SMA6F58AY Equivalent & Substitute Parts

Part Overview

The SMA6F58AY is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by STMicroelectronics, designed for surface mount applications in the SMAflat package configuration. This component provides transient overvoltage protection with a 58V reverse standoff voltage and 121V 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 ongoing production and field replacement requirements.

Substiute Parts

SMA6F58AY

STMicroelectronicsIn Stock: 740SMA6F58AY Datasheet

Current PartRFQ

SMA6T68AY

STMicroelectronicsIn Stock: 1980SMA6T68AY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SMA6F58AY is based on electrical parameter equivalence and mechanical compatibility. The primary substitute, SMA6T68AY, maintains identical electrical performance across all critical protection parameters: reverse standoff voltage (58.1V typical), breakdown voltage (64.6V minimum), clamping voltage (121V maximum), peak pulse current (33A at 8/20µs), and peak pulse power (600W). Both components are unidirectional Zener-type TVS diodes with single-channel configuration, automotive-grade qualification (AEC-Q101), and unlimited moisture sensitivity rating.

The key substitution criteria are:

• Voltage - Reverse Standoff: 58V to 58.1V (within tolerance)
• Voltage - Clamping (Max) @ Ipp: 121V (identical)
• Current - Peak Pulse (8/20µs): 33A (identical)
• Power - Peak Pulse: 600W (identical)
• Type: Zener, Unidirectional (identical)
• Grade: Automotive (identical)
• Qualification: AEC-Q101 (identical)

Package differences exist between the main part (SMAflat, DO-221AC) and the substitute (SMA, DO-214AC), requiring PCB layout verification for mechanical fit and thermal performance.

Parameter Comparison

Engineering Selection Recommendations

The SMA6T68AY is the qualified substitute for the obsolete SMA6F58AY based on electrical parameter equivalence and active product status. Both components carry identical automotive-grade qualification (AEC-Q101) and maintain the same protection performance specifications across voltage, current, and power parameters.

The operating temperature range of the substitute (−40°C to 150°C) is narrower than the main part (−55°C to 175°C). Applications requiring operation below −40°C or above 150°C require thermal performance validation against specific system requirements.

The package transition from SMAflat (DO-221AC) to SMA (DO-214AC) necessitates PCB layout modification. Physical dimensions, lead spacing, and thermal characteristics differ between these package types. Design verification must confirm mechanical fit, solder joint reliability, and thermal dissipation performance in the target application.

The SMA6T68AY is supplied in Cut Tape and Digi-Reel packaging with significantly higher inventory availability (1910 pieces) compared to the obsolete main part (668 pieces).

Frequently Asked Questions (FAQ)

Q: Can the SMA6T68AY directly replace the SMA6F58AY without PCB modification?

A: No. The package types differ (SMAflat DO-221AC versus SMA DO-214AC). PCB footprint, land pattern, and component placement require modification. Physical dimensions and lead configurations are not identical between these packages.

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

A: Yes. Both components provide identical clamping voltage (121V), peak pulse current (33A at 8/20µs), and peak pulse power (600W). Reverse standoff voltage is equivalent (58V versus 58.1V typical). Breakdown voltage is identical at 64.6V minimum.

Q: What is the impact of the narrower operating temperature range on the substitute?

A: The SMA6T68AY operates from −40°C to 150°C, compared to the main part's −55°C to 175°C range. Applications requiring operation outside the substitute's temperature range require alternative component selection or thermal management verification.

Q: Are both parts automotive-qualified?

A: Yes. Both the SMA6F58AY and SMA6T68AY carry automotive-grade classification with AEC-Q101 qualification, suitable for automotive and industrial applications requiring transient overvoltage protection.

Q: What packaging options are available for the substitute?

A: The SMA6T68AY is supplied in Cut Tape (CT) and Digi-Reel packaging, with 1910 pieces currently in stock. The main part was supplied in Tape & Reel format with lower inventory availability.

Q: Do both parts have identical moisture sensitivity ratings?

A: Yes. Both components have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture-related handling restrictions during storage, transport, or assembly.