1SMB11AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB11AT3 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 11V reverse standoff voltage with an 18.2V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface mount applications using the DO-214AA (SMB) package. The 1SMB11AT3 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

1SMB11AT3

onsemiIn Stock: 53361SMB11AT3 Datasheet

Current PartRFQ

SMBJ11A

MeritekIn Stock: 50169SMBJ11A Datasheet

DirectRFQ

SMBJ11A

MeritekIn Stock: 50169SMBJ11A Datasheet

DirectRFQ

SMBJ11A-HR

Littelfuse Inc.In Stock: 777SMBJ11A-HR Datasheet

SimilarRFQ

SMBJ11A-HRA

Littelfuse Inc.In Stock: 1060SMBJ11A-HRA Datasheet

SimilarRFQ

SMBJ11A-TP

Micro Commercial CoIn Stock: 3671SMBJ11A-TP Datasheet

SimilarRFQ

SMBJ11AE3/TR13

Microchip TechnologyIn Stock: 1158SMBJ11AE3/TR13 Datasheet

SimilarRFQ

TV06B110JB-G

Comchip TechnologyIn Stock: 1254TV06B110JB-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMB11AT3 is determined by strict electrical and mechanical parameter matching across the following criteria:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 11V
• Voltage - Breakdown (Min): 12.2V
• Voltage - Clamping (Max) @ Ipp: 18.2V
• Current - Peak Pulse (10/1000µs): 33A (±0.03A tolerance acceptable)
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical Specifications): Parts meeting all critical electrical parameters with peak pulse current of 33A and identical voltage ratings.

Similar Substitutes (Equivalent Electrical Performance): Parts with peak pulse current of 32.97A (within acceptable tolerance) and identical voltage ratings, providing equivalent transient suppression performance.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the critical electrical specifications required for direct replacement of the 1SMB11AT3. Selection should be based on the following factors:

Product Status and Compliance: All substitute parts are classified as Active products, ensuring ongoing availability and manufacturer support. The 1SMB11AT3 is obsolete and no longer recommended for new designs.

RoHS Compliance: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements. The original 1SMB11AT3 is RoHS non-compliant and should be replaced in designs requiring RoHS compliance.

Temperature Operating Range:

• SMBJ11A-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C ~ 175°C), suitable for extended temperature applications.
• SMBJ11A-HR, SMBJ11A-HRA, and SMBJ11AE3/TR13 match the original -65°C ~ 150°C range.
• SMBJ11A (Meritek) and TV06B110JB-G operate at -55°C minimum, acceptable for standard industrial applications.

Inventory Availability: SMBJ11A (Meritek) offers the highest inventory level (50,100 pcs), followed by SMBJ11A-TP (3,634 pcs) and SMBJ11A-HRA (1,011 pcs).

Packaging: All substitute parts are supplied in Tape & Reel (TR) packaging, standard for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ11A (Meritek) be used as a direct replacement for 1SMB11AT3?

A: Yes. SMBJ11A meets all critical electrical parameters: 11V reverse standoff, 12.2V minimum breakdown, 18.2V maximum clamping voltage, and 32.97A peak pulse current (within acceptable tolerance of the original 33A specification). Both components use the DO-214AA (SMB) package and are rated for 600W peak pulse power.

Q: What is the difference between SMBJ11A-HR and SMBJ11A-HRA?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications (11V standoff, 18.2V clamping, 33A peak pulse). The primary difference is the series designation (SMBJ-HR vs. SMBJ-HRA). Both are suitable replacements for the 1SMB11AT3.

Q: Why is TV06B110JB-G listed as a similar substitute rather than a direct substitute?

A: TV06B110JB-G is manufactured by Comchip Technology and has a peak pulse current specification of 32.97A compared to the original 33A. While this represents a negligible difference in practical application, it is classified as similar rather than direct to maintain strict specification adherence. The component is electrically equivalent for transient suppression applications.

Q: Is the 1SMB11AT3 still available for purchase?

A: The 1SMB11AT3 is classified as obsolete by onsemi. While 5,290 pcs are reported in stock, new designs should transition to active substitute parts to ensure long-term supply chain stability and compliance with current regulatory standards.

Q: What are the key parameters that determine substitutability for this TVS diode?

A: Substitutability is determined by: reverse standoff voltage (11V), breakdown voltage (12.2V minimum), clamping voltage (18.2V maximum), peak pulse current (33A ±0.03A), power rating (600W), package type (DO-214AA/SMB), and diode type (unidirectional Zener). All listed substitutes meet these criteria.

Q: Does operating temperature range affect the choice of substitute?

A: Operating temperature range should be selected based on application requirements. SMBJ11A-TP supports -55°C ~ 175°C, offering the widest range. For applications requiring -65°C minimum operation, select SMBJ11A-HR, SMBJ11A-HRA, or SMBJ11AE3/TR13.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original 1SMB11AT3 is RoHS non-compliant. Designs requiring RoHS compliance must transition to one of the listed substitutes.