SMB15F28A Equivalent & Substitute Parts

Part Overview

The SMB15F28A is a unidirectional transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection applications. This component features a 28V reverse standoff voltage with a 59V clamping voltage and peak pulse current rating of 169A (8/20µs). The SMB15F28A is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMB15F28A

STMicroelectronicsIn Stock: 2867SMB15F28A Datasheet

Current PartRFQ

SMCJ28A-TR

STMicroelectronicsIn Stock: 3002SMCJ28A-TR Datasheet

DirectRFQ

SM15T33A

STMicroelectronicsIn Stock: 17369SM15T33A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMB15F28A are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 28V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 59V
• Current - Peak Pulse (10/1000µs): 169A (8/20µs)
• Power - Peak Pulse: 1500W
• Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Category: SMB or SMC form factors (DO-221AA, DO-214AB)

Compliance Criteria:

• Product Status: Active (preferred for new designs)
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected
• ECCN: EAR99

The substitute parts listed maintain identical or equivalent electrical performance within the specified operating parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

SMCJ28A-TR is a direct electrical equivalent with identical voltage and current ratings. This part is manufactured by STMicroelectronics with active product status, ensuring long-term availability and supply chain continuity. The primary difference is the package format (DO-214AB SMC versus DO-221AA SMB Flat), which requires PCB layout modification. The operating temperature range is reduced to -55°C ~ 150°C compared to the original part's -55°C ~ 175°C specification. This part is supplied in Tape & Reel packaging format.

SM15T33A is the manufacturer-recommended substitute, offering active product status and the highest inventory availability. This part maintains identical electrical performance with a reverse standoff voltage of 28.2V (within tolerance of the 28V specification) and equivalent clamping and current ratings. The operating temperature range is -55°C ~ 150°C. This part is supplied in Cut Tape and Digi-Reel packaging formats. Both substitute parts carry RoHS3 compliance certification.

Selection between SMCJ28A-TR and SM15T33A depends on packaging requirements and supply chain preferences. Both parts satisfy electrical equivalence and compliance requirements for direct substitution in general-purpose TVS applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28A-TR and SM15T33A be used interchangeably with SMB15F28A?

A: Both parts are electrically equivalent with identical voltage clamping (59V), peak pulse current (169A at 8/20µs), and power dissipation (1500W) ratings. The primary consideration is package format compatibility with existing PCB designs. SMCJ28A-TR and SM15T33A use DO-214AB (SMC) packaging, while SMB15F28A uses DO-221AA (SMB Flat). PCB footprint modification is required for package conversion.

Q: What is the difference between SMCJ28A-TR and SM15T33A?

A: Both parts are electrically equivalent with nearly identical specifications. SMCJ28A-TR has a reverse standoff voltage of 28V, while SM15T33A has 28.2V. Both maintain the 59V clamping voltage and 169A peak pulse current. The primary differences are packaging format (Tape & Reel versus Cut Tape/Digi-Reel) and inventory availability. SM15T33A is the manufacturer-recommended substitute with higher stock levels.

Q: Are there operating temperature limitations when substituting?

A: The SMB15F28A operates from -55°C to 175°C (TJ). Both substitute parts (SMCJ28A-TR and SM15T33A) operate from -55°C to 150°C (TJ). If the application requires operation above 150°C, the original SMB15F28A specifications cannot be met with these substitutes. Verify application temperature requirements before selection.

Q: Do the substitute parts have the same moisture sensitivity rating?

A: Yes. All three parts (SMB15F28A, SMCJ28A-TR, and SM15T33A) have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Are the substitute parts RoHS compliant?

A: SMCJ28A-TR and SM15T33A are both RoHS3 compliant. The original SMB15F28A does not specify RoHS status. Both substitutes meet current environmental compliance requirements.

Q: What packaging formats are available for the substitute parts?

A: SMCJ28A-TR is supplied in Tape & Reel (TR) format. SM15T33A is supplied in Cut Tape (CT) and Digi-Reel packaging formats. Select based on production volume and assembly equipment compatibility.