S2B Equivalent & Substitute Parts

Part Overview

The onsemi S2B is a standard recovery rectifier diode in DO-214AA (SMB) surface mount package rated for 100 V DC reverse voltage and 2 A average rectified current. This component is classified as "Not For New Designs," indicating it is a legacy product. Finding equivalent and substitute parts is necessary for applications requiring continued supply, design flexibility, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
Speed	Standard Recovery >500ns, > 200mA (Io)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) must be equal to or greater than 100 V
Current - Average Rectified (Io) must be equal to or greater than 2 A
Forward voltage (Vf) must be within acceptable operating range for the application
Recovery speed classification must be compatible with circuit timing requirements

Mechanical Compatibility Requirements:

Package / Case must be DO-214AA (SMB) or equivalent surface mount package
Mounting Type must be Surface Mount
Operating Temperature range must encompass the application's thermal requirements

Compliance Requirements:

RoHS3 Compliance status must be maintained
Moisture Sensitivity Level (MSL) must be 1 (Unlimited) or equivalent

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents (100 V, 2 A, DO-214AA SMB): Parts that match all critical electrical parameters and use the same DO-214AA (SMB) package.

Category B - Electrical Equivalents with Package Variations (100 V, 2 A, Alternative Packages): Parts that match electrical parameters but use alternative surface mount packages (SMA/DO-214AC).

Category C - Current-Reduced Variants (100 V, 1.5 A, DO-214AA SMB): Parts with reduced current rating but matching voltage and package specifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Speed	Temp Range	Product Status
S2B	onsemi	100 V	2 A	1.15 V @ 2 A	DO-214AA (SMB)	Standard >500ns	-65°C ~ 150°C	Not For New Designs
ES2B	YAGEO	100 V	2 A	0.95 V	DO-214AA (SMB)	Standard >500ns	Not specified	Active
CGRB202-G	Comchip Technology	100 V	2 A	1.1 V @ 2 A	DO-214AA (SMB)	Fast ≤500ns	-55°C ~ 150°C	Active
CURB202-G	Comchip Technology	100 V	2 A	1.0 V @ 2 A	DO-214AA (SMB)	Fast ≤500ns	-55°C ~ 150°C	Active
ES2B-13-F	Diodes Incorporated	100 V	2 A	0.92 V @ 2 A	DO-214AA (SMB)	Fast ≤500ns	-55°C ~ 150°C	Active
ES2B_R1_00001	Panjit International Inc.	100 V	2 A	0.95 V @ 2 A	DO-214AC (SMA)	Fast ≤500ns	-55°C ~ 150°C	Active
ESH2B-E3/5BT	Vishay General Semiconductor - Diodes Division	100 V	2 A	0.93 V @ 2 A	DO-214AA (SMB)	Fast ≤500ns	-55°C ~ 175°C	Active
S2B-13-F	Diodes Incorporated	100 V	1.5 A	1.15 V @ 1.5 A	DO-214AA (SMB)	Standard >500ns	-65°C ~ 150°C	Active
S2B-E3/52T	Vishay General Semiconductor - Diodes Division	100 V	1.5 A	1.15 V @ 1.5 A	DO-214AA (SMB)	Standard >500ns	-55°C ~ 150°C	Active
S2BA-13-F	Diodes Incorporated	100 V	1.5 A	1.15 V @ 1.5 A	DO-214AC (SMA)	Standard >500ns	-65°C ~ 150°C	Active
MRS1504T3G	onsemi	400 V	1.5 A	1.04 V @ 1.5 A	DO-214AA (SMB)	Standard >500ns	-55°C ~ 150°C	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement (100 V, 2 A, DO-214AA SMB Package):

Select from the following parts based on product status and compliance requirements:

ES2B (YAGEO): Active product status with ROHS3 compliance and MSL 1. Suitable for new applications requiring continued supply of 100 V, 2 A rectifier in SMB package.
CGRB202-G (Comchip Technology): Active product with ROHS3 compliance. Features fast recovery speed (≤500ns) and forward voltage of 1.1 V @ 2 A. Operating temperature range -55°C ~ 150°C.
CURB202-G (Comchip Technology): Active product with ROHS3 compliance. Lowest forward voltage (1.0 V @ 2 A) among 100 V, 2 A options. Fast recovery speed with 50 ns reverse recovery time. Limited inventory (730 Pcs).
ES2B-13-F (Diodes Incorporated): Active product with ROHS3 compliance. Fast recovery speed (≤500ns) with 25 ns reverse recovery time. Forward voltage 0.92 V @ 2 A. Operating temperature -55°C ~ 150°C.
ESH2B-E3/5BT (Vishay General Semiconductor - Diodes Division): Active product with ROHS3 compliance. Extended operating temperature range (-55°C ~ 175°C). Fast recovery speed with 35 ns reverse recovery time. Forward voltage 0.93 V @ 2 A.

For Package-Variant Replacement (100 V, 2 A, SMA Package):

ES2B_R1_00001 (Panjit International Inc.): Active product in DO-214AC (SMA) package. Electrical parameters match 100 V, 2 A specification. Use only if SMA package is acceptable for PCB layout.

For Current-Reduced Applications (100 V, 1.5 A, DO-214AA SMB Package):

S2B-13-F (Diodes Incorporated): Active product with ROHS3 compliance. Matches original S2B electrical characteristics at reduced 1.5 A current rating. Standard recovery speed.
S2B-E3/52T (Vishay General Semiconductor - Diodes Division): Active product with ROHS3 compliance. Identical electrical parameters to S2B-13-F. Reverse recovery time 2 µs matches original S2B specification.
S2BA-13-F (Diodes Incorporated): Active product in DO-214AC (SMA) package. 100 V, 1.5 A rating with standard recovery speed. Use only if SMA package is acceptable.

Not Recommended for Direct Substitution:

MRS1504T3G (onsemi): Voltage rating of 400 V exceeds S2B specification. Current rating reduced to 1.5 A. Use only in applications requiring higher voltage rating.

Frequently Asked Questions (FAQ)

Q: Can ES2B replace S2B in all applications?

A: ES2B matches the critical electrical parameters (100 V, 2 A) and uses the same DO-214AA (SMB) package. However, ES2B features lower forward voltage (0.95 V vs. 1.15 V) and faster recovery speed. Verify that the application circuit tolerates these differences before substitution.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: Both are surface mount rectifier packages with different physical dimensions. DO-214AA (SMB) is larger than DO-214AC (SMA). PCB layout and thermal requirements determine package suitability. Parts with SMA package designation (ES2B_R1_00001, S2BA-13-F) require PCB redesign if the original design uses SMB footprint.

Q: Why do some substitute parts have lower forward voltage?

A: Forward voltage variation is a normal characteristic difference between manufacturers and product generations. Lower forward voltage (0.92 V to 1.0 V vs. 1.15 V) reduces power dissipation and heat generation. Verify that the application circuit design accommodates this parameter variation.

Q: Can I use CURB202-G instead of S2B?

A: CURB202-G meets the 100 V, 2 A electrical specification and uses the same DO-214AA (SMB) package. CURB202-G features fast recovery speed (≤500ns, 50 ns trr) compared to S2B standard recovery (>500ns, 2 µs trr). Fast recovery characteristics are compatible with standard recovery applications. Verify circuit timing requirements before substitution.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the part is legacy or obsolete for new product development. Manufacturers may discontinue production. For new designs, select from parts with "Active" product status such as ES2B, CGRB202-G, ES2B-13-F, or ESH2B-E3/5BT.

Q: Can I substitute a 1.5 A part (S2B-13-F) for the 2 A S2B?

A: Substitution is possible only if the application circuit current requirement does not exceed 1.5 A. The 1.5 A rating represents the maximum average rectified current. Exceeding this rating causes component failure. Verify actual circuit current draw before using current-reduced variants.

Q: Why is ESH2B-E3/5BT rated to 175°C junction temperature?

A: ESH2B-E3/5BT is specified with extended maximum junction temperature (-55°C ~ 175°C) compared to S2B (-65°C ~ 150°C). This provides additional thermal margin in high-temperature applications. The part is suitable for S2B replacement in all temperature ranges within S2B specification.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original S2B compliance status. This ensures compatibility with modern manufacturing and environmental requirements.

Q: What does "Standard Recovery >500ns" mean?

A: Recovery speed describes how quickly the diode transitions from conducting to blocking state. Standard recovery (>500ns) indicates slower transition compared to fast recovery (≤500ns). Standard recovery diodes are suitable for general-purpose rectification. Fast recovery variants reduce switching losses in high-frequency applications.

Q: Can MRS1504T3G be used as a substitute?

A: MRS1504T3G is not a direct substitute. It features 400 V reverse voltage rating (vs. 100 V) and 1.5 A current rating (vs. 2 A). Use MRS1504T3G only in applications requiring higher voltage rating. For 100 V, 2 A applications, select from the recommended Category A parts.

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