Equivalent & Substitute Parts for S3AB

Part Overview

The S3AB is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. The S3AB is classified as obsolete, indicating that the manufacturer has discontinued active production and support for this component. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this rectifier diode.

Substiute Parts

S3AB

Diodes IncorporatedIn Stock: 2498S3AB Datasheet

Current PartRFQ

S3MB_HF

Diodes IncorporatedIn Stock: 777S3MB_HF Datasheet

MFR RecommendedRFQ

S3AB

Diodes IncorporatedIn Stock: 2498S3AB Datasheet

SimilarRFQ

S3AB-TP

Micro Commercial CoIn Stock: 1754S3AB-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S3AB rectifier diode are identified based on electrical and mechanical parameter compatibility. The substitution logic is structured as follows:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): Equal to or greater than 50 V
• Current - Average Rectified (Io): Equal to 3 A
• Voltage - Forward (Vf) (Max) @ If: Equal to 1.15 V @ 3 A
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• Technology: Standard
• Speed: Standard Recovery >500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant

Substitute Parts Identified:

1. S3MB_HF (Diodes Incorporated) — Manufacturer recommended substitute. Exceeds voltage rating (1000 V vs. 50 V), maintains 3 A current rating, identical forward voltage, same package, active product status.

2. S3AB-TP (Micro Commercial Co) — Equivalent part with identical electrical specifications (50 V, 3 A, 1.15 V forward voltage), same SMB package, tape & reel packaging option, not for new designs status.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs:

The S3MB_HF (Diodes Incorporated) is the manufacturer-recommended substitute and is classified as an active product. This part maintains electrical compatibility with the S3AB across all critical parameters: 3 A current rating, 1.15 V forward voltage, standard recovery speed, and SMB package. The S3MB_HF provides enhanced voltage rating (1000 V vs. 50 V), which offers additional design margin and reliability in applications where reverse voltage stress may occur. The extended operating temperature range (-65°C to 150°C vs. -55°C to 150°C) provides broader environmental compatibility. ROHS3 compliance and REACH unaffected status ensure regulatory alignment.

For Existing Inventory and Legacy Support:

The S3AB-TP (Micro Commercial Co) provides electrical equivalence with identical voltage and current ratings. This part is classified as "Not For New Designs," indicating it is suitable for sustaining production of existing designs or inventory management purposes. The S3AB-TP is available in tape & reel packaging, which may be advantageous for automated assembly processes. ROHS3 compliance is maintained.

Compliance and Regulatory Status:

All identified substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the S3MB_HF be used as a direct replacement for the S3AB in all applications?

A: The S3MB_HF is electrically compatible with the S3AB across all critical parameters: 3 A current rating, 1.15 V forward voltage, standard recovery speed, and identical SMB package. The higher voltage rating (1000 V vs. 50 V) does not prevent substitution; it provides additional design margin. Both parts are ROHS3 compliant and have identical package dimensions.

Q: What is the difference between the S3AB and S3AB-TP?

A: The S3AB and S3AB-TP are electrically equivalent, both rated for 50 V and 3 A with 1.15 V forward voltage. The primary difference is the manufacturer (Diodes Incorporated vs. Micro Commercial Co) and packaging format (S3AB-TP is supplied in tape & reel). The S3AB-TP is classified as "Not For New Designs," making it suitable for legacy support rather than new product development.

Q: Are all substitute parts available in the same SMB package?

A: Yes. The S3AB, S3MB_HF, and S3AB-TP are all supplied in the DO-214AA (SMB) surface mount package. This ensures mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Q: What is the significance of the S3AB being classified as obsolete?

A: Obsolete status indicates that Diodes Incorporated has discontinued active production and support for the S3AB. The S3MB_HF is the manufacturer-recommended active alternative, ensuring continued availability and technical support for new production requirements.

Q: Do all substitute parts meet the same regulatory requirements as the S3AB?

A: Yes. The S3MB_HF and S3AB-TP are both ROHS3 compliant and REACH unaffected, matching the regulatory status of the S3AB. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: What is the operating temperature range difference between the S3AB and S3MB_HF?

A: The S3AB operates from -55°C to 150°C, while the S3MB_HF operates from -65°C to 150°C. The S3MB_HF provides a 10°C lower minimum operating temperature, offering broader environmental compatibility for applications requiring extended low-temperature performance.