STP80NF55-08 Equivalent & Substitute Parts

Part Overview

The STP80NF55-08 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 55V drain-to-source voltage and 80A continuous drain current at 25°C. This device is packaged in TO-220-3 through-hole configuration and is part of the STripFET™ series. The part is designated as "Not For New Designs," indicating it has been superseded in the manufacturer's product roadmap. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or performance optimization within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	80	A (Tc)
On-State Resistance (Rds On) @ 40A, 10V	8	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Power Dissipation (Max)	300	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220-3	Through Hole
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the STP80NF55-08 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must be equal to or greater than 55V
Continuous Drain Current (Id) must be equal to or greater than 80A at 25°C
On-State Resistance (Rds On) must support the same or lower resistance at comparable gate voltage and current conditions
Gate Threshold Voltage (Vgs(th)) must be within compatible range (4V nominal)
Operating temperature range must encompass -55°C to 175°C

Mechanical Compatibility Criteria:

Package type must be TO-220-3 through-hole configuration
Mounting type must be through-hole
Pin configuration must be compatible with TO-220-3 standard

Compliance Criteria:

RoHS3 compliance required
REACH unaffected status required
Moisture Sensitivity Level (MSL) 1 or equivalent

Substitute parts are grouped into two categories: Direct Equivalents (same voltage and current ratings) and Compatible Alternatives (equal or superior electrical ratings within the same package).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Power Dissipation (W)	Package	Status
STP80NF55-08	STMicroelectronics	55	80	8 @ 40A, 10V	4 @ 250µA	300	TO-220-3	Not For New Designs
STP75NF75	STMicroelectronics	75	80	11 @ 40A, 10V	4 @ 250µA	300	TO-220-3	Active
HUF75344P3	onsemi	55	75	8 @ 75A, 10V	4 @ 250µA	285	TO-220-3	Active
HUF75345P3	onsemi	55	75	7 @ 75A, 10V	4 @ 250µA	325	TO-220-3	Active
HUF75339P3	onsemi	55	75	12 @ 75A, 10V	4 @ 250µA	200	TO-220-3	Active
HUF75332P3	onsemi	55	60	19 @ 60A, 10V	4 @ 250µA	145	TO-220-3	Active
AUIRF3305	Infineon Technologies	55	140	8 @ 75A, 10V	4 @ 250µA	330	TO-220-3	Obsolete
IRF1010EPBF	Infineon Technologies	60	84	12 @ 50A, 10V	4 @ 250µA	200	TO-220-3	Not For New Designs
DMNH6008SCTQ	Diodes Incorporated	60	130	8 @ 20A, 10V	4 @ 250µA	210	TO-220-3	Active
AOT2610L	Alpha & Omega Semiconductor Inc.	60	55	10.7 @ 20A, 10V	2.5 @ 250µA	75	TO-220-3	Active
AOT470	Alpha & Omega Semiconductor Inc.	75	100	10.5 @ 30A, 10V	4 @ 250µA	268	TO-220-3	Active

Engineering Selection Recommendations

Primary Substitute (Direct Equivalent):

The STP75NF75 (STMicroelectronics) is the recommended direct substitute. It maintains the same 80A continuous drain current rating, identical gate threshold voltage, and equivalent power dissipation. The higher Vdss rating (75V vs. 55V) provides additional voltage margin without compromising performance. This part is in Active product status, ensuring long-term availability and supply continuity. Both parts share the STripFET™ series heritage and are RoHS3 compliant.

Secondary Substitutes (Compatible Alternatives):

The HUF75344P3 and HUF75345P3 (onsemi, UltraFET™ series) are compatible alternatives with identical 55V Vdss rating. Both maintain the same gate threshold voltage and operating temperature range. The HUF75345P3 offers superior on-state resistance (7 mOhm vs. 8 mOhm) and higher power dissipation capability (325W vs. 300W), making it suitable for applications requiring enhanced thermal performance. Both parts are in Active status with established supply chains.

Higher Current Alternatives:

The AUIRF3305 (Infineon, HEXFET® series) provides 140A continuous drain current at 55V, exceeding the STP80NF55-08 current rating. However, this part is designated Obsolete and should not be selected for new applications. The DMNH6008SCTQ (Diodes Incorporated) offers 130A at 60V with Active status and AEC-Q101 automotive qualification, suitable for applications requiring higher current capacity and automotive-grade reliability.

Lower Current Alternatives:

The HUF75332P3 (onsemi) provides 60A at 55V and is suitable only for applications where the 80A rating is not required. The AOT2610L (Alpha & Omega Semiconductor Inc.) operates at 60V with 55A continuous current and is appropriate for reduced current applications.

Voltage-Elevated Alternatives:

The AOT470 (Alpha & Omega Semiconductor Inc.) provides 100A at 75V, offering both higher voltage and current ratings. This part is suitable for applications requiring enhanced voltage headroom and higher current capacity.

All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and MSL 1 rating. Selection should be based on specific application requirements for voltage margin, current capacity, thermal performance, and supply availability.

Frequently Asked Questions (FAQ)

Q: Can the STP75NF75 directly replace the STP80NF55-08 in existing designs?

A: Yes. The STP75NF75 maintains electrical compatibility with identical continuous drain current (80A), gate threshold voltage (4V), and power dissipation (300W). The higher Vdss rating (75V vs. 55V) provides additional voltage margin. Both parts use TO-220-3 packaging and are pin-compatible. No circuit modifications are required.

Q: What is the difference between the HUF75344P3 and HUF75345P3?

A: Both parts share identical electrical ratings (55V, 75A) and package configuration. The primary differences are on-state resistance (8 mOhm vs. 7 mOhm) and power dissipation capability (285W vs. 325W). The HUF75345P3 offers superior thermal performance and lower conduction losses, making it preferable for high-power applications.

Q: Why is the AUIRF3305 not recommended despite higher current rating?

A: The AUIRF3305 is designated Obsolete, indicating discontinued manufacturing and limited future availability. While it provides 140A continuous current at 55V, the Active-status alternatives (HUF75344P3, HUF75345P3, DMNH6008SCTQ) offer equivalent or superior performance with assured long-term supply.

Q: Can I use the AOT2610L as a substitute if my application requires only 55A?

A: The AOT2610L is electrically compatible at 60V and 55A, but the gate threshold voltage differs (2.5V vs. 4V). This lower threshold may affect gate drive circuit design and switching characteristics. Verify gate drive compatibility before selection.

Q: Is the DMNH6008SCTQ suitable for automotive applications?

A: Yes. The DMNH6008SCTQ carries AEC-Q101 automotive qualification and is designated as an automotive-grade component. It provides 130A at 60V with 8 mOhm on-state resistance, making it suitable for automotive power management applications requiring higher current capacity than the STP80NF55-08.

Q: What is the significance of the "Not For New Designs" status?

A: This designation indicates the manufacturer has superseded the part in their product roadmap. While existing inventory may be available, the manufacturer does not recommend this part for new circuit designs. Active-status alternatives should be prioritized for new development to ensure long-term supply continuity and access to design support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the STP80NF55-08.

Q: Can I use a higher voltage-rated part (75V or 60V) in a 55V application?

A: Yes. Higher voltage-rated MOSFETs are backward-compatible in lower voltage applications. The STP75NF75 (75V) and AOT470 (75V) can operate safely in 55V circuits. The higher voltage rating provides additional safety margin without performance degradation.

Q: What factors should I consider when selecting between multiple substitutes?

A: Selection criteria include: (1) Product Status (Active preferred over Obsolete or Not For New Designs), (2) Current requirement (80A minimum for direct equivalence), (3) Voltage margin (55V minimum), (4) Thermal performance (power dissipation capability), (5) On-state resistance (lower is preferable for efficiency), (6) Supply availability, and (7) Application-specific certifications (automotive, industrial, etc.).

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