P6SMBJ20 Equivalent & Substitute Parts

Part Overview

The P6SMBJ20 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 17.1V reverse standoff voltage, 29.09V maximum clamping voltage, and 600W peak pulse power rating in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

P6SMBJ20

LittelfuseIn Stock: 792P6SMBJ20 Datasheet

Current PartRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

MFR RecommendedRFQ

SZP6SMB20AT3G

Littelfuse Inc.In Stock: 5473SZP6SMB20AT3G Datasheet

MFR RecommendedRFQ

SMBJP6KE20A-TP

Micro Commercial CoIn Stock: 30145SMBJP6KE20A-TP Datasheet

DirectRFQ

P6SMB20A

Eaton - Electronics DivisionIn Stock: 5158P6SMB20A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMBJ20 is determined by the following critical parameters:

• Reverse standoff voltage: 17.1V (Typ)
• Breakdown voltage minimum: 18-19V range
• Maximum clamping voltage: 27.7-29.09V
• Peak pulse current: 21.7-22A
• Peak pulse power: 600W
• Package type: DO-214AA or SMB (surface mount)
• Unidirectional channel configuration: 1 channel
• Operating temperature range: minimum -55°C, maximum 150°C or higher

All substitute parts listed maintain these electrical specifications within acceptable engineering tolerances and preserve the same surface-mount package footprint, ensuring direct PCB compatibility.

Parameter Comparison

Engineering Selection Recommendations

P6SMB20A (Eaton - Electronics Division) is the manufacturer-recommended substitute. This part maintains identical reverse standoff voltage (17.1V) and equivalent electrical performance with 27.7V clamping voltage and 21.7A peak pulse current. The part is in active production status with RoHS compliance and suitable for telecom applications.

SZP6SMB20AT3G (Littelfuse Inc.) is an active alternative from the original manufacturer. This part offers extended lower operating temperature range (-65°C vs -55°C) and includes AEC-Q101 automotive qualification. It is supplied in Tape & Reel packaging and maintains 22A peak pulse current matching the original specification.

SMBJP6KE20A-TP (Micro Commercial Co) provides the widest operating temperature range (-55°C to 175°C) and is available in high inventory volume. This part maintains 22A peak pulse current and is supplied in Tape & Reel packaging with ROHS3 compliance.

All three substitutes are electrically and mechanically compatible with the obsolete P6SMBJ20 for general-purpose transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can P6SMB20A replace P6SMBJ20 directly on the PCB? A: Yes. Both parts use the DO-214AA (SMB) package with identical footprint and pinout. No PCB layout modifications are required.

Q: What is the difference between 29.09V and 27.7V clamping voltage? A: Both values fall within acceptable engineering tolerance for TVS diode clamping performance. The 27.7V specification of substitute parts provides slightly lower clamping voltage, which is acceptable for overvoltage protection circuits designed for the 17.1V standoff voltage range.

Q: Why is SZP6SMB20AT3G rated for -65°C minimum temperature? A: This part includes AEC-Q101 automotive qualification, which requires extended temperature range testing. This makes it suitable for automotive and industrial applications requiring broader temperature performance.

Q: Does operating temperature range affect substitution compatibility? A: Operating temperature range affects application suitability. SMBJP6KE20A-TP extends to 175°C maximum, suitable for high-temperature environments. P6SMB20A and SZP6SMB20AT3G are rated to 150°C, appropriate for standard industrial and telecom applications.

Q: Are all substitutes RoHS compliant? A: Yes. P6SMB20A is RoHS Compliant. SZP6SMB20AT3G and SMBJP6KE20A-TP are ROHS3 Compliant, meeting current environmental regulations.

Q: What packaging options are available for these substitutes? A: P6SMB20A is supplied without specified packaging. SZP6SMB20AT3G and SMBJP6KE20A-TP are supplied in Tape & Reel (TR) packaging for automated assembly.