1SMB64CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB64CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 64V reverse standoff voltage with a 103V clamping voltage at peak pulse current of 5.8A, housed in a DO-214AA (SMB) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	64	V
Voltage - Breakdown (Min)	71.1	V
Voltage - Clamping (Max) @ Ipp	103	V
Current - Peak Pulse (10/1000µs)	5.8	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature	-65 to 150	°C
Bidirectional Channels	1	—
Type	Zener	—

Substitute Part Grouping Explanation

Substitution for the 1SMB64CAT3 is determined by strict alignment of electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 64V
Voltage - Clamping (Max) @ Ipp: 103V
Current - Peak Pulse (10/1000µs): 5.8A (±0.1A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Bidirectional Channels: 1
Type: Zener

Direct Equivalents maintain all electrical parameters within specification and are manufactured by different suppliers with active product status.

Similar Parts share the same voltage and clamping characteristics but may have minor variations in peak pulse current (5.8A to 5.9A range) or operating temperature ranges. These remain functionally compatible for the specified application.

Parameter Comparison

Part Number	Manufacturer	Vr Standoff (V)	V Breakdown Min (V)	V Clamp Max @ Ipp (V)	Ipp (A)	Power Peak (W)	Package	Status	RoHS
1SMB64CAT3	onsemi	64	71.1	103	5.8	600	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ64CA	Meritek	64	71.1	103	5.83	600	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ64CA-13-F	Diodes Incorporated	64	71.1	103	5.8	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ64CA-HR	Littelfuse Inc.	64	71.1	103	5.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ64CA-HRA	Littelfuse Inc.	64	71.1	103	5.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ64CA-M3/52	Vishay General Semiconductor	64	71.7	103	5.8	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ64CA-M3/5B	Vishay General Semiconductor	64	71.7	103	5.8	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ58CE3/TR13	Microchip Technology	58	64.4	103	5.8	600	DO-214AA, SMB	Active	ROHS3 Compliant
1SMB5948BT3G	onsemi	—	—	—	—	3	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Choices):

SMBJ64CA (Meritek), SMBJ64CA-13-F (Diodes Incorporated), SMBJ64CA-HR (Littelfuse Inc.), and SMBJ64CA-HRA (Littelfuse Inc.) are direct functional equivalents with identical voltage specifications (64V standoff, 103V clamp) and peak pulse current within acceptable tolerance. All are active products with ROHS3 compliance, providing long-term availability and regulatory alignment. These parts are interchangeable in the 1SMB64CAT3 application without circuit modification.

Alternative Equivalents (Secondary Choices):

SMBJ64CA-M3/52 and SMBJ64CA-M3/5B (Vishay TransZorb® series) maintain identical electrical performance with slightly higher breakdown voltage (71.7V vs. 71.1V), remaining within acceptable operating margins. Both are active with ROHS3 compliance and offer extended temperature range support (-55°C to 150°C).

Limited Compatibility:

SMBJ58CE3/TR13 (Microchip Technology) has a lower reverse standoff voltage (58V vs. 64V) and breakdown voltage (64.4V vs. 71.1V). This part is suitable only for applications where the lower voltage threshold is acceptable and does not compromise circuit protection requirements.

Not Recommended:

1SMB5948BT3G (onsemi) is a zener diode with significantly different electrical characteristics (91V nominal, 3W power rating) and is not functionally equivalent to the 1SMB64CAT3 TVS diode.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ64CA as a direct replacement for 1SMB64CAT3?

A: Yes. SMBJ64CA maintains identical voltage specifications (64V standoff, 103V clamp) and peak pulse current (5.83A), with the same DO-214AA (SMB) package. The part is active with ROHS3 compliance, making it a direct functional equivalent.

Q: What is the difference between SMBJ64CA-HR and SMBJ64CA-HRA?

A: Both parts are from Littelfuse's SMBJ-HR and SMBJ-HRA series with identical electrical specifications. The suffix designates different product lines within Littelfuse's portfolio. Both are functionally equivalent to the 1SMB64CAT3 and interchangeable in circuit design.

Q: Why is SMBJ58CE3/TR13 listed as a substitute if it has lower voltage?

A: SMBJ58CE3/TR13 is classified as a similar part due to matching clamping voltage (103V) and peak pulse current (5.8A). However, the lower standoff voltage (58V vs. 64V) means it activates at a lower threshold. This part is suitable only for applications where the reduced voltage margin is acceptable.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and thermal compatibility with the original 1SMB64CAT3 footprint.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. The original 1SMB64CAT3 is RoHS non-compliant. Selecting ROHS3-compliant substitutes ensures regulatory alignment for new designs and manufacturing processes.

Q: Can I use Vishay TransZorb® parts as replacements?

A: Yes. SMBJ64CA-M3/52 and SMBJ64CA-M3/5B maintain identical voltage and current specifications with slightly higher breakdown voltage (71.7V). Both are active, ROHS3-compliant, and functionally equivalent for the 1SMB64CAT3 application.

Q: Is the 1SMB5948BT3G a suitable alternative?

A: No. The 1SMB5948BT3G is a zener diode with 91V nominal voltage and 3W power rating, fundamentally different from the 1SMB64CAT3 TVS diode specifications. It is not functionally equivalent and should not be used as a replacement.

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