1SMB26AT3G Equivalent & Substitute Parts

Part Overview

The 1SMB26AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) package. This component is rated for 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 14.2A peak pulse current. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

1SMB26AT3G

Littelfuse Inc.In Stock: 1505091SMB26AT3G Datasheet

Current PartRFQ

SMBJ26A

EVVO SemiIn Stock: 39808SMBJ26A Datasheet

MFR RecommendedRFQ

SMBJ26A-HR

Littelfuse Inc.In Stock: 937SMBJ26A-HR Datasheet

MFR RecommendedRFQ

SMBJ26A-HRA

Littelfuse Inc.In Stock: 1118SMBJ26A-HRA Datasheet

MFR RecommendedRFQ

SMBJ26A

EVVO SemiIn Stock: 39808SMBJ26A Datasheet

MFR RecommendedRFQ

SMBJ26A

EVVO SemiIn Stock: 39808SMBJ26A Datasheet

MFR RecommendedRFQ

SMBJ26A-13-F

Diodes IncorporatedIn Stock: 416273SMBJ26A-13-F Datasheet

MFR RecommendedRFQ

SMBJ26A-TR

STMicroelectronicsIn Stock: 7108SMBJ26A-TR Datasheet

MFR RecommendedRFQ

SMBJ26AE3/TR13

Microchip TechnologyIn Stock: 971SMBJ26AE3/TR13 Datasheet

MFR RecommendedRFQ

SMBJ26E3/TR13

Microchip TechnologyIn Stock: 720SMBJ26E3/TR13 Datasheet

MFR RecommendedRFQ

TV06B260JB-G

Comchip TechnologyIn Stock: 12706TV06B260JB-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1SMB26AT3G is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 26V
• Voltage - Clamping (Max) @ Ipp: 42.1V
• Current - Peak Pulse (10/1000µs): 14.2A minimum
• Package / Case: DO-214AA, SMB
• Unidirectional configuration (single channel)
• Operating Temperature range: -65°C ~ 150°C or compatible

Substitute parts must maintain identical or equivalent electrical performance within these specifications. Package compatibility is mandatory for direct board-level replacement. All listed substitutes are active products from established manufacturers, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete 1SMB26AT3G, the following active parts are recommended based on electrical equivalence and package compatibility:

Primary Substitutes (Identical Package and Electrical Specifications):

• SMBJ26A-HR (Littelfuse Inc.) and SMBJ26A-HRA (Littelfuse Inc.) maintain the original manufacturer lineage with DO-214AA SMB packaging and full temperature range (-65°C ~ 150°C). Both are active products with established supply availability.
• SMBJ26AE3/TR13 (Microchip Technology) provides electrical equivalence with identical clamping voltage (42.1V) and peak pulse current (14.2A) in DO-214AA SMB package with full temperature range support.
• SMBJ26A-13-F (Diodes Incorporated) matches electrical specifications with 14.2A peak pulse current and DO-214AA SMB package. Operating temperature range is -55°C ~ 150°C, which is acceptable for most applications requiring the original -65°C minimum.

Secondary Substitutes (Minor Electrical Variations):

• SMBJ26A-TR (STMicroelectronics) offers higher peak pulse current (14.9A) in the same package, providing enhanced transient protection margin. Operating temperature range is -55°C ~ 150°C.
• TV06B260JB-G (Comchip Technology) provides equivalent clamping voltage (42.1V) and peak pulse current (14.25A) in DO-214AA SMB package. Operating temperature range is not specified.

Not Recommended for Direct Replacement:

• SMBJ26E3/TR13 (Microchip Technology) has a higher clamping voltage (46.6V) and lower peak pulse current (12.4A), making it unsuitable for applications requiring the original 42.1V clamping specification.
• SMBJ26A (EVVO Semi) uses DO-214AC SMA package instead of DO-214AA SMB, requiring PCB layout modification and is not a direct board-level replacement.

All recommended substitutes are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the original part's environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ26A (EVVO Semi) as a direct replacement? A: No. While SMBJ26A matches the electrical specifications, it uses DO-214AC SMA package instead of the original DO-214AA SMB package. This requires PCB footprint modification and is not a direct board-level substitute.

Q: What is the difference between SMBJ26A-HR and SMBJ26A-HRA? A: Both parts are manufactured by Littelfuse Inc. with identical electrical specifications (26V standoff, 42.1V clamping, 14.3A peak pulse) and DO-214AA SMB packaging. The -HRA variant represents a product line update. Both are suitable substitutes for the 1SMB26AT3G.

Q: Why is SMBJ26E3/TR13 not recommended? A: SMBJ26E3/TR13 has a clamping voltage of 46.6V and peak pulse current of 12.4A, which deviate from the original 42.1V clamping and 14.2A specifications. This part is not electrically equivalent and may not provide the same transient protection performance.

Q: Does the operating temperature range difference matter? A: For most applications, the difference between -65°C and -55°C minimum operating temperature is not critical. However, if your design requires operation at temperatures below -55°C, select substitutes with -65°C minimum rating: SMBJ26A-HR, SMBJ26A-HRA, SMBJ26AE3/TR13, or SMBJ26E3/TR13.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the environmental compliance of the original 1SMB26AT3G.

Q: Which substitute offers the best supply availability? A: SMBJ26A-13-F (Diodes Incorporated) has the highest inventory level at 416,200 pieces. SMBJ26A (EVVO Semi) has 39,700 pieces available. Both represent strong supply positions for long-term procurement.