S3MB R5G Equivalent & Substitute Parts

Part Overview

The S3MB R5G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with acceptable parameter variations within standard rectifier diode applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	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 @ 1000 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3MB R5G is determined by the following critical parameters: reverse voltage rating (1000 V minimum), average rectified current capacity, forward voltage drop, package type (DO-214AA/SMB surface mount), and operating temperature range. Parts are grouped into three categories based on substitution relationship:

Parametric Equivalent: Parts with identical electrical specifications and the same DO-214AA package, differing only in manufacturer or internal design variant.

Direct Manufacturer Equivalent: Parts from alternative manufacturers meeting the same 1000 V / 3 A specifications in DO-214AA package, with active product status.

Similar Functional Substitute: Parts with 1000 V reverse voltage in DO-214AA package but with reduced current ratings (1.5 A or 2 A) or modified electrical characteristics, suitable for applications with lower current requirements or where forward voltage and recovery time variations are acceptable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs]	Ir @ Vr [µA]	Package	Status
S3MB R5G	Taiwan Semiconductor Corporation	1000	3	1.15 @ 3A	1.5	10 @ 1000V	DO-214AA	Discontinued
S3MBHR5G	Taiwan Semiconductor Corporation	1000	3	1.15 @ 3A	1.5	10 @ 1000V	DO-214AA	Discontinued
S3MB-TP	Micro Commercial Co	1000	3	1.15 @ 3A	—	10 @ 1000V	DO-214AA	Active
CGRB307-G	Comchip Technology	1000	3	1.1 @ 3A	—	5 @ 1000V	DO-214AA	Active
CGRB207-G	Comchip Technology	1000	2	1.1 @ 2A	—	5 @ 1000V	DO-214AA	Active
RS2M-13-F	Diodes Incorporated	1000	1.5	1.3 @ 1.5A	0.5	5 @ 1000V	DO-214AA	Active
S2M-13-F	Diodes Incorporated	1000	1.5	1.15 @ 1.5A	—	5 @ 1000V	DO-214AA	Active
S2M-LTP	Micro Commercial Co	1000	2	1.15 @ 2A	—	5 @ 1000V	DO-214AA	Active
S2MHE3_A/H	Vishay General Semiconductor	1000	1.5	1.15 @ 1.5A	2	1 @ 1000V	DO-214AA	Active
RS2MA-13-F	Diodes Incorporated	1000	1.5	1.3 @ 1.5A	0.5	5 @ 1000V	DO-214AC	Active
S2MA-13-F	Diodes Incorporated	1000	1.5	1.15 @ 1.5A	—	5 @ 1000V	DO-214AC	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The S3MB-TP from Micro Commercial Co is the primary direct substitute, maintaining 1000 V / 3 A specifications in DO-214AA package with active product status. This part is suitable for applications requiring no design modification and identical current handling capacity.

The CGRB307-G from Comchip Technology provides an alternative 1000 V / 3 A option with active status and high inventory availability (38,451 pcs). Forward voltage is marginally lower (1.1 V vs. 1.15 V), and reverse leakage is reduced (5 µA vs. 10 µA), representing improved performance characteristics within the same package and voltage class.

For Current-Limited Applications:

The S2M-LTP from Micro Commercial Co (1000 V / 2 A) and S2M-13-F from Diodes Incorporated (1000 V / 1.5 A) are suitable for designs where maximum current requirement does not exceed 2 A or 1.5 A respectively. Both maintain DO-214AA package compatibility and forward voltage specifications compatible with the original part.

The S2MHE3_A/H from Vishay General Semiconductor offers automotive-grade qualification (AEC-Q101) with 1000 V / 1.5 A rating, appropriate for applications requiring automotive-level reliability in reduced-current scenarios.

For Package-Variant Applications:

The RS2MA-13-F and S2MA-13-F are SMA package variants (DO-214AC) of 1000 V / 1.5 A diodes, applicable only where PCB layout accommodates the smaller SMA footprint and current requirement does not exceed 1.5 A.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status consistent with the original S3MB R5G.

Frequently Asked Questions (FAQ)

Q: Can the S3MB-TP directly replace the S3MB R5G without circuit modification?

A: Yes. The S3MB-TP maintains identical 1000 V / 3 A specifications, 1.15 V forward voltage, and DO-214AA package. No circuit modification is required. The part is manufactured by Micro Commercial Co and carries active product status.

Q: What is the difference between the S3MB R5G and S3MBHR5G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications (1000 V / 3 A, 1.15 V forward voltage, 1.5 µs recovery time). The S3MBHR5G is a variant designation; both are discontinued at DiGi Electronics. The S3MB-TP from Micro Commercial Co is the recommended active alternative.

Q: Can I use the CGRB307-G as a substitute?

A: Yes. The CGRB307-G provides 1000 V / 3 A operation in DO-214AA package with improved characteristics: lower forward voltage (1.1 V vs. 1.15 V) and reduced reverse leakage (5 µA vs. 10 µA). It is manufactured by Comchip Technology with active status and high availability.

Q: Why would I choose a 1.5 A or 2 A part instead of the 3 A equivalent?

A: Lower-current parts (S2M-LTP at 2 A, S2M-13-F or S2MHE3_A/H at 1.5 A) are appropriate for applications where maximum circuit current does not exceed these ratings. These parts offer cost optimization and may provide improved thermal performance in current-limited designs. All maintain 1000 V reverse voltage and DO-214AA package compatibility.

Q: What is the difference between DO-214AA and DO-214AC packages?

A: DO-214AA (SMB) and DO-214AC (SMA) are both surface mount rectifier packages with different physical dimensions. SMA is smaller than SMB. The RS2MA-13-F and S2MA-13-F are SMA variants suitable only where PCB layout accommodates the smaller footprint. Electrical specifications remain equivalent to their SMB counterparts.

Q: Is the S2MHE3_A/H suitable for automotive applications?

A: Yes. The S2MHE3_A/H carries AEC-Q101 automotive qualification and is rated for 1000 V / 1.5 A operation. It is appropriate for automotive-grade designs requiring reduced current capacity. Operating temperature range is -55°C to 150°C, matching the original S3MB R5G.

Q: What does "Discontinued at DiGi Electronics" mean for the S3MB R5G?

A: This designation indicates the part is no longer actively stocked or distributed through DiGi Electronics. Existing inventory may be available from alternative distributors, but new production orders should transition to active alternatives such as S3MB-TP or CGRB307-G to ensure long-term supply continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance, MSL 1 (unlimited moisture sensitivity level), and REACH unaffected status, consistent with the original S3MB R5G specifications.

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