FES8JT/45 Equivalent & Substitute Parts

Part Overview

The FES8JT/45 is a general-purpose rectifier diode rated for 600 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. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	FES8JT/45 Specification
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 8 A
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-2
Supplier Device Package	TO-220AC
Operating Temperature - Junction	-55°C ~ 150°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the FES8JT/45 are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 8 A minimum
Package / Case: TO-220-2 or TO-220AC equivalent
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Direct Equivalents (8 A @ 600 V): Parts meeting all primary criteria with identical current and voltage ratings are listed as direct substitutes. These include FES8JT-E3/45, DSEI8-06A, MUR860-BP, and MUR860G.

Higher Current Capacity Substitutes (≥ 8 A @ 600 V): Parts rated for currents exceeding 8 A at 600 V provide enhanced current handling capability. These include BYR29-600,127 (8 A), BYV29-600,127 (9 A), and STTH12R06DIRG (12 A). These are suitable for applications where the FES8JT/45 operates below its maximum current rating.

Lower Current Capacity Substitutes (< 8 A @ 600 V): Parts rated below 8 A, such as LQA03TC600 (3 A) and QH03TZ600 (3 A), are not suitable as direct replacements for the FES8JT/45 in applications requiring the full 8 A current capacity. These parts are listed for reference only and require circuit redesign or derating analysis.

Partial Specification Matches: LXA06T600 (6 A @ 600 V) falls below the 8 A requirement and is not recommended as a direct substitute.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Product Status	RoHS Status
FES8JT/45	Vishay	600 V	8	1.5 V @ 8 A	50	10 µA @ 600 V	TO-220AC	Obsolete	RoHS non-compliant
FES8JT-E3/45	Vishay	600 V	8	1.5 V @ 8 A	50	10 µA @ 600 V	TO-220AC	Active	ROHS3 Compliant
BYR29-600,127	WeEn Semiconductors	600 V	8	1.5 V @ 8 A	75	10 µA @ 600 V	TO-220AC	Active	RoHS Compliant
BYV29-600,127	WeEn Semiconductors	600 V	9	1.25 V @ 8 A	60	50 µA @ 600 V	TO-220AC	Active	RoHS Compliant
DSEI8-06A	IXYS	600 V	8	1.5 V @ 8 A	50	20 µA @ 600 V	TO-220AC	Active	ROHS3 Compliant
LQA03TC600	Power Integrations	600 V	3	3.1 V @ 3 A	13	20 µA @ 600 V	TO-220AC	Active	RoHS Compliant
LXA06T600	Power Integrations	600 V	6	2.94 V @ 6 A	23	250 µA @ 600 V	TO-220AC	Active	RoHS Compliant
MUR860-BP	Micro Commercial Co	600 V	8	1.5 V @ 8 A	50	5 µA @ 600 V	TO-220AC	Active	Not specified
MUR860G	onsemi	600 V	8	1.5 V @ 8 A	60	10 µA @ 600 V	TO-220-2	Active	ROHS3 Compliant
QH03TZ600	Power Integrations	600 V	3	3 V @ 3 A	9.8	250 µA @ 600 V	TO-220AC	Active	RoHS Compliant
STTH12R06DIRG	STMicroelectronics	600 V	12	2.9 V @ 12 A	45	45 µA @ 600 V	TO-220AC ins	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Substitutes (8 A @ 600 V, Active Status):

FES8JT-E3/45 (Vishay) – Identical electrical specifications to the FES8JT/45 with active product status and ROHS3 compliance. This is the preferred substitute for direct replacement in existing designs. Packaging is Tube format.
DSEI8-06A (IXYS FRED Series) – Meets all electrical requirements with 8 A @ 600 V, 50 ns reverse recovery time, and ROHS3 compliance. Offers high inventory availability (20,786 pcs). Operating temperature range extends to -40°C ~ 150°C.
MUR860G (onsemi SWITCHMODE™ Series) – Provides 8 A @ 600 V with ROHS3 compliance and extended operating temperature range (-65°C ~ 175°C). Highest inventory availability (32,500 pcs). Reverse recovery time is 60 ns.
MUR860-BP (Micro Commercial Co) – Meets electrical specifications with 8 A @ 600 V and 50 ns reverse recovery time. Lowest reverse leakage current (5 µA @ 600 V). Bulk packaging format.

Higher Current Capacity Alternatives (≥ 8 A @ 600 V, Active Status):

BYR29-600,127 (WeEn Semiconductors) – 8 A @ 600 V with RoHS compliance. Reverse recovery time is 75 ns. Suitable for applications operating below maximum current rating.
BYV29-600,127 (WeEn Semiconductors) – 9 A @ 600 V with improved forward voltage (1.25 V @ 8 A) and 60 ns reverse recovery time. RoHS compliant. Provides current margin above the FES8JT/45 specification.
STTH12R06DIRG (STMicroelectronics) – 12 A @ 600 V with 45 ns reverse recovery time and ROHS3 compliance. Insulated TO-220AC package. Highest current capacity among listed substitutes. Maximum junction temperature 175°C.

Not Recommended as Direct Substitutes:

Parts rated below 8 A (LQA03TC600, QH03TZ600, LXA06T600) do not meet the minimum current requirement of the FES8JT/45 and are unsuitable for direct replacement in applications requiring full 8 A capacity.

Compliance Considerations:

The FES8JT/45 is RoHS non-compliant. All recommended active substitutes are RoHS3 compliant or RoHS compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can FES8JT-E3/45 be used as a direct replacement for FES8JT/45?

A: Yes. FES8JT-E3/45 is electrically and mechanically identical to FES8JT/45, with identical voltage (600 V), current (8 A), forward voltage (1.5 V @ 8 A), and reverse recovery time (50 ns) specifications. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between TO-220AC and TO-220-2 packages?

A: Both designations refer to the same physical Through Hole package with two leads. TO-220AC is the supplier device package designation used by some manufacturers, while TO-220-2 is the standard case designation. These are mechanically and electrically interchangeable.

Q: Can I use a higher current rated diode (9 A or 12 A) in place of the 8 A FES8JT/45?

A: Yes. Higher current rated diodes such as BYV29-600,127 (9 A) and STTH12R06DIRG (12 A) are suitable substitutes when the application operates at or below 8 A. The higher current rating provides design margin and does not negatively impact circuit performance. However, verify that forward voltage and reverse recovery time specifications are acceptable for the specific application.

Q: Why are lower current rated diodes (3 A, 6 A) listed if they cannot replace the FES8JT/45?

A: Lower current rated parts are included in the parameter comparison table for reference and to show the complete substitution landscape. These parts are not suitable as direct replacements for applications requiring the full 8 A capacity. They are listed only to clarify why they do not meet substitution criteria.

Q: What is reverse recovery time and why does it matter for substitution?

A: Reverse recovery time (trr) is the time required for a diode to stop conducting when the applied voltage reverses polarity. The FES8JT/45 specifies 50 ns. Substitute parts with similar or faster trr (such as DSEI8-06A at 50 ns, STTH12R06DIRG at 45 ns) are preferred. Parts with significantly longer trr (such as BYR29-600,127 at 75 ns) may introduce switching losses in high-frequency applications but remain electrically compatible.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All recommended active substitutes (FES8JT-E3/45, DSEI8-06A, MUR860G, MUR860-BP, BYR29-600,127, BYV29-600,127, STTH12R06DIRG) are either RoHS3 compliant or RoHS compliant. The original FES8JT/45 is RoHS non-compliant, making compliance upgrade a key benefit of substitution.

Q: What is the difference between Tube and Bulk packaging?

A: Tube packaging contains components in a plastic tube for organized storage and automated handling. Bulk packaging contains loose components. Both formats contain the same electronic component. Selection depends on assembly process requirements and inventory management practices.

Q: Can I substitute the FES8JT/45 with a part rated for lower voltage (e.g., 400 V)?

A: No. The FES8JT/45 is rated for 600 V DC reverse voltage. Substitutes must maintain this voltage rating or higher. Using a lower voltage rated diode creates risk of component failure and circuit damage under normal operating conditions.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This classification indicates the diode is a fast recovery rectifier with reverse recovery time not exceeding 500 nanoseconds when conducting currents greater than 200 milliamps. All listed substitutes meet this fast recovery classification, ensuring compatibility with switching power supply and similar high-frequency applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message