S3KB Equivalent & Substitute Parts Reference

Part Overview

The S3KB is a general-purpose rectifier diode manufactured by onsemi, rated for 800 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part operates across a junction temperature range of -55°C to 150°C and carries automotive-grade qualification under AEC-Q101. Identification of equivalent substitute parts is necessary for applications requiring continued supply or design migration to active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3KB is constrained by the following critical parameters:

Voltage Rating: All substitute parts must maintain 800 V DC reverse voltage rating to ensure equivalent electrical performance in the application circuit.

Current Rating: The S3KB is rated for 3 A average rectified current. Substitute parts with lower current ratings (1.5 A) represent downrated alternatives and are suitable only for applications where the actual operating current does not exceed the substitute part's rating.

Package Compatibility: The S3KB uses DO-214AA (SMB) surface mount packaging. Substitutes must use identical or mechanically compatible packages to maintain PCB layout integrity. The RS2KA-13-F uses DO-214AC (SMA) packaging and is not mechanically interchangeable.

Recovery Characteristics: The S3KB exhibits standard recovery behavior (>500 ns). Substitute parts with fast recovery characteristics (≤500 ns) offer improved switching performance but remain electrically compatible.

Automotive Qualification: The S3KB carries AEC-Q101 automotive qualification. Substitute parts RS2KHE3_A/H and RS2KHE3_A/I maintain this qualification; non-qualified alternatives are suitable for non-automotive applications only.

Product Status: The S3KB is not recommended for new designs. Active substitute parts from Diodes Incorporated and Vishay General Semiconductor provide continued design support and supply assurance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Status	AEC-Q101
S3KB	onsemi	800	3	1.15 @ 3	1.5 µs	10 @ 800	DO-214AA	-55 to 150	Not For New Designs	Yes
RS2K-13-F	Diodes Inc.	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-65 to 150	Active	No
RS2K-E3/52T	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	No
RS2K-E3/5BT	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	No
RS2K-M3/52T	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	No
RS2K-M3/5BT	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	No
RS2KA-13-F	Diodes Inc.	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AC	-65 to 150	Active	No
RS2KHE3_A/H	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	Yes
RS2KHE3_A/I	Vishay	800	1.5	1.3 @ 1.5	500 ns	5 @ 800	DO-214AA	-55 to 150	Active	Yes
S2K-13-F	Diodes Inc.	800	1.5	1.15 @ 1.5	>500 ns	5 @ 800	DO-214AA	-65 to 150	Active	No
S2K-E3/52T	Vishay	800	1.5	1.15 @ 1.5	2 µs	1 @ 800	DO-214AA	-55 to 150	Active	No

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The RS2KHE3_A/H and RS2KHE3_A/I (both Vishay General Semiconductor) are the only active substitute parts that maintain automotive-grade qualification and AEC-Q101 certification. These parts are rated for 1.5 A and are suitable for applications where the operating current does not exceed this rating. Both parts use DO-214AA packaging and operate across -55°C to 150°C, matching the S3KB thermal envelope.

For Non-Automotive Applications with Current Derating:

The S2K-13-F (Diodes Incorporated) and S2K-E3/52T (Vishay) provide active alternatives with standard recovery characteristics matching the S3KB's recovery profile. These parts are rated for 1.5 A and require verification that application current does not exceed this limit. Both maintain 800 V reverse voltage rating and DO-214AA packaging.

For Fast Recovery Applications:

The RS2K-13-F, RS2K-E3/52T, RS2K-E3/5BT, RS2K-M3/52T, and RS2K-M3/5BT all provide fast recovery characteristics (≤500 ns) with 1.5 A current rating. These parts are suitable for applications requiring improved switching performance at reduced current levels.

Package Compatibility Constraint:

The RS2KA-13-F uses DO-214AC (SMA) packaging and is not mechanically interchangeable with the S3KB. This part is excluded from direct substitution unless PCB redesign is acceptable.

Current Rating Consideration:

All identified substitute parts are rated for 1.5 A, representing a 50% reduction from the S3KB's 3 A rating. Substitution is valid only when application operating current remains below 1.5 A. Applications requiring full 3 A capacity have no direct active substitutes and require design modification or continued use of legacy inventory.

Frequently Asked Questions (FAQ)

Q: Can the RS2KHE3_A/H directly replace the S3KB in automotive applications?

A: Yes, for applications where operating current does not exceed 1.5 A. The RS2KHE3_A/H maintains 800 V reverse voltage rating, AEC-Q101 automotive qualification, DO-214AA packaging, and -55°C to 150°C operating temperature range. The primary difference is the reduced current rating (1.5 A versus 3 A).

Q: What is the difference between S2K-13-F and RS2K-13-F?

A: Both parts are rated for 800 V and 1.5 A in DO-214AA packaging. The S2K-13-F exhibits standard recovery characteristics (>500 ns) with forward voltage of 1.15 V @ 1.5 A. The RS2K-13-F exhibits fast recovery characteristics (≤500 ns) with forward voltage of 1.3 V @ 1.5 A. Selection depends on application switching speed requirements.

Q: Why is the RS2KA-13-F not recommended as a substitute?

A: The RS2KA-13-F uses DO-214AC (SMA) packaging, which is mechanically different from the S3KB's DO-214AA (SMB) package. Direct PCB substitution is not possible without component footprint redesign.

Q: Can I use a 1.5 A rated part in place of the 3 A S3KB?

A: Substitution is valid only if the application's actual operating current does not exceed 1.5 A. The circuit must be analyzed to confirm that peak and average rectified currents remain below the substitute part's rating. Exceeding the rated current will result in component failure.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts carry ROHS3 compliance status, matching the S3KB's environmental compliance profile.

Q: What is the difference between Vishay parts with different packaging codes (E3/52T, E3/5BT, M3/52T, M3/5BT)?

A: These designations indicate different packaging formats and tape configurations. E3/52T and E3/5BT are Cut Tape (CT) variants, while M3/52T and M3/5BT are Tape & Reel (TR) variants. Electrical specifications are identical; selection depends on procurement and assembly requirements.

Q: Does the S3KB have any active direct replacements rated for 3 A?

A: No active substitute parts are available with 3 A current rating and 800 V reverse voltage in DO-214AA packaging. All identified active alternatives are rated for 1.5 A maximum.

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