FES8DT/45 Equivalent & Substitute Parts

Part Overview

The FES8DT/45 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220AC package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The diode features fast recovery characteristics with a reverse recovery time of 35 ns and operates across a junction temperature range of -55°C to 150°C.

Substiute Parts

FES8DT/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 888FES8DT/45 Datasheet

Current PartRFQ

FES8DT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 19580FES8DT-E3/45 Datasheet

DirectRFQ

MUR820-BP

Micro Commercial CoIn Stock: 1070MUR820-BP Datasheet

MFR RecommendedRFQ

STTH1202D

STMicroelectronicsIn Stock: 1165STTH1202D Datasheet

MFR RecommendedRFQ

STTH802D

STMicroelectronicsIn Stock: 13958STTH802D Datasheet

MFR RecommendedRFQ

ER802_T0_00001

Panjit International Inc.In Stock: 2955ER802_T0_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FES8DT/45 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): 8 A (or higher)
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 35 ns (or lower)
• Mounting Type: Through Hole
• Package / Case: TO-220-2
• Supplier Device Package: TO-220AC

Substitution Categories:

Direct Equivalent (Identical Electrical Specifications):

• FES8DT-E3/45: Identical ratings with Active product status and RoHS3 compliance
• ER802_T0_00001: Identical ratings with Active product status and RoHS3 compliance

Manufacturer Recommended Equivalent (Vishay to STMicroelectronics):

• STTH802D: Identical current and voltage ratings with improved reverse recovery time (30 ns) and higher maximum junction temperature (175°C)

Manufacturer Recommended Equivalent (Vishay to Micro Commercial Co):

• MUR820-BP: Identical voltage and current ratings with marginally higher forward voltage (975 mV @ 8 A)

Higher Current Rated Equivalent (Uprated Substitute):

• STTH1202D: 200 V rating with 12 A current capacity (exceeds 8 A requirement) and higher maximum junction temperature (175°C)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

FES8DT-E3/45 is the primary direct replacement for the obsolete FES8DT/45. Both parts share identical electrical ratings (200 V, 8 A, 950 mV forward voltage, 35 ns recovery time). The FES8DT-E3/45 is Active in product status and RoHS3 compliant, addressing regulatory requirements. With 19,537 units in stock, this part offers superior availability compared to the original.

ER802_T0_00001 from Panjit International Inc. provides an alternative direct equivalent with identical electrical specifications and RoHS3 compliance. This part demonstrates superior reverse leakage characteristics (1 µA @ 200 V versus 10 µA @ 200 V), which may benefit applications with stringent leakage requirements.

For Enhanced Performance Substitution:

STTH802D from STMicroelectronics maintains the 200 V / 8 A rating while offering improved reverse recovery time (30 ns versus 35 ns) and extended maximum junction temperature rating (175°C versus 150°C). RoHS3 compliance and high inventory availability (13,877 units) support procurement reliability.

For Current Uprating:

STTH1202D from STMicroelectronics provides a 200 V / 12 A rating, exceeding the original 8 A specification. This part is suitable for applications requiring higher current capacity within the same voltage class. Maximum junction temperature is rated at 175°C with RoHS3 compliance.

For Alternative Sourcing:

MUR820-BP from Micro Commercial Co. offers 200 V / 8 A ratings with marginally higher forward voltage (975 mV @ 8 A) and superior reverse leakage (5 µA @ 200 V). This part supports supply chain diversification.

Compliance Considerations:

The original FES8DT/45 is RoHS non-compliant. All recommended substitutes (FES8DT-E3/45, STTH802D, ER802_T0_00001, STTH1202D) are RoHS3 compliant. All parts maintain REACH Unaffected status and EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can FES8DT-E3/45 be used as a direct drop-in replacement for FES8DT/45?

A: Yes. FES8DT-E3/45 is electrically and mechanically identical to FES8DT/45. Both are rated for 200 V reverse voltage, 8 A average rectified current, 950 mV forward voltage at 8 A, and 35 ns reverse recovery time. Both use TO-220-2 packaging. The primary difference is product status (Active versus Obsolete) and RoHS compliance (RoHS3 versus non-compliant).

Q: What is the difference between STTH802D and FES8DT/45?

A: STTH802D maintains identical voltage (200 V) and current (8 A) ratings. Key differences include: reverse recovery time of 30 ns (versus 35 ns), maximum junction temperature of 175°C (versus 150°C), and lower reverse leakage of 6 µA @ 200 V (versus 10 µA @ 200 V). Forward voltage is slightly higher at 1.05 V @ 8 A. All differences represent equal or improved performance characteristics.

Q: Can STTH1202D replace FES8DT/45 in all applications?

A: STTH1202D is electrically compatible with FES8DT/45 for voltage and speed specifications. The 12 A current rating exceeds the 8 A requirement, making it suitable for applications where current capacity is not a limiting factor. Mechanical compatibility (TO-220-2 package) is maintained. Applications must accommodate the higher forward voltage (1.1 V @ 12 A) and verify thermal management for the higher current rating.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference characteristics. STTH802D offers 30 ns recovery time versus 35 ns for FES8DT/45. This 5 ns improvement reduces switching losses and EMI in high-frequency applications. For DC rectification applications, this difference is typically negligible.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts (FES8DT-E3/45, STTH802D, MUR820-BP, ER802_T0_00001, STTH1202D) are RoHS3 compliant. The original FES8DT/45 is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulations.

Q: What packaging options are available for these substitutes?

A: FES8DT-E3/45, STTH802D, ER802_T0_00001, and STTH1202D are supplied in Tube packaging. MUR820-BP is supplied in Bulk packaging. All parts use identical TO-220-2 mechanical packages suitable for Through Hole mounting.

Q: Which substitute offers the lowest reverse leakage current?

A: ER802_T0_00001 demonstrates the lowest reverse leakage at 1 µA @ 200 V, compared to 10 µA @ 200 V for FES8DT/45. MUR820-BP offers 5 µA @ 200 V, and STTH802D offers 6 µA @ 200 V. Lower reverse leakage is beneficial for precision rectification and low-power applications.

Q: What is the inventory status of these parts?

A: FES8DT-E3/45 has the highest availability at 19,537 units. STTH802D follows with 13,877 units. ER802_T0_00001 has 2,942 units, STTH1202D has 1,140 units, and MUR820-BP has 992 units. The original FES8DT/45 has 844 units remaining.

Q: Are there thermal management differences between these diodes?

A: Maximum junction temperature ratings differ: FES8DT/45, FES8DT-E3/45, and ER802_T0_00001 are rated to 150°C. STTH802D and STTH1202D are rated to 175°C. The 25°C difference provides additional thermal margin in high-temperature environments. Forward voltage and reverse leakage characteristics also influence thermal performance.