FES8ATHE3/45 Equivalent & Substitute Parts

Part Overview

The FES8ATHE3/45 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 50 V DC reverse voltage and 8 A average rectified current in a TO-220AC through-hole package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified performance parameters within acceptable application ranges.

Substiute Parts

FES8ATHE3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 914FES8ATHE3/45 Datasheet

Current PartRFQ

FES8AT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 1051FES8AT-E3/45 Datasheet

Parametric EquivalentRFQ

STPS1545DY

STMicroelectronicsIn Stock: 1453STPS1545DY Datasheet

MFR RecommendedRFQ

ER800_T0_00001

Panjit International Inc.In Stock: 1004ER800_T0_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FES8ATHE3/45 are classified into two categories based on electrical parameter alignment:

Parametric Equivalents maintain all critical electrical specifications: 50 V reverse voltage rating, 8 A average rectified current, 950 mV forward voltage drop at 8 A, 35 ns reverse recovery time, and identical thermal operating range (-55°C to 150°C). These parts differ only in product status or packaging configuration. Parametric equivalents include FES8AT-E3/45 (Vishay) and ER800_T0_00001 (Panjit International Inc.).

Manufacturer-Recommended Substitutes provide functional alternatives with modified electrical performance. The STPS1545DY (STMicroelectronics) operates at a lower reverse voltage (45 V versus 50 V), higher current rating (15 A versus 8 A), and employs Schottky technology rather than standard rectifier technology. This substitute exhibits lower forward voltage (570 mV at 15 A) and higher reverse leakage current (200 µA at 45 V). The STPS1545DY maintains identical TO-220AC package configuration and automotive-grade qualification (AEC-Q101).

Substitution eligibility is determined by: (1) identical or superior voltage rating, (2) equal or greater current capacity, (3) compatible package and mounting type, (4) matching or superior thermal range, and (5) equivalent or superior reliability certifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

FES8AT-E3/45 is the primary parametric equivalent, manufactured by Vishay General Semiconductor with active product status. This part maintains all electrical specifications of the FES8ATHE3/45 and differs only in packaging configuration (tube versus unspecified). The FES8AT-E3/45 carries ROHS3 compliance and identical thermal operating range. This part is suitable for direct substitution in applications requiring no design modification.

ER800_T0_00001 (Panjit International Inc.) provides an alternative parametric equivalent with active product status. This part matches all critical electrical parameters and maintains identical package configuration. The ER800_T0_00001 exhibits superior reverse leakage performance (1 µA versus 10 µA at 50 V), which may provide marginal benefits in low-leakage applications. This part carries ROHS3 compliance and identical thermal operating range.

For Functional Substitution (Manufacturer-Recommended Substitute):

STPS1545DY (STMicroelectronics) is classified as a manufacturer-recommended substitute with modified electrical specifications. This Schottky diode operates at 45 V reverse voltage (5 V lower than the FES8ATHE3/45) and 15 A average rectified current (7 A higher). The STPS1545DY exhibits significantly lower forward voltage drop (570 mV at 15 A versus 950 mV at 8 A), resulting in reduced power dissipation. The STPS1545DY maintains TO-220AC package compatibility and automotive-grade qualification (AEC-Q101). This substitute is applicable only in applications where the 45 V reverse voltage rating is sufficient and where the lower forward voltage drop provides system-level benefits. The STPS1545DY has obsolete product status.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the FES8ATHE3/45. Automotive-grade qualification (AEC-Q101) is confirmed for FES8ATHE3/45 and STPS1545DY; automotive grading is not specified for parametric equivalents FES8AT-E3/45 and ER800_T0_00001.

Frequently Asked Questions (FAQ)

Q: Can FES8AT-E3/45 be used as a direct replacement for FES8ATHE3/45?

A: Yes. FES8AT-E3/45 is a parametric equivalent with identical electrical specifications (50 V, 8 A, 950 mV forward voltage, 35 ns recovery time) and matching TO-220AC package configuration. The primary difference is product status (active versus obsolete) and packaging format (tube). No circuit modification is required.

Q: What is the difference between ER800_T0_00001 and FES8AT-E3/45?

A: Both are parametric equivalents with identical voltage, current, and thermal ratings. ER800_T0_00001 is manufactured by Panjit International Inc., while FES8AT-E3/45 is manufactured by Vishay General Semiconductor. ER800_T0_00001 exhibits lower reverse leakage current (1 µA versus 10 µA at 50 V). Both maintain TO-220AC package compatibility and ROHS3 compliance.

Q: Can STPS1545DY replace FES8ATHE3/45 in all applications?

A: No. STPS1545DY is a functional substitute with modified electrical specifications. The 45 V reverse voltage rating is 5 V lower than the FES8ATHE3/45, making it unsuitable for applications requiring the full 50 V rating. The STPS1545DY is applicable only in circuits where 45 V reverse voltage is sufficient. The higher current rating (15 A) and lower forward voltage drop (570 mV) may provide benefits in specific applications but do not constitute universal compatibility.

Q: Why does STPS1545DY have lower forward voltage than FES8ATHE3/45?

A: STPS1545DY employs Schottky diode technology, which inherently exhibits lower forward voltage drop compared to standard rectifier diodes. At 15 A, the STPS1545DY forward voltage is 570 mV versus 950 mV for the FES8ATHE3/45 at 8 A. This difference is a fundamental characteristic of Schottky versus standard rectifier technology.

Q: Are all substitute parts automotive-grade?

A: FES8ATHE3/45 and STPS1545DY carry automotive-grade designation with AEC-Q101 qualification. FES8AT-E3/45 and ER800_T0_00001 do not specify automotive grading in the provided data. For applications requiring automotive qualification, FES8AT-E3/45 or ER800_T0_00001 must be verified against specific automotive requirements before selection.

Q: What is the thermal operating range difference between STPS1545DY and FES8ATHE3/45?

A: FES8ATHE3/45 operates from -55°C to 150°C junction temperature. STPS1545DY operates from -40°C to 175°C junction temperature. STPS1545DY provides a wider upper temperature range (25°C higher) but a narrower lower temperature range (15°C higher minimum). Applications requiring operation below -40°C must use FES8ATHE3/45, FES8AT-E3/45, or ER800_T0_00001.

Q: Do all parts use the same TO-220AC package?

A: Yes. All substitute parts (FES8AT-E3/45, ER800_T0_00001, and STPS1545DY) use identical TO-220-2 package configuration with TO-220AC supplier device package designation. Through-hole mounting compatibility is maintained across all parts.

Q: What is the reverse leakage current difference between ER800_T0_00001 and FES8ATHE3/45?

A: ER800_T0_00001 exhibits 1 µA reverse leakage at 50 V, compared to 10 µA for FES8ATHE3/45 at the same voltage. This represents a 10-fold reduction in leakage current, which may provide marginal benefits in low-leakage or high-impedance applications.