FEPF6ATHE3/45 Equivalent & Substitute Parts

Part Overview

The FEPF6ATHE3/45 is a diode array rectifier manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode with 50 V reverse voltage rating and 6 A average rectified current per diode. This component is packaged in a TO-220-3 Full Pack with isolated tab for through-hole mounting applications.

The FEPF6ATHE3/45 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array configuration.

Substiute Parts

FEPF6ATHE3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 1099FEPF6ATHE3/45 Datasheet

Current PartRFQ

HER1001G C0G

Taiwan Semiconductor CorporationIn Stock: 731HER1001G C0G Datasheet

MFR RecommendedRFQ

STPS1545DY

STMicroelectronicsIn Stock: 1453STPS1545DY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FEPF6ATHE3/45 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Diode configuration (1 Pair Common Cathode)
• Voltage - DC Reverse (Vr) rating equal to or greater than 50 V
• Current - Average Rectified (Io) rating equal to or greater than 6 A per diode
• Through-hole mounting capability
• Fast recovery speed classification (≤ 500 ns, > 200 mA)
• Operating temperature range compatibility
• Compliance with automotive grade and AEC-Q101 qualification where applicable

Substitute Parts Identified:

1. HER1001G C0G (Taiwan Semiconductor Corporation) – Active product status with enhanced current rating (10 A) and matching voltage specification (50 V)

2. STPS1545DY (STMicroelectronics) – Schottky technology diode with higher current rating (15 A) and lower forward voltage drop, though with reduced reverse voltage rating (45 V)

Parameter Comparison

Engineering Selection Recommendations

HER1001G C0G Selection Criteria:

The HER1001G C0G is the primary substitute for the FEPF6ATHE3/45 based on the following factors:

• Active product status ensures ongoing availability and supply chain support
• Identical diode configuration (1 Pair Common Cathode) maintains circuit compatibility
• Matching voltage rating (50 V) provides equivalent reverse voltage protection
• Enhanced current rating (10 A versus 6 A) provides design margin and thermal headroom
• Identical operating temperature range (-55°C ~ 150°C) supports equivalent thermal performance
• ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) match the original part specifications
• Standard technology classification maintains consistent forward voltage characteristics

STPS1545DY Selection Considerations:

The STPS1545DY presents a secondary substitution option with the following characteristics:

• Schottky technology provides significantly lower forward voltage drop (570 mV @ 15 A versus 975 mV @ 3 A), resulting in reduced power dissipation
• Higher current rating (15 A) exceeds application requirements with substantial margin
• Reduced reverse voltage rating (45 V versus 50 V) requires circuit-level voltage margin analysis
• Different package configuration (TO-220-2 versus TO-220-3) necessitates PCB layout modification
• Automotive grade and AEC-Q101 qualification maintain quality and reliability standards
• Obsolete product status limits long-term supply availability

Frequently Asked Questions (FAQ)

Q: Can the HER1001G C0G directly replace the FEPF6ATHE3/45 without circuit modification?

A: The HER1001G C0G maintains identical diode configuration, voltage rating, and operating temperature range. The enhanced current rating (10 A versus 6 A) is backward compatible. Direct substitution is supported from an electrical standpoint. PCB layout compatibility should be confirmed due to potential minor package dimensional variations between manufacturers.

Q: What is the primary advantage of the STPS1545DY as a substitute?

A: The STPS1545DY employs Schottky technology, which delivers significantly lower forward voltage drop (570 mV @ 15 A) compared to the standard diode technology in the FEPF6ATHE3/45 (975 mV @ 3 A). This characteristic reduces power dissipation and heat generation in rectification applications. The higher current rating (15 A) provides additional design margin.

Q: Why does the STPS1545DY have a lower reverse voltage rating (45 V versus 50 V)?

A: The STPS1545DY is a Schottky diode, which represents a different semiconductor technology optimized for low forward voltage drop and fast switching. Schottky diodes inherently exhibit lower reverse voltage ratings compared to standard junction diodes. Circuit-level analysis is required to determine if the 45 V rating is acceptable for applications originally designed for 50 V protection.

Q: Are there package compatibility issues between the substitute parts and the original FEPF6ATHE3/45?

A: The HER1001G C0G uses a TO-220-3 package matching the original part's TO-220-3 Full Pack configuration. The STPS1545DY uses a TO-220-2 package, which has a different pin configuration and requires PCB layout modification. Pin-to-pin compatibility must be verified before selection.

Q: Do the substitute parts maintain automotive grade and AEC-Q101 qualification?

A: The HER1001G C0G does not specify automotive grade or AEC-Q101 qualification in the provided data. The STPS1545DY maintains both automotive grade and AEC-Q101 qualification, matching the original part's quality standards. Application requirements for automotive qualification should determine substitute selection.

Q: What is the impact of different reverse recovery times (trr) on circuit performance?

A: The FEPF6ATHE3/45 specifies 35 ns reverse recovery time, while the HER1001G C0G specifies 50 ns. Both parts meet the fast recovery classification (≤ 500 ns, > 200 mA). The 15 ns difference is negligible for most rectification applications. The STPS1545DY does not specify reverse recovery time in the provided data.

Q: How do reverse leakage current differences affect circuit design?

A: The FEPF6ATHE3/45 exhibits 5 µA reverse leakage at 50 V, the HER1001G C0G exhibits 10 µA at 50 V, and the STPS1545DY exhibits 200 µA at 45 V. Higher reverse leakage increases standby power consumption and heat generation. Applications with stringent leakage requirements should prioritize the FEPF6ATHE3/45 or HER1001G C0G.

Q: Is the HER1001G C0G available in sufficient inventory for production requirements?

A: The HER1001G C0G is listed as an active product with 701 pieces in new original stock. The FEPF6ATHE3/45 is obsolete with 1075 pieces in stock. Long-term supply continuity favors the HER1001G C0G due to its active product status.