1SMB22CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB22CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, 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 the DO-214AA (SMB) package format. The part is currently classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB22CAT3
Manufacturer	onsemi
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
Operating Temperature Range	-65°C ~ 150°C (TJ)
Product Status	Obsolete
Type	Zener
Bidirectional Channels	1
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 1SMB22CAT3 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

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

All identified substitute parts maintain these core electrical specifications. Substitute parts are classified into two categories:

Direct Manufacturer Substitutes (SMBJ22CA by MDD): Identical electrical and mechanical specifications with active product status and RoHS3 compliance.

Similar Manufacturer Substitutes: Parts from Diodes Incorporated, Littelfuse Inc., Vishay General Semiconductor, Micro Commercial Co, and STMicroelectronics that maintain all critical electrical parameters within the specified ranges while offering active product status and modern compliance certifications.

Parameter Comparison

Parameter	1SMB22CAT3 (onsemi)	SMBJ22CA (MDD)	SMBJ22CA-13-F (Diodes Inc.)	SMBJ22CA-HR (Littelfuse)	SMBJ22CA-HRA (Littelfuse)	SMBJ22CA-M3/5B (Vishay)	SMBJ22CA-TP (MCC)	SMBJ22CA-TR (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	22V	22V	22V	22V	22V	22V	22V	22V
Voltage - Breakdown (Min)	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V
Current - Peak Pulse (10/1000µs)	16.9A	16.9A	16.9A	16.9A	16.9A	16.9A	16.9A	17.7A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W	600W
Operating Temperature Range	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

All identified substitute parts maintain electrical equivalence to the 1SMB22CAT3 within the specified parameter tolerances. Selection should prioritize active product status and compliance certifications:

Primary Selection: SMBJ22CA (MDD) offers direct electrical equivalence with active product status and RoHS3 compliance. Inventory availability is substantial at 25,400 pieces.

Secondary Selections: SMBJ22CA-13-F (Diodes Incorporated), SMBJ22CA-HR (Littelfuse), SMBJ22CA-HRA (Littelfuse), SMBJ22CA-M3/5B (Vishay), SMBJ22CA-TP (Micro Commercial Co), and SMBJ22CA-TR (STMicroelectronics) all maintain full electrical specification compliance with RoHS3 certification and active product status.

Temperature Consideration: SMBJ22CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to 150°C for other alternatives. SMBJ22CA-HR and SMBJ22CA-HRA maintain the original -65°C lower temperature limit.

Peak Pulse Current: SMBJ22CA-TR (STMicroelectronics) specifies 17.7A peak pulse current, exceeding the 16.9A minimum requirement, providing additional margin.

All substitute parts are RoHS3 compliant, addressing the non-compliance status of the obsolete 1SMB22CAT3.

Frequently Asked Questions (FAQ)

Q: Can SMBJ22CA-TR be used as a direct replacement despite the higher peak pulse current specification?

A: Yes. The 17.7A specification exceeds the 16.9A requirement, maintaining full compatibility. Higher peak pulse current capability does not compromise circuit function in applications designed for 16.9A operation.

Q: What is the significance of the operating temperature range differences?

A: All substitute parts maintain the critical 150°C upper temperature limit of the original part. SMBJ22CA-TP extends to 175°C, providing additional thermal margin. SMBJ22CA-HR and SMBJ22CA-HRA match the original -65°C lower limit. Temperature range selection depends on application requirements.

Q: Are all substitute parts available in the same DO-214AA SMB package?

A: Yes. All identified substitutes use the DO-214AA (SMB) package format, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Why is RoHS3 compliance important for this substitution?

A: The original 1SMB22CAT3 is RoHS non-compliant. All active substitute parts are RoHS3 compliant, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: Yes. All substitute parts maintain identical critical electrical parameters (22V standoff, 24.4V breakdown minimum, 35.5V clamping maximum, 600W peak pulse power) and the same DO-214AA SMB package. Interchangeability is confirmed at the electrical and mechanical level.

Q: What inventory considerations should guide part selection?

A: SMBJ22CA (MDD) offers the highest inventory availability at 25,400 pieces. SMBJ22CA-TP (MCC) provides 4,256 pieces. Other alternatives range from 710 to 1,106 pieces. Procurement strategy should align with supply chain requirements and lead time constraints.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message