Equivalent & Substitute Parts for RS3KB-13

Part Overview

The RS3KB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the same application category.

Substiute Parts

RS3KB-13

Diodes IncorporatedIn Stock: 4440RS3KB-13 Datasheet

Current PartRFQ

RS3KB-13-F

Diodes IncorporatedIn Stock: 15305RS3KB-13-F Datasheet

Parametric EquivalentRFQ

S3KB-TP

Micro Commercial CoIn Stock: 3903S3KB-TP Datasheet

MFR RecommendedRFQ

STTH208U

STMicroelectronicsIn Stock: 20394STTH208U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RS3KB-13 is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 800 V
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount

Secondary Matching Criteria:

• Current - Average Rectified (Io): 3 A (exact match preferred; lower ratings acceptable with design review)
• Voltage - Forward (Vf) (Max) @ If: ≤ 1.3 V @ 3 A (or equivalent rating)
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (preferred for performance continuity)

Substitute parts are grouped into two categories: parametric equivalents (identical specifications with different product status or compliance) and functional alternatives (same voltage and package with acceptable variations in current rating, forward voltage, or recovery speed).

Parameter Comparison

Engineering Selection Recommendations

RS3KB-13-F (Parametric Equivalent): RS3KB-13-F is the primary equivalent for RS3KB-13. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications: 800 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage at 3 A, and 500 ns reverse recovery time. The key distinction is product status: RS3KB-13-F is active with ROHS3 compliance, whereas the original RS3KB-13 is discontinued and RoHS non-compliant. RS3KB-13-F is available in higher inventory (15200 pcs) and is suitable for direct replacement in all applications where the original part was specified. Packaging format differs (Tape & Reel for both), ensuring compatibility with automated assembly processes.

S3KB-TP (Functional Substitute): S3KB-TP, manufactured by Micro Commercial Co, maintains the same 800 V reverse voltage and 3 A current rating in DO-214AA SMB package. Forward voltage is lower at 1.15 V @ 3 A compared to 1.3 V, providing improved efficiency characteristics. However, S3KB-TP is classified as Standard Recovery (>500ns) rather than Fast Recovery, representing a trade-off in switching speed. This part is ROHS3 compliant and active. S3KB-TP is suitable for applications where switching speed is not critical and lower forward voltage drop is beneficial. Cut Tape packaging requires manual handling or reel conversion for automated assembly.

STTH208U (Functional Substitute): STTH208U, manufactured by STMicroelectronics, provides 800 V reverse voltage in DO-214AA SMB package with Fast Recovery characteristics (75 ns reverse recovery time). The primary limitation is reduced current rating: 2 A average rectified current versus 3 A for the original part. Forward voltage is higher at 1.65 V @ 2 A. STTH208U is ROHS3 compliant, active, and available in high inventory (20300 pcs). This part is suitable only for applications where the 3 A current requirement can be reduced to 2 A or where parallel configurations are implemented. Maximum junction temperature is 175°C, exceeding the original part's 150°C rating.

Compliance and Availability Considerations: All substitute parts are ROHS3 compliant and active, addressing the discontinued status and non-compliance of the original RS3KB-13. RS3KB-13-F is the recommended first choice for direct replacement. S3KB-TP and STTH208U are secondary options requiring design verification of current and speed requirements.

Frequently Asked Questions (FAQ)

Q: Can RS3KB-13-F be used as a direct replacement for RS3KB-13?

A: Yes. RS3KB-13-F is a parametric equivalent with identical electrical specifications: 800 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage at 3 A, and 500 ns reverse recovery time. Both use DO-214AA SMB surface mount packaging. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). RS3KB-13-F is suitable for direct substitution in all applications.

Q: What is the difference between Fast Recovery and Standard Recovery classifications?

A: Fast Recovery diodes have reverse recovery time ≤ 500 ns and are optimized for high-frequency switching applications. Standard Recovery diodes have reverse recovery time > 500 ns and are suitable for lower-frequency or non-critical switching applications. RS3KB-13 and RS3KB-13-F are Fast Recovery (500 ns), while S3KB-TP is Standard Recovery. Applications requiring fast switching should use Fast Recovery parts.

Q: Can STTH208U replace RS3KB-13 in all applications?

A: STTH208U is not a direct replacement due to reduced current rating (2 A vs. 3 A). It is suitable only for applications where the circuit operates at 2 A or lower, or where multiple diodes are paralleled to achieve 3 A capacity. Verify circuit current requirements before substitution.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage (Vf) determines power dissipation in the diode. Lower Vf (S3KB-TP at 1.15 V) results in lower heat generation and improved efficiency. Higher Vf (STTH208U at 1.65 V) results in greater power loss. For applications sensitive to thermal performance or efficiency, S3KB-TP offers an advantage; however, this must be weighed against its Standard Recovery classification.

Q: Are there packaging format differences between the substitute parts?

A: Yes. RS3KB-13 and RS3KB-13-F are supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly. S3KB-TP is supplied in Cut Tape (CT) format, requiring manual handling or reel conversion. STTH208U is available in both Cut Tape (CT) and Digi-Reel® formats. Verify packaging compatibility with assembly equipment before procurement.

Q: What is the impact of RoHS compliance on part selection?

A: RS3KB-13 is RoHS non-compliant, while all substitute parts (RS3KB-13-F, S3KB-TP, STTH208U) are ROHS3 compliant. RoHS compliance is mandatory for many applications, particularly in consumer electronics and regulated industries. Use of RoHS-compliant substitutes ensures regulatory compliance and future-proofs designs against evolving environmental standards.

Q: Can S3KB-TP be used in high-frequency switching applications?

A: S3KB-TP is classified as Standard Recovery (>500ns) and is not optimized for high-frequency switching. Applications requiring fast switching response should use Fast Recovery parts such as RS3KB-13-F or STTH208U. Verify switching frequency requirements before selecting S3KB-TP.

Q: What is the maximum junction temperature rating for each part?

A: RS3KB-13 and RS3KB-13-F are rated to 150°C maximum junction temperature. S3KB-TP does not specify a maximum junction temperature in the provided data. STTH208U is rated to 175°C maximum junction temperature. For applications operating near thermal limits, STTH208U provides higher temperature margin, while S3KB-TP requires thermal analysis based on available data.