FEPB6CTHE3/81 Equivalent & Substitute Parts

Part Overview

The FEPB6CTHE3/81 is a diode array featuring a 1 Pair Common Cathode configuration rated for 150 V DC reverse voltage and 6 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in TO-263-3 (D2PAK) surface mount format with fast recovery characteristics (35 ns reverse recovery time). The part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

FEPB6CTHE3/81

Vishay General Semiconductor - Diodes DivisionIn Stock: 771FEPB6CTHE3/81 Datasheet

Current PartRFQ

STPS3150UY

STMicroelectronicsIn Stock: 42824STPS3150UY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FEPB6CTHE3/81 is constrained by the following critical parameters:

Voltage Rating: The substitute must maintain a minimum DC reverse voltage rating of 150 V to ensure equivalent electrical performance in the application circuit.

Current Rating: The substitute must support the required current levels. The FEPB6CTHE3/81 is rated for 6 A average rectified current per diode; however, substitutes with lower current ratings (such as 3 A) may be acceptable depending on actual circuit load requirements.

Reverse Recovery Time: Fast recovery characteristics (≤ 500 ns for currents > 200 mA) are specified for the main part, indicating suitability for switching applications.

Automotive Grade & AEC-Q101 Qualification: The main part carries automotive-grade qualification. Substitutes must maintain equivalent reliability and qualification standards for automotive applications.

Technology & Configuration: The main part uses Standard diode technology in a 1 Pair Common Cathode configuration. Substitutes may employ alternative technologies (such as Schottky) provided voltage and current specifications are met.

Package Compatibility: The main part uses TO-263-3 (D2PAK) surface mount packaging. Substitutes may use alternative surface mount packages (such as SMB/DO-214AA) if the application circuit layout permits.

Compliance: Both parts must maintain ROHS3 compliance and MSL Level 1 rating.

Parameter Comparison

Engineering Selection Recommendations

STPS3150UY as Substitute for FEPB6CTHE3/81:

The STPS3150UY is an active product manufactured by STMicroelectronics, providing continuity for designs requiring the obsolete FEPB6CTHE3/81. Both parts meet the following equivalence criteria:

Voltage Compatibility: Both parts are rated for 150 V DC reverse voltage, ensuring equivalent voltage performance in the application circuit.

Compliance & Qualification: Both parts carry automotive-grade classification and maintain ROHS3 compliance with MSL Level 1 rating, satisfying automotive reliability requirements.

Fast Recovery Characteristics: Both parts exhibit fast recovery switching behavior (≤ 500 ns for currents > 200 mA), suitable for switching applications.

Current Rating Consideration: The STPS3150UY is rated for 3 A average rectified current, compared to the FEPB6CTHE3/81 rated for 6 A. This represents a 50% reduction in current capacity. Selection of this substitute is appropriate only when the application circuit operates at or below 3 A per diode.

Forward Voltage Advantage: The STPS3150UY exhibits lower forward voltage (820 mV @ 3 A) compared to the main part (975 mV @ 3 A), resulting in reduced power dissipation and improved thermal performance.

Package Transition: The STPS3150UY uses SMB (DO-214AA) packaging instead of TO-263-3 (D2PAK). Circuit layout modification is required to accommodate the different package footprint.

Temperature Range: The STPS3150UY supports an extended upper operating temperature limit (175°C vs. 150°C), providing additional thermal margin in high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the STPS3150UY directly replace the FEPB6CTHE3/81 in all applications?

A: Direct replacement is possible only when the application circuit operates at or below 3 A per diode. The STPS3150UY current rating (3 A) is lower than the main part (6 A). If the circuit requires 6 A operation, the STPS3150UY is not suitable. Additionally, the package change from TO-263-3 (D2PAK) to SMB (DO-214AA) requires circuit board layout modification.

Q: What is the significance of the technology difference (Standard vs. Schottky)?

A: The main part uses Standard diode technology, while the STPS3150UY uses Schottky technology. Both technologies meet the specified fast recovery requirements. The Schottky technology in the substitute provides lower forward voltage (820 mV vs. 975 mV), reducing power dissipation. This is a functional advantage in most applications.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the FEPB6CTHE3/81 and STPS3150UY carry automotive-grade classification and AEC-Q101 qualification (where specified), meeting automotive reliability and qualification standards.

Q: What is the impact of the lower reverse leakage current in the STPS3150UY?

A: The STPS3150UY exhibits lower reverse leakage current (2 µA @ 150 V) compared to the main part (5 µA @ 150 V). Lower reverse leakage reduces standby power consumption and improves circuit efficiency, representing a functional improvement.

Q: Does the extended temperature range of the STPS3150UY affect compatibility?

A: The STPS3150UY supports an extended upper operating temperature limit (-40°C ~ 175°C) compared to the main part (-55°C ~ 150°C). The lower minimum temperature of the main part (-55°C vs. -40°C) may be significant in extreme cold-weather applications. For most automotive and industrial applications, the STPS3150UY temperature range is adequate.

Q: What packaging considerations apply when substituting the STPS3150UY?

A: The main part uses TO-263-3 (D2PAK) packaging with 2 leads plus tab, while the STPS3150UY uses SMB (DO-214AA) packaging. These packages have different footprints and pin configurations. Circuit board layout and PCB footprint must be modified to accommodate the STPS3150UY. Thermal management characteristics may differ due to package differences.

Q: Is the STPS3150UY available in production quantities?

A: The STPS3150UY is an active product with reported inventory of 42,800 pieces, ensuring availability for production requirements. The FEPB6CTHE3/81 is obsolete with limited remaining inventory (672 pieces).