FEPB6DTHE3/81 Equivalent & Substitute Parts

Part Overview

The FEPB6DTHE3/81 is a diode array rectifier manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode design with 200 V DC reverse voltage rating and 6 A average rectified current per diode. The component is housed in a TO-263-3 D2PAK surface mount package and is qualified to AEC-Q101 automotive standards.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to support ongoing production requirements, design updates, and supply chain continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while preserving the common cathode diode array configuration and D2PAK package format.

Key Parameters

Parameter	FEPB6DTHE3/81 Specification
Diode Configuration	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io) (per Diode)	6 A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 3 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V
Operating Temperature - Junction	-55°C ~ 150°C
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FEPB6DTHE3/81 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Diode Configuration: Must be 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): Must be ≥ 200 V
Current - Average Rectified (Io) (per Diode): Must be ≥ 6 A
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Must be Surface Mount
Speed Classification: Must be Fast Recovery ≤ 500 ns, > 200 mA (Io)

Substitution Logic:

Substitute parts are grouped into three categories based on current rating capacity:

Direct Current Match (6 A): Parts with 5 A or 6 A ratings that operate within the same thermal and electrical envelope as the original component.
Higher Current Capacity (8 A - 10 A): Parts with elevated current ratings that maintain 200 V reverse voltage and fast recovery characteristics. These provide enhanced current handling while preserving all other critical parameters.
Maximum Current Capacity (20 A): Parts with the highest current ratings in the D2PAK package family, suitable for applications requiring increased current margin.

All substitute parts listed maintain AEC-Q101 automotive qualification, ROHS3 compliance, and surface mount D2PAK packaging. Reverse recovery time, forward voltage characteristics, and reverse leakage current specifications vary within acceptable ranges for fast recovery diode arrays.

Parameter Comparison

Parameter	FEPB6DTHE3/81	SBR10200CTB-13-G	MURB1620CTT4G	FFB20UP20DN-F085	SBR20A200CTB-13	SBR40U200CTB-13
Manufacturer	Vishay	Diodes Inc.	onsemi	onsemi	Diodes Inc.	Diodes Inc.
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V	200 V	200 V
Current - Average Rectified (Io) (per Diode)	6 A	5 A	8 A	10 A	10 A	20 A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 3 A	920 mV @ 5 A	975 mV @ 8 A	1.15 V @ 10 A	960 mV @ 20 A	930 mV @ 20 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA
Reverse Recovery Time (trr)	35 ns	20 ns	35 ns	40 ns	30 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	10 µA @ 200 V	100 µA @ 200 V	200 µA @ 200 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - Direct Electrical Match:

SBR10200CTB-13-G (Diodes Incorporated) is the primary substitute for the FEPB6DTHE3/81. This part maintains a 5 A current rating, which is within the operational envelope of the original 6 A specification. The SBR10200CTB-13-G is an active product with AEC-Q101 qualification, ROHS3 compliance, and identical D2PAK packaging. The Super Barrier technology provides superior reverse recovery time (20 ns versus 35 ns) and lower forward voltage characteristics. Extended operating temperature range (-65°C to 175°C) provides additional thermal margin compared to the original -55°C to 150°C specification.

Secondary Substitute - Enhanced Current Capacity:

MURB1620CTT4G (onsemi) provides 8 A current capacity with matching 200 V reverse voltage and identical reverse recovery time (35 ns) to the original component. This part is active, AEC-Q101 qualified, and ROHS3 compliant. The SWITCHMODE™ series designation indicates optimization for switching applications. Extended temperature range (-65°C to 175°C) and identical forward voltage specification (975 mV @ 8 A) make this suitable for direct replacement with increased current margin.

Tertiary Substitute - Maximum Current Capacity:

FFB20UP20DN-F085 (onsemi) and SBR40U200CTB-13 (Diodes Incorporated) provide 10 A and 20 A current ratings respectively. Both maintain 200 V reverse voltage, D2PAK packaging, AEC-Q101 qualification, and ROHS3 compliance. These parts are suitable for applications requiring higher current handling capacity while preserving all critical electrical and mechanical parameters.

Compliance Status:

All substitute parts listed are active products with current manufacturing support. All maintain automotive-grade qualification (AEC-Q101) and ROHS3 compliance, ensuring regulatory and supply chain continuity. The FEPB6DTHE3/81 obsolete status necessitates transition to one of these active alternatives.

Frequently Asked Questions (FAQ)

Q: Can SBR10200CTB-13-G directly replace FEPB6DTHE3/81 in existing designs?

A: Yes. SBR10200CTB-13-G maintains identical voltage (200 V), package (TO-263-3 D2PAK), and diode configuration (1 Pair Common Cathode) specifications. The 5 A current rating is within the operational range of the original 6 A specification. Extended temperature range and improved reverse recovery time provide additional design margin.

Q: What is the difference between the substitute parts in terms of current capacity?

A: Substitute parts are available in three current ratings: 5 A (SBR10200CTB-13-G), 8 A (MURB1620CTT4G), 10 A (FFB20UP20DN-F085, SBR20A200CTB-13), and 20 A (SBR40U200CTB-13). Selection depends on application current requirements. Higher-rated parts provide additional current margin while maintaining identical voltage and package specifications.

Q: Are all substitute parts automotive qualified?

A: Yes. All substitute parts listed carry AEC-Q101 automotive qualification and ROHS3 compliance, matching the original component's grade and regulatory status.

Q: What is the significance of the D2PAK package designation?

A: D2PAK (TO-263-3) is a surface mount package with 2 leads plus a thermal tab. All substitute parts use identical D2PAK packaging, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Q: How do Super Barrier technology diodes differ from standard technology diodes?

A: Super Barrier diodes (SBR® series from Diodes Incorporated) exhibit lower forward voltage drop and faster reverse recovery time compared to standard technology diodes. SBR10200CTB-13-G demonstrates 20 ns reverse recovery time versus 35 ns for the original FEPB6DTHE3/81, resulting in reduced switching losses and improved efficiency.

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

A: Reverse recovery time (trr) is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Shorter recovery times reduce switching losses and electromagnetic interference in high-frequency applications. Substitute parts range from 20 ns to 50 ns, all within fast recovery classification.

Q: Can higher-rated current parts be used in applications designed for 6 A?

A: Yes. Parts with higher current ratings (8 A, 10 A, 20 A) are electrically compatible with applications designed for 6 A operation. Higher ratings provide additional current margin and thermal headroom without affecting circuit functionality. All substitute parts maintain identical voltage specifications and D2PAK packaging.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. All substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with the original component.

Q: Are there packaging format differences among substitute parts?

A: All substitute parts use TO-263-3 D2PAK surface mount packaging. Packaging variations exist only in supplier delivery format (Tube, Tape & Reel, Cut Tape & Digi-Reel®), which does not affect component electrical or mechanical specifications.

Q: What is the operating temperature range significance?

A: The FEPB6DTHE3/81 operates from -55°C to 150°C junction temperature. Most substitute parts extend this range to -65°C to 175°C, providing wider thermal operating margin. Extended temperature range supports applications in extreme environmental conditions without performance degradation.

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