MURB820 Equivalent & Substitute Parts

Part Overview

The MURB820 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200 V DC reverse voltage and 8 A average rectified current. The device is packaged in a Surface Mount TO-263AB (D2PAK) configuration and features fast recovery characteristics with a reverse recovery time of 35 ns. The MURB820 is classified as obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Substiute Parts

MURB820

Vishay General Semiconductor - Diodes DivisionIn Stock: 3488MURB820 Datasheet

Current PartRFQ

VS-MURB820-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 5370VS-MURB820-M3 Datasheet

Parametric EquivalentRFQ

STTH802G-TR

STMicroelectronicsIn Stock: 1981STTH802G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MURB820 are qualified based on strict electrical and mechanical parameter matching within the rectifier diode category. The substitution criteria are defined by the following parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): 8 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Surface Mount
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Within standard rectifier diode tolerances
• Reverse Recovery Time (trr): Faster recovery times are acceptable
• Current - Reverse Leakage @ Vr: Minor variations within specification
• Operating Temperature - Junction (Max): Equal or higher maximum ratings are acceptable

Substitute parts must maintain identical reverse voltage and average rectified current ratings, identical package configuration, and equivalent fast recovery speed classification. Forward voltage, reverse recovery time, and reverse leakage current may vary within acceptable engineering tolerances for rectifier diode applications.

Parameter Comparison

Engineering Selection Recommendations

VS-MURB820-M3 (Vishay General Semiconductor - Diodes Division)

The VS-MURB820-M3 is a parametric equivalent to the MURB820, maintaining identical electrical specifications including 200 V reverse voltage, 8 A average rectified current, 975 mV forward voltage at 8 A, and 35 ns reverse recovery time. This part is manufactured by the same supplier as the original MURB820 and is classified as active product status. The VS-MURB820-M3 achieves ROHS3 compliance, addressing regulatory requirements that the obsolete MURB820 does not meet. Inventory availability is 5357 pieces. This substitute is suitable for direct replacement in applications requiring identical electrical performance and compliance with modern environmental standards.

STTH802G-TR (STMicroelectronics)

The STTH802G-TR is a manufacturer-recommended equivalent offering 200 V reverse voltage and 8 A average rectified current in the same TO-263AB (D2PAK) package. This part exhibits improved reverse recovery time of 30 ns compared to the MURB820's 35 ns, resulting in faster switching characteristics. Forward voltage is specified at 1.05 V @ 8 A, representing a 75 mV increase over the MURB820. Reverse leakage current is 6 µA @ 200 V, a 1 µA increase from the original specification. The STTH802G-TR is classified as active product status with ROHS3 compliance. Inventory availability is 1966 pieces. This substitute is suitable for applications where improved reverse recovery time is beneficial and the minor increases in forward voltage and reverse leakage current are within acceptable operating margins.

Frequently Asked Questions (FAQ)

Q: Can the VS-MURB820-M3 be used as a direct replacement for the MURB820?

A: Yes. The VS-MURB820-M3 maintains identical electrical specifications for reverse voltage (200 V), average rectified current (8 A), forward voltage (975 mV @ 8 A), and reverse recovery time (35 ns). Both devices use the same TO-263AB (D2PAK) package configuration. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What are the differences between the STTH802G-TR and the MURB820?

A: The STTH802G-TR maintains the same reverse voltage (200 V) and average rectified current (8 A) ratings and package configuration. The STTH802G-TR features a faster reverse recovery time of 30 ns compared to 35 ns in the MURB820. Forward voltage is 1.05 V @ 8 A versus 975 mV @ 8 A in the MURB820, representing a 75 mV increase. Reverse leakage current is 6 µA @ 200 V versus 5 µA @ 200 V in the MURB820.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. The MURB820, VS-MURB820-M3, and STTH802G-TR all use the TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package configuration. PCB footprints and land patterns are identical across all three parts.

Q: Which substitute should be selected for new designs?

A: For new designs requiring identical electrical performance to the MURB820, the VS-MURB820-M3 is the preferred substitute, as it maintains all original specifications while offering active product status and ROHS3 compliance. The STTH802G-TR is suitable for applications where the improved reverse recovery time (30 ns) provides design benefits and the increased forward voltage and reverse leakage current are acceptable.

Q: What is the significance of the reverse recovery time difference between the STTH802G-TR and the MURB820?

A: The STTH802G-TR features a reverse recovery time of 30 ns compared to 35 ns in the MURB820. Faster reverse recovery time reduces switching losses and improves efficiency in high-frequency switching applications. The 5 ns difference is within the fast recovery classification for both devices.

Q: Are there packaging differences between the substitute parts?

A: The MURB820 packaging is not specified. The VS-MURB820-M3 is supplied in Tube packaging. The STTH802G-TR is supplied in Cut Tape (CT) & Digi-Reel® packaging. These packaging differences affect handling and assembly processes but do not impact electrical compatibility or PCB mounting.

Q: What is the impact of the forward voltage difference in the STTH802G-TR?

A: The STTH802G-TR forward voltage is 1.05 V @ 8 A compared to 975 mV @ 8 A in the MURB820, representing a 75 mV increase. This results in slightly higher power dissipation in the diode. For most general-purpose rectifier applications, this difference is within acceptable operating margins. Applications with tight thermal budgets should evaluate the impact on overall circuit performance.

Q: Are all three parts RoHS compliant?

A: The MURB820 is RoHS non-compliant. Both the VS-MURB820-M3 and STTH802G-TR are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.