RS3MB-13 Equivalent & Substitute Parts

Part Overview

The RS3MB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 1000 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the application category.

Substiute Parts

RS3MB-13

Diodes IncorporatedIn Stock: 753RS3MB-13 Datasheet

Current PartRFQ

RS3MB-13-F

Diodes IncorporatedIn Stock: 10367RS3MB-13-F Datasheet

Parametric EquivalentRFQ

CGRB307-G

Comchip TechnologyIn Stock: 38489CGRB307-G Datasheet

MFR RecommendedRFQ

STTH208U

STMicroelectronicsIn Stock: 20394STTH208U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the RS3MB-13 is based on the following critical parameters: voltage rating (DC reverse), current rating (average rectified), package type (Surface Mount SMB/DO-214AA), and recovery speed classification. Parts are grouped into two categories:

Parametric Equivalent: Parts that maintain all key electrical specifications (1000 V, 3 A, fast recovery ≤ 500ns) and identical package configuration. These parts are direct functional replacements with no circuit redesign required.

Functional Substitute: Parts that maintain the same package type and mounting configuration but may differ in voltage rating, current rating, or recovery speed characteristics. These parts require circuit-level verification to confirm suitability for the intended application.

The RS3MB-13-F qualifies as a parametric equivalent due to identical voltage, current, speed, and package specifications. The CGRB307-G and STTH208U are functional substitutes that share the SMB package but differ in recovery speed classification and/or current/voltage ratings.

Parameter Comparison

Engineering Selection Recommendations

RS3MB-13-F (Diodes Incorporated): This part is the primary equivalent for the RS3MB-13. It maintains identical electrical specifications (1000 V, 3 A, fast recovery 500 ns) and package configuration. The RS3MB-13-F is currently in active production status with 10,300 units in stock. This part achieves ROHS3 compliance, addressing regulatory requirements not met by the original RS3MB-13. Selection of RS3MB-13-F eliminates the need for circuit redesign and provides direct form-fit-function replacement.

CGRB307-G (Comchip Technology): This part maintains the 1000 V voltage rating and 3 A current rating in the identical SMB package. However, CGRB307-G is classified as standard recovery (>500ns) rather than fast recovery. This difference in recovery speed may affect circuit performance in high-frequency switching applications. CGRB307-G is ROHS3 compliant and maintains 38,451 units in stock. Selection requires verification that standard recovery speed is acceptable for the target application.

STTH208U (STMicroelectronics): This part is a functional substitute with reduced voltage (800 V) and current (2 A) ratings compared to the RS3MB-13. STTH208U features superior fast recovery characteristics (75 ns trr) and higher maximum junction temperature (175°C). This part is suitable only for applications where the lower voltage and current ratings are within design margins. STTH208U is ROHS3 compliant with 20,300 units in stock.

Frequently Asked Questions (FAQ)

Q: Can RS3MB-13-F be used as a direct replacement for RS3MB-13?

A: Yes. RS3MB-13-F is a parametric equivalent with identical voltage (1000 V), current (3 A), recovery speed (fast recovery ≤ 500ns), and package specifications (DO-214AA SMB). No circuit modifications are required. The primary difference is improved RoHS3 compliance status and active production availability.

Q: What is the key difference between RS3MB-13-F and CGRB307-G?

A: Both parts maintain 1000 V and 3 A ratings in the SMB package. The critical difference is recovery speed classification: RS3MB-13-F is fast recovery (≤ 500ns), while CGRB307-G is standard recovery (>500ns). Applications sensitive to switching speed or operating at high frequencies may experience performance differences. Circuit-level verification is required before substituting CGRB307-G for RS3MB-13-F.

Q: Is STTH208U suitable as a replacement for RS3MB-13?

A: STTH208U is a functional substitute only for applications where reduced voltage (800 V) and current (2 A) ratings are acceptable. The part shares the SMB package and fast recovery characteristics but does not meet the full electrical specifications of RS3MB-13. Use STTH208U only after confirming that circuit design margins accommodate the lower ratings.

Q: What packaging options are available for these substitute parts?

A: RS3MB-13-F is supplied in Cut Tape (CT) and Digi-Reel® packaging. CGRB307-G is supplied in Tape & Reel (TR) packaging. STTH208U is supplied in Cut Tape (CT) and Digi-Reel® packaging. All parts use the identical DO-214AA (SMB) surface mount package configuration, ensuring mechanical compatibility on PCB layouts.

Q: Are all substitute parts RoHS compliant?

A: RS3MB-13-F, CGRB307-G, and STTH208U are all ROHS3 compliant. The original RS3MB-13 is RoHS non-compliant. Selection of any substitute part addresses RoHS compliance requirements for new designs or production transitions.

Q: What is the inventory status for each part?

A: RS3MB-13-F has 10,300 units in stock. CGRB307-G has 38,451 units in stock. STTH208U has 20,300 units in stock. All substitute parts are currently in active production status, ensuring long-term availability compared to the discontinued RS3MB-13.