SMF58AT1G Equivalent & Substitute Parts

Part Overview

The SMF58AT1G 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 58V reverse standoff voltage with a 93.6V maximum clamping voltage and 2.1A peak pulse current capability in a compact SOD-123FL package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

SMF58AT1G

Littelfuse Inc.In Stock: 10310SMF58AT1G Datasheet

Current PartRFQ

SMF58A

MeritekIn Stock: 19292SMF58A Datasheet

DirectRFQ

SMF58A-T13

Littelfuse Inc.In Stock: 1195SMF58A-T13 Datasheet

DirectRFQ

SMF48A

MeritekIn Stock: 22729SMF48A Datasheet

MFR RecommendedRFQ

SMF54A

Diotec SemiconductorIn Stock: 35342SMF54A Datasheet

MFR RecommendedRFQ

SMF58A-TP

Micro Commercial CoIn Stock: 3429SMF58A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMF58AT1G is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 58V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 93.6V (exact match required)
• Current - Peak Pulse: 2.1A minimum
• Power - Peak Pulse: 200W minimum
• Package / Case: SOD-123F (mechanical and electrical compatibility)
• Unidirectional Channels: 1 (functional requirement)

Secondary Compatibility Factors:

• Operating temperature range must encompass or exceed -55°C to 150°C
• RoHS3 compliance required for environmental standards
• Surface mount capability on SOD-123FL supplier package

Parts meeting all primary criteria are classified as direct substitutes. Parts with voltage parameters outside the specified range are classified as alternative solutions for applications where voltage tolerance permits.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Parameters):

SMF58A-T13 (Littelfuse Inc.) and SMF58A (Meritek) are direct functional equivalents with matching 58V reverse standoff and 93.6V clamping specifications. SMF58A-T13 maintains Littelfuse manufacturing continuity with active product status and standard tape & reel packaging. SMF58A offers equivalent performance from an alternative manufacturer with higher inventory availability (19,200 units).

SMF58A-TP (Micro Commercial Co) provides identical electrical specifications with an extended operating temperature range (-65°C to 175°C), offering enhanced thermal performance for applications requiring operation beyond standard industrial limits. All three parts maintain ROHS3 compliance and SOD-123F package compatibility.

Alternative Solutions (Modified Voltage Parameters):

SMF48A and SMF54A are alternative TVS diodes within the SMF series with lower reverse standoff voltages (48V and 54V respectively) and correspondingly reduced clamping voltages. These parts are suitable only for applications where the lower voltage threshold is acceptable and provides adequate protection margins for the protected circuit.

Procurement Considerations:

All substitute parts carry active product status with established supply chains. SMF58A-T13 is recommended for designs requiring manufacturer continuity with Littelfuse. SMF58A-TP is recommended for applications with extended temperature requirements. SMF48A and SMF54A should be selected only when circuit design permits operation at reduced voltage thresholds.

Frequently Asked Questions (FAQ)

Q: Can SMF58A replace SMF58AT1G directly in existing designs?

A: Yes. SMF58A matches the critical electrical parameters (58V reverse standoff, 93.6V clamping, 2.1A peak pulse) and package specification (SOD-123F). The part is pin-compatible and functionally equivalent. Meritek manufacturing provides an alternative source with active product status.

Q: What is the difference between SMF58A-T13 and SMF58A-TP?

A: Both are direct electrical equivalents of SMF58AT1G. SMF58A-T13 is manufactured by Littelfuse Inc. with standard operating temperature range (-55°C to 150°C). SMF58A-TP is manufactured by Micro Commercial Co with extended operating temperature range (-65°C to 175°C). Selection depends on thermal requirements and preferred manufacturer.

Q: Can SMF48A or SMF54A be used as substitutes?

A: SMF48A and SMF54A are not direct substitutes. These parts have lower reverse standoff voltages (48V and 54V) and lower clamping voltages (77.4V and 87.1V). They are suitable only for applications where the circuit design permits operation at these reduced voltage thresholds. Use only if circuit protection requirements are satisfied at lower voltage levels.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original SMF58AT1G.

Q: What packaging formats are available for the substitute parts?

A: Direct substitutes are available in tape & reel (TR) packaging for automated assembly. SMF58A-T13 and SMF58A-TP are standard tape & reel configurations. SMF58A is supplied in tape & reel format. All maintain SOD-123F package dimensions for PCB compatibility.

Q: Is there a preferred substitute for new designs?

A: For new designs, SMF58A-T13 (Littelfuse) or SMF58A-TP (Micro Commercial Co) are recommended. Both provide active product status, established supply chains, and full electrical equivalence. SMF58A-TP offers extended temperature range for applications requiring enhanced thermal performance.