SMB15F48AY Equivalent & Substitute Parts

Part Overview

The SMB15F48AY is a unidirectional transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for surface mount applications in automotive-grade circuits. This component provides transient overvoltage protection with a 48V reverse standoff voltage and 100V maximum clamping voltage at peak pulse current. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMB15F48AY

STMicroelectronicsIn Stock: 5903SMB15F48AY Datasheet

Current PartRFQ

SM15T56AY

STMicroelectronicsIn Stock: 2849SM15T56AY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMB15F48AY is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff: 48V nominal
• Voltage - Breakdown (Min): 53.2V to 53.3V range
• Voltage - Clamping (Max) @ Ipp: 100V
• Current - Peak Pulse (8/20µs): 100A
• Power - Peak Pulse: 1500W
• Unidirectional topology (single channel)
• Zener diode type

Mechanical Equivalence Criteria:

• Surface mount package configuration
• Automotive grade classification
• AEC-Q101 qualification
• MSL 1 rating

The SM15T56AY meets all electrical parameters within specified tolerances and maintains automotive-grade qualification with AEC-Q101 certification. The primary distinction is packaging format: SMB15F48AY uses SMBflat leads (DO-221AA), while SM15T56AY uses SMC package (DO-214AB). Both packages are surface mount configurations suitable for automated assembly.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SM15T56AY

The SM15T56AY is the direct electrical equivalent for the obsolete SMB15F48AY. Both components are manufactured by STMicroelectronics and share identical electrical performance specifications across all critical parameters: 48V reverse standoff voltage, 100V clamping voltage, 100A peak pulse current, and 1500W peak pulse power dissipation.

Compliance and Certification: Both parts maintain automotive-grade classification and AEC-Q101 qualification, ensuring suitability for automotive applications requiring transient overvoltage protection.

Package Consideration: The SM15T56AY uses DO-214AB (SMC) package format instead of the DO-221AA (SMBflat) format of the original part. This package change requires PCB layout modification but does not affect electrical performance. Both packages are standard surface mount configurations compatible with automated assembly processes.

Operating Temperature Range: The SM15T56AY specifies a reduced operating temperature range (-40°C to 150°C junction temperature) compared to the SMB15F48AY (-55°C to 175°C). Applications requiring operation below -40°C or above 150°C junction temperature must evaluate this limitation against specific circuit requirements.

Product Status: The SM15T56AY maintains active product status with current manufacturing availability, providing supply chain continuity for designs transitioning from the obsolete SMB15F48AY.

Frequently Asked Questions (FAQ)

Q: Can SM15T56AY be used as a direct replacement for SMB15F48AY in existing designs?

A: SM15T56AY provides electrical equivalence for all critical TVS diode parameters. However, the package format differs (SMC versus SMBflat), requiring PCB footprint modification. Electrical performance and protection characteristics remain identical.

Q: What is the significance of the package difference between SMBflat and SMC?

A: SMBflat (DO-221AA) and SMC (DO-214AB) are both surface mount packages with different physical dimensions and lead configurations. The SMC package is slightly larger. PCB layout and component placement must be adjusted accordingly, but both packages are standard in automotive electronics manufacturing.

Q: Are there temperature range limitations when substituting SM15T56AY for SMB15F48AY?

A: Yes. The SM15T56AY operates from -40°C to 150°C junction temperature, while the original SMB15F48AY operates from -55°C to 175°C. Applications requiring operation outside the -40°C to 150°C range must retain the original part or identify alternative solutions.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both SMB15F48AY and SM15T56AY are automotive-grade components with AEC-Q101 qualification, suitable for automotive transient voltage suppression applications.

Q: What is the impact of the SM15T56AY being an active product versus the SMB15F48AY being obsolete?

A: The active status of SM15T56AY ensures continued manufacturing availability and supply chain support. The obsolete status of SMB15F48AY indicates discontinued production, making SM15T56AY the recommended path for new designs and production continuity.

Q: Are the electrical protection characteristics identical between these parts?

A: Yes. Both components provide identical transient voltage suppression performance: 48V reverse standoff voltage, 100V maximum clamping voltage, 100A peak pulse current handling, and 1500W peak pulse power dissipation.

Q: What moisture sensitivity considerations apply to these parts?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations for storage, handling, or assembly processes.