P6SMBJ22 Equivalent & Substitute Parts

Part Overview

The P6SMBJ22 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 22V nominal rating with 600W peak pulse power handling in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMBJ22
Manufacturer	Littelfuse
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	18.8V
Voltage - Breakdown (Min)	19.8V
Voltage - Clamping (Max) @ Ipp	32.13V
Current - Peak Pulse (10/1000µs)	19.9A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the P6SMBJ22 is determined by strict equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage of 18.8V and breakdown voltage minimum of 19.8V–20.9V
Package / Case: DO-214AA (SMB) surface-mount package
Power Handling: 600W peak pulse power
Unidirectional Configuration: Single-channel Zener diode topology
Clamping Voltage: Maximum clamping voltage at peak pulse current (Ipp) between 30.6V and 32.13V
Current Rating: Peak pulse current of 19.9A–102A (depending on pulse waveform specification)
Operating Temperature: Minimum operating range of -55°C to 150°C

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in the original application circuit.

Parameter Comparison

Parameter	P6SMBJ22 (Littelfuse)	SMBJP6KE22A-TP (MCC)	P6SMB22A (Eaton)	SM6T22A (STMicroelectronics)	SM6T22AY (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	18.8V	18.8V	18.8V	18.8V	18.8V
Voltage - Breakdown (Min)	19.8V	20.9V	20.9V	20.9V	20.9V
Voltage - Clamping (Max) @ Ipp	32.13V	30.6V	30.6V	30.6V	30.6V
Current - Peak Pulse (10/1000µs)	19.9A	19.9A	19.7A	102A (8/20µs)	102A (8/20µs)
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and full RoHS compliance, ensuring long-term availability and regulatory conformance. The SMBJP6KE22A-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C to 175°C), providing additional thermal margin for demanding applications. The P6SMB22A (Eaton) and SM6T22A (STMicroelectronics) maintain the original -55°C to 150°C specification. The SM6T22AY (STMicroelectronics) includes AEC-Q101 automotive qualification, suitable for automotive-grade applications requiring enhanced reliability documentation.

Clamping voltage differences are minor: the P6SMBJ22 specifies 32.13V maximum, while all active substitutes specify 30.6V maximum. This represents a 1.53V reduction in clamping voltage, which is within typical design margins for 22V-rated TVS applications. Peak pulse current specifications vary based on waveform definition (10/1000µs versus 8/20µs), but all parts deliver 600W peak pulse power handling.

Frequently Asked Questions (FAQ)

Q: Can I directly replace P6SMBJ22 with any of these substitute parts?

A: Yes. All listed parts share identical reverse standoff voltage (18.8V), package (DO-214AA/SMB), power rating (600W), and unidirectional Zener topology. Electrical performance differences are minor and within typical circuit design tolerances for transient suppression applications.

Q: What is the significance of the clamping voltage difference (32.13V vs. 30.6V)?

A: The P6SMBJ22 clamps at a maximum of 32.13V, while substitute parts clamp at 30.6V. This 1.53V difference represents improved clamping performance in the substitutes, providing slightly better overvoltage suppression. This is beneficial for circuit protection and does not create compatibility issues.

Q: Why do SM6T22A and SM6T22AY specify 102A peak pulse current instead of 19.9A?

A: Peak pulse current is defined by the waveform specification used in testing. The P6SMBJ22 uses a 10/1000µs waveform, while STMicroelectronics parts use an 8/20µs waveform. Both deliver 600W peak pulse power. The different current values reflect different test conditions, not superior or inferior performance. Both are suitable for the same 22V TVS application.

Q: Is the SM6T22AY suitable for automotive applications?

A: Yes. The SM6T22AY carries AEC-Q101 automotive qualification, making it appropriate for automotive-grade designs requiring enhanced reliability and qualification documentation. Non-automotive substitutes (P6SMB22A, SM6T22A, SMBJP6KE22A-TP) are suitable for general industrial and consumer applications.

Q: Does the extended temperature range of SMBJP6KE22A-TP (-55°C to 175°C) affect circuit compatibility?

A: No. Extended temperature range is a superset capability that does not affect compatibility. If your original design operates within -55°C to 150°C, the SMBJP6KE22A-TP will function identically. The extended range provides additional design margin for high-temperature environments.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in DO-214AA (SMB) surface-mount package. Packaging options (Cut Tape, Tape & Reel, Digi-Reel) vary by manufacturer and distributor. Verify packaging availability with your component supplier for your specific procurement requirements.

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