S3MBHR5G Equivalent & Substitute Parts

Part Overview

The S3MBHR5G 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 production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with minor parameter variations within acceptable operating ranges.

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°C ~ 150°C	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3MBHR5G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 1000 V minimum to ensure equivalent blocking capability.

Current Rating: The primary distinction between substitute groups is the average rectified current (Io). The S3MBHR5G is rated for 3 A. Substitutes are grouped as follows:

Full Current Equivalents (3 A): Parts rated for 3 A at identical forward voltage specifications
Reduced Current Substitutes (1.5 A – 2 A): Parts with lower current ratings suitable for applications with reduced current demands

Package Compatibility: All listed substitutes use the DO-214AA (SMB) or DO-214AC (SMA) surface mount packages, maintaining mechanical compatibility with standard PCB layouts.

Forward Voltage: Forward voltage drop at rated current affects power dissipation. Substitutes with forward voltage specifications of 1.1 V to 1.3 V at their respective current ratings are functionally compatible.

Recovery Characteristics: Standard recovery (>500 ns) and fast recovery (≤500 ns) diodes are both acceptable, as recovery speed does not prevent functional substitution in general-purpose rectification applications.

Compliance: All substitutes maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring environmental and manufacturing compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Package	Status
S3MBHR5G	Taiwan Semiconductor Corporation	1000 V	3 A	1.15 V @ 3 A	1.5 µs	DO-214AA (SMB)	Discontinued
S3MB R5G	Taiwan Semiconductor Corporation	1000 V	3 A	1.15 V @ 3 A	1.5 µs	DO-214AA (SMB)	Discontinued
CGRB307-G	Comchip Technology	1000 V	3 A	1.1 V @ 3 A	—	DO-214AA (SMB)	Active
S3MB-TP	Micro Commercial Co	1000 V	3 A	1.15 V @ 3 A	—	DO-214AA (SMB)	Active
NRVS3MB	onsemi	1000 V	3 A	1.15 V @ 3 A	1.5 µs	DO-214AA (SMB)	Not For New Designs
CGRB207-G	Comchip Technology	1000 V	2 A	1.1 V @ 2 A	—	DO-214AA (SMB)	Active
S2M-LTP	Micro Commercial Co	1000 V	2 A	1.15 V @ 2 A	—	DO-214AA (SMB)	Active
RS2M-13-F	Diodes Incorporated	1000 V	1.5 A	1.3 V @ 1.5 A	500 ns	DO-214AA (SMB)	Active
S2M-13-F	Diodes Incorporated	1000 V	1.5 A	1.15 V @ 1.5 A	—	DO-214AA (SMB)	Active
RS2MA-13-F	Diodes Incorporated	1000 V	1.5 A	1.3 V @ 1.5 A	500 ns	DO-214AC (SMA)	Active
S2MA-13-F	Diodes Incorporated	1000 V	1.5 A	1.15 V @ 1.5 A	—	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Full Current Equivalents (3 A Rating):

The CGRB307-G (Comchip Technology) and S3MB-TP (Micro Commercial Co) are direct functional equivalents with active product status. Both maintain 1000 V reverse voltage rating and 3 A current capacity. CGRB307-G offers lower forward voltage (1.1 V vs. 1.15 V), resulting in reduced power dissipation. S3MB-TP maintains identical forward voltage characteristics to the S3MBHR5G. Both are ROHS3 compliant with unlimited moisture sensitivity level.

The NRVS3MB (onsemi) is a parametric equivalent with automotive-grade qualification (AEC-Q101) and identical electrical specifications. However, its product status is "Not For New Designs," limiting its suitability for new production applications despite current inventory availability.

Reduced Current Substitutes (2 A Rating):

The CGRB207-G (Comchip Technology) and S2M-LTP (Micro Commercial Co) are rated for 2 A average rectified current. These parts are suitable for applications where circuit current demand does not exceed 2 A. Both maintain 1000 V reverse voltage rating and DO-214AA (SMB) package compatibility. CGRB207-G has lower forward voltage (1.1 V @ 2 A), while S2M-LTP matches the original forward voltage specification (1.15 V @ 2 A).

Reduced Current Substitutes (1.5 A Rating):

The RS2M-13-F, S2M-13-F, RS2MA-13-F, and S2MA-13-F are rated for 1.5 A average rectified current. These parts are applicable only to circuits with maximum current requirements of 1.5 A. RS2M-13-F and RS2MA-13-F feature fast recovery characteristics (500 ns), while S2M-13-F and S2MA-13-F maintain standard recovery. RS2MA-13-F and S2MA-13-F use the DO-214AC (SMA) package, which differs mechanically from the original DO-214AA (SMB) package and requires PCB layout modification.

Product Status Considerations:

For new production designs, select from parts with "Active" product status: CGRB307-G, S3MB-TP, CGRB207-G, S2M-LTP, RS2M-13-F, S2M-13-F, RS2MA-13-F, and S2MA-13-F. These parts ensure long-term availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A rated diode in place of the 3 A S3MBHR5G?

A: A 2 A rated substitute is acceptable only if the circuit's maximum operating current does not exceed 2 A. If the application requires 3 A capability, a 2 A part will exceed its current rating and reduce component reliability. Verify circuit current requirements before selecting a reduced-current substitute.

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 physical dimensions and PCB footprints. Parts using SMA packages (RS2MA-13-F, S2MA-13-F) require different PCB layout and cannot be directly substituted into SMB footprints without board redesign.

Q: Does forward voltage difference affect circuit performance?

A: Forward voltage drop contributes to power dissipation in the diode. Parts with lower forward voltage (1.1 V vs. 1.15 V) generate less heat. In high-current or high-frequency applications, this difference may be significant. In low-current applications, the difference is typically negligible.

Q: Why is the NRVS3MB marked "Not For New Designs"?

A: "Not For New Designs" indicates the manufacturer is transitioning away from this part number. While functionally equivalent, it should not be selected for new production designs due to uncertain long-term availability. Active alternatives such as CGRB307-G or S3MB-TP are preferred.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing processes and environmental regulations.

Q: What does "Standard Recovery >500ns" mean compared to "Fast Recovery ≤500ns"?

A: Recovery speed refers to reverse recovery time (trr), the time required for the diode to stop conducting after the applied voltage reverses. Standard recovery diodes (>500 ns) are suitable for general-purpose rectification. Fast recovery diodes (≤500 ns) are optimized for higher-frequency applications. Both types function in general-purpose rectification circuits.

Q: Can I substitute a 1.5 A diode in a 3 A application?

A: No. A 1.5 A rated diode cannot safely operate at 3 A. Exceeding the current rating causes excessive heat generation, reduced component life, and potential failure. Current rating must equal or exceed the circuit's maximum operating current.

Q: Is the S3MB R5G identical to the S3MBHR5G?

A: The S3MB R5G is a parametric equivalent with identical electrical specifications, voltage rating, current rating, forward voltage, and recovery time. Both are discontinued at DiGi Electronics. The S3MB R5G is listed as a parametric equivalent rather than a direct replacement due to minor designation differences.

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