPBF are rated for 18A and 20A continuous drain current, respectively, compared to the STSJ100NHS3LL's 100A rating. These substitutes are suitable only for applications where the required continuous drain current does not exceed their respective ratings. Applications requiring the full 100A capability cannot use these alternatives.

Q: How does the package difference affect thermal performance?

A: The STSJ100NHS3LL features an 8-SOIC-EP package with an exposed pad, which provides direct thermal coupling to the PCB for enhanced heat dissipation. The substitute parts (FDS8870 and IRF7832TRPBF) utilize standard 8-SOIC or 8-SO packages without exposed pads. In applications with high power dissipation, the absence of the exposed pad may require additional thermal management measures such as increased copper area, thermal vias, or external heat sinking to maintain equivalent junction temperatures.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The STSJ100NHS3LL, AO4430, FDS8870, and IRF7832TRPBF are all ROHS3 compliant, ensuring compatibility with regulatory requirements and environmental standards across all options.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: The STSJ100NHS3LL carries an MSL 3 rating with a 168-hour floor life, requiring controlled storage and handling conditions. The substitute parts (AO4430, FDS8870, and IRF7832TRPBF) all carry MSL 1 ratings with unlimited floor life, eliminating moisture sensitivity concerns and simplifying inventory management and handling procedures.

Q: Which substitute part offers the best on-resistance performance?

A: The IRF7832TRPBF delivers the lowest on-resistance at 4.0 mOhm (@ 20A, 10V), followed by the FDS8870 at 4.2 mOhm (@ 18A, 10V). Both are superior to the AO4430's 5.5 mOhm specification. Lower on-resistance reduces conduction losses and improves overall circuit efficiency.

Q: Can I use these substitutes in high-temperature applications?

A: All substitute parts maintain the -55°C to 150°C operating temperature range of the main part, with the IRF7832TRPBF extending to 155°C. Temperature compatibility is maintained across all options for standard industrial and automotive applications within these ranges.

Q: Why is the FDS8870 recommended over the AO4430?

A: The FDS8870 is recommended because it is classified as Active, ensuring ongoing manufacturer support and supply availability. It also delivers superior electrical performance with lower on-resistance (4.2 mOhm vs. 5.5 mOhm) and reduced gate charge (112 nC vs. 124 nC), resulting in lower power dissipation and improved switching efficiency. The AO4430 is classified as Not For New Designs, limiting its long-term viability.

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