P6SMBJ68 Equivalent & Substitute Parts

Part Overview

The P6SMBJ68 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 58.1V reverse standoff voltage with a 96.6V maximum clamping voltage at peak pulse current of 6.6A. The device is housed in a DO-214AA (SMB) surface mount package and is designed for general purpose transient voltage suppression applications across an operating temperature range of -55°C to 150°C.

The P6SMBJ68 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

P6SMBJ68

Littelfuse Inc.In Stock: 1230P6SMBJ68 Datasheet

Current PartRFQ

P6SMB68A

Eaton - Electronics DivisionIn Stock: 32269P6SMB68A Datasheet

MFR RecommendedRFQ

SMBJP6KE68A-TP

Micro Commercial CoIn Stock: 5551SMBJP6KE68A-TP Datasheet

DirectRFQ

P6SMB68A

Eaton - Electronics DivisionIn Stock: 32269P6SMB68A Datasheet

MFR RecommendedRFQ

SM6T68A

STMicroelectronicsIn Stock: 125258SM6T68A Datasheet

MFR RecommendedRFQ

SM6T68AY

STMicroelectronicsIn Stock: 980SM6T68AY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ68 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range for circuit protection
• Current - Peak Pulse (10/1000µs): 6.6A minimum
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB) surface mount
• Type: Zener, Unidirectional (1 channel)
• Operating Temperature Range: -55°C to 150°C minimum

Substitute parts are grouped based on matching these parameters. Parts with identical or superior electrical ratings and the same physical package are considered direct substitutes. Compliance certifications (RoHS3, MSL 1) are maintained across all qualified substitutes.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority):

SMBJP6KE68A-TP (Micro Commercial Co) and SM6T68A (STMicroelectronics) are the primary direct substitutes for the P6SMBJ68. Both maintain the 58.1V reverse standoff voltage specification, operate across the required temperature range, and are housed in the DO-214AA (SMB) package. Both parts are active products with ROHS3 compliance and MSL 1 rating.

SMBJP6KE68A-TP provides the closest electrical match with 6.6A peak pulse current and 92V clamping voltage, supporting extended operating temperature to 175°C. SM6T68A offers higher peak pulse current capability (33A) with 121V clamping voltage, providing additional transient suppression margin.

Automotive-Grade Alternative:

SM6T68AY (STMicroelectronics) is an automotive-qualified variant (AEC-Q101) of the SM6T68A, maintaining identical electrical specifications and package configuration. This part is suitable for applications requiring automotive-grade component certification.

Non-Recommended Substitutes:

P6SMB68A (Eaton) exhibits a significantly different voltage rating (5.8V reverse standoff, 10.5V clamping) and is not suitable as a substitute for the P6SMBJ68 despite matching package and power specifications. This part is designed for different voltage protection levels and would not provide equivalent circuit protection.

Frequently Asked Questions (FAQ)

Q: Can P6SMB68A be used as a substitute for P6SMBJ68?

A: No. Although both parts share the DO-214AA (SMB) package and 600W power rating, the P6SMB68A has a reverse standoff voltage of 5.8V and clamping voltage of 10.5V, compared to the P6SMBJ68's 58.1V and 96.6V specifications. These parts are designed for different voltage protection levels and are not interchangeable.

Q: What is the difference between SM6T68A and SM6T68AY?

A: SM6T68A and SM6T68AY are electrically identical, both rated for 58.1V reverse standoff voltage, 121V clamping voltage, and 33A peak pulse current. The primary difference is that SM6T68AY carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring this certification. Both use the DO-214AA (SMB) package.

Q: Does SMBJP6KE68A-TP support higher operating temperatures than the original P6SMBJ68?

A: Yes. SMBJP6KE68A-TP is rated for -55°C to 175°C operating temperature, compared to the P6SMBJ68's -55°C to 150°C range. This provides an additional 25°C of high-temperature capability while maintaining all other electrical specifications.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts (SMBJP6KE68A-TP, SM6T68A, and SM6T68AY) are ROHS3 compliant. P6SMB68A is RoHS compliant but not specifically ROHS3 certified. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the difference in peak pulse current between substitute options?

A: SMBJP6KE68A-TP matches the original P6SMBJ68 at 6.6A peak pulse current. SM6T68A and SM6T68AY provide higher peak pulse current capability at 33A (measured at 8/20µs pulse width), offering greater transient suppression capacity. Selection depends on circuit transient current requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, all recommended substitute parts use the identical DO-214AA (SMB) surface mount package and can be placed on existing PCBs without modification. Electrical compatibility must be verified based on circuit voltage protection requirements and transient current specifications.