SMF6.5AT1 Equivalent & Substitute Parts

Part Overview

The SMF6.5AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. It features a 6.5V reverse standoff voltage with an 11.2V maximum clamping voltage and 17.9A peak pulse current capability in a surface-mount SOD-123FL package. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	6.5V
Voltage - Breakdown (Min)	7.22V
Voltage - Clamping (Max) @ Ipp	11.2V
Current - Peak Pulse (10/1000µs)	17.9A
Power - Peak Pulse	200W
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	SOD-123F
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SMF6.5AT1 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 6.5V to maintain circuit protection threshold
Voltage - Clamping (Max) @ Ipp: Must be 11.2V to ensure clamping performance
Current - Peak Pulse (10/1000µs): Must be 17.9A to handle transient energy
Power - Peak Pulse: Must be 200W for thermal capability
Type: Zener unidirectional configuration
Mounting Type: Surface mount compatibility
Package Compatibility: SOD-123F or equivalent mechanical footprint

The substitute parts are grouped based on exact electrical parameter matching while allowing for package variations (SOD-123F to DO-219AB/SMF) and manufacturer differences. All candidates maintain the core protection specifications required for direct circuit substitution.

Parameter Comparison

Parameter	SMF6.5AT1 (onsemi)	SMF6V5A-E3-08 (Vishay)	SMF7.0A (MDD)	SMF7.5A (MDD)	SMF8.0A (Diotec)
Voltage - Reverse Standoff (Typ)	6.5V	6.5V	7V	7.5V	8V
Voltage - Breakdown (Min)	7.22V	7.22V	7.78V	8.33V	8.8V
Voltage - Clamping (Max) @ Ipp	11.2V	11.2V	12V	12.9V	13.6V
Current - Peak Pulse (10/1000µs)	17.9A	17.9A	16.7A	15.5A	14.71A
Power - Peak Pulse	200W	200W	200W	200W	200W
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C
Package / Case	SOD-123F	DO-219AB (SMF)	SOD-123F, SMF	SOD-123F, SMF	SOD-123F
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

Direct Equivalent (Preferred):

SMF6V5A-E3-08 (Vishay General Semiconductor - Diodes Division) is the primary substitute for SMF6.5AT1. This part maintains identical electrical specifications: 6.5V reverse standoff voltage, 11.2V clamping voltage, and 17.9A peak pulse current. The package transitions from SOD-123FL to DO-219AB (SMF), which is mechanically compatible with standard SMF footprints. The part is active in production with ROHS3 compliance and an extended operating temperature range (-65°C ~ 175°C), providing superior environmental performance compared to the obsolete original.

Alternative Substitutes (Application-Dependent):

SMF7.0A, SMF7.5A, and SMF8.0A are higher voltage alternatives suitable only for applications where the circuit can tolerate elevated reverse standoff and clamping voltages. These parts are not direct electrical equivalents but may be acceptable in designs with voltage margin. All three are active products with ROHS3 compliance (except SMF8.0A with undefined RoHS status). Selection among these alternatives depends on specific circuit protection requirements and voltage tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can SMF6V5A-E3-08 replace SMF6.5AT1 directly?

A: Yes. SMF6V5A-E3-08 is a direct electrical equivalent with identical voltage and current specifications. The package change from SOD-123FL to DO-219AB (SMF) is mechanically compatible with standard surface-mount footprints designed for SMF packages.

Q: Why are SMF7.0A, SMF7.5A, and SMF8.0A listed as substitutes if they have different voltage ratings?

A: These parts are listed as available alternatives but are not direct equivalents. They feature higher reverse standoff and clamping voltages, making them suitable only for applications where the circuit design permits elevated protection thresholds. Use these only if your application specifications allow for higher voltage operation.

Q: What is the difference between SOD-123F and DO-219AB (SMF) packages?

A: Both are surface-mount packages with compatible footprints for general-purpose TVS diode applications. DO-219AB is the formal designation for the SMF package. Standard PCB layouts designed for SMF packages will accommodate both variants without modification.

Q: Is RoHS compliance important for this substitution?

A: The original SMF6.5AT1 is RoHS non-compliant. If your application or supply chain requires RoHS compliance, SMF6V5A-E3-08, SMF7.0A, and SMF7.5A all meet ROHS3 standards. SMF8.0A has undefined RoHS status and should be verified with the manufacturer if compliance is required.

Q: What is the operating temperature difference between SMF6.5AT1 and SMF6V5A-E3-08?

A: SMF6.5AT1 operates from -55°C to 150°C, while SMF6V5A-E3-08 extends to -65°C to 175°C. The Vishay part provides a wider temperature range, offering better performance in extreme thermal environments.

Q: Can I use SMF7.0A or SMF7.5A in a circuit designed for 6.5V protection?

A: These parts will not trigger protection at the same voltage threshold as the original design. They are suitable only if your circuit can tolerate delayed protection activation at higher voltage levels. Verify circuit requirements before substitution.

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