Equivalent & Substitute Parts for S2B-13

Part Overview

The S2B-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 part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Capacitance @ Vr, F	20pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the S2B-13 is determined by the following critical parameters:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 1.5 A minimum
Voltage - Forward (Vf) (Max) @ If: Must not exceed application requirements
Current - Reverse Leakage @ Vr: 5 µA @ 100 V maximum
Capacitance @ Vr, F: 20pF @ 4V, 1MHz maximum

Mechanical Parameters:

Package / Case: DO-214AA, SMB (Surface Mount)
Mounting Type: Surface Mount

Environmental Parameters:

Operating Temperature - Junction: -65°C ~ 150°C minimum range

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and manufacturer-recommended alternatives (meeting or exceeding all critical parameters within the same package class).

Parameter Comparison

Parameter	S2B-13 (Diodes Inc.)	S2B-13-F (Diodes Inc.)	RS2B-E3/52T (Vishay)	S2B (Diotec)
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	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	1.15 V @ 1.5 A	1.3 V @ 1.5 A	1.15 V @ 2 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery =< 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Capacitance @ Vr, F	20pF @ 4V, 1MHz	20pF @ 4V, 1MHz	20pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable
Product Status	Discontinued at DiGi Electronics	Active	Active	Active

Engineering Selection Recommendations

S2B-13-F (Diodes Incorporated) is the primary parametric equivalent. This part maintains identical electrical specifications and operating temperature range as the S2B-13 while offering active product status and ROHS3 compliance. The S2B-13-F is supplied in Tape & Reel packaging with 45,100 units in stock, providing superior availability for production environments.

RS2B-E3/52T (Vishay General Semiconductor - Diodes Division) is a manufacturer-recommended alternative suitable for applications where fast recovery characteristics are beneficial. This part meets all critical voltage and current parameters with identical reverse leakage and capacitance specifications. The operating temperature range is reduced to -55°C ~ 150°C, which may limit use in extreme low-temperature environments. ROHS3 compliance and active product status are confirmed.

S2B (Diotec Semiconductor) is a manufacturer-recommended alternative with elevated current rating (2 A versus 1.5 A), providing design margin for applications with variable load conditions. This part maintains the 100 V voltage rating and identical forward voltage characteristics at its rated current. The operating temperature range is -50°C ~ 150°C. Capacitance data is not specified for this variant. RoHS status is not applicable per vendor documentation.

Selection between these alternatives depends on compliance requirements, temperature operating range, and current margin specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can S2B-13-F be used as a direct replacement for S2B-13?

A: Yes. The S2B-13-F is a parametric equivalent with identical voltage rating (100 V), current rating (1.5 A), forward voltage (1.15 V @ 1.5 A), recovery speed, reverse leakage, and capacitance specifications. Both parts use the DO-214AA (SMB) package. The primary difference is product status (S2B-13-F is active) and RoHS compliance (S2B-13-F is ROHS3 compliant).

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

A: Recovery speed refers to the time required for a diode to transition from forward conduction to reverse blocking. The S2B-13 and S2B-13-F specify standard recovery (>500 ns), while the RS2B-E3/52T specifies fast recovery (≤500 ns). Fast recovery diodes exhibit lower reverse recovery time (150 ns for RS2B-E3/52T), reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for line-frequency and low-frequency rectification circuits.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the DO-214AA (SMB) Surface Mount package, which maintains identical footprint dimensions and land pattern requirements. No PCB redesign is necessary when substituting between these parts.

Q: What is the significance of the operating temperature range difference between S2B-13 and RS2B-E3/52T?

A: The S2B-13 operates from -65°C to 150°C, while the RS2B-E3/52T operates from -55°C to 150°C. The 10°C difference at the lower temperature limit may be significant for applications requiring operation in extreme cold environments. For standard industrial and consumer applications operating above -55°C, this difference is not a limiting factor.

Q: Why does the Diotec S2B have a higher current rating (2 A) than the S2B-13 (1.5 A)?

A: The Diotec S2B is a different product variant with enhanced current capacity. The 2 A rating provides additional design margin and thermal headroom compared to the 1.5 A S2B-13. This higher rating does not affect compatibility in circuits designed for 1.5 A operation, as the part will operate within its safe operating area at reduced current levels.

Q: What does ROHS3 compliance mean for the S2B-13-F?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive (RoHS 3), which restricts the use of specific hazardous materials in electrical and electronic equipment. The S2B-13-F meets these environmental and material restrictions, making it suitable for applications and markets requiring RoHS-compliant components. The original S2B-13 is RoHS non-compliant.

Q: Can the RS2B-E3/52T be used in applications where the S2B-13 was originally specified?

A: Yes, with consideration of recovery speed characteristics. The RS2B-E3/52T meets all critical electrical parameters (100 V, 1.5 A, 5 µA reverse leakage, 20 pF capacitance). The fast recovery characteristic (150 ns) is a performance enhancement suitable for switching applications. The reduced operating temperature range (-55°C minimum) must be verified against application requirements.

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