SMF6.5AT1G Equivalent & Substitute Parts

Part Overview

The SMF6.5AT1G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 6.5V reverse standoff voltage, 11.2V maximum clamping voltage, and 17.9A peak pulse current capability in a SOD-123FL package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMF6.5AT1G

Littelfuse Inc.In Stock: 10465SMF6.5AT1G Datasheet

Current PartRFQ

SMF6.5A

MDDIn Stock: 23240SMF6.5A Datasheet

DirectRFQ

SMF7.0A

MDDIn Stock: 18332SMF7.0A Datasheet

MFR RecommendedRFQ

SMF7.5A

MDDIn Stock: 9125SMF7.5A Datasheet

MFR RecommendedRFQ

SMF8.0A

Diotec SemiconductorIn Stock: 38424SMF8.0A Datasheet

MFR RecommendedRFQ

SMF6.5A-TP

Micro Commercial CoIn Stock: 89650SMF6.5A-TP Datasheet

DirectRFQ

SMF6V5A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 9436SMF6V5A-E3-08 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF6.5AT1G are classified based on electrical parameter compatibility within the TVS diode category. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - Reverse Standoff (Typ): 6.5V nominal
• Voltage - Clamping (Max) @ Ipp: 11.2V maximum
• Current - Peak Pulse (10/1000µs): 17.9A minimum
• Power - Peak Pulse: 200W
• Type: Zener, Unidirectional
• Mounting Type: Surface Mount
• Package compatibility: SOD-123F or equivalent mechanical footprint

Direct Equivalents maintain identical electrical specifications across all critical parameters and are suitable for one-to-one replacement.

Manufacturer Alternatives provide the same voltage protection characteristics with minor variations in peak pulse current or clamping voltage within acceptable design tolerances, allowing substitution in applications where the exact specification is not mandatory.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): SMF6.5A (MDD) and SMF6.5A-TP (Micro Commercial Co) are direct electrical equivalents to the SMF6.5AT1G. Both parts maintain identical voltage standoff, clamping, and peak pulse current ratings. Both manufacturers provide ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). These parts are recommended as primary alternatives due to active product status and full specification alignment.

SMF6V5A-E3-08 (Vishay General Semiconductor - Diodes Division) is an electrical equivalent with identical performance specifications. This part uses the DO-219AB package designation, which is mechanically compatible with SOD-123F footprints. Vishay's eSMP® series designation indicates active product support. This option is suitable where Vishay component qualification is required.

Higher Voltage Alternatives (Modified Protection Characteristics): SMF7.0A, SMF7.5A, and SMF8.0A provide higher reverse standoff voltages (7.0V, 7.5V, and 8.0V respectively) with correspondingly higher clamping voltages. These parts are suitable only in applications where the circuit design permits higher voltage thresholds. Peak pulse current ratings decrease incrementally across this series (16.7A, 15.5A, and 14.71A respectively), which may impact transient suppression capability in high-current surge scenarios. All three maintain 200W peak pulse power rating and active product status.

Frequently Asked Questions (FAQ)

Q: Can SMF6.5A replace SMF6.5AT1G directly? A: Yes. SMF6.5A manufactured by MDD provides identical electrical specifications: 6.5V reverse standoff, 11.2V clamping voltage, and 17.9A peak pulse current. The part is in active production status and maintains the same SOD-123F package footprint. This is a direct one-to-one replacement.

Q: What is the difference between SMF6.5A-TP and SMF6.5A? A: SMF6.5A-TP is supplied in Tape & Reel (TR) packaging by Micro Commercial Co, while SMF6.5A from MDD also uses Tape & Reel packaging. Both parts have identical electrical specifications and are suitable for automated assembly. The "-TP" designation indicates tape and reel format. Selection depends on supplier availability and procurement requirements.

Q: Can I use SMF7.0A, SMF7.5A, or SMF8.0A as substitutes? A: These parts have higher reverse standoff voltages and clamping voltages than the original SMF6.5AT1G. They are suitable only if your circuit design permits higher protection thresholds. The peak pulse current capability decreases in this series, which may reduce transient suppression performance in high-current applications. Verify circuit requirements before substitution.

Q: Is SMF6V5A-E3-08 compatible with the original SOD-123F footprint? A: Yes. SMF6V5A-E3-08 uses the DO-219AB package designation, which is mechanically compatible with SOD-123F land patterns. Electrical specifications are identical to SMF6.5AT1G. This part is manufactured by Vishay and maintains active product status.

Q: Why is SMF6.5AT1G listed as obsolete? A: Littelfuse has discontinued this specific part number. Direct equivalents from other manufacturers (SMF6.5A, SMF6.5A-TP, SMF6V5A-E3-08) provide identical performance and are in active production, making them suitable long-term alternatives for new designs and ongoing procurement.

Q: What compliance certifications apply to these substitute parts? A: All direct equivalents (SMF6.5A, SMF6.5A-TP, SMF6V5A-E3-08) are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is MSL 1 (unlimited) for all direct equivalents, indicating no special storage or handling requirements.