SMF13AT1 Equivalent & Substitute Parts

Part Overview

The SMF13AT1 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 13V reverse standoff with a 21.5V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface-mount applications using the SOD-123F package. The SMF13AT1 is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMF13AT1

onsemiIn Stock: 762SMF13AT1 Datasheet

Current PartRFQ

SMF13A-TP

Micro Commercial CoIn Stock: 13960SMF13A-TP Datasheet

DirectRFQ

SMF11A

MDDIn Stock: 17334SMF11A Datasheet

SimilarRFQ

SMF12A

MDDIn Stock: 26418SMF12A Datasheet

SimilarRFQ

SMF15A

MDDIn Stock: 29220SMF15A Datasheet

SimilarRFQ

SMF16A

MDDIn Stock: 20966SMF16A Datasheet

SimilarRFQ

SMF17A

Diotec SemiconductorIn Stock: 2034SMF17A Datasheet

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SMF18A

MDDIn Stock: 20944SMF18A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF13AT1 are identified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Unidirectional channel configuration (1 channel)
• Reverse standoff voltage tolerance range (±1V to ±2V from 13V nominal)
• Clamping voltage compatibility (within ±3V of 21.5V)
• Peak pulse current rating (within ±1A of 9.3A)
• Power dissipation capacity (200W minimum)
• Surface-mount package compatibility (SOD-123F or equivalent SMF package)
• Operating temperature range support (-55°C minimum, 150°C minimum)

Direct Equivalent: SMF13A-TP from Micro Commercial Co meets all electrical specifications identically to the SMF13AT1 while offering active product status and RoHS3 compliance.

Similar Alternatives: SMF11A, SMF12A, SMF15A, SMF16A, SMF17A, and SMF18A provide alternative voltage ratings within the SMF series. These parts maintain the same package footprint and power rating but operate at different reverse standoff voltages, making them suitable for applications requiring voltage adjustment or where the exact 13V rating is not critical.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: SMF13A-TP is the recommended direct substitute for SMF13AT1. It provides identical electrical specifications with active product status and RoHS3 compliance, eliminating obsolescence concerns while maintaining full functional compatibility.

For Voltage-Adjusted Applications: When circuit design permits voltage tolerance adjustment, alternative SMF series parts offer active status and compliance benefits:

• SMF11A and SMF12A provide lower voltage ratings suitable for reduced-voltage protection schemes
• SMF15A, SMF16A, SMF17A, and SMF18A provide higher voltage ratings for elevated-voltage protection requirements

All alternative parts maintain the same 200W power dissipation capacity and surface-mount package footprint, ensuring mechanical compatibility with existing PCB layouts.

Compliance Considerations: All substitute parts listed are RoHS3 compliant, addressing regulatory requirements that the obsolete SMF13AT1 does not meet. This compliance status is relevant for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can SMF13A-TP be used as a direct replacement for SMF13AT1? A: Yes. SMF13A-TP matches all electrical specifications of SMF13AT1 identically: 13V reverse standoff, 21.5V clamping voltage, 9.3A peak pulse current, and 200W power rating. Both use the SOD-123F package. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between SMF13A-TP and the other SMF series alternatives? A: SMF13A-TP is electrically identical to SMF13AT1. Other SMF series parts (SMF11A through SMF18A) operate at different reverse standoff voltages ranging from 11V to 18V. These alternatives are suitable only if your circuit design can accommodate the different voltage rating and corresponding clamping voltage.

Q: Are all substitute parts compatible with the same PCB footprint? A: Yes. All listed substitute parts use either SOD-123F or equivalent SMF package configurations, ensuring mechanical compatibility with existing PCB layouts designed for SMF13AT1.

Q: Does operating temperature range affect substitution compatibility? A: SMF13A-TP offers an extended operating temperature range (-65°C to 175°C) compared to SMF13AT1 (-55°C to 150°C), providing additional margin for demanding thermal environments. Other alternatives maintain the -55°C to 150°C range. Verify your application's temperature requirements before selection.

Q: What is the significance of RoHS compliance for these parts? A: All substitute parts are RoHS3 compliant, whereas SMF13AT1 is RoHS non-compliant. RoHS compliance is mandatory for many applications and markets. If your design is subject to RoHS directives, substitute parts are required.

Q: Can I use SMF11A or SMF12A if my circuit operates below 13V? A: SMF11A (11V standoff) and SMF12A (12V standoff) are suitable only if your circuit design specifically requires lower voltage protection thresholds. These parts will trigger at lower transient voltages than SMF13AT1, potentially affecting circuit behavior. Verify compatibility with your transient voltage profile before substitution.

Q: What packaging options are available for substitute parts? A: SMF13A-TP is supplied in Tape & Reel (TR) packaging. Most alternative SMF series parts are also available in Tape & Reel format. Verify packaging requirements with your procurement process, as some alternatives may have different packaging availability.