S5KBH Equivalent & Substitute Parts

Part Overview

The S5KBH is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 V DC reverse voltage and 5 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Alternative equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring 800 V rectification at comparable or lower current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitute parts for the S5KBH are classified based on the following substitution criteria:

Parametric Equivalent (Direct Substitution): Parts that match all critical electrical parameters: 800 V reverse voltage, 5 A average rectified current, DO-214AA (SMB) package, and standard recovery speed characteristics. These parts are interchangeable without circuit modification.

Similar Manufacturer Parts (Functional Substitution): Parts that maintain the 800 V reverse voltage rating and surface mount SMB/SMA package form factor but operate at reduced current ratings (1.5 A to 3 A). These parts are suitable for applications where the full 5 A current capacity is not required. Substitution requires verification that the application current demand does not exceed the substitute part's rated current.

Key Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 800 V
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Current - Average Rectified (Io): Must equal or exceed application requirement
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Operating Temperature Range: Must accommodate application requirements

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Package	Temp Range [°C]	AEC-Q101
S5KBH	Taiwan Semiconductor Corporation	800	5	1.1 @ 5 A	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes
S5KB	Taiwan Semiconductor Corporation	800	5	1.1 @ 5 A	Standard >500ns	DO-214AA (SMB)	-55 to 150	No
S3KB	Taiwan Semiconductor Corporation	800	3	1.15 @ 3 A	Standard >500ns	DO-214AA (SMB)	-55 to 150	No
S3KB-TP	Micro Commercial Co	800	3	1.15 @ 3 A	Standard >500ns	DO-214AA (SMB)	Not specified	No
S2K	Diotec Semiconductor	800	2	1.15 @ 2 A	Standard >500ns	DO-214AA (SMB)	-50 to 150	No
S2K-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5 A	Standard >500ns	DO-214AA (SMB)	-65 to 150	No
S2KA-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5 A	Standard >500ns	DO-214AC (SMA)	-65 to 150	No
S2KHE3_A/H	Vishay General Semiconductor - Diodes Division	800	1.5	1.15 @ 1.5 A	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes
RS2K-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5 A	Fast ≤500ns	DO-214AA (SMB)	-65 to 150	No
RS2KA-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5 A	Fast ≤500ns	DO-214AC (SMA)	-65 to 150	No
STTH208U	STMicroelectronics	800	2	1.65 @ 2 A	Fast ≤500ns	DO-214AA (SMB)	-40 to 175	No

Engineering Selection Recommendations

Direct Parametric Equivalent: S5KB (Taiwan Semiconductor Corporation) is the direct parametric equivalent to S5KBH, matching all electrical specifications and package requirements. Both parts are rated for 800 V, 5 A, and feature identical forward voltage characteristics. The primary distinction is that S5KBH carries AEC-Q101 automotive qualification while S5KB does not. Selection between these parts depends on whether automotive qualification is a design requirement.

Automotive-Qualified Alternatives: S2KHE3_A/H (Vishay General Semiconductor - Diodes Division) is the only substitute part that carries AEC-Q101 automotive qualification in addition to the S5KBH. This part is suitable for automotive applications requiring qualified components. However, it is rated for 1.5 A average rectified current, requiring verification that application current demand does not exceed this limit.

General-Purpose Substitutes (Non-Automotive): For applications not requiring automotive qualification, the following parts provide functional substitution at reduced current ratings:

S3KB and S3KB-TP: 3 A rating, suitable for applications requiring up to 3 A
S2K, S2K-13-F, and S2KHE3_A/H: 1.5 A to 2 A rating, suitable for lower-current applications
RS2K-13-F and RS2KA-13-F: 1.5 A rating with fast recovery characteristics

Package Considerations: S2KA-13-F and RS2KA-13-F feature DO-214AC (SMA) package instead of DO-214AA (SMB). These parts are not pin-compatible with S5KBH and require PCB layout modification.

Compliance Status: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with S5KBH environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can S5KB be used as a direct replacement for S5KBH? A: S5KB matches all electrical parameters and package specifications of S5KBH. The difference is that S5KBH carries AEC-Q101 automotive qualification while S5KB does not. If automotive qualification is not required, S5KB is a direct substitute. If automotive qualification is mandatory, S5KB is not suitable.

Q: What is the difference between S5KBH and S3KB? A: Both parts are rated for 800 V reverse voltage and feature DO-214AA (SMB) packaging. The primary difference is current rating: S5KBH is rated for 5 A average rectified current, while S3KB is rated for 3 A. S3KB can be used in applications where the maximum current requirement does not exceed 3 A. Using S3KB in a circuit designed for 5 A operation may result in component failure.

Q: Can I substitute S2KHE3_A/H for S5KBH in an automotive application? A: S2KHE3_A/H carries AEC-Q101 automotive qualification and maintains the 800 V reverse voltage rating. However, it is rated for only 1.5 A average rectified current compared to S5KBH's 5 A rating. Substitution is only valid if the application current requirement does not exceed 1.5 A.

Q: What is the difference between SMB and SMA packages? A: SMB refers to DO-214AA package and SMA refers to DO-214AC package. These are different physical packages with different pin configurations and PCB footprints. Parts specified as SMA (such as S2KA-13-F and RS2KA-13-F) are not pin-compatible with S5KBH, which uses SMB package. PCB layout modification is required for SMA substitutes.

Q: Why do some substitute parts have different forward voltage specifications? A: Forward voltage (Vf) varies by manufacturer and device design. STTH208U, for example, specifies 1.65 V @ 2 A compared to S5KBH's 1.1 V @ 5 A. Higher forward voltage results in greater power dissipation in the diode. Circuit design must account for this difference in thermal management and voltage drop calculations.

Q: What does "Standard Recovery >500ns" mean compared to "Fast Recovery ≤500ns"? A: Recovery speed refers to reverse recovery time (trr), the time required for the diode to stop conducting when reverse bias is applied. Standard recovery diodes (>500ns) are suitable for general-purpose rectification. Fast recovery diodes (≤500ns) are used in high-frequency switching applications. S5KBH uses standard recovery; fast recovery substitutes such as RS2K-13-F and STTH208U may not be suitable for all applications.

Q: Is inventory availability a factor in part selection? A: Inventory levels are provided for reference. S5KB shows 3879 pieces in stock, while S5KBH shows 716 pieces. Higher inventory availability may support supply chain continuity, but part selection must be based on electrical specifications and application requirements first.

Q: Can I use STTH208U as a substitute for S5KBH? A: STTH208U is rated for 800 V and 2 A, with fast recovery characteristics. It can substitute S5KBH only in applications where the maximum current requirement does not exceed 2 A. Additionally, STTH208U specifies forward voltage of 1.65 V @ 2 A, which is significantly higher than S5KBH's 1.1 V @ 5 A, resulting in greater power dissipation.

Q: What does AEC-Q101 qualification mean? A: AEC-Q101 is an automotive electronics qualification standard. Components carrying this qualification have undergone testing and validation for automotive applications. S5KBH and S2KHE3_A/H both carry AEC-Q101 qualification. If your application requires automotive-qualified components, only these two parts are suitable.

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