SB2K-M3/5BT Equivalent & Substitute Parts

Part Overview

The SB2K-M3/5BT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 800 V DC reverse voltage with a 2 A average rectified current rating and is housed in a DO-214AA (SMB) package. The device is Active in product status and RoHS3 compliant. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when specific performance characteristics are required for application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 800 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SB2K-M3/5BT are qualified based on the following critical parameters:

Mandatory Matching Parameters:

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

Performance Characteristics Allowing Substitution:

Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Reverse Recovery Time (trr): Standard or faster recovery acceptable
Current - Reverse Leakage @ Vr: Within acceptable limits
Operating Temperature - Junction: Minimum -55°C to 150°C range

The SB2K-M3/5BT has two identified substitutes: STTH208U (manufacturer-recommended) and S2KH (parametric equivalent). Both maintain the core electrical specifications of 800 V reverse voltage and 2 A current rating in the same DO-214AA package format.

Parameter Comparison

Parameter	SB2K-M3/5BT (Vishay)	STTH208U (STMicroelectronics)	S2KH (Taiwan Semiconductor)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	1.65 V @ 2 A	1.15 V @ 2 A
Speed Classification	Standard Recovery >500ns	Fast Recovery ≤500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	2 µs	75 ns	1.5 µs
Current - Reverse Leakage @ Vr	1 µA @ 800 V	5 µA @ 800 V	1 µA @ 800 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150°C	175°C (Max)	-55 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SB2K-M3/5BT (Vishay General Semiconductor - Diodes Division)

Primary selection for applications requiring standard recovery characteristics with 2 µs reverse recovery time. Maintains forward voltage of 1.15 V at 2 A and reverse leakage of 1 µA at 800 V. Operating temperature range of -55°C to 150°C supports general industrial applications. RoHS3 compliant with MSL 1 rating. Active product status with established supply chain.

STTH208U (STMicroelectronics) - Manufacturer-Recommended Substitute

Fast recovery diode with 75 ns reverse recovery time, suitable for applications requiring reduced switching losses and improved efficiency. Forward voltage increases to 1.65 V at 2 A, resulting in higher power dissipation compared to the primary part. Reverse leakage increases to 5 µA at 800 V. Maximum junction temperature of 175°C exceeds the primary part specification. RoHS3 compliant with MSL 1 rating. Active product status with high inventory availability (20,300 pcs).

S2KH (Taiwan Semiconductor Corporation) - Parametric Equivalent

Parametric equivalent maintaining identical forward voltage (1.15 V @ 2 A) and reverse leakage (1 µA @ 800 V) characteristics to the primary part. Reverse recovery time of 1.5 µs is faster than the primary part but slower than STTH208U. Qualified to AEC-Q101 automotive standard, indicating suitability for automotive and high-reliability applications. Operating temperature range matches primary part (-55°C to 150°C). RoHS3 compliant with MSL 1 rating. Active product status with substantial inventory (6,850 pcs).

Frequently Asked Questions (FAQ)

Q: Can STTH208U be used as a direct replacement for SB2K-M3/5BT?

A: STTH208U is electrically compatible in terms of voltage and current ratings (800 V, 2 A) and uses the same DO-214AA package. However, it exhibits different performance characteristics: forward voltage increases from 1.15 V to 1.65 V, and reverse recovery time decreases from 2 µs to 75 ns. These differences affect power dissipation and switching behavior. Selection depends on application requirements for recovery speed and thermal management.

Q: What is the difference between S2KH and SB2K-M3/5BT?

A: S2KH is a parametric equivalent with matching forward voltage (1.15 V @ 2 A) and reverse leakage (1 µA @ 800 V). The primary difference is reverse recovery time: S2KH operates at 1.5 µs compared to 2 µs for SB2K-M3/5BT. S2KH includes AEC-Q101 automotive qualification, making it suitable for automotive applications. Both operate across -55°C to 150°C and use the same DO-214AA package.

Q: Are all three parts available in the same packaging format?

A: All three parts use the DO-214AA (SMB) surface mount package. However, packaging configuration differs: SB2K-M3/5BT and S2KH are supplied in Tape & Reel (TR) format, while STTH208U is available in Cut Tape (CT) and Digi-Reel® format. Verify packaging requirements for automated assembly processes.

Q: Which substitute part has the lowest forward voltage drop?

A: Both SB2K-M3/5BT and S2KH maintain a forward voltage of 1.15 V @ 2 A. STTH208U has a higher forward voltage of 1.65 V @ 2 A, resulting in increased power dissipation in the diode.

Q: Are all parts RoHS3 compliant?

A: Yes, all three parts (SB2K-M3/5BT, STTH208U, and S2KH) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level rating.

Q: What is the significance of AEC-Q101 qualification on S2KH?

A: AEC-Q101 qualification indicates that S2KH meets automotive industry reliability and quality standards. This qualification is relevant for applications in automotive, industrial, and other high-reliability environments where component traceability and performance consistency are critical.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Recovery time characteristics differ significantly among the three parts. STTH208U (75 ns) is optimized for high-frequency switching with minimal recovery losses. SB2K-M3/5BT (2 µs) and S2KH (1.5 µs) are standard recovery devices suitable for lower-frequency applications. Application frequency requirements determine appropriate part selection.

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