1SMB17AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB17AT3 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose transient protection applications. This component features a 17V reverse standoff voltage with a 27.6V maximum clamping voltage and 21.7A peak pulse current capability in a surface-mount SMB (DO-214AA) package. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

1SMB17AT3

onsemiIn Stock: 10291SMB17AT3 Datasheet

Current PartRFQ

SMBJ17A

MeritekIn Stock: 15470SMBJ17A Datasheet

DirectRFQ

SMBJ17A

MeritekIn Stock: 15470SMBJ17A Datasheet

DirectRFQ

SMBJ17A

MeritekIn Stock: 15470SMBJ17A Datasheet

DirectRFQ

SMBJ17A-HR

Littelfuse Inc.In Stock: 737SMBJ17A-HR Datasheet

SimilarRFQ

SMBJ17A-HRA

Littelfuse Inc.In Stock: 1024SMBJ17A-HRA Datasheet

SimilarRFQ

SMBJ17A-TP

Micro Commercial CoIn Stock: 1180SMBJ17A-TP Datasheet

SimilarRFQ

SMBJ17AE3/TR13

Microchip TechnologyIn Stock: 670SMBJ17AE3/TR13 Datasheet

SimilarRFQ

SMBJ17E3/TR13

Microchip TechnologyIn Stock: 652SMBJ17E3/TR13 Datasheet

SimilarRFQ

TV06B170J-G

Comchip TechnologyIn Stock: 912TV06B170J-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMB17AT3 is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters that define substitutability are:

• Voltage - Reverse Standoff (Typ): 17V
• Voltage - Breakdown (Min): 18.9V
• Voltage - Clamping (Max) @ Ipp: 27.6V (with tolerance for minor variations up to 30.5V in specific applications)
• Current - Peak Pulse (10/1000µs): 21.7A minimum
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB) surface mount
• Unidirectional configuration: 1 channel

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications (17V standoff, 27.6V clamping, 21.7A+ peak pulse current) and active product status.

Similar Equivalents: Parts with matching core electrical parameters but minor variations in peak pulse current (±0.1A) or clamping voltage within acceptable tolerance, or with extended operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the core electrical requirements for direct replacement of the 1SMB17AT3. Selection should be based on the following criteria:

For RoHS Compliance Requirements: All active substitute parts (SMBJ17A, SMBJ17A-HR, SMBJ17A-HRA, SMBJ17A-TP, SMBJ17AE3/TR13, and TV06B170J-G) are ROHS3 compliant, whereas the original 1SMB17AT3 is RoHS non-compliant. New designs should prioritize these compliant alternatives.

For Extended Temperature Range: SMBJ17A-TP (Micro Commercial Co) supports -55°C ~ 175°C operating temperature, providing the widest thermal envelope among available substitutes.

For Standard Temperature Range: SMBJ17A-HR, SMBJ17A-HRA, SMBJ17AE3/TR13, and the original specification (-65°C ~ 150°C) are matched by SMBJ17A-HR, SMBJ17A-HRA, and SMBJ17AE3/TR13.

For Availability and Supply Chain: SMBJ17A (Meritek) offers the highest inventory level (15,419 pcs), followed by SMBJ17A-HRA (920 pcs) and SMBJ17A-TP (1,104 pcs).

For Packaging Specification: All substitutes are supplied in DO-214AA (SMB) surface-mount packages with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's mechanical requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ17A (Meritek) directly replace 1SMB17AT3 in existing designs?

A: Yes. SMBJ17A matches all critical electrical parameters: 17V reverse standoff, 18.9V breakdown minimum, 27.6V clamping maximum, and 21.74A peak pulse current. The DO-214AA (SMB) package is identical. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What is the difference between SMBJ17A-HR and SMBJ17A-HRA?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications (17V standoff, 27.6V clamping, 21.8A peak pulse). The suffix designations (-HR vs. -HRA) indicate different internal design variants or manufacturing revisions, but electrical performance is equivalent for substitution purposes.

Q: Why does SMBJ17E3/TR13 (Microchip) appear in the substitute list if its clamping voltage is 30.5V instead of 27.6V?

A: SMBJ17E3/TR13 is listed as a similar equivalent rather than a direct equivalent due to the 30.5V clamping voltage specification, which exceeds the 1SMB17AT3's 27.6V maximum. This part is suitable only for applications where higher clamping voltage is acceptable and does not compromise circuit protection requirements.

Q: Are all substitute parts available in tape and reel (TR) packaging?

A: Most substitutes are available in tape and reel packaging for automated assembly. SMBJ17A (Meritek) packaging specification is not explicitly detailed in available data. Confirm packaging format with the supplier before procurement.

Q: What compliance certifications apply to these substitute parts?

A: All active substitute parts are ROHS3 compliant and REACH unaffected. All parts carry ECCN EAR99 classification and HTSUS code 8541.10.0080. The original 1SMB17AT3 is RoHS non-compliant, making the substitutes preferable for new designs subject to environmental regulations.

Q: Can SMBJ17A-TP be used in applications requiring the original -65°C lower temperature limit?

A: SMBJ17A-TP supports -55°C ~ 175°C operating temperature, which does not meet the -65°C lower limit of the original 1SMB17AT3. For applications requiring -65°C operation, select SMBJ17A-HR, SMBJ17A-HRA, or SMBJ17AE3/TR13.