Equivalent & Substitute Parts for S3B General Purpose Rectifier Diode

Part Overview

The S3B is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. The device is classified as obsolete and is no longer recommended for new designs. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing production support and new design implementations. Alternative parts maintain the core electrical specifications while offering improved availability, compliance certifications, and active product support.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Current - Reverse Leakage @ Vr	10	µA @ 100 V
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the S3B is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 3 A
Mounting Type: Surface Mount
Operating Temperature Range: Compatible with -55°C to 150°C minimum

Secondary Compatibility Factors:

Package / Case: DO-214AB (SMC) or DO-214AA (SMB) for form-factor compatible alternatives
Voltage - Forward (Vf): Maximum 1.3 V @ rated current
Current - Reverse Leakage: 10 µA @ 100 V or lower
Technology: Standard or Fast Recovery acceptable

Substitute parts are grouped into three categories: direct equivalents (identical packaging and specifications), packaging variants (same electrical ratings, different package form), and active alternatives (enhanced specifications with improved compliance and availability).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	Package	Speed	Product Status	RoHS Status
S3B	Micro Commercial Co	100 V	3 A	1.2 V @ 3 A	DO-214AB, SMC	Standard Recovery >500ns	Obsolete	Non-compliant
S3B-TP	Micro Commercial Co	100 V	3 A	1.2 V @ 3 A	DO-214AB, SMC	Standard Recovery >500ns	Not For New Designs	ROHS3 Compliant
S3B-E3/57T	Vishay General Semiconductor	100 V	3 A	1.15 V @ 2.5 A	DO-214AB, SMC	Standard Recovery >500ns	Active	ROHS3 Compliant
S3B-E3/9AT	Vishay General Semiconductor	100 V	3 A	1.15 V @ 2.5 A	DO-214AB, SMC	Standard Recovery >500ns	Active	ROHS3 Compliant
RS3B-E3/57T	Vishay General Semiconductor	100 V	3 A	1.3 V @ 2.5 A	DO-214AB, SMC	Fast Recovery ≤500ns	Active	ROHS3 Compliant
RS3B-E3/9AT	Vishay General Semiconductor	100 V	3 A	1.3 V @ 2.5 A	DO-214AB, SMC	Fast Recovery ≤500ns	Active	ROHS3 Compliant
RS3B-M3/57T	Vishay General Semiconductor	100 V	3 A	1.3 V @ 2.5 A	DO-214AB, SMC	Fast Recovery ≤500ns	Active	ROHS3 Compliant
RS3B-M3/9AT	Vishay General Semiconductor	100 V	3 A	1.3 V @ 2.5 A	DO-214AB, SMC	Fast Recovery ≤500ns	Active	ROHS3 Compliant
S3BB-13-F	Diodes Incorporated	100 V	3 A	1.15 V @ 3 A	DO-214AA, SMB	Standard Recovery >500ns	Active	ROHS3 Compliant
ES3BB-13-F	Diodes Incorporated	100 V	3 A	900 mV @ 3 A	DO-214AA, SMB	Fast Recovery ≤500ns	Active	ROHS3 Compliant
CMR3U-01 BK PBFREE	Central Semiconductor Corp	100 V	3 A	1 V @ 3 A	DO-214AB, SMC	Fast Recovery ≤500ns	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Same Package, Active Status):

S3B-E3/57T and S3B-E3/9AT from Vishay General Semiconductor are direct electrical and mechanical equivalents to the S3B. Both parts maintain the DO-214AB (SMC) package, 100 V / 3 A ratings, and standard recovery speed characteristics. These parts are classified as active products with ROHS3 compliance, providing long-term availability and regulatory support. The difference between these two part numbers is packaging format: S3B-E3/57T is supplied in cut tape, while S3B-E3/9AT is supplied in tape and reel format.

Packaging Variant (Enhanced Specifications):

S3BB-13-F from Diodes Incorporated is an active alternative with identical electrical ratings but in the DO-214AA (SMB) package form factor. This part offers improved forward voltage characteristics (1.15 V @ 3 A) and extended operating temperature range (-65°C to 150°C). The SMB package is physically larger than SMC, requiring PCB layout modification. This part is suitable for applications where package size is not a constraint and enhanced thermal performance is beneficial.

Fast Recovery Alternatives (DO-214AB Package):

RS3B-E3/57T, RS3B-E3/9AT, RS3B-M3/57T, and RS3B-M3/9AT from Vishay General Semiconductor provide fast recovery characteristics (≤500ns) while maintaining the DO-214AB (SMC) package and 100 V / 3 A ratings. These parts are classified as active with ROHS3 compliance. Fast recovery technology reduces reverse recovery time, which is beneficial in high-frequency switching applications. Forward voltage is specified at 1.3 V @ 2.5 A, which is within acceptable limits for the 3 A rating.

Alternative Manufacturer (Enhanced Performance):

CMR3U-01 BK PBFREE from Central Semiconductor Corp maintains the DO-214AB (SMC) package and 100 V / 3 A ratings with fast recovery characteristics and superior forward voltage performance (1 V @ 3 A). This part is active with ROHS3 compliance and offers the lowest reverse leakage current (5 µA @ 100 V) among all alternatives. Extended operating temperature range (-65°C to 175°C) provides additional thermal margin.

Compliance and Availability:

All recommended substitute parts carry ROHS3 compliance certification, addressing regulatory requirements that the original S3B does not meet. The original S3B is classified as obsolete; S3B-TP is not recommended for new designs. All other alternatives are classified as active products, ensuring continued manufacturing support and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace S3B with S3B-E3/57T or S3B-E3/9AT?

A: Yes. Both S3B-E3/57T and S3B-E3/9AT are direct electrical and mechanical equivalents. They maintain identical voltage ratings (100 V), current ratings (3 A), package form (DO-214AB, SMC), and recovery speed characteristics (standard recovery >500ns). The only difference is packaging format: cut tape versus tape and reel. No PCB modifications are required.

Q: What is the difference between S3B-E3/57T and S3B-E3/9AT?

A: Both parts are electrically identical. S3B-E3/57T is supplied in cut tape packaging, while S3B-E3/9AT is supplied in tape and reel format. Selection depends on assembly process requirements and volume needs. Cut tape is typically used for lower-volume or manual assembly operations, while tape and reel is standard for automated pick-and-place assembly.

Q: Why would I choose a fast recovery alternative like RS3B-E3/57T instead of S3B-E3/57T?

A: Fast recovery diodes (≤500ns) are beneficial in high-frequency switching applications, power factor correction circuits, and switch-mode power supplies where reduced reverse recovery time minimizes switching losses and electromagnetic interference. Standard recovery diodes (>500ns) are suitable for lower-frequency applications and general rectification. Both maintain the same voltage and current ratings; the choice depends on application frequency and efficiency requirements.

Q: Can I use S3BB-13-F as a replacement for S3B?

A: S3BB-13-F is electrically compatible but uses a different package form (DO-214AA, SMB instead of DO-214AB, SMC). The SMB package is physically larger. This substitution requires PCB layout modification to accommodate the larger package footprint. Electrical performance is equivalent or superior, with improved forward voltage characteristics and extended temperature range. Use this alternative only if PCB layout can be modified.

Q: What is the advantage of CMR3U-01 BK PBFREE over other alternatives?

A: CMR3U-01 BK PBFREE offers the lowest forward voltage drop (1 V @ 3 A) and lowest reverse leakage current (5 µA @ 100 V) among all alternatives. It also provides the widest operating temperature range (-65°C to 175°C). These characteristics result in lower power dissipation and improved thermal performance. The fast recovery characteristic (50 ns) is beneficial for high-frequency applications. This part is ideal for efficiency-critical designs.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original S3B is RoHS non-compliant. If your application or supply chain requires RoHS compliance, any of the recommended alternatives satisfy this requirement.

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 when the applied voltage reverses. Standard recovery diodes have recovery times >500ns, while fast recovery diodes have recovery times ≤500ns. Fast recovery reduces switching losses in high-frequency applications but may have slightly higher forward voltage. Standard recovery is adequate for line-frequency rectification and general-purpose applications.

Q: Can I mix different substitute parts in the same circuit?

A: All recommended substitutes maintain identical voltage and current ratings (100 V, 3 A) and are therefore electrically interchangeable in terms of blocking and conducting characteristics. However, mixing different recovery speeds or forward voltage characteristics in the same circuit may result in unequal current distribution or voltage sharing. For optimal circuit performance, use the same part number throughout a given circuit or application.

Q: What packaging formats are available for S3B equivalents?

A: S3B equivalents are available in three packaging formats: cut tape (CT), tape and reel (TR), and bulk. Cut tape is suitable for manual assembly or low-volume production. Tape and reel is the standard format for automated assembly lines. Bulk packaging is used for specific applications or custom requirements. Select packaging format based on assembly process and volume requirements.

Q: Is the S3B-TP a suitable replacement for the original S3B?

A: S3B-TP is electrically and mechanically identical to the original S3B and offers improved ROHS3 compliance. However, it is classified as "Not For New Designs," indicating that Micro Commercial Co does not recommend this part for new product development. For new designs, select from the active alternatives such as S3B-E3/57T, S3B-E3/9AT, or parts from other manufacturers.

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