FES16GT Equivalent & Substitute Parts

Part Overview

The FES16GT is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 16 A average rectified current in a TO-220-2 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The FES16GT operates with fast recovery characteristics (≤500 ns) and a 50 ns reverse recovery time, suitable for standard rectification applications requiring moderate voltage and current ratings. Substitution is required due to product obsolescence and limited inventory availability relative to active alternatives.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 8	V @ A
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10 µA @ 400 V	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the FES16GT is determined by the following critical parameters:

Voltage Rating (Vr): The substitute must support a minimum of 400 V DC reverse voltage. Parts rated at 600 V are acceptable as they provide voltage margin but are not required.

Current Rating (Io): The substitute must support a minimum of 16 A average rectified current. Parts rated at 15 A or lower do not meet the current requirement and are classified as similar alternatives only. Parts rated at 16 A or higher are direct equivalents.

Package Type: All substitutes must use TO-220-2 through-hole packaging to ensure mechanical and thermal compatibility.

Speed Classification: All substitutes must maintain fast recovery characteristics (≤500 ns) consistent with the original part.

Mounting Type: Through-hole mounting is mandatory for all substitutes.

Substitutes are grouped into two categories:

Direct Equivalents: Parts meeting or exceeding both 400 V and 16 A specifications.

Similar Alternatives: Parts meeting the 400 V voltage requirement but with current ratings below 16 A, or parts with voltage ratings above 400 V that provide design margin but exceed the original specification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Status
FES16GT	onsemi	400	16	1.3 @ 8 A	50	10 @ 400 V	TO-220-2	Obsolete
FES16GT-E3/45	Vishay General Semiconductor - Diodes Division	400	16	1.3 @ 16 A	50	10 @ 400 V	TO-220-2	Active
DPG10I400PA	IXYS	400	10	1.32 @ 10 A	45	1 @ 400 V	TO-220-2	Active
DSEP15-06B	IXYS	600	15	2.52 @ 15 A	30	100 @ 600 V	TO-220-2	Active
SDUR1040	SMC Diode Solutions	400	—	1.3 @ 10 A	45	10 @ 400 V	TO-220-2	Active
SDUR1540	SMC Diode Solutions	400	15	1.25 @ 15 A	45	10 @ 400 V	TO-220-2	Active
STTH15L06D	STMicroelectronics	600	15	1.55 @ 15 A	85	15 @ 600 V	TO-220-2	Active
STTH20R04D	STMicroelectronics	400	20	1.7 @ 20 A	45	20 @ 400 V	TO-220-2	Active
STTH30R04D	STMicroelectronics	400	30	1.45 @ 30 A	100	15 @ 400 V	TO-220-2	Active

Engineering Selection Recommendations

Direct Equivalent:

FES16GT-E3/45 is the primary direct equivalent. It matches the FES16GT in voltage rating (400 V), current rating (16 A), reverse recovery time (50 ns), and reverse leakage current (10 µA @ 400 V). The part is manufactured by Vishay General Semiconductor - Diodes Division and carries active product status. It is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. Inventory availability is 37,200 units, providing supply continuity.

Higher Current Alternatives (400 V Rating):

STTH20R04D and STTH30R04D are manufactured by STMicroelectronics and maintain the 400 V voltage rating while providing 20 A and 30 A current capacity respectively. Both are active products with RoHS3 compliance and REACH unaffected status. These parts are suitable for applications where current margin is required or where the FES16GT-E3/45 is unavailable.

Lower Current Alternatives (400 V Rating):

SDUR1540 is manufactured by SMC Diode Solutions and provides 15 A at 400 V. It is an active product with RoHS3 compliance. However, REACH status is listed as affected. This part is suitable only for applications where 15 A current capacity is acceptable.

Higher Voltage Alternatives (600 V Rating):

DSEP15-06B and STTH15L06D are rated at 600 V and 15 A. Both are active products with RoHS3 compliance and REACH unaffected status. These parts provide voltage margin but do not meet the original 16 A current specification. DSEP15-06B is manufactured by IXYS; STTH15L06D is manufactured by STMicroelectronics. Selection between these alternatives depends on application requirements for voltage margin and acceptable current derating.

Not Recommended:

DPG10I400PA and SDUR1040 do not meet the 16 A current requirement and are classified as similar alternatives only. DPG10I400PA provides 10 A; SDUR1040 does not specify current rating. These parts are suitable only for applications with reduced current requirements.

Frequently Asked Questions (FAQ)

Q: Can FES16GT-E3/45 be used as a direct replacement for FES16GT?

A: Yes. FES16GT-E3/45 is a direct equivalent. It matches the voltage rating (400 V), current rating (16 A), reverse recovery time (50 ns), and reverse leakage current (10 µA @ 400 V). The part is active, RoHS3 compliant, and has adequate inventory availability.

Q: What is the difference between FES16GT and FES16GT-E3/45?

A: Both parts share the same base product number (FES16) and electrical specifications. The primary difference is product status: FES16GT is obsolete, while FES16GT-E3/45 is active. FES16GT-E3/45 is packaged in tubes and carries RoHS3 compliance certification.

Q: Can I use STTH20R04D or STTH30R04D instead of FES16GT?

A: Yes, with design consideration. Both parts maintain the 400 V voltage rating and provide higher current capacity (20 A and 30 A respectively). They are suitable for applications where current margin is beneficial or required. Both are active products with RoHS3 compliance and REACH unaffected status.

Q: Why are DSEP15-06B and STTH15L06D listed as alternatives if they do not meet the 16 A specification?

A: These parts are listed as similar alternatives because they provide 600 V voltage rating, which exceeds the original 400 V specification. They are suitable for applications where voltage margin is required or where the original 16 A current specification can be derated to 15 A. Both are active products with RoHS3 compliance.

Q: What is the significance of the TO-220-2 package?

A: TO-220-2 is a through-hole package with two leads, providing mechanical and thermal compatibility across all listed substitutes. This package type ensures that substitutes can be mounted using the same PCB footprint and thermal management approach as the original FES16GT.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant except where noted. SDUR1040 and SDUR1540 (SMC Diode Solutions) are RoHS3 compliant but carry REACH affected status, indicating regulatory considerations for specific applications.

Q: What does "REACH Unaffected" mean?

A: REACH unaffected status indicates that the part does not contain substances of very high concern (SVHC) listed under the EU REACH regulation. This status simplifies compliance for applications subject to REACH requirements.

Q: Can DPG10I400PA be used in place of FES16GT?

A: DPG10I400PA is not a direct equivalent. It provides only 10 A current capacity compared to the FES16GT's 16 A rating. It is suitable only for applications where the current requirement is 10 A or lower. The part is active and RoHS3 compliant.

Q: What is the reverse recovery time (trr) and why does it matter?

A: Reverse recovery time is the time required for a diode to stop conducting in the reverse direction after the forward current is removed. The FES16GT has a 50 ns trr. Substitute parts with different trr values (such as STTH15L06D at 85 ns or STTH30R04D at 100 ns) may affect switching performance in high-frequency applications. Selection should consider circuit switching frequency requirements.

Q: Why is FES16GT classified as obsolete?

A: Product obsolescence is determined by the manufacturer. Obsolete status indicates that the part is no longer in active production and future availability cannot be guaranteed. Substitution to active alternatives ensures long-term design support and supply continuity.

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