P6SMB20AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB20AT3G 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 17.1V reverse standoff voltage with a 27.7V maximum clamping voltage and 22A peak pulse current capability in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMB20AT3G

Littelfuse Inc.In Stock: 16218P6SMB20AT3G Datasheet

Current PartRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

DirectRFQ

1KSMB20A

Taiwan Semiconductor CorporationIn Stock: 9021KSMB20A Datasheet

MFR RecommendedRFQ

SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

MFR RecommendedRFQ

TPSMB20A

Littelfuse Inc.In Stock: 1223TPSMB20A Datasheet

MFR RecommendedRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

DirectRFQ

SMBJP6KE20A-TP

Micro Commercial CoIn Stock: 30145SMBJP6KE20A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMB20AT3G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 17.1V ± tolerance
• Voltage - Breakdown (Min): 19V minimum
• Voltage - Clamping (Max) @ Ipp: 27.7V maximum
• Current - Peak Pulse (10/1000µs): minimum 22A
• Power - Peak Pulse: minimum 600W
• Type: Unidirectional Zener diode

Mechanical Compatibility Criteria:

• Package / Case: DO-214AA (SMB) or equivalent surface-mount package
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance Criteria:

• RoHS Status: ROHS3 Compliant or equivalent
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: direct equivalents (matching all electrical parameters within specification) and functional alternatives (meeting or exceeding electrical requirements with compatible packaging).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

P6SMB20A (Eaton - Electronics Division) and SMBJP6KE20A-TP (Micro Commercial Co) are direct electrical equivalents to the P6SMB20AT3G. Both maintain the 17.1V reverse standoff voltage, 27.7V clamping voltage, and 22A peak pulse current. Both are active products with ROHS3 compliance. P6SMB20A is suitable for general telecom applications, while SMBJP6KE20A-TP is packaged in Tape & Reel format for high-volume production environments.

TPSMB20A (Littelfuse Inc.) is an active equivalent from the original manufacturer with identical electrical specifications and extended operating temperature range (-65°C ~ 175°C). This part carries automotive-grade qualification (AEC-Q101), making it suitable for automotive and harsh-environment applications.

Enhanced Performance Alternative:

1KSMB20A (Taiwan Semiconductor Corporation) exceeds the electrical requirements of the P6SMB20AT3G with 36.1A peak pulse current and 1000W peak pulse power, providing enhanced transient protection margin. This part is active and ROHS3 compliant with an extended operating temperature range (-55°C ~ 175°C).

Limited Compatibility Alternative:

SMBJ18A (EVVO Semi) operates at a slightly higher reverse standoff voltage (18V) and clamping voltage (29.2V) with reduced peak pulse current (20.6A). This part is suitable only when the higher voltage thresholds are acceptable within the circuit design. Package compatibility requires verification as this part uses DO-214AC (SMA) instead of DO-214AA (SMB).

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB20A as a direct replacement for P6SMB20AT3G?

A: Yes. P6SMB20A maintains identical electrical specifications (17.1V reverse standoff, 27.7V clamping, 22A peak pulse current) and is packaged in the same DO-214AA (SMB) format. Both are ROHS3 compliant. The primary difference is manufacturer (Eaton vs. Littelfuse) and product status (active vs. obsolete).

Q: What is the advantage of using 1KSMB20A over the original part?

A: 1KSMB20A provides enhanced transient protection with 36.1A peak pulse current and 1000W peak pulse power, compared to 22A and 600W in the P6SMB20AT3G. This higher rating provides additional safety margin for transient events. The part is active and ROHS3 compliant with extended temperature range support.

Q: Is TPSMB20A suitable for automotive applications?

A: Yes. TPSMB20A carries automotive-grade qualification (AEC-Q101) and is rated for extended operating temperatures (-65°C ~ 175°C). It maintains identical electrical specifications to the P6SMB20AT3G and is packaged in DO-214AA (SMB) format.

Q: Why is SMBJ18A listed as a limited compatibility option?

A: SMBJ18A operates at higher voltage thresholds (18V reverse standoff, 29.2V clamping) and lower peak pulse current (20.6A) than the P6SMB20AT3G. Additionally, it uses DO-214AC (SMA) packaging instead of DO-214AA (SMB), requiring PCB layout verification. Use only when circuit design tolerates these parameter variations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements. P6SMB20A carries standard RoHS compliance. All others are ROHS3 compliant.

Q: What packaging formats are available for these substitutes?

A: P6SMB20A and TPSMB20A are supplied in standard packaging. SMBJP6KE20A-TP is packaged in Tape & Reel (TR) format for automated assembly. 1KSMB20A is available in Tape & Reel format. SMBJ18A uses Cut Tape (CT) and Digi-Reel packaging. Verify packaging compatibility with your procurement and assembly requirements.