STW75NF30 Equivalent & Substitute Parts

Part Overview

The STW75NF30 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 300V drain-to-source voltage and 60A continuous drain current at 25°C. This device is packaged in TO-247-3 and belongs to the STripFET™ series. The part is currently classified as obsolete, making identification of equivalent and substitute components necessary for design continuity and procurement planning. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with comparable performance characteristics within the same voltage and current class.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	300	V
Continuous Drain Current (Id) @ 25°C	60	A
On-State Resistance (Rds On) @ 30A, 10V	45	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	164	nC
Power Dissipation (Max)	320	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the STW75NF30 is determined by the following critical parameters: drain-to-source voltage rating (300V), continuous drain current capability (60A nominal), on-state resistance characteristics, gate charge, and through-hole mounting compatibility. Parts are grouped into two categories:

Parametric Equivalent: Parts with identical electrical specifications and the same TO-247-3 package footprint, differing only in product status or packaging format.

Functional Substitutes: Parts with 300V Vdss rating and comparable drain current (59A to 94A range), maintaining compatible gate charge and on-state resistance profiles. These parts may use alternative package variants (TO-247AD, TO-3PN, TO-264AA, ISOPLUS247™) but retain through-hole mounting and equivalent thermal performance characteristics.

Substitution logic is based strictly on: (1) matching or exceeding voltage rating, (2) drain current within acceptable operating range, (3) compatible gate drive requirements (10V drive voltage), (4) through-hole mounting compatibility, and (5) operating temperature range alignment (-55°C to 150°C).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Pd Max (W)	Package	Status
STW75NF30	STMicroelectronics	300	60	45 @ 30A	164 @ 10V	320	TO-247-3	Obsolete
STW74NF30	STMicroelectronics	300	60	45 @ 30A	164 @ 10V	320	TO-247-3	Active
FDA59N30	onsemi	300	59	56 @ 29.5A	100 @ 10V	500	TO-3PN	Active
IXFH40N30	IXYS	300	40	85 @ 500mA	200 @ 10V	300	TO-247-3	Active
IXFH69N30P	IXYS	300	69	49 @ 500mA	180 @ 10V	500	TO-247-3	Active
IXFH86N30T	IXYS	300	86	43 @ 43A	180 @ 10V	860	TO-247-3	Active
IXFH88N30P	IXYS	300	88	40 @ 44A	180 @ 10V	600	TO-247-3	Active
IXFH94N30P3	IXYS	300	94	36 @ 47A	102 @ 10V	1040	TO-247-3	Active
IXFK88N30P	IXYS	300	88	40 @ 44A	180 @ 10V	600	TO-264AA	Active
IXFR102N30P	IXYS	300	60	36 @ 51A	224 @ 10V	250	ISOPLUS247™	Active
IXFR90N30	IXYS	300	75	33 @ 45A	360 @ 10V	417	ISOPLUS247™	Active

Engineering Selection Recommendations

Primary Equivalent: STW74NF30 (STMicroelectronics) is the direct parametric equivalent with identical electrical specifications and active product status. This part is the preferred replacement for obsolete STW75NF30 applications, maintaining full compatibility with existing PCB layouts and thermal management designs.

Secondary Equivalents for Higher Current Applications: IXFH88N30P and IXFH94N30P3 (IXYS) provide superior current handling (88A and 94A respectively) with improved on-state resistance and power dissipation ratings. These parts are suitable for applications requiring design margin or thermal headroom beyond the original 60A specification.

Alternative for Compact Packaging: IXFK88N30P (IXYS) offers identical electrical performance to IXFH88N30P but in TO-264AA package, providing a smaller footprint alternative for space-constrained designs while maintaining through-hole mounting.

Lower Current Alternative: IXFH40N30 (IXYS) is suitable only for applications with reduced current requirements (40A maximum) and should not be used as a direct substitute for 60A-rated designs.

Package Variant Consideration: FDA59N30 (onsemi) and IXFR102N30P/IXFR90N30 (IXYS) use alternative package types (TO-3PN and ISOPLUS247™ respectively) and require PCB layout modifications. These are functional alternatives only when package changes are acceptable.

All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and operating temperature range compatibility (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can STW74NF30 be used as a direct replacement for STW75NF30?

A: Yes. STW74NF30 is a parametric equivalent with identical drain-to-source voltage (300V), continuous drain current (60A), on-state resistance (45 mOhm @ 30A, 10V), gate charge (164 nC @ 10V), and power dissipation (320W). Both use TO-247-3 packaging. The primary difference is product status: STW75NF30 is obsolete while STW74NF30 is active. No circuit modifications are required.

Q: What is the difference between TO-247-3 and TO-247AD packages?

A: Both are through-hole packages with identical pin configurations and footprints suitable for TO-247-3 PCB layouts. TO-247AD is a variant designation used by IXYS for their HiPerFET™ series. Parts using either designation are mechanically and electrically interchangeable on standard TO-247-3 footprints.

Q: Can IXFH88N30P replace STW75NF30 in a 60A application?

A: Yes, with design margin. IXFH88N30P is rated for 88A continuous drain current, exceeding the 60A requirement. It provides superior on-state resistance (40 mOhm @ 44A vs. 45 mOhm @ 30A) and higher power dissipation capability (600W vs. 320W). Gate charge (180 nC) is slightly higher than STW75NF30 (164 nC), requiring minimal gate drive circuit adjustment. Both use TO-247-3 packaging.

Q: Why does FDA59N30 have different on-state resistance test conditions?

A: FDA59N30 (onsemi) specifies Rds On at 29.5A and 10V (56 mOhm), while STW75NF30 specifies at 30A and 10V (45 mOhm). The test current difference is negligible. The higher Rds On value reflects onsemi's measurement methodology and device characteristics. FDA59N30 uses TO-3PN package, requiring PCB layout changes.

Q: Is IXFH40N30 suitable for STW75NF30 replacement?

A: No. IXFH40N30 is rated for 40A continuous drain current, which is insufficient for applications designed for 60A operation. This part should only be considered for new designs with reduced current requirements.

Q: What are the thermal implications of switching from STW75NF30 to IXFH88N30P?

A: IXFH88N30P has higher power dissipation capability (600W vs. 320W) and lower on-state resistance (40 mOhm vs. 45 mOhm). In a 60A application, this results in lower junction temperature rise and improved thermal margin. Existing heatsink designs will remain adequate; thermal performance will improve.

Q: Can parts with ISOPLUS247™ package be used on standard TO-247-3 PCBs?

A: ISOPLUS247™ parts (IXFR102N30P, IXFR90N30) have the same pin configuration and footprint as TO-247-3 but feature isolated drain tabs for improved thermal performance. They are mechanically compatible with TO-247-3 PCB layouts. However, thermal design benefits require proper isolation implementation in PCB layout.

Q: What is the significance of gate charge (Qg) differences between substitutes?

A: Gate charge affects gate drive circuit design and switching speed. STW75NF30 has 164 nC gate charge. Substitutes range from 100 nC (FDA59N30) to 360 nC (IXFR90N30). Higher gate charge requires stronger gate drive capability and increases switching losses. For most applications, gate drive circuits designed for 164-180 nC will accommodate substitutes within this range without modification.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, matching the environmental compliance profile of STW75NF30.

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