S2B General Purpose Rectifier Diode - Equivalent & Substitute Parts

Part Overview

The S2B is a general purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100V DC reverse voltage and 2A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the allowed parameter specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 100 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S2B general purpose rectifier diode is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) rating must equal or exceed 100V
Package / Case must be DO-214AA (SMB) for mechanical and thermal compatibility
Operating Temperature - Junction range must encompass -55°C to 150°C
RoHS3 compliance and MSL Level 1 classification must be maintained

Current Rating Consideration: The S2B is rated for 2A average rectified current. Substitute parts with lower current ratings (such as 1.5A) operate within the same voltage and package specifications but with reduced current capacity. Such substitutes are applicable only in circuits where the actual operating current does not exceed the substitute part's rated current.

Recovery Characteristics: The S2B exhibits standard recovery characteristics (>500ns). Substitute parts with faster recovery times (≤500ns) are electrically compatible and provide equivalent or improved performance in the same application context.

Parameter Comparison

Parameter	S2B (Taiwan Semiconductor)	RS2B-E3/52T (Vishay)	Unit
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	—
Voltage - DC Reverse (Vr) (Max)	100	100	V
Current - Average Rectified (Io)	2	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	1.3 V @ 1.5 A	V
Speed Classification	Standard Recovery >500ns	Fast Recovery ≤500ns	—
Reverse Recovery Time (trr)	1.5	150	ns
Current - Reverse Leakage @ Vr	1	5	µA @ 100 V
Capacitance @ Vr, F	30	20	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	-55 to 150	°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

Primary Selection (S2B): The S2B is the specified component and remains the primary selection for applications requiring 2A average rectified current at 100V reverse voltage in a DO-214AA surface mount package. Active product status and full RoHS3 compliance support continued use in new designs.

Substitute Selection (RS2B-E3/52T): The RS2B-E3/52T from Vishay General Semiconductor is electrically and mechanically compatible with the S2B within the following constraints:

Applications where the circuit operating current does not exceed 1.5A average rectified current
Circuits that benefit from or tolerate faster reverse recovery time (150ns versus 1.5µs)
Designs where lower reverse leakage current (5µA versus 1µA) is acceptable or advantageous
Surface mount assembly processes compatible with DO-214AA (SMB) package geometry

Both parts maintain identical voltage ratings (100V), operating temperature range (-55°C to 150°C), RoHS3 compliance, and MSL Level 1 classification. Mechanical footprint compatibility is confirmed through identical DO-214AA package specification.

Frequently Asked Questions (FAQ)

Q: Can the RS2B-E3/52T replace the S2B in all applications?

A: The RS2B-E3/52T is mechanically and electrically compatible with the S2B provided the circuit operating current does not exceed 1.5A. The S2B is rated for 2A, while the RS2B-E3/52T is rated for 1.5A. Current requirement analysis is required before substitution.

Q: What is the significance of the different recovery times (1.5µs versus 150ns)?

A: The S2B exhibits standard recovery characteristics (1.5µs), while the RS2B-E3/52T exhibits fast recovery characteristics (150ns). Fast recovery diodes switch more rapidly and generate less reverse recovery charge. Selection depends on circuit switching frequency and EMI requirements.

Q: Are both parts suitable for high-temperature applications?

A: Both the S2B and RS2B-E3/52T support the same operating temperature range of -55°C to 150°C junction temperature. Thermal management design must account for the specific current rating of the selected part.

Q: Do package dimensions differ between these parts?

A: Both parts use the DO-214AA (SMB) package specification. Mechanical footprint and thermal characteristics are equivalent. PCB layout and assembly processes are interchangeable.

Q: What compliance certifications apply to both parts?

A: Both the S2B and RS2B-E3/52T are RoHS3 compliant, REACH unaffected, and classified as MSL Level 1 (Unlimited moisture sensitivity). ECCN classification is EAR99 for both parts.

Q: How do reverse leakage currents compare?

A: The S2B exhibits 1µA reverse leakage at 100V, while the RS2B-E3/52T exhibits 5µA at 100V. Applications sensitive to leakage current should account for this difference in circuit design.

Q: Is forward voltage drop a consideration for substitution?

A: Forward voltage specifications differ at their respective rated currents: S2B is 1.15V @ 2A, while RS2B-E3/52T is 1.3V @ 1.5A. Power dissipation calculations must use the appropriate specification for the selected part and actual operating current.

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