RS2B-13 Equivalent & Substitute Parts

Part Overview

The RS2B-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 100 V DC reverse voltage and 1.5 A average rectified current in a Surface Mount SMB (DO-214AA) package. This device is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1.5 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Operating Temperature - Junction	-65 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the RS2B-13 is determined by the following critical parameters:

Voltage Rating: Substitute parts must support a minimum DC reverse voltage of 100 V
Current Rating: Substitute parts must support a minimum average rectified current of 1.5 A
Package Type: Substitute parts must use DO-214AA (SMB) surface mount package for mechanical and thermal compatibility
Operating Temperature Range: Substitute parts must support the required junction temperature range
Forward Voltage: Substitute parts with lower forward voltage reduce power dissipation; higher forward voltage is not acceptable
Reverse Recovery Time: Substitute parts with faster recovery time (≤150 ns) are direct equivalents; slower recovery time indicates different switching characteristics

Two categories of substitutes are identified:

Parametric Equivalent (Same Manufacturer): RS2B-13-F maintains identical electrical specifications and differs only in packaging format (Tape & Reel) and product status (Active vs. Discontinued)
Cross-Manufacturer Substitutes (Vishay): S2B-E3/52T and S2B-E3/5BT meet voltage and current requirements but exhibit different recovery characteristics (Standard Recovery >500 ns vs. Fast Recovery ≤500 ns) and lower forward voltage

Parameter Comparison

Parameter	RS2B-13	RS2B-13-F	S2B-E3/52T	S2B-E3/5BT
Manufacturer	Diodes Incorporated	Diodes Incorporated	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.15 V @ 1.5 A	1.15 V @ 1.5 A
Speed	Fast Recovery ≤500ns, >200mA	Fast Recovery ≤500ns, >200mA	Standard Recovery >500ns, >200mA	Standard Recovery >500ns, >200mA
Reverse Recovery Time (trr)	150 ns	150 ns	2 µs	2 µs
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	1 µA @ 100 V	1 µA @ 100 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: RS2B-13-F

The RS2B-13-F is the direct parametric equivalent from the same manufacturer. It maintains identical electrical specifications including voltage rating, current rating, forward voltage, reverse recovery time, and operating temperature range. The RS2B-13-F differs only in packaging format (Tape & Reel vs. bulk) and product status (Active vs. Discontinued). This part is ROHS3 compliant, addressing regulatory compliance gaps in the original RS2B-13. Selection of RS2B-13-F eliminates all electrical compatibility concerns and is the preferred choice for direct replacement.

Secondary Substitutes: S2B-E3/52T and S2B-E3/5BT

Both Vishay parts (S2B-E3/52T and S2B-E3/5BT) meet the core voltage and current requirements and are housed in the same DO-214AA (SMB) package. These parts are electrically compatible for applications where the following differences are acceptable:

Lower forward voltage (1.15 V vs. 1.3 V) reduces power dissipation
Slower reverse recovery time (2 µs vs. 150 ns) indicates standard recovery characteristics rather than fast recovery
Lower reverse leakage current (1 µA vs. 5 µA) improves leakage performance
Reduced junction capacitance (16 pF vs. 30 pF) may affect high-frequency behavior
Narrower operating temperature range (-55 to 150 °C vs. -65 to 150 °C) excludes low-temperature operation below -55 °C

Both Vishay parts are ROHS3 compliant and active products with substantial inventory availability. Selection of S2B-E3/52T or S2B-E3/5BT is appropriate for applications where recovery speed differences do not impact circuit performance and where the narrower temperature range is acceptable.

Frequently Asked Questions (FAQ)

Q: Can RS2B-13-F be used as a direct replacement for RS2B-13?

A: Yes. The RS2B-13-F is a parametric equivalent with identical voltage, current, forward voltage, and recovery time specifications. The only differences are packaging format (Tape & Reel) and product status (Active). Electrical performance is equivalent.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes (RS2B-13, RS2B-13-F) have reverse recovery times ≤500 ns, enabling faster switching and reduced switching losses in high-frequency applications. Standard recovery diodes (S2B-E3/52T, S2B-E3/5BT) have reverse recovery times >500 ns and are suitable for lower-frequency rectification applications. The choice depends on circuit switching frequency requirements.

Q: Are the Vishay S2B-E3/52T and S2B-E3/5BT interchangeable with each other?

A: Yes. Both Vishay parts have identical electrical specifications and package type. They differ only in packaging format (Tape & Reel designation) and inventory levels. Selection between them is based on procurement and assembly requirements.

Q: What is the impact of lower forward voltage in the Vishay substitutes?

A: Lower forward voltage (1.15 V vs. 1.3 V) reduces power dissipation in the diode during conduction. This results in lower heat generation and improved efficiency. For most applications, this is a beneficial characteristic. Thermal design calculations should account for the reduced power dissipation.

Q: Can I use S2B-E3/52T or S2B-E3/5BT in applications requiring fast recovery characteristics?

A: No. These Vishay parts have standard recovery characteristics (2 µs reverse recovery time) compared to the fast recovery specification (150 ns) of the RS2B-13. In high-frequency switching applications, the slower recovery time may cause increased switching losses, higher peak reverse current, and potential circuit instability. Use only in applications where standard recovery performance is acceptable.

Q: Are there temperature range limitations with the Vishay substitutes?

A: Yes. The Vishay S2B-E3/52T and S2B-E3/5BT have an operating junction temperature range of -55 to 150 °C, compared to -65 to 150 °C for the RS2B-13 and RS2B-13-F. Applications requiring operation below -55 °C must use the Diodes Incorporated parts. Verify application temperature requirements before selection.

Q: What is the RoHS compliance status of each part?

A: RS2B-13 is RoHS non-compliant. RS2B-13-F, S2B-E3/52T, and S2B-E3/5BT are all ROHS3 compliant. For applications subject to RoHS regulations, use RS2B-13-F or the Vishay substitutes.

Q: How do the reverse leakage current specifications compare?

A: RS2B-13 and RS2B-13-F have reverse leakage current of 5 µA @ 100 V. S2B-E3/52T and S2B-E3/5BT have lower reverse leakage current of 1 µA @ 100 V. Lower leakage current improves performance in high-impedance circuits and reduces standby power consumption.

Q: What packaging formats are available for each substitute?

A: RS2B-13 is available in bulk packaging (product status: discontinued). RS2B-13-F, S2B-E3/52T, and S2B-E3/5BT are all available in Tape & Reel (TR) format for automated assembly. All parts use the same DO-214AA (SMB) surface mount package.

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