SMBJ22 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ22 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 22V reverse standoff voltage with a 37.28V maximum clamping voltage at peak pulse current of 16.9A, packaged in the DO-214AA (SMB) form factor. The SMBJ22 is classified as obsolete; equivalent active alternatives are available from multiple manufacturers with comparable or enhanced electrical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	23.09	V
Voltage - Clamping (Max) @ Ipp	37.28	V
Current - Peak Pulse (10/1000µs)	16.9	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMBJ22 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 22V
Voltage - Clamping (Max) @ Ipp: Acceptable range 35.5V to 37.28V
Current - Peak Pulse (10/1000µs): Minimum 16.9A (higher values acceptable)
Package / Case: DO-214AA (SMB) form factor required
Mounting Type: Surface Mount
Type: Zener diode, unidirectional configuration
RoHS Compliance: ROHS3 Compliant

Substitute parts meeting these criteria are functionally equivalent for general-purpose transient voltage suppression applications. Variations in clamping voltage within the specified range and peak pulse current above the minimum threshold do not affect circuit compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Package
SMBJ22	Littelfuse Inc.	22	23.09	37.28	16.9	600	-65 to 150	Obsolete	DO-214AA (SMB)
SMBJ22A	Meritek	22	24.4	35.5	16.9	600	-55 to 150	Active	DO-214AA (SMB)
SZ1SMB22AT3G	onsemi	22	24.4	35.5	16.9	600	-65 to 150	Active	DO-214AA (SMB)
SMB10J22A-E3/52	Vishay General Semiconductor - Diodes Division	22	24.4	35.5	28.2	1000	-55 to 150	Active	DO-214AA (SMB)
SMB10J22A-E3/5B	Vishay General Semiconductor - Diodes Division	22	24.4	35.5	28.2	1000	-55 to 150	Active	DO-214AA (SMB)
SMBJ22A-13-F	Diodes Incorporated	22	24.4	35.5	16.9	600	-55 to 150	Active	DO-214AA (SMB)
SMBJ22A-E3/52	Vishay General Semiconductor - Diodes Division	22	24.4	35.5	16.9	600	-55 to 150	Active	DO-214AA (SMB)
SMBJ22A-E3/5B	Vishay General Semiconductor - Diodes Division	22	24.4	35.5	16.9	600	-55 to 150	Active	DO-214AA (SMB)
SMBJ22A-TP	Micro Commercial Co	22	24.4	35.5	16.9	600	-55 to 175	Active	DO-214AA (SMB)

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, addressing the obsolescence of the SMBJ22. Selection among equivalents should be based on the following criteria:

Direct Electrical Equivalents (16.9A Peak Pulse Current): SMBJ22A (Meritek), SMBJ22A-13-F (Diodes Incorporated), SMBJ22A-E3/52 (Vishay), SMBJ22A-E3/5B (Vishay), and SMBJ22A-TP (Micro Commercial Co) provide identical peak pulse current ratings and power dissipation to the original SMBJ22. These are suitable for direct replacement in existing designs.

Enhanced Performance Alternatives (28.2A Peak Pulse Current): SMB10J22A-E3/52 and SMB10J22A-E3/5B (Vishay TransZorb® series) offer higher peak pulse current (28.2A) and increased power dissipation (1000W), providing additional margin for transient suppression. These are compatible substitutes for applications requiring enhanced surge protection capability.

Temperature Range Consideration: SZ1SMB22AT3G (onsemi) maintains the original -65°C to 150°C operating range and includes AEC-Q101 automotive qualification. SMBJ22A-TP (Micro Commercial Co) extends the upper temperature limit to 175°C, suitable for high-temperature environments.

Packaging and Availability: All substitutes are available in tape and reel or cut tape configurations. Verify packaging requirements (bulk, tape & reel, cut tape) against procurement specifications.

Frequently Asked Questions (FAQ)

Q: Can I use SMB10J22A-E3/52 or SMB10J22A-E3/5B as direct replacements for SMBJ22?

A: Yes. Both parts meet the critical substitution parameters: 22V reverse standoff voltage, 35.5V clamping voltage, and DO-214AA (SMB) package. The higher peak pulse current (28.2A vs. 16.9A) and increased power rating (1000W vs. 600W) provide additional protection margin and are fully compatible with SMBJ22 circuit designs.

Q: What is the difference between SMBJ22A and SMBJ22A-TP?

A: Both parts share identical electrical characteristics (22V standoff, 35.5V clamping, 16.9A peak pulse). SMBJ22A-TP extends the maximum operating temperature to 175°C compared to 150°C for standard SMBJ22A, making it suitable for high-temperature applications.

Q: Is the SZ1SMB22AT3G suitable for automotive applications?

A: Yes. SZ1SMB22AT3G carries AEC-Q101 automotive qualification and maintains the original -65°C to 150°C temperature range, making it appropriate for automotive transient voltage suppression circuits.

Q: Do all substitute parts have the same clamping voltage as the original SMBJ22?

A: No. The original SMBJ22 specifies 37.28V maximum clamping voltage, while all active substitutes specify 35.5V maximum clamping voltage. This 1.78V difference is within acceptable tolerance for general-purpose overvoltage protection and does not affect circuit compatibility.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are available in multiple packaging configurations: bulk, tape & reel (TR), and cut tape (CT) with Digi-Reel®. Verify the specific packaging code suffix (e.g., -E3/52, -E3/5B, -TP) against your procurement requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original SMBJ22.

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