FDP75N08 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDP75N08 is an N-Channel MOSFET manufactured by onsemi, rated for 75V drain-to-source voltage with 75A continuous drain current in a Through Hole TO-220-3 package. This device is part of the UniFET™ series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance, and thermal characteristics while supporting the same Through Hole TO-220-3 package configuration.

Key Parameters

Parameter	FDP75N08 Value	Unit
Drain to Source Voltage (Vdss)	75	V
Continuous Drain Current (Id) @ 25°C	75	A (Tc)
On-Resistance (Rds On) @ 37.5A, 10V	11	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	104	nC
Input Capacitance (Ciss) @ 25V	4468	pF
Power Dissipation (Max)	131	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	TO-220-3	Through Hole
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitution of the FDP75N08 is determined by strict adherence to the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 75V
Continuous Drain Current (Id): Must equal or exceed 75A at 25°C (Tc rating)
Package Type: Must be Through Hole TO-220-3 configuration
FET Type: Must be N-Channel MOSFET (Metal Oxide technology)
On-Resistance (Rds On): Must not exceed 11mOhm at specified gate voltage and current conditions
Gate Threshold Voltage (Vgs(th)): Must be compatible with 4V specification at 250µA
Operating Temperature Range: Must support -55°C to 150°C minimum

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values indicate faster switching; values up to 160nC are acceptable
Input Capacitance (Ciss): Values between 2000pF and 5640pF maintain circuit compatibility
Power Dissipation: Must support minimum 131W (Tc) thermal requirements
Maximum Gate Voltage (Vgs): Must support ±20V operation

Substitute parts are grouped into two categories based on voltage rating alignment:

Category A - Exact Voltage Match (75V Vdss): Parts with 75V rating provide direct electrical equivalence and are preferred for direct replacement applications.

Category B - Lower Voltage Rating (55V-80V Vdss): Parts with voltage ratings below 75V (55V-60V) or above 75V (80V) are functional substitutes only when circuit design margins permit voltage derating or when higher voltage ratings provide additional safety margin.

Parameter Comparison

Parameter	FDP75N08	AOT2610L	AOT470	AUIRF3205	IRFB3607PBF	IRL3705NPBF	IRL3705ZPBF	PSMN012-80PS,127	STP75NF75	STP76NF75
Vdss (V)	75	60	75	55	75	55	55	80	75	75
Id @ 25°C (A, Tc)	75	55	100	75	80	89	75	74	80	80
Rds On (mOhm)	11	10.7	10.5	8	9	10	8	11	11	11
Vgs(th) (V)	4	2.5	4	4	4	2	3	4	4	4
Qg (nC)	104	30	136	146	84	98	60	43	160	160
Ciss (pF)	4468	2007	5640	3247	3070	3600	2880	2782	3700	3700
Power Dissipation (W, Tc)	131	75	268	200	140	170	130	148	300	300
Operating Temp (°C)	-55 to 150	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
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
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Active	Active	Obsolete	Active	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Exact Voltage Match - 75V Vdss):

STP76NF75 (STMicroelectronics) and STP75NF75 (STMicroelectronics) are the preferred substitutes for the FDP75N08. Both devices are classified as Active products, ensuring long-term availability and supply chain stability. These parts maintain the 75V Vdss rating, support 80A continuous drain current, and feature identical 11mOhm on-resistance specifications. The STripFET™ II series technology provides superior thermal performance with 300W power dissipation capability, exceeding the FDP75N08 specification of 131W. Both parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Operating temperature range extends to 175°C, providing additional thermal margin beyond the FDP75N08 specification of 150°C.

AOT470 (Alpha & Omega Semiconductor Inc.) is an alternative primary substitute with 75V Vdss rating and 100A continuous drain current capability. This Active product provides enhanced current capacity and 268W power dissipation, supporting higher-power applications. The 10.5mOhm on-resistance and 4V gate threshold voltage match the FDP75N08 electrical characteristics. ROHS3 compliance and extended operating temperature range to 175°C are provided.

Secondary Substitutes (Voltage Derating Required):

IRFB3607PBF (Infineon Technologies) maintains 75V Vdss rating with 80A continuous drain current and 9mOhm on-resistance, providing superior electrical performance. However, this part is classified as Not For New Designs, limiting its suitability for new product development. Existing designs currently using this device may continue with this substitute, but migration to Active products is recommended for long-term sustainability.

AUIRF3205 (International Rectifier) and IRL3705NPBF (Infineon Technologies) operate at 55V Vdss, requiring voltage derating analysis. These parts support 75A and 89A continuous drain current respectively, with on-resistance values of 8mOhm and 10mOhm. Both are Active products with extended operating temperature ranges to 175°C. These substitutes are suitable only when circuit design margins accommodate the 20V voltage reduction from the FDP75N08 specification.

PSMN012-80PS,127 (Nexperia USA Inc.) provides 80V Vdss rating with 74A continuous drain current and 11mOhm on-resistance. This Obsolete product shares the same obsolescence status as the FDP75N08 and should not be selected for new designs despite voltage rating advantages.

AOT2610L (Alpha & Omega Semiconductor Inc.) operates at 60V Vdss with 55A continuous drain current (Tc rating), representing a 15V voltage reduction and 20A current reduction from the FDP75N08. This Active product is suitable only for applications with reduced voltage and current requirements.

IRL3705ZPBF (International Rectifier) is an Active product with 55V Vdss rating, 75A continuous drain current, and 8mOhm on-resistance. This substitute requires voltage derating and is suitable for applications where the 20V voltage margin is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the FDP75N08 be directly replaced with STP76NF75 or STP75NF75?

A: Yes. Both STMicroelectronics devices are direct electrical and mechanical substitutes. They maintain the 75V Vdss rating, support 80A continuous drain current, feature identical 11mOhm on-resistance, and use the same TO-220-3 Through Hole package. Both are Active products with superior thermal performance (300W vs. 131W) and extended operating temperature range (175°C vs. 150°C). No circuit modifications are required.

Q: What is the difference between STP76NF75 and STP75NF75?

A: Both devices are electrically identical with 75V Vdss, 80A continuous drain current, 11mOhm on-resistance, and 300W power dissipation. The primary difference is inventory availability. STP75NF75 has significantly higher stock (364,133 pcs) compared to STP76NF75 (1,400 pcs). For applications requiring immediate availability, STP75NF75 is preferred.

Q: Can I use AUIRF3205 or IRL3705NPBF as substitutes despite their 55V Vdss rating?

A: These parts are functional substitutes only when circuit design analysis confirms that the 20V voltage reduction from 75V to 55V does not compromise system safety margins or performance. The 55V rating provides less headroom for voltage transients and overshoot conditions. These substitutes are suitable for applications with inherently lower voltage stress or where design margins accommodate the reduced voltage rating. Voltage derating analysis is required before selection.

Q: Why is IRFB3607PBF not recommended despite matching the 75V Vdss and 80A specifications?

A: IRFB3607PBF is classified as Not For New Designs by Infineon Technologies. While this part provides excellent electrical performance with 9mOhm on-resistance and 140W power dissipation, its obsolescence trajectory makes it unsuitable for new product development. Existing designs currently using this device may continue, but migration to Active products such as STP76NF75 or AOT470 is recommended for long-term supply chain stability.

Q: What is the significance of the TO-220-3 package requirement?

A: The TO-220-3 package is a Through Hole configuration with three leads (Gate, Drain, Source) designed for direct mounting on printed circuit boards with mechanical fastening capability. All substitute parts listed maintain this package type, ensuring mechanical and thermal compatibility without PCB redesign. Package compatibility is mandatory for direct substitution.

Q: How do I evaluate on-resistance (Rds On) differences between the FDP75N08 and substitute parts?

A: On-resistance directly affects power dissipation and thermal performance. The FDP75N08 specifies 11mOhm at 37.5A and 10V gate voltage. Substitute parts with lower on-resistance values (8mOhm to 10mOhm) such as AUIRF3205, IRFB3607PBF, and IRL3705ZPBF provide improved efficiency and reduced heat generation. Substitute parts with matching or slightly higher on-resistance (10.5mOhm to 11mOhm) such as AOT470, AOT2610L, and STP76NF75 maintain equivalent thermal characteristics. Higher on-resistance values increase power dissipation and may require enhanced thermal management.

Q: What does Product Status "Active" versus "Obsolete" mean for my design?

A: Active products are currently manufactured and supported by the supplier with guaranteed long-term availability. Obsolete products are no longer manufactured and have limited remaining inventory. For new designs, Active products are mandatory to ensure supply chain continuity. For existing designs using obsolete parts, transition planning to Active substitutes is recommended before inventory depletion occurs.

Q: Are there any compliance or regulatory differences between the FDP75N08 and substitute parts?

A: All substitute parts listed carry REACH Unaffected status, matching the FDP75N08 compliance profile. Most Active substitutes (STP76NF75, STP75NF75, AOT470, IRL3705NPBF, IRL3705ZPBF, IRFB3607PBF) are ROHS3 Compliant, exceeding the FDP75N08 regulatory requirements. This compliance enhancement supports modern manufacturing standards and environmental regulations without additional design modifications.

Q: Can I use AOT470 in applications requiring exactly 75A continuous current?

A: AOT470 supports 100A continuous drain current at 25°C (Tc rating), exceeding the 75A requirement of the FDP75N08. This higher current rating provides design margin and is fully compatible with applications requiring 75A operation. The device will operate well within its rated specifications, resulting in improved reliability and thermal performance.

Q: What thermal considerations apply when substituting the FDP75N08?

A: The FDP75N08 specifies 131W maximum power dissipation. Most substitute parts provide equal or superior thermal performance: STP76NF75 and STP75NF75 support 300W, AOT470 supports 268W, IRFB3607PBF supports 140W, and IRL3705NPBF supports 170W. Enhanced thermal performance allows operation at higher power levels or reduced heatsink requirements. Existing thermal designs based on 131W dissipation will operate conservatively with these substitutes, improving system reliability.

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