1SMB33CAT3G Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The 1SMB33CAT3G is a 33V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 53.3V maximum clamping voltage, 11.3A peak pulse current capability, and 600W peak pulse power dissipation in a DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage – Reverse Standoff (Typ)	33	V
Voltage – Breakdown (Min)	36.7	V
Voltage – Clamping (Max) @ Ipp	53.3	V
Current – Peak Pulse (10/1000µs)	11.3	A
Power – Peak Pulse	600	W
Package / Case	DO-214AA, SMB	–
Mounting Type	Surface Mount	–
Operating Temperature	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	–
Moisture Sensitivity Level (MSL)	1 (Unlimited)	–

Substitute Part Grouping Explanation

Substitution of the 1SMB33CAT3G is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage – Reverse Standoff: 33V (nominal)
Voltage – Breakdown (Min): 36.7V
Voltage – Clamping (Max) @ Ipp: 53.3V
Current – Peak Pulse (10/1000µs): 11.3A minimum
Power – Peak Pulse: 600W minimum
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (11.3A Peak Pulse) Parts meeting all electrical specifications with 11.3A peak pulse current and 600W power dissipation. These provide one-to-one functional replacement.

Category 2: Enhanced Performance Alternatives (15A Peak Pulse) Parts exceeding the original specification with 15A peak pulse current and 800W power dissipation. These provide superior transient protection capability while maintaining all voltage parameters and package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Voltage – Reverse Standoff (V)	Voltage – Breakdown Min (V)	Voltage – Clamping Max @ Ipp (V)	Current – Peak Pulse (A)	Power – Peak Pulse (W)	Operating Temperature (°C)	Package
1SMB33CAT3G	Littelfuse	Obsolete	33	36.7	53.3	11.3	600	-65 to 150	DO-214AA, SMB
SMBJ33CA	MDD	Active	33	36.7	53.3	11.3	600	-50 to 150	DO-214AA, SMB
SMBJ33CA-HR	Littelfuse Inc.	Active	33	36.7	53.3	11.3	600	-65 to 150	DO-214AA, SMB
SMBJ33CA-HRA	Littelfuse Inc.	Active	33	36.7	53.3	11.3	600	-65 to 150	DO-214AA, SMB
TV06B330JB-G	Comchip Technology	Active	33	36.7	53.3	11.26	600	Not specified	DO-214AA, SMB
SMB8J33CA-M3/52	Vishay General Semiconductor – Diodes Division	Active	33	36.7	53.3	15	800	-55 to 150	DO-214AA, SMB
SMB8J33CA-M3/5B	Vishay General Semiconductor – Diodes Division	Active	33	36.7	53.3	15	800	-55 to 150	DO-214AA, SMB
SMBJ33CA-13-F	Diodes Incorporated	Active	33	36.7	53.3	11.3	600	-55 to 150	DO-214AA, SMB
SMBJ33CA-M3/52	Vishay General Semiconductor – Diodes Division	Active	33	36.7	53.3	11.3	600	-55 to 150	DO-214AA, SMB

Engineering Selection Recommendations

All identified substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

For Direct Replacement (Equivalent Performance): SMBJ33CA-HR and SMBJ33CA-HRA from Littelfuse Inc. are active products with identical electrical specifications and operating temperature range (-65°C to 150°C) matching the original 1SMB33CAT3G. These are preferred for applications requiring no performance deviation.

SMBJ33CA from MDD provides electrical equivalence with a reduced lower operating temperature limit (-50°C instead of -65°C). Selection depends on application temperature requirements.

SMBJ33CA-13-F from Diodes Incorporated and SMBJ33CA-M3/52 from Vishay provide electrical equivalence with operating temperature range of -55°C to 150°C, suitable for most general-purpose applications.

TV06B330JB-G from Comchip Technology meets electrical specifications with peak pulse current of 11.26A, within tolerance of the 11.3A specification.

For Enhanced Protection (Superior Performance): SMB8J33CA-M3/52 and SMB8J33CA-M3/5B from Vishay General Semiconductor – Diodes Division exceed the original specification with 15A peak pulse current and 800W power dissipation, providing increased transient protection margin. Operating temperature range is -55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher peak pulse current (15A) in place of the original 11.3A specification?

A: Yes. Parts with 15A peak pulse current and 800W power dissipation (SMB8J33CA-M3/52 and SMB8J33CA-M3/5B) maintain all voltage parameters and package compatibility. They provide enhanced transient protection capability and are electrically compatible with circuits designed for the 1SMB33CAT3G.

Q: What is the significance of the operating temperature range difference between substitute parts?

A: The original 1SMB33CAT3G operates from -65°C to 150°C. Substitute parts with -50°C or -55°C lower limits are suitable for applications not requiring full -65°C operation. Selection depends on the specific application's minimum operating temperature requirement.

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

A: Yes. All identified substitute parts use the DO-214AA or SMB package designation, ensuring mechanical and footprint compatibility with the original design.

Q: Do all substitute parts meet RoHS and MSL requirements?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) rating, meeting standard manufacturing and environmental compliance requirements.

Q: What is the difference between Littelfuse SMBJ33CA-HR and SMBJ33CA-HRA?

A: Both parts are Littelfuse active products with identical electrical specifications and operating temperature range. The designation difference reflects internal product line categorization. Both are suitable direct replacements for the 1SMB33CAT3G.

Q: Can I substitute the 1SMB33CAT3G with SMBJ33CA from MDD in a -65°C application?

A: No. SMBJ33CA from MDD has a lower operating temperature limit of -50°C. For applications requiring -65°C operation, use SMBJ33CA-HR, SMBJ33CA-HRA from Littelfuse, or alternatives with -55°C or lower limits.

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