SMA6F48A Equivalent & Substitute Parts

Part Overview

The SMA6F48A is a unidirectional transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage with a 100V maximum clamping voltage and 40A peak pulse current capability in an SMAflat surface-mount package.

The SMA6F48A is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating available packaging and supplier options.

Substiute Parts

SMA6F48A

STMicroelectronicsIn Stock: 10607SMA6F48A Datasheet

Current PartRFQ

SMA6J48A-TR

STMicroelectronicsIn Stock: 30409SMA6J48A-TR Datasheet

SimilarRFQ

SMA6L48A

Littelfuse Inc.In Stock: 912SMA6L48A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA6F48A is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.2V to 53.3V range
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Surface Mount
• Operating Temperature Range: Minimum -55°C, Maximum 175°C or higher

Secondary Compatibility Factors:

• Current - Peak Pulse (8/20µs): 40A or greater
• Voltage - Clamping (Max) @ Ipp: 100V or lower
• Power - Peak Pulse: 600W or greater
• Package / Case: DO-221AC (SMAflat) or DO-214AC (SMA) equivalents

Substitute parts are grouped based on whether they maintain these electrical specifications while accommodating variations in packaging format and supplier availability. Parts that deviate from the primary criteria in voltage standoff, breakdown voltage, or channel configuration are not valid substitutes.

Parameter Comparison

Engineering Selection Recommendations

SMA6J48A-TR (STMicroelectronics)

The SMA6J48A-TR is an active-status substitute manufactured by STMicroelectronics. It maintains identical voltage standoff (48V), breakdown voltage (53.3V), peak pulse current (40A), and operating temperature range (-55 to 175°C) as the SMA6F48A. The clamping voltage is lower at 88.4V compared to the original 100V specification. The package format differs (DO-214AC SMA versus DO-221AC SMAflat), requiring PCB layout verification. This part is ROHS3 compliant and available in Tape & Reel packaging. Selection of this substitute is appropriate when PCB footprint compatibility with DO-214AC SMA packages can be accommodated.

SMA6L48A (Littelfuse Inc.)

The SMA6L48A is an active-status substitute manufactured by Littelfuse Inc. It maintains identical voltage standoff (48V), breakdown voltage (53.3V), and package format (DO-221AC SMA Flat Leads) as the SMA6F48A. The peak pulse current is significantly lower at 7.8A compared to the original 40A specification. The operating temperature maximum is reduced to 150°C versus the original 175°C. This part is ROHS3 compliant and available in Tape & Reel packaging. Selection of this substitute is appropriate only for applications where peak pulse current requirements do not exceed 7.8A and operating temperatures remain below 150°C.

Frequently Asked Questions (FAQ)

Q: Can the SMA6J48A-TR directly replace the SMA6F48A on existing PCBs?

A: The SMA6J48A-TR uses a different package format (DO-214AC SMA versus DO-221AC SMAflat). While both are surface-mount packages, the physical footprints differ. PCB layout verification is required to confirm pad compatibility and trace routing feasibility before substitution.

Q: What is the primary difference between the SMA6J48A-TR and SMA6L48A substitutes?

A: The SMA6J48A-TR maintains the 40A peak pulse current rating of the original SMA6F48A, while the SMA6L48A is rated for only 7.8A peak pulse current. For applications requiring the full 40A pulse handling capability, the SMA6J48A-TR is the appropriate choice. The SMA6L48A is suitable only for lower-current protection circuits.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the SMA6J48A-TR and SMA6L48A are ROHS3 compliant. The original SMA6F48A does not specify RoHS status in the provided data.

Q: What is the impact of the lower clamping voltage in the SMA6J48A-TR?

A: The SMA6J48A-TR has a maximum clamping voltage of 88.4V compared to the SMA6F48A's 100V. This lower clamping voltage provides tighter voltage regulation during transient events, which may be beneficial for sensitive downstream components. Circuit analysis is required to confirm this characteristic is acceptable for the specific application.

Q: Can the SMA6L48A be used in high-temperature applications?

A: The SMA6L48A has a maximum operating temperature of 150°C, compared to the SMA6F48A's 175°C. Applications requiring operation above 150°C must use the SMA6J48A-TR, which maintains the full 175°C temperature rating.

Q: What packaging formats are available for these substitutes?

A: The SMA6J48A-TR and SMA6L48A are both supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The original SMA6F48A was available in bulk packaging. Tape & Reel format is standard for high-volume production and is compatible with standard pick-and-place equipment.

Q: Are there any compliance or regulatory differences between the substitutes?

A: Both substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the original SMA6F48A. Both are ROHS3 compliant. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all three parts, indicating no special moisture handling requirements.