FEP6ATHE3/45 Equivalent & Substitute Parts

Part Overview

The FEP6ATHE3/45 is a diode array featuring one pair common cathode configuration rated for 50 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-220-3 through-hole format and qualifies for automotive applications under AEC-Q101 standard.

The FEP6ATHE3/45 is classified as obsolete. 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

FEP6ATHE3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 965FEP6ATHE3/45 Datasheet

Current PartRFQ

SR2050PTHC0G

Taiwan Semiconductor CorporationIn Stock: 997SR2050PTHC0G Datasheet

MFR RecommendedRFQ

STPS1545DY

STMicroelectronicsIn Stock: 1453STPS1545DY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FEP6ATHE3/45 is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode configuration (1 Pair Common Cathode)
• Voltage rating (50 V DC reverse minimum)
• Current rating (6 A average rectified minimum per diode)
• Fast recovery speed characteristic (≤ 500 ns)
• Through-hole mounting capability
• Automotive grade with AEC-Q101 qualification
• Operating temperature range compatibility (-55°C ~ 150°C minimum)

Substitution Logic: Parts meeting or exceeding all primary criteria are classified as functional equivalents. Parts with higher current ratings, improved forward voltage characteristics, or enhanced reverse leakage performance are acceptable substitutes provided they maintain the same diode configuration, voltage rating, and mounting type. Package variations within the TO-220 family are permissible when mechanical fit and thermal characteristics remain compatible with the original application.

Parameter Comparison

Engineering Selection Recommendations

SR2050PTHC0G (Taiwan Semiconductor Corporation): This substitute is classified as the primary equivalent. It maintains identical diode configuration (1 Pair Common Cathode), voltage rating (50 V), and operating temperature range (-55°C ~ 150°C). The part exceeds the current rating requirement at 20 A versus 6 A, providing design margin. Both parts carry automotive grade designation with AEC-Q101 qualification and ROHS3 compliance. The SR2050PTHC0G is currently in active production status, ensuring long-term availability. Package variation from TO-220-3 to TO-247-3 requires mechanical verification for PCB layout compatibility and thermal management considerations.

STPS1545DY (STMicroelectronics): This substitute presents a partial alternative with significant limitations. While it maintains fast recovery speed, automotive grade, AEC-Q101 qualification, and ROHS3 compliance, it differs in critical parameters. The STPS1545DY is a single diode (not a common cathode pair), operates at 45 V maximum reverse voltage (below the 50 V requirement), and uses TO-220-2 package (two leads versus three). The part is classified as obsolete. This substitute is not recommended for direct replacement in applications requiring the specific 1 Pair Common Cathode configuration at 50 V rating.

Frequently Asked Questions (FAQ)

Q: Can the SR2050PTHC0G directly replace the FEP6ATHE3/45 in existing PCB designs?

A: The SR2050PTHC0G maintains functional equivalence in diode configuration, voltage rating, and electrical performance. However, the package change from TO-220-3 to TO-247-3 requires PCB layout verification. The TO-247-3 package has different lead spacing and thermal characteristics. Mechanical fit, lead hole positioning, and thermal management must be evaluated before implementation.

Q: What is the significance of the diode configuration difference between FEP6ATHE3/45 and STPS1545DY?

A: The FEP6ATHE3/45 features a 1 Pair Common Cathode configuration, meaning two diodes share a common cathode terminal within a single package. The STPS1545DY is a single diode device. This fundamental difference affects circuit topology and pin connections. Direct substitution is not possible without circuit redesign.

Q: Why does the SR2050PTHC0G have higher reverse leakage current (500 µA) compared to the FEP6ATHE3/45 (5 µA)?

A: Reverse leakage current variation is a characteristic difference between manufacturing processes and diode technologies used by different manufacturers. The SR2050PTHC0G's higher leakage remains within acceptable automotive-grade specifications. Applications sensitive to leakage current performance must evaluate this parameter against specific design requirements.

Q: Are all substitute parts automotive qualified?

A: Yes. Both SR2050PTHC0G and STPS1545DY carry automotive grade designation with AEC-Q101 qualification, matching the FEP6ATHE3/45 specification. All three parts are ROHS3 compliant and suitable for automotive applications.

Q: What is the impact of the voltage rating difference between FEP6ATHE3/45 (50 V) and STPS1545DY (45 V)?

A: The STPS1545DY operates at a maximum reverse voltage of 45 V, which is below the 50 V requirement of the FEP6ATHE3/45. This represents a voltage derating that may not be acceptable in applications designed for 50 V operation. The SR2050PTHC0G maintains the 50 V rating and is the appropriate substitute for voltage-critical applications.

Q: How does the current rating difference affect substitution decisions?

A: The FEP6ATHE3/45 is rated for 6 A average rectified current per diode. Both substitute parts exceed this rating (SR2050PTHC0G at 20 A, STPS1545DY at 15 A). Higher current ratings provide design margin and thermal headroom. Substitution with higher-rated parts is acceptable from a current capacity perspective, provided thermal management and package considerations are addressed.

Q: What is the operating temperature range compatibility?

A: The FEP6ATHE3/45 operates from -55°C to 150°C. The SR2050PTHC0G matches this range exactly. The STPS1545DY extends to 175°C maximum, providing additional thermal margin. Both substitutes are compatible with the original part's temperature specifications.