AOTF7N70 N-Channel 700V 7A MOSFET Equivalent & Substitute Parts

Part Overview

The AOTF7N70 is an N-Channel metal oxide semiconductor field-effect transistor (MOSFET) manufactured by Alpha & Omega Semiconductor Inc., rated for 700V drain-to-source voltage and 7A continuous drain current in a through-hole TO-220-3 package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer available or procurement is limited.

Key Parameters

Parameter	AOTF7N70 Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	700	V
Continuous Drain Current (Id) @ 25°C	7	A
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	1.8 @ 3.5A, 10V	Ohm
Gate Threshold Voltage Vgs(th) (Max) @ Id	4.5 @ 250µA	V
Gate Charge (Qg) (Max) @ Vgs	25 @ 10V	nC
Maximum Gate Voltage Vgs (Max)	±30	V
Input Capacitance (Ciss) (Max) @ Vds	1175 @ 25V	pF
Power Dissipation (Max)	38.5	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AOTF7N70 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

FET Type: N-Channel
Technology: MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss): Equal to or greater than 700V
Continuous Drain Current (Id): Equal to or greater than 7A
Drive Voltage: 10V
Mounting Type: Through Hole
Package: TO-220-3 Full Pack or compatible TO-220 variant

Secondary Compatibility Parameters:

Gate Threshold Voltage (Vgs(th)): Within ±0.5V of 4.5V
Maximum Gate Voltage (Vgs Max): ±30V or greater
Operating Temperature Range: Minimum -55°C to 150°C
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts must maintain electrical performance within the specified operating envelope. Parts with higher voltage ratings, equal or greater current ratings, and compatible thermal characteristics are classified as direct substitutes. Parts with reduced current ratings or lower voltage ratings are classified as partial substitutes suitable only for reduced-load applications.

Parameter Comparison

Parameter	AOTF7N70	FQPF8N80C	STF5N60M2	STF5N65M6	STF5N80K5	STF6N65M2	STP5NK60ZFP	STP7NK80ZFP	TK4A65DA	TK5A60D	TK5A65D	Unit
Vdss	700	800	600	650	800	650	600	800	650	600	650	V
Id @ 25°C	7	8	3.7	4	4	4	5	5.2	3.5	5	5	A
Rds On (Max) @ 10V	1.8 @ 3.5A	1.55 @ 4A	1.4 @ 1.85A	—	1.75 @ 2A	1.35 @ 2A	1.6 @ 2.5A	1.8 @ 2.6A	1.9 @ 1.8A	1.43 @ 2.5A	1.43 @ 2.5A	Ohm
Vgs(th) (Max) @ Id	4.5 @ 250µA	5 @ 250µA	4 @ 250µA	—	5 @ 100µA	4 @ 250µA	4.5 @ 50µA	4.5 @ 100µA	4.4 @ 1mA	4.4 @ 1mA	4 @ 1mA	V
Qg (Max) @ 10V	25	45	4.5	—	5	9.8	34	56	12	16	16	nC
Ciss (Max) @ Vds	1175 @ 25V	2050 @ 25V	165 @ 100V	—	177 @ 100V	226 @ 100V	690 @ 25V	1138 @ 25V	600 @ 25V	700 @ 25V	800 @ 25V	pF
Power Dissipation (Max)	38.5	59	20	—	20	20	25	30	35	35	40	W
Operating Temperature	-55 to 150	-55 to 150	to 150	—	-55 to 150	-55 to 150	-55 to 150	-55 to 150	to 150	to 150	to 150	°C
Package	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	—
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	RoHS	ROHS3	ROHS3	—
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	—

Engineering Selection Recommendations

Direct Substitutes (Full Compatibility):

The FQPF8N80C (onsemi) and STP7NK80ZFP (STMicroelectronics) are the primary direct substitutes for the AOTF7N70. Both devices exceed the original specifications with higher voltage ratings (800V), equal or greater current ratings (8A and 5.2A respectively), and active product status. Both are ROHS3 compliant and rated for the full operating temperature range of -55°C to 150°C. The FQPF8N80C provides superior thermal performance at 59W maximum power dissipation compared to the original 38.5W, while the STP7NK80ZFP offers 30W dissipation with lower on-resistance characteristics.

Partial Substitutes (Reduced Current Rating):

The STF6N65M2 (STMicroelectronics), STF5N80K5 (STMicroelectronics), TK5A65D (Toshiba), and TK5A60D (Toshiba) are suitable substitutes for applications where the full 7A continuous current is not required. These devices maintain voltage ratings between 600V and 800V and provide current ratings between 4A and 5A. All are ROHS3 compliant with active product status. The STF6N65M2 offers the lowest on-resistance at 1.35 Ohm and is available in high inventory (18,150 units).

Limited Substitutes (Reduced Voltage Rating):

The STF5N60M2 (STMicroelectronics) and STP5NK60ZFP (STMicroelectronics) operate at 600V, which is below the original 700V specification. These devices are suitable only for applications where the maximum operating voltage does not exceed 600V. Both maintain 5A or greater current ratings and are ROHS3 compliant with active product status.

Inventory Availability:

The STP7NK80ZFP maintains the highest inventory level at 38,586 units, followed by the FQPF8N80C at 29,652 units and STF6N65M2 at 18,150 units. The original AOTF7N70 has 21,425 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the FQPF8N80C directly replace the AOTF7N70 in all applications?

A: The FQPF8N80C is a direct substitute from an electrical standpoint. It exceeds the voltage and current specifications of the AOTF7N70 and is pin-compatible in the TO-220-3 package. However, the higher input capacitance (2050 pF vs. 1175 pF) and gate charge (45 nC vs. 25 nC) may affect switching speed in high-frequency applications. Thermal design should account for the higher power dissipation capability (59W vs. 38.5W).

Q: What is the difference between TO-220F and TO-220FP packaging?

A: Both TO-220F and TO-220FP are through-hole TO-220-3 package variants. The designations indicate minor manufacturing or supplier-specific differences but are mechanically and electrically compatible. All substitute parts listed use compatible TO-220-3 package configurations suitable for the same PCB footprint.

Q: Why do some substitute parts have lower current ratings than the AOTF7N70?

A: Parts such as STF5N60M2 (3.7A) and STF5N80K5 (4A) are classified as partial substitutes. They are suitable for applications where the circuit design does not require the full 7A continuous current. These devices may offer advantages in on-resistance, gate charge, or thermal characteristics for lower-current applications.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except TK4A65DA, which is listed as RoHS Compliant (without the "3" designation). For applications requiring strict ROHS3 compliance, the TK4A65DA should be avoided in favor of alternatives such as STF6N65M2 or STP7NK80ZFP.

Q: What is the significance of the "Not For New Designs" status of the AOTF7N70?

A: This status indicates the AOTF7N70 has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available for a limited time, but long-term supply is not guaranteed. All substitute parts listed have "Active" product status, ensuring continued availability and support from manufacturers.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The AOTF7N70 has 25 nC gate charge, while substitutes range from 4.5 nC to 56 nC. Lower gate charge (STF5N60M2 at 4.5 nC) enables faster switching and lower driver power consumption. Higher gate charge (FQPF8N80C at 45 nC) may require stronger gate drivers but does not prevent substitution in standard applications.

Q: Can the STP7NK80ZFP be used in place of the AOTF7N70 despite lower current rating?

A: The STP7NK80ZFP is rated for 5.2A continuous current, which is below the AOTF7N70's 7A rating. It is suitable for applications where the maximum required current does not exceed 5.2A. The device offers superior voltage rating (800V vs. 700V) and active product status, making it a viable substitute for reduced-load applications.

Q: What thermal considerations apply when substituting the AOTF7N70?

A: The AOTF7N70 dissipates a maximum of 38.5W. Substitute parts range from 20W (STF5N60M2, STF5N80K5) to 59W (FQPF8N80C). If the original design includes thermal management for 38.5W, substitutes with lower power dissipation (20W to 30W) will operate cooler. Substitutes with higher dissipation (59W) require verification that the thermal design can accommodate the increased heat generation.

Q: Are Toshiba parts (TK series) compatible with the original Alpha & Omega design?

A: Yes, Toshiba parts such as TK5A65D and TK5A60D are electrically and mechanically compatible. They use the TO-220SIS package, which is a TO-220-3 variant. All electrical parameters fall within acceptable substitution ranges. Toshiba parts maintain ROHS3 compliance (TK5A60D and TK5A65D) or RoHS compliance (TK4A65DA) and have active product status.

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