STF140N8F7 Equivalent & Substitute Parts

Part Overview

The STF140N8F7 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 80V drain-to-source voltage and 64A continuous drain current in a Through Hole TO-220FP package. This device is part of the DeepGATE™ and STripFET™ VII series and is currently classified as obsolete. Due to its obsolete status, equivalent substitute parts with comparable electrical and mechanical specifications are necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	80	V
Current - Continuous Drain (Id) @ 25°C	64	A
Rds On (Max) @ Id, Vgs	4.3 @ 32A, 10V	mOhm
Power Dissipation (Max)	35	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STF140N8F7 are selected based on the following critical parameters:

Electrical Compatibility Criteria:

FET Type: N-Channel (required match)
Technology: MOSFET (Metal Oxide) (required match)
Drain to Source Voltage (Vdss): Minimum 80V (equal or higher acceptable)
Continuous Drain Current (Id): Minimum 64A (equal or higher acceptable)
Rds On (Max): Comparable on-resistance characteristics
Gate Charge (Qg): Similar switching characteristics
Vgs (Max): ±20V (required match)
Operating Temperature Range: -55°C to 175°C (required match)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required match)
Package / Case: TO-220-3 Full Pack (required match)
Supplier Device Package: TO-220F or TO-220FP variants (pin-compatible)

Compliance Criteria:

RoHS Status: ROHS3 Compliant (required match)
REACH Status: REACH Unaffected (required match)

All substitute parts listed meet or exceed the electrical specifications of the STF140N8F7 while maintaining mechanical and thermal compatibility within the TO-220 package family.

Parameter Comparison

Parameter	STF140N8F7	AOTF290L	AOTF292L	FDPF045N10A	TK65A10N1,S4X
Manufacturer	STMicroelectronics	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	onsemi	Toshiba Semiconductor and Storage
Product Status	Obsolete	Active	Active	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	80 V	100 V	100 V	100 V	100 V
Current - Continuous Drain (Id) @ 25°C	64 A	72 A	70 A	67 A	65 A
Rds On (Max) @ Id, Vgs	4.3 mOhm @ 32A, 10V	4.2 mOhm @ 20A, 10V	4.5 mOhm @ 20A, 10V	4.5 mOhm @ 67A, 10V	4.8 mOhm @ 32.5A, 10V
Vgs(th) (Max) @ Id	4.5 V @ 250µA	4.1 V @ 250µA	3.4 V @ 250µA	4 V @ 250µA	4 V @ 1mA
Gate Charge (Qg) (Max) @ Vgs	96 nC @ 10 V	126 nC @ 10 V	126 nC @ 10 V	74 nC @ 10 V	81 nC @ 10 V
Vgs (Max)	±20 V	±20 V	±20 V	±20 V	±20 V
Input Capacitance (Ciss) (Max) @ Vds	6340 pF @ 40 V	7180 pF @ 50 V	6775 pF @ 50 V	5270 pF @ 50 V	5400 pF @ 50 V
Power Dissipation (Max)	35 W	48 W	47 W	43 W	45 W
Operating Temperature Range	-55 to 175 °C	-55 to 175 °C	-55 to 175 °C	-55 to 175 °C	-55 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Supplier Device Package	TO-220FP	TO-220F	TO-220F	TO-220F-3	TO-220SIS
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

AOTF290L (Alpha & Omega Semiconductor Inc.)

The AOTF290L is an active product with higher voltage rating (100V) and current capability (72A) compared to the STF140N8F7. This part provides enhanced performance headroom with improved power dissipation (48W). The device maintains full RoHS3 compliance and REACH unaffected status. The TO-220F package is mechanically compatible with the original TO-220FP footprint. This substitute is suitable for applications requiring higher current capacity and thermal performance.

AOTF292L (Alpha & Omega Semiconductor Inc.)

The AOTF292L is an active product from the AlphaSGT™ series with 100V rating and 70A continuous current. This part offers comparable performance to the STF140N8F7 with enhanced voltage margin. The device supports dual drive voltage options (6V and 10V) and features lower threshold voltage (3.4V). Full RoHS3 and REACH compliance is maintained. The TO-220F package provides mechanical compatibility. This substitute is appropriate for designs requiring improved gate drive flexibility.

FDPF045N10A (onsemi)

The FDPF045N10A is an active product from the PowerTrench® series with 100V rating and 67A continuous current. This part delivers the lowest gate charge (74 nC) among all substitutes, resulting in faster switching characteristics and reduced drive circuit stress. Input capacitance is also minimized (5270 pF), supporting higher frequency operation. Full RoHS3 compliance is confirmed. The TO-220F-3 package is pin-compatible with the original design. This substitute is optimal for applications prioritizing switching speed and efficiency.

TK65A10N1,S4X (Toshiba Semiconductor and Storage)

The TK65A10N1,S4X is an active product from the U-MOSVIII-H series with 100V rating and 65A continuous current. This part provides the closest current rating match to the original STF140N8F7 (65A versus 64A). The device maintains full RoHS3 compliance. The TO-220SIS package is mechanically compatible with TO-220 footprints. Note that the maximum operating temperature is specified at 150°C, which is 25°C lower than the original part. This substitute is suitable for applications with standard thermal requirements and where current matching is prioritized.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the STF140N8F7 with any of these substitute parts?

A: All listed substitute parts are mechanically and electrically compatible with the STF140N8F7 within the TO-220 package family. However, the specific choice depends on your application requirements. All substitutes have higher voltage ratings (100V versus 80V) and comparable or higher current ratings, making them suitable drop-in replacements. Verify that your PCB layout accommodates the specific TO-220 variant (TO-220F, TO-220F-3, or TO-220SIS).

Q: What is the difference between TO-220FP, TO-220F, TO-220F-3, and TO-220SIS packages?

A: These are all Through Hole TO-220 package variants with three leads (Gate, Drain, Source). The primary differences are in mechanical details and thermal characteristics. TO-220FP (Full Pack) is the original package type. TO-220F and TO-220F-3 are standard variants. TO-220SIS is a Toshiba-specific variant. All are pin-compatible and can be used interchangeably on standard TO-220 footprints.

Q: Why do all substitute parts have higher voltage ratings (100V) than the original (80V)?

A: The substitute parts are selected from currently active product lines. Modern MOSFET designs at this current level typically feature 100V ratings as a standard specification. The higher voltage rating provides additional design margin and does not negatively impact performance in 80V applications. The parts will operate correctly in circuits designed for 80V operation.

Q: Which substitute part has the best switching performance?

A: The FDPF045N10A features the lowest gate charge (74 nC) and input capacitance (5270 pF), resulting in the fastest switching characteristics. This part is recommended for high-frequency applications or designs where switching losses are critical.

Q: Are there any thermal limitations I should consider?

A: The TK65A10N1,S4X has a maximum operating temperature of 150°C, which is 25°C lower than the other substitutes (175°C). If your application operates near the upper temperature limit, select AOTF290L, AOTF292L, or FDPF045N10A instead.

Q: Do all substitute parts have the same gate drive requirements?

A: All parts support ±20V maximum gate voltage. The AOTF292L offers dual drive voltage options (6V and 10V), while others specify 10V. Threshold voltages vary slightly (3.4V to 4.5V), which may affect gate drive circuit design. Verify your gate driver specifications against the selected substitute part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original STF140N8F7.

Q: What is the inventory status of these substitute parts?

A: FDPF045N10A has the highest inventory (6058 pcs), followed by AOTF290L (1900 pcs), AOTF292L (1130 pcs), and TK65A10N1,S4X (864 pcs). Availability may vary by supplier and region.

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