P6SMBJ68C Equivalent & Substitute Parts

Part Overview

The P6SMBJ68C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with a reverse standoff voltage of 58.1V and provides clamping at 96.6V with a peak pulse current rating of 6.6A. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	58.1	V
Voltage - Breakdown (Min)	61.2	V
Voltage - Clamping (Max) @ Ipp	96.6	V
Current - Peak Pulse (10/1000µs)	6.6	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P6SMBJ68C is determined by strict alignment of the following electrical and mechanical parameters:

Reverse standoff voltage: 58.1V (nominal)
Breakdown voltage minimum: 61.2V or higher
Clamping voltage maximum: within acceptable range for the application (92V to 121V)
Peak pulse current: 6.5A to 6.6A (10/1000µs waveform)
Power dissipation: 600W peak pulse
Package: DO-214AA (SMB) surface mount
Bidirectional channels: 1
Type: Zener diode
Operating temperature: -55°C minimum to 150°C or higher

The substitute parts listed below meet these criteria with active product status and current manufacturing availability.

Parameter Comparison

Parameter	P6SMBJ68C (Main)	SMBJP6KE68CA-TP	SM6T68CA-E3/52	SM6T68CA	SM6T68CAY
Manufacturer	Littelfuse	Micro Commercial Co	Vishay	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	58.1V	58.1V	58.1V	58.1V	58.1V
Voltage - Breakdown (Min)	61.2V	64.6V	64.6V	64.6V	64.6V
Voltage - Clamping (Max) @ Ipp	96.6V	92V	92V	121V	121V
Current - Peak Pulse (10/1000µs)	6.6A	6.6A	6.5A	33A (8/20µs)	33A (8/20µs)
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-55 to 150°C	-55 to 175°C	-65 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing and storage requirements. Selection among the active alternatives depends on specific application constraints:

SMBJP6KE68CA-TP (Micro Commercial Co) provides the closest electrical match to the original P6SMBJ68C, with identical reverse standoff voltage (58.1V), peak pulse current (6.6A), and clamping voltage (92V). This part extends the operating temperature range to 175°C and maintains active product status with 4077 units in stock.

SM6T68CA-E3/52 (Vishay) offers equivalent performance with 6.5A peak pulse current and 92V clamping voltage. The extended lower temperature limit (-65°C) provides additional thermal margin for demanding environments. This part is actively manufactured with 7600 units available.

SM6T68CA and SM6T68CAY (STMicroelectronics) both feature higher clamping voltage (121V) and increased peak pulse current (33A at 8/20µs waveform), suitable for applications requiring enhanced transient suppression. SM6T68CAY carries AEC-Q101 automotive qualification. Both parts maintain active status with substantial inventory availability (31797 and 162800 units respectively).

Frequently Asked Questions (FAQ)

Q: Can the P6SMBJ68C be directly replaced with any of these substitute parts?

A: Direct replacement depends on application voltage requirements. SMBJP6KE68CA-TP and SM6T68CA-E3/52 provide clamping voltage (92V) closest to the original specification (96.6V). SM6T68CA and SM6T68CAY feature higher clamping voltage (121V), which may alter circuit protection characteristics. All parts share identical reverse standoff voltage (58.1V) and package format (DO-214AA SMB).

Q: What is the difference between the 10/1000µs and 8/20µs pulse waveforms?

A: The pulse waveform specification defines the test conditions for peak pulse current rating. SMBJP6KE68CA-TP, SM6T68CA-E3/52, and the original P6SMBJ68C use 10/1000µs waveform with 6.5–6.6A ratings. SM6T68CA and SM6T68CAY use 8/20µs waveform with 33A rating. These represent different transient event profiles; selection should match the actual transient characteristics in the target application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting current environmental and manufacturing standards.

Q: Which substitute part has the widest operating temperature range?

A: SMBJP6KE68CA-TP extends to 175°C maximum junction temperature, compared to 150°C for the original P6SMBJ68C and most alternatives. SM6T68CA-E3/52 extends the lower limit to -65°C.

Q: Can I use SM6T68CAY in automotive applications?

A: SM6T68CAY carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Other parts do not carry this certification.

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