1SMB22CAT3G Equivalent & Substitute Parts

Part Overview

The 1SMB22CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 16.9A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB22CAT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V
Current - Peak Pulse (10/1000µs)	16.9A
Power - Peak Pulse	600W
Bidirectional Channels	1
Type	Zener
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 1SMB22CAT3G is determined by strict electrical and mechanical parameter matching:

Critical Substitution Parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Current - Peak Pulse (10/1000µs): 16.9A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Bidirectional Channels: 1
Type: Zener

All identified substitute parts maintain identical electrical specifications across these parameters. Substitute parts are grouped by manufacturer and product status (Active), ensuring design continuity and long-term availability compared to the obsolete original part.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vwm (Typ)	Vbr (Min)	Vc (Max)	Ipp	Ppk	Package	Temp Range
1SMB22CAT3G	Littelfuse Inc.	Obsolete	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-65°C ~ 150°C
SMBJ22CA	MDD	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-50°C ~ 150°C
SMBJ22CA-HR	Littelfuse Inc.	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-65°C ~ 150°C
SMBJ22CA-HRA	Littelfuse Inc.	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-65°C ~ 150°C
TV06B220JB-G	Comchip Technology	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	Not specified
SMBJ22CA-13-F	Diodes Incorporated	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-55°C ~ 150°C
SMBJ22CA-M3/52	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-55°C ~ 150°C
SMBJ22CA-M3/5B	Vishay General Semiconductor - Diodes Division	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-55°C ~ 150°C
SMBJ22CA-TP	Micro Commercial Co	Active	22V	24.4V	35.5V	16.9A	600W	DO-214AA, SMB	-55°C ~ 175°C

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical and mechanical specifications to the 1SMB22CAT3G. Selection should be based on the following criteria:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the obsolete original part.

Compliance: All substitute parts are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.

Manufacturer Availability: Littelfuse Inc. offers SMBJ22CA-HR and SMBJ22CA-HRA as direct manufacturer-recommended alternatives with identical temperature range (-65°C ~ 150°C) to the original part. These options provide continuity with the original manufacturer.

Extended Temperature Range: SMBJ22CA-TP from Micro Commercial Co extends the upper operating temperature to 175°C, suitable for applications requiring enhanced thermal performance.

Packaging: All substitute parts are supplied in Tape & Reel (TR) packaging, standard for surface mount production environments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1SMB22CAT3G with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical electrical parameters (22V reverse standoff, 24.4V breakdown minimum, 35.5V clamping maximum, 16.9A peak pulse current, 600W peak power) and the same DO-214AA (SMB) package. Direct PCB-level substitution is electrically compatible.

Q: What is the difference between SMBJ22CA-HR and SMBJ22CA-HRA?

A: Both parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications and temperature range (-65°C ~ 150°C). The designation difference reflects internal Littelfuse product line variants. Both are functionally equivalent to the 1SMB22CAT3G.

Q: Why do some substitute parts have different temperature ranges?

A: Temperature range variations reflect manufacturer design specifications. The original 1SMB22CAT3G operates from -65°C to 150°C. Substitute parts from Littelfuse (SMBJ22CA-HR, SMBJ22CA-HRA) match this range exactly. Other manufacturers specify -55°C to 150°C or -55°C to 175°C. Selection depends on your application's thermal requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: What packaging format is available for these substitute parts?

A: All substitute parts are supplied in Tape & Reel (TR) packaging, standard for automated surface mount assembly processes.

Q: Which substitute part offers the best long-term availability?

A: Littelfuse Inc. parts (SMBJ22CA-HR and SMBJ22CA-HRA) provide manufacturer-recommended alternatives with Active product status and the same temperature range as the original obsolete part, ensuring design continuity and supply chain stability.

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