SB2K-M3/52T Equivalent & Substitute Parts

Part Overview

The SB2K-M3/52T is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 800 V DC reverse voltage with a 2 A average rectified current rating and is packaged in the DO-214AA (SMB) form factor. The device is classified as Active product status with standard recovery characteristics and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining the same functional specifications and package form factor.

Substiute Parts

SB2K-M3/52T

Vishay General Semiconductor - Diodes DivisionIn Stock: 4291SB2K-M3/52T Datasheet

Current PartRFQ

STTH208U

STMicroelectronicsIn Stock: 20394STTH208U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SB2K-M3/52T is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 800 V
• Current - Average Rectified (Io): 2 A
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max): Substitute may exceed the main part specification
• Reverse Recovery Time (trr): Substitute may be faster (lower value) than the main part
• Current - Reverse Leakage @ Vr: Substitute may exceed the main part specification
• Operating Temperature - Junction (Max): Substitute may exceed the main part specification

The STTH208U from STMicroelectronics qualifies as a substitute because it maintains identical voltage and current ratings, identical package form factor, and equivalent RoHS compliance status. Variations in forward voltage, recovery time, leakage current, and maximum junction temperature do not preclude substitution when the substitute specifications remain within acceptable design margins for the application.

Parameter Comparison

Engineering Selection Recommendations

Both the SB2K-M3/52T and STTH208U are Active product status devices with full RoHS3 compliance and REACH unaffected status, making them suitable for applications requiring regulatory compliance in restricted substance directives.

The SB2K-M3/52T features standard recovery characteristics with a 2 µs reverse recovery time and lower forward voltage drop of 1.15 V at 2 A, making it suitable for applications where power dissipation and switching speed are secondary concerns.

The STTH208U features fast recovery characteristics with a 75 ns reverse recovery time and higher forward voltage drop of 1.65 V at 2 A, making it suitable for applications requiring faster switching performance. The higher maximum junction temperature rating of 175°C provides additional thermal margin compared to the 150°C rating of the SB2K-M3/52T.

Both devices share identical voltage and current ratings (800 V, 2 A), identical package form factor (DO-214AA, SMB), and identical moisture sensitivity classification (MSL 1), ensuring mechanical and electrical compatibility in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can the STTH208U directly replace the SB2K-M3/52T in my circuit?

A: Yes. Both devices share identical voltage ratings (800 V), current ratings (2 A), and package form factor (DO-214AA, SMB). The STTH208U is electrically and mechanically compatible for direct substitution in surface mount applications.

Q: What is the difference in forward voltage drop between these devices?

A: The SB2K-M3/52T has a maximum forward voltage drop of 1.15 V at 2 A, while the STTH208U has a maximum forward voltage drop of 1.65 V at 2 A. This 0.5 V difference results in higher power dissipation in the STTH208U. Verify that thermal design accommodates this increased dissipation in your specific application.

Q: Why does the STTH208U have a much faster recovery time?

A: The STTH208U is classified as a fast recovery diode with a 75 ns reverse recovery time, compared to the standard recovery SB2K-M3/52T with a 2 µs reverse recovery time. Fast recovery diodes are optimized for switching applications and reduce switching losses. Standard recovery diodes are optimized for general-purpose rectification.

Q: Are both devices RoHS compliant?

A: Yes. Both the SB2K-M3/52T and STTH208U are RoHS3 compliant and REACH unaffected, meeting regulatory requirements for restricted substance directives.

Q: What is the difference in reverse leakage current?

A: The SB2K-M3/52T has a maximum reverse leakage current of 1 µA at 800 V, while the STTH208U has a maximum reverse leakage current of 5 µA at 800 V. Both values are within acceptable ranges for general-purpose rectifier applications.

Q: Can I use the STTH208U in a high-temperature environment?

A: The STTH208U has a maximum junction temperature rating of 175°C, compared to 150°C for the SB2K-M3/52T. The STTH208U provides 25°C additional thermal margin and is suitable for applications requiring higher temperature operation.

Q: Are the packaging formats identical?

A: Yes. Both devices use the DO-214AA (SMB) surface mount package form factor with identical pin configuration and footprint, ensuring compatibility with existing PCB layouts and assembly processes.