1SMB58CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB58CAT3 is a bidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 58V reverse standoff voltage, 93.6V maximum clamping voltage, and 600W peak pulse power rating in a DO-214AA (SMB) package. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	58	V
Voltage - Breakdown (Min)	64.4	V
Voltage - Clamping (Max) @ Ipp	93.6	V
Current - Peak Pulse (10/1000µs)	6.4	A
Power - Peak Pulse	600	W
Type	Zener	-
Bidirectional Channels	1	-
Package / Case	DO-214AA, SMB	-
Operating Temperature	-65°C ~ 150°C	TJ
Mounting Type	Surface Mount	-
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitution of the 1SMB58CAT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 58V (nominal)
Voltage - Breakdown (Min): 64.4V
Voltage - Clamping (Max) @ Ipp: 93.6V
Current - Peak Pulse (10/1000µs): 6.4A (±0.01A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Bidirectional operation (for direct equivalents)

Substitute parts are categorized as follows:

Direct Equivalents (Bidirectional, Full Parameter Match): SMBJ58CA (Good-Ark Semiconductor) maintains identical electrical specifications and bidirectional configuration.

Similar Equivalents (Unidirectional or Minor Parameter Variance): SMBJ58A (Meritek), SMBJ58A-TP (Micro Commercial Co), and SMBJ58CA-13 (Diodes Incorporated) provide equivalent voltage and power ratings but operate as unidirectional devices or have discontinued status.

Enhanced Variants (Extended Temperature or Higher Current Rating): SMBJ58CA-13-F (Diodes Incorporated), SMBJ58CA-HR (Littelfuse Inc.), and SMBJ58CA-HRA (Littelfuse Inc.) offer active product status, improved compliance, and in some cases extended operating temperature ranges or marginally higher peak pulse current (6.5A).

Parameter Comparison

Parameter	1SMB58CAT3 (onsemi)	SMBJ58CA (Good-Ark)	SMBJ58A (Meritek)	SMBJ58A-TP (MCC)	SMBJ58CA-13-F (Diodes)	SMBJ58CA-HRA (Littelfuse)
Voltage - Reverse Standoff (Typ)	58V	58V	58V	58V	58V	58V
Voltage - Breakdown (Min)	64.4V	64.4V	64.4V	64.4V	64.4V	64.4V
Voltage - Clamping (Max) @ Ipp	93.6V	93.6V	93.6V	93.6V	93.6V	93.6V
Current - Peak Pulse (10/1000µs)	6.4A	6.4A	6.41A	6.4A	6.4A	6.5A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W
Type	Zener	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1 (Unidirectional)	1 (Unidirectional)	1	1
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA (SMB)	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection - SMBJ58CA (Good-Ark Semiconductor): This part provides direct electrical and mechanical equivalence to the 1SMB58CAT3 with active product status and ROHS3 compliance. Inventory availability (21,927 pcs) supports production requirements. The -55°C lower operating temperature limit represents a 10°C reduction from the original specification; applications requiring the full -65°C minimum must select alternatives.

Alternative Selection - SMBJ58CA-13-F (Diodes Incorporated): This bidirectional equivalent offers active status, ROHS3 compliance, and extended upper operating temperature to 175°C. Inventory (38,100 pcs) provides robust supply. Suitable for applications requiring enhanced thermal performance.

Alternative Selection - SMBJ58CA-HRA (Littelfuse Inc.): This bidirectional variant maintains the original -65°C to 150°C operating range, offers ROHS3 compliance, and active product status. Peak pulse current is rated at 6.5A, providing marginal headroom. Inventory (836 pcs) is limited.

Unidirectional Alternatives - SMBJ58A-TP (Micro Commercial Co) and SMBJ58A (Meritek): These parts operate as unidirectional devices and are suitable only for applications where bidirectional protection is not required. SMBJ58A-TP extends operating temperature to 175°C.

Not Recommended - SMBJ58CA-13 (Diodes Incorporated): Product status is discontinued at DiGi Electronics; RoHS non-compliance limits new design adoption.

Frequently Asked Questions (FAQ)

Q: Can SMBJ58A (unidirectional) replace 1SMB58CAT3 (bidirectional)?

A: Only if the application circuit requires protection in a single polarity direction. The 1SMB58CAT3 provides bidirectional clamping; unidirectional substitutes will not protect against transients in the reverse direction. Verify circuit topology before selection.

Q: What is the impact of the -55°C lower operating temperature limit in SMBJ58CA?

A: The SMBJ58CA operates from -55°C to 150°C versus the original -65°C to 150°C. Applications with ambient or junction temperatures below -55°C require SMBJ58CA-HRA (Littelfuse) or SMBJ58CA-HR, which maintain the -65°C minimum.

Q: Are all substitute parts in DO-214AA (SMB) package?

A: Yes. All listed substitutes use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility without PCB redesign.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3-compliant substitutes (SMBJ58CA, SMBJ58CA-13-F, SMBJ58CA-HRA) maintain identical electrical specifications. RoHS compliance reflects manufacturing process and material composition, not functional performance.

Q: Which substitute offers the best inventory availability?

A: SMBJ58CA-13-F (Diodes Incorporated) with 38,100 pcs in stock, followed by SMBJ58CA (Good-Ark Semiconductor) with 21,927 pcs.

Q: Can I use SMBJ58CA-HRA if my design requires -65°C operation?

A: Yes. SMBJ58CA-HRA maintains the -65°C to 150°C operating range and provides bidirectional protection with active product status and ROHS3 compliance. Peak pulse current is rated at 6.5A, providing margin above the 6.4A specification.

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