SMBJ30C Equivalent & Substitute Parts

Part Overview

The SMBJ30C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30V reverse standoff voltage with a 50.82V maximum clamping voltage and 12.4A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ30C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	31.55	V
Voltage - Clamping (Max) @ Ipp	50.82	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	600	W
Bidirectional Channels	1	—
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ30C is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 30V (exact match required)
Voltage - Clamping (Max) @ Ipp: 48.4V to 50.82V (acceptable range for protection function)
Current - Peak Pulse (10/1000µs): 12.4A minimum (equal or greater acceptable)
Power - Peak Pulse: 600W minimum (equal or greater acceptable)
Package / Case: DO-214AA, SMB (mechanical compatibility)
Bidirectional Channels: 1 (functional requirement)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: 1 (handling and storage compatibility)

All substitute parts listed maintain these core parameters within acceptable engineering tolerances for direct replacement in the same circuit application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
SMBJ30C	Littelfuse	30V	50.82V	12.4A	600W	DO-214AA, SMB	-65 to 150°C	Obsolete	ROHS3 Compliant
SMBJ30CA	MDD	30V	48.4V	12.4A	600W	DO-214AA, SMB	-50 to 150°C	Active	ROHS3 Compliant
SZ1SMB30CAT3G	Littelfuse	30V	48.4V	12.4A	600W	DO-214AA, SMB	-65 to 150°C	Active	ROHS3 Compliant
SMB8J30CA-E3/52	Vishay General Semiconductor - Diodes Division	30V	48.4V	16.5A	800W	DO-214AA, SMB	-55 to 150°C	Active	ROHS3 Compliant
SMB8J30CA-E3/5B	Vishay General Semiconductor - Diodes Division	30V	48.4V	16.5A	800W	DO-214AA, SMB	-55 to 150°C	Active	ROHS3 Compliant
SMBJ30CA-13-F	Diodes Incorporated	30V	48.4V	12.4A	600W	DO-214AA, SMB	-55 to 150°C	Active	ROHS3 Compliant
SMBJ30CA-E3/5B	Vishay General Semiconductor - Diodes Division	30V	48.4V	12.4A	600W	DO-214AA, SMB	-55 to 150°C	Active	ROHS3 Compliant
SMBJ30CA-TP	Micro Commercial Co	30V	48.4V	12.4A	600W	DO-214AA, SMB	-55 to 175°C	Active	ROHS3 Compliant
SMBJ30CA-TR	STMicroelectronics	30V	48.4V	13A	600W	DO-214AA, SMB	-55 to 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 rating, making them suitable for direct replacement of the obsolete SMBJ30C in new designs and production environments.

For applications requiring the original -65°C lower temperature limit, SZ1SMB30CAT3G from Littelfuse maintains full compatibility with the SMBJ30C operating range while offering active product status and AEC-Q101 automotive qualification.

For applications where higher peak pulse current or power dissipation capacity is beneficial, SMB8J30CA-E3/52 and SMB8J30CA-E3/5B from Vishay provide 16.5A peak pulse current and 800W power rating, exceeding the original specification while maintaining the 30V standoff voltage and 48.4V clamping voltage.

For standard general-purpose applications, SMBJ30CA from MDD, SMBJ30CA-13-F from Diodes Incorporated, SMBJ30CA-E3/5B from Vishay, SMBJ30CA-TP from Micro Commercial Co, and SMBJ30CA-TR from STMicroelectronics all provide equivalent electrical performance with active product status and widespread availability.

Frequently Asked Questions (FAQ)

Q: Can I use SMB8J30CA-E3/52 or SMB8J30CA-E3/5B as direct replacements for SMBJ30C?

A: Yes. Both parts maintain the 30V reverse standoff voltage and 48.4V clamping voltage required for circuit protection. The higher peak pulse current (16.5A vs. 12.4A) and power rating (800W vs. 600W) provide additional margin without affecting circuit function. Both are active products with ROHS3 compliance.

Q: What is the difference between SMBJ30CA variants from different manufacturers?

A: All SMBJ30CA variants (MDD, Diodes Incorporated, Vishay, Micro Commercial Co, STMicroelectronics) share identical electrical specifications: 30V standoff, 48.4V clamping, 12.4A peak pulse, and 600W power rating. Differences exist only in operating temperature ranges, packaging formats (Tape & Reel vs. Cut Tape), and manufacturer-specific certifications. Selection depends on supply chain availability and temperature requirements.

Q: Is the SMBJ30CA-TP suitable for high-temperature applications?

A: SMBJ30CA-TP from Micro Commercial Co extends the upper operating temperature to 175°C, compared to 150°C for most other variants. This makes it suitable for applications requiring higher thermal margins, while maintaining all other electrical parameters equivalent to the SMBJ30C.

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

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility with the original SMBJ30C design without PCB modifications.

Q: Does SZ1SMB30CAT3G offer any advantages over other substitutes?

A: SZ1SMB30CAT3G from Littelfuse maintains the original -65°C lower temperature limit and includes AEC-Q101 automotive qualification. It is the preferred choice for automotive applications or designs requiring the full -65 to 150°C operating range of the original SMBJ30C.

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