UG8AT-E3/45 Equivalent & Substitute Parts

Part Overview

The UG8AT-E3/45 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This component is rated for 50 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220AC package. The part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for the same application circuit topology.

Substiute Parts

UG8AT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 885UG8AT-E3/45 Datasheet

Current PartRFQ

MUR805G

onsemiIn Stock: 2344MUR805G Datasheet

MFR RecommendedRFQ

STTH802D

STMicroelectronicsIn Stock: 13958STTH802D Datasheet

MFR RecommendedRFQ

UF800_T0_00001

Panjit International Inc.In Stock: 751UF800_T0_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UG8AT-E3/45 are classified into two categories based on electrical parameter alignment:

Parametric Equivalent Classification: Parts that maintain the same voltage rating (50 V), current rating (8 A), forward voltage drop (1 V @ 8 A), and fast recovery speed characteristics. These parts are direct functional replacements with identical electrical performance within the specified operating envelope.

Manufacturer Recommended Substitute Classification: Parts that maintain the same current rating (8 A) and fast recovery speed but may differ in voltage rating, forward voltage characteristics, or reverse recovery time. These substitutes are suitable for applications where the higher voltage rating or modified electrical characteristics do not negatively impact circuit performance.

The critical parameters determining substitution eligibility are:

• Current - Average Rectified (Io): 8 A (mandatory match)
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (mandatory match)
• Mounting Type: Through Hole (mandatory match)
• Package / Case: TO-220-2 (mandatory match)
• Voltage - DC Reverse (Vr) (Max): 50 V minimum (equal or higher acceptable)
• RoHS Status: ROHS3 Compliant (mandatory match)

Parameter Comparison

Engineering Selection Recommendations

UF800_T0_00001 (Parametric Equivalent): This Panjit International Inc. component is classified as a parametric equivalent due to identical voltage and current ratings, matching forward voltage characteristics, and equivalent fast recovery speed classification. The part maintains the same operating temperature range and is ROHS3 compliant with MSL 1 rating. The UF800_T0_00001 is currently in Active product status, providing long-term availability for production and maintenance applications. The reverse recovery time of 50 ns is slightly extended compared to the main part (30 ns), which remains within acceptable fast recovery parameters. This part is suitable for direct substitution in applications requiring 50 V, 8 A rectification.

MUR805G (Manufacturer Recommended Substitute): The onsemi MUR805G maintains the 50 V voltage rating and 8 A current rating with fast recovery speed classification. This part features a slightly lower forward voltage drop (975 mV @ 8 A) compared to the main part (1 V @ 8 A), resulting in reduced power dissipation. The MUR805G operates across an extended temperature range (-65 to 175°C) and is ROHS3 compliant. However, the MUR805G is classified as Obsolete, limiting its suitability for new long-term production commitments. The reverse recovery time of 35 ns remains within fast recovery specifications.

STTH802D (Manufacturer Recommended Substitute): The STMicroelectronics STTH802D is rated for 200 V DC reverse voltage with 8 A average rectified current, providing enhanced voltage margin over the main part's 50 V rating. This component is currently in Active product status, ensuring sustained availability. The STTH802D maintains fast recovery speed classification with 30 ns reverse recovery time, matching the main part specification. Forward voltage is 1.05 V @ 8 A, within acceptable operating parameters. The extended voltage rating makes this part suitable for applications where circuit topology or future design modifications may require higher voltage withstand capability. Operating temperature range extends to 175°C maximum. This part is recommended for applications where voltage headroom is beneficial or where circuit conditions may exceed the original 50 V specification.

Frequently Asked Questions (FAQ)

Q: Can the UF800_T0_00001 be used as a direct replacement for the UG8AT-E3/45?

A: Yes. The UF800_T0_00001 is classified as a parametric equivalent with identical voltage rating (50 V), current rating (8 A), forward voltage (1 V @ 8 A), and fast recovery speed characteristics. Both parts use the TO-220-2 package with Through Hole mounting. The UF800_T0_00001 is currently in Active product status, providing superior long-term availability compared to the Obsolete UG8AT-E3/45.

Q: What is the difference between the MUR805G and the STTH802D?

A: Both parts maintain the 8 A current rating and fast recovery speed classification required for substitution. The primary difference is voltage rating: MUR805G is rated for 50 V (matching the main part), while STTH802D is rated for 200 V. The STTH802D is currently Active, while MUR805G is Obsolete. For applications operating at or below 50 V, either part is suitable; however, STTH802D provides additional voltage margin and better long-term availability.

Q: Are all substitute parts compatible with the same PCB layout and thermal management design?

A: Yes. All substitute parts use the TO-220-2 package with Through Hole mounting, maintaining identical mechanical footprint and thermal interface characteristics. PCB layout modifications are not required for substitution. Thermal management design parameters remain consistent across all listed parts.

Q: Does the reverse recovery time difference between parts affect circuit performance?

A: The reverse recovery time variations (30 ns for UG8AT-E3/45 and STTH802D, 35 ns for MUR805G, 50 ns for UF800_T0_00001) all fall within the Fast Recovery classification (≤ 500ns, > 200mA). These differences do not produce measurable performance degradation in standard rectification applications. Selection based on reverse recovery time is not a limiting factor for these substitutions.

Q: Which substitute part should be selected for new production designs?

A: The STTH802D is recommended for new production designs due to its Active product status, ensuring sustained manufacturing availability and supply chain stability. The 200 V rating provides additional design margin without performance penalty. The UF800_T0_00001 is an alternative parametric equivalent with Active status and identical electrical specifications to the original part.

Q: Are all parts RoHS3 compliant?

A: Yes. The UG8AT-E3/45 and all listed substitute parts (UF800_T0_00001, MUR805G, STTH802D) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are suitable for applications requiring environmental compliance certification.