S3BB Equivalent & Substitute Parts

Part Overview

The onsemi S3BB is a general-purpose rectifier diode rated for 100 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AA (SMB) package. This component operates across a junction temperature range of -55°C to 150°C and meets AEC-Q101 automotive qualification standards. The S3BB is designated as Last Time Buy, indicating discontinued production status. Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 100 V / 3 A rectification capability in SMB packaging.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	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 @ 100 V
Capacitance @ Vr, F	18	pF @ 0V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3BB is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AA (SMB) surface mount
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass or exceed -55°C to 150°C
Reverse Recovery Time (trr): Standard recovery characteristics (>500 ns) or faster
Forward Voltage (Vf): Operational compatibility at 3 A load
Reverse Leakage Current: Acceptable at rated voltage

Substitute parts are grouped into two categories:

Category A - Direct 3 A Equivalents: Parts rated for 100 V / 3 A with identical SMB packaging and automotive-grade compliance. These provide full functional replacement without derating.

Category B - Reduced Current Ratings (1 A, 2 A): Parts rated below 3 A are listed for reference only. These cannot serve as direct substitutes for 3 A applications but may be applicable in designs with lower current requirements or as design alternatives where current demand permits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS
S3BB	onsemi	100	3	1.15 @ 3 A	1500	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Last Time Buy	ROHS3
CMR1U-01 BK PBFREE	Central Semiconductor Corp	100	1	1 @ 1 A	50	5 @ 100 V	DO-214AA (SMB)	-65 to 150	Active	ROHS3
CMR1U-01 TR13 PBFREE	Central Semiconductor Corp	100	1	1 @ 1 A	50	5 @ 100 V	DO-214AA (SMB)	-65 to 175	Active	ROHS3
CMR2U-01 TR13 PBFREE	Central Semiconductor Corp	100	2	1 @ 2 A	50	10 @ 100 V	DO-214AA (SMB)	-65 to 150	Active	ROHS3
CMR3U-01M TR13 PBFREE	Central Semiconductor Corp	100	3	1 @ 3 A	50	5 @ 100 V	DO-214AA (SMB)	-65 to 175	Active	ROHS3
ES2B-13-F	Diodes Incorporated	100	2	0.92 @ 2 A	25	5 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
ES2B-E3/52T	Vishay General Semiconductor - Diodes Division	100	2	0.9 @ 2 A	30	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
ES2B-E3/5BT	Vishay General Semiconductor - Diodes Division	100	2	0.9 @ 2 A	30	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
ES2B-M3/52T	Vishay General Semiconductor - Diodes Division	100	2	0.9 @ 2 A	30	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
ES2B-M3/5BT	Vishay General Semiconductor - Diodes Division	100	2	0.9 @ 2 A	30	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
ES2B/1	Vishay General Semiconductor - Diodes Division	100	2	0.9 @ 2 A	30	10 @ 100 V	DO-214AA (SMB)	-55 to 150	Active	RoHS non-compliant

Engineering Selection Recommendations

Direct Equivalent (3 A Rating):

The CMR3U-01M TR13 PBFREE from Central Semiconductor Corp is the only substitute part listed that maintains the full 3 A current rating of the S3BB. This part is rated for 100 V DC reverse voltage, 3 A average rectified current, and is packaged in DO-214AA (SMB) surface mount format. The CMR3U-01M TR13 PBFREE is Active in product status, ROHS3 compliant, and operates across -65°C to 175°C, which exceeds the S3BB operating range. Forward voltage is specified at 1 V @ 3 A, compared to 1.15 V @ 3 A for the S3BB. Reverse recovery time is 50 ns, faster than the S3BB at 1.5 µs. This part is suitable for direct replacement in applications requiring full 3 A capacity.

Reduced Current Alternatives (2 A Rating):

The following parts are rated for 100 V / 2 A and are Active in product status with ROHS3 compliance:

CMR2U-01 TR13 PBFREE (Central Semiconductor Corp)
ES2B-13-F (Diodes Incorporated)
ES2B-E3/52T, ES2B-E3/5BT, ES2B-M3/52T, ES2B-M3/5BT (Vishay General Semiconductor - Diodes Division)

These parts are applicable only in designs where the maximum current requirement does not exceed 2 A. All maintain 100 V reverse voltage rating and DO-214AA (SMB) packaging.

Reduced Current Alternatives (1 A Rating):

The CMR1U-01 BK PBFREE and CMR1U-01 TR13 PBFREE from Central Semiconductor Corp are rated for 100 V / 1 A. These are applicable only in designs where the maximum current requirement does not exceed 1 A.

Non-Compliant Part:

The ES2B/1 from Vishay General Semiconductor - Diodes Division is rated for 100 V / 2 A but is marked as RoHS non-compliant. This part is not recommended for new designs or applications requiring RoHS compliance.

Packaging Considerations:

All substitute parts listed are available in DO-214AA (SMB) surface mount packaging, matching the S3BB footprint. Tape & Reel (TR) packaging is available for most active parts, supporting automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CMR3U-01M TR13 PBFREE be used as a direct replacement for the S3BB?

A: Yes. The CMR3U-01M TR13 PBFREE is rated for 100 V / 3 A in DO-214AA (SMB) packaging and is Active in product status with ROHS3 compliance. It meets all electrical and mechanical requirements for direct substitution. The forward voltage is lower (1 V vs. 1.15 V @ 3 A), and reverse recovery time is faster (50 ns vs. 1.5 µs), both favorable characteristics.

Q: Why are 2 A and 1 A rated parts listed if the S3BB is rated for 3 A?

A: These parts are listed for reference in applications where design requirements permit operation at reduced current levels. They cannot serve as direct replacements for circuits designed to operate at 3 A. Selection of a lower-rated part in a 3 A application would result in component overstress and potential failure.

Q: What is the difference between Tape & Reel (TR) and Bulk packaging options?

A: Tape & Reel (TR) packaging is suitable for automated pick-and-place assembly processes and is the standard for high-volume manufacturing. Bulk packaging is used for manual assembly or lower-volume applications. Both packaging formats contain the same die and electrical characteristics; the difference is in delivery and handling format.

Q: Are all listed substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except for ES2B/1, which is marked as RoHS non-compliant. For applications requiring RoHS compliance, ES2B/1 must not be used.

Q: How do forward voltage differences affect circuit performance?

A: The S3BB specifies 1.15 V forward voltage at 3 A, while the CMR3U-01M TR13 PBFREE specifies 1 V at 3 A. This 0.15 V difference results in lower power dissipation in the substitute part. In rectifier circuits, lower forward voltage reduces heat generation and improves efficiency. This difference is generally beneficial and does not create compatibility issues.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. The S3BB has a trr of 1.5 µs (standard recovery), while the CMR3U-01M TR13 PBFREE has a trr of 50 ns (fast recovery). Faster recovery reduces switching losses and is advantageous in high-frequency applications. Standard recovery is adequate for line-frequency rectification.

Q: Can I use multiple lower-rated diodes in parallel to achieve 3 A capacity?

A: Parallel connection of diodes is not addressed in this substitution reference. Such configurations require detailed thermal and current-sharing analysis beyond the scope of direct part substitution.

Q: What is the operating temperature range significance?

A: The S3BB operates from -55°C to 150°C junction temperature. The CMR3U-01M TR13 PBFREE extends this range to -65°C to 175°C. If the application requires operation at temperatures below -55°C or above 150°C, the substitute part provides additional margin. If the application is constrained to the S3BB range, both parts are suitable.

Q: Are there any automotive qualification differences?

A: The S3BB carries AEC-Q101 automotive qualification. The substitute parts listed do not explicitly state automotive qualification in the provided data. For applications requiring automotive-grade components, verification of qualification status with the manufacturer is necessary.

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