P6SMB20A-E3/5B Equivalent & Substitute Parts

Part Overview

The P6SMB20A-E3/5B is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional surface mount device operates in the 17.1V reverse standoff voltage class and provides transient protection through a 27.7V clamping voltage with 21.7A peak pulse current capability. The part is housed in a DO-214AA (SMB) package and is RoHS3 compliant with unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Substiute Parts

P6SMB20A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 770P6SMB20A-E3/5B Datasheet

Current PartRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

DirectRFQ

SM6T22A

STMicroelectronicsIn Stock: 17939SM6T22A Datasheet

DirectRFQ

1KSMB20A

Taiwan Semiconductor CorporationIn Stock: 9021KSMB20A Datasheet

MFR RecommendedRFQ

SMBJP6KE20A-TP

Micro Commercial CoIn Stock: 30145SMBJP6KE20A-TP Datasheet

MFR RecommendedRFQ

SZP6SMB20AT3G

Littelfuse Inc.In Stock: 5473SZP6SMB20AT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB20A-E3/5B are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Voltage - Reverse Standoff (Typ): 17.1V
• Voltage - Clamping (Max) @ Ipp: 27.7V
• Voltage - Breakdown (Min): 19V
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Secondary Compatibility Factors:

• Current - Peak Pulse: 21.7A nominal (acceptable range: 21.7A to 36.1A)
• Power - Peak Pulse: 600W minimum
• Operating Temperature: -55°C to 175°C acceptable
• RoHS3 Compliance required
• MSL 1 rating required

All identified substitutes maintain the core voltage protection characteristics (17.1V standoff, 27.7V clamp) and surface mount SMB package form factor. Variations in peak pulse current and power dissipation represent enhanced or equivalent performance within the same protection class.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance):

P6SMB20A (Eaton), SMBJP6KE20A-TP (Micro Commercial Co), and SZP6SMB20AT3G (Littelfuse) are direct functional equivalents with matching 17.1V standoff, 27.7V clamp, and 19V breakdown voltages. All are RoHS3 compliant, active products in DO-214AA SMB packages. Selection among these three is based on inventory availability and supply chain preference. SZP6SMB20AT3G includes AEC-Q101 automotive qualification and extended temperature range (-65°C to 150°C), matching the original part's lower temperature limit.

Enhanced Performance Substitutes:

1KSMB20A (Taiwan Semiconductor) provides superior pulse current handling (36.1A vs. 21.7A) and increased power dissipation (1000W vs. 600W) while maintaining identical voltage protection parameters. This part is suitable for applications requiring higher transient energy absorption. Operating temperature extends to 175°C. RoHS3 compliant and active status confirmed.

Alternative Voltage Class:

SM6T22A (STMicroelectronics) operates in a higher voltage class (18.8V standoff, 30.6V clamp) with significantly higher peak pulse current (102A at 8/20µs pulse width). This part is not a direct substitute but represents an alternative protection level for circuits requiring higher voltage suppression. RoHS3 compliant and active status confirmed.

Frequently Asked Questions (FAQ)

Q: Can P6SMB20A (Eaton) directly replace P6SMB20A-E3/5B (Vishay)?

A: Yes. Both parts share identical electrical specifications: 17.1V reverse standoff voltage, 27.7V clamping voltage, 19V breakdown voltage, and DO-214AA SMB package. Both are RoHS3 compliant with MSL 1 rating. The primary difference is manufacturer and operating temperature range (Eaton: -55°C to 150°C vs. Vishay: -65°C to 150°C). Selection depends on application temperature requirements and supply availability.

Q: What is the difference between the 600W and 1000W power ratings?

A: Power rating indicates peak pulse dissipation capability. The 1KSMB20A (1000W) can absorb higher transient energy compared to the 600W variants. Both maintain identical voltage protection characteristics. Selection depends on the expected transient energy in the application circuit.

Q: Why does SM6T22A have different voltage specifications?

A: SM6T22A operates in a higher voltage protection class (18.8V standoff, 30.6V clamp vs. 17.1V standoff, 27.7V clamp). It is not a direct substitute but an alternative for circuits requiring higher voltage suppression. Peak pulse current is also significantly higher (102A). Use only if circuit design specifically requires this higher voltage class.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All identified substitutes use the DO-214AA (SMB) surface mount package with identical mechanical footprint and pinout. PCB layout compatibility is maintained across all parts.

Q: What does RoHS3 compliance mean for these parts?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All identified substitutes carry RoHS3 certification, ensuring regulatory compliance for EU and equivalent markets.

Q: Can I use SZP6SMB20AT3G in automotive applications?

A: SZP6SMB20AT3G carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Other substitutes are not explicitly qualified for automotive use unless specified by the application requirements.