S5KB Equivalent & Substitute Parts

Part Overview

The S5KB 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 and complies with RoHS3 standards. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required for design flexibility, supply chain alternatives, or specific application constraints such as package type or thermal characteristics.

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 @ 5	V @ A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	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 S5KB are identified based on the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Package / Case: DO-214AA (SMB) or compatible surface mount package
Mounting Type: Surface Mount
RoHS3 Compliance: Required
Operating Temperature Range: Minimum -55°C to 150°C junction temperature

Current Rating Considerations: Substitute parts are grouped by average rectified current (Io). Parts rated at 1.5 A, 2 A, or 3 A are listed as alternatives when the application permits operation at lower current ratings than the primary 5 A specification. Parts with lower current ratings operate within the same voltage class and package footprint, enabling direct substitution in circuits where full 5 A capacity is not required.

Recovery Speed Variations: Standard recovery (>500 ns) and fast recovery (≤500 ns) diodes are both included. Recovery speed does not prevent substitution; it reflects different switching characteristics suitable for different circuit topologies.

Package Variants: DO-214AA (SMB) and DO-214AC (SMA) packages are mechanically distinct. SMA variants (RS2KA-13-F, S2KA-13-F) are listed for applications where package footprint flexibility exists.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Package	Temp Range [°C]	RoHS3
S5KB	Taiwan Semiconductor Corporation	800	5	1.1 @ 5	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes
RS2K-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5	Fast ≤500ns	DO-214AA (SMB)	-65 to 150	Yes
RS2K-E3/52T	Vishay General Semiconductor - Diodes Division	800	1.5	1.3 @ 1.5	Fast ≤500ns	DO-214AA (SMB)	-55 to 150	Yes
RS2K-E3/5BT	Vishay General Semiconductor - Diodes Division	800	1.5	1.3 @ 1.5	Fast ≤500ns	DO-214AA (SMB)	-55 to 150	Yes
RS2KA-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5	Fast ≤500ns	DO-214AC (SMA)	-65 to 150	Yes
S2K	Diotec Semiconductor	800	2	1.15 @ 2	Standard >500ns	DO-214AA (SMB)	-50 to 150	Yes
S2K-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5	Standard >500ns	DO-214AA (SMB)	-65 to 150	Yes
S2K-E3/52T	Vishay General Semiconductor - Diodes Division	800	1.5	1.15 @ 1.5	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes
S2KA-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5	Standard >500ns	DO-214AC (SMA)	-65 to 150	Yes
S2KHE3_A/H	Vishay General Semiconductor - Diodes Division	800	1.5	1.15 @ 1.5	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes
S3KB	Taiwan Semiconductor Corporation	800	3	1.15 @ 3	Standard >500ns	DO-214AA (SMB)	-55 to 150	Yes

Engineering Selection Recommendations

Direct Substitution (Same Current Rating): No substitute parts are listed with a 5 A current rating. The S5KB operates at the highest current specification within the 800 V class. Substitution to lower current-rated parts (1.5 A, 2 A, or 3 A) is permissible only when circuit design confirms that peak and average current demands do not exceed the substitute part's rating.

Package-Compatible Substitutes (DO-214AA / SMB): Parts maintaining the DO-214AA (SMB) package footprint include S2K-13-F, S2K-E3/52T, S2KHE3_A/H, S3KB, RS2K-13-F, RS2K-E3/52T, and RS2K-E3/5BT. These are mechanically and electrically interchangeable at the PCB level without layout modification.

Package Variant Substitutes (DO-214AC / SMA): S2KA-13-F and RS2KA-13-F employ the smaller SMA package. These are suitable only when PCB footprint design accommodates the different package geometry.

Compliance and Qualification: All listed substitutes maintain RoHS3 compliance and REACH unaffected status, matching the primary part's regulatory standing. S2KHE3_A/H carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Temperature Range Considerations: Most substitutes support -55°C to 150°C or -65°C to 150°C junction temperature ranges, meeting or exceeding the S5KB specification of -55°C to 150°C.

Recovery Speed Selection: Standard recovery (>500 ns) substitutes maintain identical switching behavior to the S5KB. Fast recovery (≤500 ns) substitutes (RS2K-13-F, RS2K-E3/52T, RS2K-E3/5BT) are suitable for circuits tolerant of faster switching transients.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 1.5 A rated diode for the 5 A S5KB?

A: Substitution is permissible only if circuit analysis confirms that average rectified current and peak current demands do not exceed 1.5 A. The 800 V voltage rating remains identical. Exceeding the current rating of the substitute part results in thermal stress and reduced component life.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: DO-214AA (SMB) and DO-214AC (SMA) are distinct surface mount packages with different footprints and lead configurations. SMA packages are physically smaller. Substitution between these packages requires PCB layout modification and is not a direct drop-in replacement.

Q: Are fast recovery diodes (≤500 ns) compatible with circuits designed for standard recovery (>500 ns) diodes?

A: Fast recovery diodes are electrically compatible in circuits designed for standard recovery diodes. Faster switching may reduce switching losses in high-frequency applications but does not prevent operation in standard-recovery circuits. Verify that circuit design does not depend on specific recovery time characteristics.

Q: Does the S5KB require any special handling or storage conditions?

A: The S5KB carries Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard component storage practices apply.

Q: Can I use S3KB (3 A) as a substitute for S5KB (5 A)?

A: S3KB is suitable only if circuit design confirms that average rectified current does not exceed 3 A. The 800 V voltage rating is identical. S3KB provides lower current capacity and is not a direct replacement for 5 A applications.

Q: What compliance certifications apply to all listed substitute parts?

A: All substitute parts are RoHS3 compliant and REACH unaffected. S2KHE3_A/H additionally carries AEC-Q101 automotive qualification. Verify specific compliance requirements for your application before final part selection.

Q: Are there inventory considerations when selecting substitutes?

A: Inventory levels vary by part number and manufacturer. Consult current stock status for supply chain planning. S2KA-13-F (77,100 pcs) and S3KB (75,300 pcs) show high availability; other parts range from 2,550 to 30,200 pcs.

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