1SMB30CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB30CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage and 12.4A peak pulse current capability in the DO-214AA (SMB) package format.

The 1SMB30CAT3 is classified as obsolete. Active substitute parts with identical electrical specifications and package compatibility are available from multiple manufacturers, enabling continued system design and production support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C to 150°C	TJ
Bidirectional Channels	1	—
Type	Zener	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMB30CAT3 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V
Current - Peak Pulse (10/1000µs): 12.4A (or higher)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

All substitute parts listed maintain these core electrical specifications and physical package compatibility. Variations in operating temperature range, RoHS compliance status, and manufacturer series designation do not affect functional substitutability for this application category.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
1SMB30CAT3	onsemi	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ30CA	MDD	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-50°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-TR	STMicroelectronics	30V	33.3V	48.4V	13A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-13-F	Diodes Incorporated	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-HR	Littelfuse Inc.	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-HRA	Littelfuse	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-M3/52	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-M3/5B	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30CA-TP	Micro Commercial Co	30V	33.3V	48.4V	12.4A	600W	DO-214AA, SMB	-55°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the 1SMB30CAT3 based on electrical specifications and package compatibility. Selection among active alternatives should be based on the following criteria:

Product Status: The 1SMB30CAT3 is obsolete. All substitute parts listed carry active product status, ensuring ongoing availability and manufacturer support.

Compliance Requirements: The 1SMB30CAT3 is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Operating Temperature Range: The 1SMB30CAT3 operates from -65°C to 150°C. Substitute parts operate within -50°C to -55°C minimum and 150°C to 175°C maximum ranges. Verify application temperature requirements against specific substitute part ratings.

Peak Pulse Current: The SMBJ30CA-TR from STMicroelectronics provides 13A peak pulse current, exceeding the 12.4A specification of the original part. All other substitutes maintain the 12.4A rating.

Packaging and Tape & Reel Options: Multiple substitutes are available in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) formats to match procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ30CA-TR be used as a direct replacement for 1SMB30CAT3?

A: Yes. The SMBJ30CA-TR meets all electrical specifications with identical voltage ratings (30V standoff, 48.4V clamping) and package format (DO-214AA, SMB). The higher peak pulse current rating (13A vs. 12.4A) provides additional margin and does not affect compatibility.

Q: What is the difference between SMBJ30CA-M3/52 and SMBJ30CA-M3/5B?

A: Both parts are manufactured by Vishay and share identical electrical specifications and operating temperature range (-55°C to 150°C). The suffix designations indicate different tape and reel packaging configurations. Selection depends on procurement and assembly equipment compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, whereas the original 1SMB30CAT3 is RoHS non-compliant. This compliance status is mandatory for new designs and production in regulated markets.

Q: Does operating temperature range affect substitutability?

A: Operating temperature range does not affect electrical substitutability. However, application requirements must be verified against specific part ratings. The SMBJ30CA-TP supports the widest upper temperature limit (-55°C to 175°C), while the SMBJ30CA operates at a narrower minimum (-50°C to 150°C).

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

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and standard packaging. Verify packaging compatibility with your assembly process and procurement workflow.

Q: Can I use SMBJ30CA-HR or SMBJ30CA-HRA for high-reliability applications?

A: Both Littelfuse parts (SMBJ30CA-HR and SMBJ30CA-HRA) meet the same electrical specifications as the original part and support the full -65°C to 150°C operating temperature range. The -HR and -HRA designations indicate Littelfuse's high-reliability product lines. Selection should be based on your specific reliability and qualification requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message