S3MB Equivalent & Substitute Parts

Part Overview

The S3MB is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This diode is qualified to AEC-Q101 automotive standards and features standard recovery characteristics with a reverse recovery time of 1.5 µs. The part is designated as "Not For New Designs," indicating it is an established product suitable for maintenance, repair, and legacy system applications. Equivalent and substitute parts are necessary for design flexibility, supply chain continuity, and alternative sourcing options while maintaining electrical and mechanical compatibility.

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
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the S3MB is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V
Package / Case: DO-214AA (SMB) or compatible surface mount package
Mounting Type: Surface Mount
Current - Average Rectified (Io): 3 A (for parametric equivalents) or lower current ratings (for similar parts with reduced current capacity)

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current
Reverse recovery time (trr) and recovery speed classification
Reverse leakage current
Operating temperature range
RoHS and automotive qualification status

Substitute parts are grouped into two categories:

Parametric Equivalent: NRVS3MB (onsemi) — identical electrical specifications and current rating, differing only in packaging format (Tape & Reel vs. Cut Tape).
Similar Parts with Reduced Current Rating: Central Semiconductor Corp CMR series (CMR1-10, CMR1U-10, CMR2-10, CMR3U-10M) and Diodes Incorporated RS2M-13-F — maintain 1000 V reverse voltage and DO-214AA package but offer 1 A, 2 A, or 3 A current ratings with varying recovery characteristics and forward voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs/ns]	Package	Packaging Format	Product Status	AEC-Q101
S3MB	onsemi	1000	3	1.15 @ 3A	1.5 µs	DO-214AA	Cut Tape (CT)	Not For New Designs	Yes
NRVS3MB	onsemi	1000	3	1.15 @ 3A	1.5 µs	DO-214AA	Tape & Reel (TR)	Not For New Designs	Yes
CMR1-10 BK PBFREE	Central Semiconductor	1000	1	1.1 @ 1A	>500 ns	DO-214AA	Bulk	Active	No
CMR1-10 TR13 PBFREE	Central Semiconductor	1000	1	1.1 @ 1A	≤500 ns	DO-214AA	Tape & Reel (TR)	Active	No
CMR1U-10 BK PBFREE	Central Semiconductor	1000	1	1.7 @ 1A	100 ns	DO-214AA	Bulk	Active	No
CMR1U-10 TR13 PBFREE	Central Semiconductor	1000	1	1.7 @ 1A	100 ns	DO-214AA	Tape & Reel (TR)	Active	No
CMR2-10 BK PBFREE	Central Semiconductor	1000	2	1.1 @ 2A	2.5 µs	DO-214AA	Bulk	Active	No
CMR2-10 TR13 PBFREE	Central Semiconductor	1000	2	1.1 @ 2A	2.5 µs	DO-214AA	Tape & Reel (TR)	Active	No
CMR3U-10M BK PBFREE	Central Semiconductor	1000	3	2.0 @ 3A	100 ns	DO-214AA	Bulk	Active	No
CMR3U-10M TR13 PBFREE	Central Semiconductor	1000	3	2.0 @ 3A	100 ns	DO-214AB	Tape & Reel (TR)	Active	No
RS2M-13-F	Diodes Incorporated	1000	1.5	1.3 @ 1.5A	500 ns	DO-214AA	Tape & Reel (TR)	Active	No

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent):

NRVS3MB is the parametric equivalent to S3MB, offering identical electrical specifications and current rating. The only difference is packaging format: NRVS3MB is supplied in Tape & Reel format, while S3MB is supplied in Cut Tape format. Both parts carry AEC-Q101 automotive qualification and are designated "Not For New Designs." Selection between these two depends on assembly process requirements and tape handling capabilities.

For Current-Reduced Substitution:

When circuit design permits operation at reduced current levels, the following active-status alternatives are available:

CMR1-10 series (1 A rating): Suitable for applications requiring 1 A or less. CMR1-10 TR13 PBFREE offers fast recovery (≤500 ns) in Tape & Reel format. CMR1-10 BK PBFREE offers standard recovery (>500 ns) in Bulk format.
CMR1U-10 series (1 A rating, fast recovery): Provides fast recovery characteristics (100 ns trr) with higher forward voltage (1.7 V @ 1 A). Available in Bulk and Tape & Reel formats.
CMR2-10 series (2 A rating): Intermediate current rating with standard recovery characteristics (2.5 µs trr). Available in Bulk and Tape & Reel formats.
CMR3U-10M series (3 A rating, fast recovery): Matches the 3 A current rating with fast recovery (100 ns trr) and higher forward voltage (2.0 V @ 3 A). CMR3U-10M TR13 PBFREE is supplied in Tape & Reel format. Note: CMR3U-10M TR13 PBFREE uses DO-214AB (SMC) package, which differs from the S3MB DO-214AA (SMB) package.
RS2M-13-F (1.5 A rating): Diodes Incorporated alternative with 1.5 A rating, fast recovery (500 ns trr), and active product status. Supplied in Tape & Reel format.

All Central Semiconductor and Diodes Incorporated alternatives maintain 1000 V reverse voltage rating and DO-214AA surface mount package (except CMR3U-10M TR13 PBFREE, which uses DO-214AB). All listed substitutes are RoHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can NRVS3MB be used as a direct replacement for S3MB?

A: Yes. NRVS3MB is a parametric equivalent with identical electrical specifications (1000 V, 3 A, 1.15 V forward voltage, 1.5 µs recovery time) and AEC-Q101 qualification. The difference is packaging format: NRVS3MB is Tape & Reel while S3MB is Cut Tape. Compatibility depends on assembly equipment capability to handle the respective tape formats.

Q: What is the difference between CMR1-10 BK PBFREE and CMR1-10 TR13 PBFREE?

A: Both parts have identical electrical specifications (1000 V, 1 A rating, 1.1 V forward voltage). The difference is recovery speed and packaging: CMR1-10 BK PBFREE has standard recovery (>500 ns) in Bulk format, while CMR1-10 TR13 PBFREE has fast recovery (≤500 ns) in Tape & Reel format. Selection depends on circuit timing requirements and assembly process.

Q: Can I use CMR3U-10M TR13 PBFREE as a substitute for S3MB?

A: CMR3U-10M TR13 PBFREE matches the 3 A current rating and 1000 V reverse voltage. However, it uses DO-214AB (SMC) package instead of DO-214AA (SMB) package. This package difference affects PCB footprint and may require layout modification. Verify footprint compatibility before selection.

Q: Why do some substitutes have higher forward voltage than S3MB?

A: Forward voltage varies with diode technology and recovery speed classification. CMR1U-10 series and CMR3U-10M series feature fast recovery (100 ns trr), which results in higher forward voltage (1.7 V and 2.0 V respectively) compared to S3MB standard recovery (1.5 µs, 1.15 V). This trade-off between recovery speed and forward voltage is inherent to diode design. Circuit design must account for the increased voltage drop.

Q: Are all substitute parts automotive qualified?

A: S3MB and NRVS3MB carry AEC-Q101 automotive qualification. Central Semiconductor CMR series and Diodes Incorporated RS2M-13-F do not list AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, NRVS3MB is the only qualified alternative.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Bulk packaging supplies loose components, suitable for manual assembly or low-volume applications. Tape & Reel packaging supplies components on continuous tape for automated pick-and-place assembly. Selection depends on production volume and assembly equipment capability.

Q: Can I substitute a lower-current-rated diode (e.g., CMR1-10) for the 3 A S3MB?

A: Lower-current-rated diodes can be used only if circuit design ensures the actual operating current does not exceed the substitute part's rating. For example, CMR1-10 (1 A rating) can replace S3MB only in applications where maximum current is 1 A or less. Exceeding the rated current causes excessive heat generation and premature failure. Verify actual circuit current requirements before substitution.

Q: What does "Not For New Designs" mean for S3MB?

A: "Not For New Designs" indicates S3MB is an established, mature product suitable for maintenance, repair, and legacy system applications. New circuit designs should consider active-status alternatives such as NRVS3MB or Central Semiconductor CMR series. However, S3MB remains available for existing applications requiring this specific part.

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