SMF12AT1 Equivalent & Substitute Parts Reference

Part Overview

The SMF12AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 12V reverse standoff voltage with a 19.9V maximum clamping voltage and 10.1A peak pulse current capability in a SOD-123FL package. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

SMF12AT1

onsemiIn Stock: 822SMF12AT1 Datasheet

Current PartRFQ

SMF12A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 6144SMF12A-E3-08 Datasheet

DirectRFQ

SMF11A

MDDIn Stock: 17334SMF11A Datasheet

SimilarRFQ

SMF13A

Diotec SemiconductorIn Stock: 20101SMF13A Datasheet

SimilarRFQ

SMF15A

MDDIn Stock: 29220SMF15A Datasheet

SimilarRFQ

SMF16A

MDDIn Stock: 20966SMF16A Datasheet

SimilarRFQ

SMF17A

Diotec SemiconductorIn Stock: 2034SMF17A Datasheet

SimilarRFQ

SMF18A

MDDIn Stock: 20944SMF18A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMF12AT1 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 12V
• Voltage - Clamping (Max) @ Ipp: 19.9V
• Current - Peak Pulse (10/1000µs): 10.1A
• Power - Peak Pulse: 200W
• Unidirectional Channels: 1
• Mounting Type: Surface Mount
• Type: Zener

Package Compatibility:

• Primary package: SOD-123F or equivalent mechanical footprint (DO-219AB/SMF)

Direct Equivalent: The SMF12A-E3-08 manufactured by Vishay General Semiconductor - Diodes Division is a direct functional equivalent, matching all critical electrical parameters (12V standoff, 19.9V clamping, 10.1A peak pulse, 200W power rating) while offering improved product status (Active) and RoHS3 compliance. This part is available in DO-219AB (SMF) package with identical electrical performance.

Similar Alternatives: The remaining substitute parts (SMF11A, SMF13A, SMF15A, SMF16A, SMF17A, SMF18A) represent voltage-variant alternatives within the SMF series. These parts maintain the same 200W power rating and surface-mount configuration but operate at different voltage levels. Selection among these alternatives depends on the specific voltage protection requirement of the application.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended): The SMF12A-E3-08 is the preferred substitute for the obsolete SMF12AT1. This part maintains identical electrical specifications (12V standoff, 19.9V clamping, 10.1A peak pulse) while offering active product status, ROHS3 compliance, and an extended operating temperature range (-65°C to 175°C versus -55°C to 150°C). The DO-219AB package is mechanically compatible with SOD-123F footprints in standard PCB designs. This part is available in high volume (6100 pcs in stock).

For Voltage-Variant Applications: When circuit protection requirements differ from the original 12V specification, the SMF series alternatives provide voltage-rated options from 11V to 18V standoff. All alternatives maintain the 200W power rating and surface-mount configuration. Selection should be based on the specific overvoltage threshold required by the protected circuit.

Compliance Considerations: All substitute parts listed are ROHS3 compliant, addressing regulatory requirements that the original SMF12AT1 does not meet. For applications requiring REACH compliance verification, SMF12A-E3-08, SMF11A, SMF15A, SMF16A, and SMF18A carry REACH Unaffected status. SMF13A and SMF17A require REACH information upon request.

Frequently Asked Questions (FAQ)

Q: Can SMF12A-E3-08 be used as a direct drop-in replacement for SMF12AT1? A: Yes. The SMF12A-E3-08 matches all critical electrical parameters (12V reverse standoff, 19.9V clamping voltage, 10.1A peak pulse current, 200W power rating) and is mechanically compatible with SOD-123F PCB layouts. The DO-219AB package footprint is equivalent to SOD-123F.

Q: What is the difference between SMF12A-E3-08 and SMF12AT1? A: The primary differences are product status (SMF12A-E3-08 is Active versus SMF12AT1 Obsolete), RoHS compliance (ROHS3 versus non-compliant), operating temperature range (-65°C to 175°C versus -55°C to 150°C), and manufacturer (Vishay versus onsemi). Electrical performance is identical.

Q: Can I use SMF11A or SMF13A instead of SMF12AT1? A: SMF11A and SMF13A are voltage-variant alternatives, not direct equivalents. SMF11A operates at 11V standoff with 18.2V clamping, while SMF13A operates at 13V standoff with 21.5V clamping. These parts are suitable only if your circuit protection requirement differs from the original 12V specification.

Q: Are all substitute parts available in the same package? A: Most substitute parts are available in SOD-123F or SMF/SOD-123FL packages. SMF12A-E3-08 uses DO-219AB (SMF) package, which is mechanically equivalent. Verify package compatibility with your PCB design before selection.

Q: What is the inventory status of these substitute parts? A: SMF12A-E3-08 has 6100 pcs in stock. Among voltage variants, SMF15A (29200 pcs), SMF13A (20075 pcs), SMF18A (20870 pcs), and SMF16A (20954 pcs) have the highest availability. SMF17A has limited stock (1930 pcs).

Q: Do all substitute parts meet RoHS requirements? A: Yes. All listed substitute parts are ROHS3 compliant. The original SMF12AT1 is RoHS non-compliant, making substitution necessary for applications requiring RoHS certification.