UG15HT-E3/45 Equivalent & Substitute Parts

Part Overview

The UG15HT-E3/45 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 500 V DC reverse voltage and 15 A average rectified current in a Through Hole TO-220AC package. This component is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts listed below maintain functional compatibility within specified electrical and mechanical parameters while offering active product status and improved availability.

Substiute Parts

UG15HT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 1073UG15HT-E3/45 Datasheet

Current PartRFQ

VS-ETH1506-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 718VS-ETH1506-M3 Datasheet

MFR RecommendedRFQ

STTH15AC06CT

STMicroelectronicsIn Stock: 3069STTH15AC06CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UG15HT-E3/45 are selected based on the following criteria:

Primary Substitution Parameters:

• Mounting Type: Through Hole (maintained across all substitutes)
• Package / Case: TO-220 family (TO-220-2 or TO-220-3)
• Current - Average Rectified (Io): 15 A or greater per diode element
• Voltage - DC Reverse (Vr) (Max): 500 V or greater
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant (maintained)
• Moisture Sensitivity Level: 1 (Unlimited) (maintained)

Substitution Logic: Substitute parts must maintain or exceed the reverse voltage rating and current capacity of the original part. Forward voltage characteristics, reverse recovery time, and reverse leakage current are secondary parameters that may vary within acceptable operating ranges. All substitutes are active products with current manufacturing status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

VS-ETH1506-M3 (Vishay General Semiconductor - Diodes Division): This substitute is the manufacturer-recommended equivalent. It maintains identical current rating (15 A) and package configuration (TO-220-2) while providing enhanced voltage rating (600 V vs. 500 V). The part is Active status with extended operating temperature range (-65°C to 175°C). Forward voltage is higher at 2.45 V @ 15 A, and reverse recovery time is improved at 29 ns. This part is suitable for direct replacement in applications where the higher voltage rating and improved recovery characteristics provide design margin. ROHS3 compliance and MSL 1 rating are maintained.

STTH15AC06CT (STMicroelectronics): This substitute is a diode array configuration (1 Pair Common Cathode) in TO-220-3 package. It provides 600 V reverse voltage rating with 7.5 A per diode element. The TO-220-3 package requires three-pin PCB footprint accommodation compared to the two-pin TO-220-2 of the original part. Forward voltage is 1.9 V @ 7.5 A, and reverse leakage is significantly lower at 1 µA @ 600 V. This part is Active status with operating temperature range of -40°C to 150°C. ROHS3 compliance and MSL 1 rating are maintained. Selection of this part requires verification of PCB layout compatibility due to package pin configuration difference.

Both substitutes maintain Fast Recovery speed classification and ROHS3 compliance. Selection between substitutes depends on specific application requirements regarding package footprint, voltage margin, and thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can the VS-ETH1506-M3 be used as a direct replacement for the UG15HT-E3/45?

A: Yes. The VS-ETH1506-M3 maintains the same current rating (15 A), mounting type (Through Hole), and package configuration (TO-220-2). The higher voltage rating (600 V vs. 500 V) provides additional design margin. Forward voltage and reverse recovery time differ but remain within Fast Recovery classification. PCB layout and thermal design do not require modification.

Q: What is the primary difference between the two substitute parts?

A: The VS-ETH1506-M3 is a single diode in TO-220-2 package, while the STTH15AC06CT is a diode array (1 Pair Common Cathode) in TO-220-3 package. The STTH15AC06CT has lower current per diode element (7.5 A vs. 15 A) and requires a three-pin footprint instead of two-pin. The STTH15AC06CT offers significantly lower reverse leakage current (1 µA vs. 30 µA at original part).

Q: Is the STTH15AC06CT suitable for applications requiring 15 A continuous current?

A: The STTH15AC06CT is rated for 7.5 A per diode element in a common cathode configuration. Applications requiring 15 A continuous current would require parallel connection of both diode elements or selection of an alternative part rated for 15 A single element.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both substitute parts (VS-ETH1506-M3 and STTH15AC06CT) are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original UG15HT-E3/45.

Q: What is the impact of higher forward voltage in the VS-ETH1506-M3?

A: The VS-ETH1506-M3 has forward voltage of 2.45 V @ 15 A compared to 1.75 V @ 15 A for the original part. This 0.7 V increase results in higher power dissipation in the diode. Thermal design and heat sink calculations should account for this difference in applications with continuous high current operation.

Q: Can the UG15HT-E3/45 be replaced with the STTH15AC06CT in existing PCB designs?

A: The STTH15AC06CT requires a TO-220-3 footprint (three pins) compared to the TO-220-2 footprint (two pins) of the original part. PCB layout modification is necessary. Additionally, the common cathode configuration requires circuit design review to ensure proper connection of both diode elements for the intended application.

Q: What is the advantage of the improved reverse recovery time in the VS-ETH1506-M3?

A: The VS-ETH1506-M3 has reverse recovery time of 29 ns compared to 50 ns for the original part. Faster recovery reduces switching losses and electromagnetic interference in high-frequency switching applications. This improvement is particularly beneficial in power supply and inverter circuits operating at elevated switching frequencies.