SMB15F26AY Equivalent & Substitute Parts

Part Overview

The SMB15F26AY 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 26V reverse standoff voltage and 53.5V maximum clamping voltage at peak pulse current of 187A (8/20µs). The SMB15F26AY is classified as obsolete, necessitating identification of functionally equivalent active alternatives to support ongoing design requirements and procurement needs.

Substiute Parts

SMB15F26AY

STMicroelectronicsIn Stock: 879SMB15F26AY Datasheet

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SM15T30AY

STMicroelectronicsIn Stock: 6535SM15T30AY Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SMB15F26AY is based on electrical and mechanical parameter equivalence within the TVS diode category. The primary substitution candidate, SM15T30AY, maintains functional compatibility through the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Clamping (Max) @ Ipp: 53.5V (identical)
• Current - Peak Pulse (10/1000µs): 187A (8/20µs) (identical)
• Power - Peak Pulse: 1500W (1.5kW) (identical)
• Voltage - Reverse Standoff (Typ): 25.6V (within acceptable tolerance of 26V specification)
• Voltage - Breakdown (Min): 28.5V (within acceptable tolerance of 28.9V specification)

Mechanical and Compliance Equivalence:

• Unidirectional Channels: 1 (identical)
• Type: Zener (identical)
• Grade: Automotive (identical)
• Qualification: AEC-Q101 (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)
• REACH Status: REACH Unaffected (identical)
• ECCN: EAR99 (identical)

Package Consideration: The SM15T30AY utilizes SMC (DO-214AB) packaging versus the SMBflat (DO-221AA) packaging of the SMB15F26AY. This represents a mechanical difference requiring PCB layout verification but does not affect electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The SM15T30AY is the primary substitute for the obsolete SMB15F26AY based on electrical parameter equivalence and compliance certification alignment. Both components maintain identical clamping voltage (53.5V), peak pulse current (187A at 8/20µs), and peak pulse power (1500W) specifications. Both components carry automotive-grade classification with AEC-Q101 qualification, ensuring suitability for automotive applications.

The SM15T30AY is currently in active production status, providing supply chain continuity and long-term availability compared to the obsolete SMB15F26AY. The substitute component maintains identical moisture sensitivity level (MSL 1) and regulatory compliance (REACH Unaffected, ECCN EAR99).

The operating temperature range of the SM15T30AY (-40°C to 150°C) is narrower than the SMB15F26AY (-55°C to 175°C). Applications requiring operation below -40°C or above 150°C junction temperature require thermal analysis to confirm compatibility.

The package transition from SMBflat (DO-221AA) to SMC (DO-214AB) requires PCB layout modification. Both packages are standard surface mount formats with established manufacturing processes. Footprint redesign and revalidation are necessary for implementation.

Frequently Asked Questions (FAQ)

Q: Can the SM15T30AY directly replace the SMB15F26AY without PCB modification?

A: The SM15T30AY provides electrical equivalence but requires PCB footprint modification due to package change from SMBflat (DO-221AA) to SMC (DO-214AB). Direct socket replacement is not possible.

Q: What is the significance of the voltage parameter differences (26V vs. 25.6V standoff, 28.9V vs. 28.5V breakdown)?

A: The SM15T30AY reverse standoff voltage of 25.6V and breakdown voltage of 28.5V fall within acceptable tolerance of the SMB15F26AY specifications of 26V and 28.9V respectively. Both components maintain identical clamping performance at 53.5V, which is the critical parameter for transient suppression.

Q: Are there temperature range limitations when substituting the SM15T30AY?

A: The SM15T30AY operating temperature range (-40°C to 150°C junction temperature) is narrower than the SMB15F26AY (-55°C to 175°C). Applications requiring operation outside the -40°C to 150°C range require thermal design verification.

Q: Do both components meet automotive qualification requirements?

A: Both the SMB15F26AY and SM15T30AY carry automotive-grade classification with AEC-Q101 qualification, confirming suitability for automotive circuit protection applications.

Q: What packaging considerations apply to the substitution?

A: The SMB15F26AY uses SMBflat (DO-221AA) packaging while the SM15T30AY uses SMC (DO-214AB) packaging. Both are industry-standard surface mount packages with different footprint geometries. PCB layout redesign is required for implementation.

Q: Is the SM15T30AY available in the same packaging as the SMB15F26AY?

A: No. The SM15T30AY is supplied in Tape & Reel (TR) format with SMC package configuration. The SMB15F26AY used SMBflat packaging. Alternative sourcing of the SMB15F26AY in different packaging or identification of additional substitutes with SMBflat packaging may be necessary for specific manufacturing requirements.

Q: What is the current product status of each component?

A: The SMB15F26AY is classified as obsolete, indicating discontinued production and limited availability. The SM15T30AY is in active production status, ensuring ongoing supply and support.

Q: Are regulatory compliance attributes identical between the two components?

A: Both components share identical regulatory attributes: REACH Unaffected status, EAR99 ECCN classification, and MSL 1 (Unlimited) moisture sensitivity level. No regulatory barriers exist for substitution.