SMBJ30 Equivalent & Substitute Parts

Part Overview

The SMBJ30 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) surface mount package. Designed for general-purpose transient voltage suppression applications, this component operates across a temperature range of -65°C to 150°C with a reverse standoff voltage of 30V and peak pulse power rating of 600W. The SMBJ30 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the SMBJ30 are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 30V (nominal)
Voltage breakdown minimum: 33.3V (acceptable range)
Voltage clamping maximum @ Ipp: 48.4V (within tolerance)
Current peak pulse: 12.4A minimum (higher values acceptable)
Power peak pulse: 600W minimum (higher values acceptable)
Package type: DO-214AA / SMB surface mount
Unidirectional configuration: 1 channel
Type: Zener diode

Substitute parts meeting these criteria are grouped into two categories: direct electrical equivalents with identical peak pulse current (12.4A) and enhanced performance variants with higher peak pulse current (13A or 20.7A) that provide superior transient suppression capability while maintaining backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Power Peak Pulse (W)	Operating Temp (°C)	Product Status
SMBJ30	Littelfuse Inc.	30	31.55	50.82	12.4	600	-65 ~ 150	Obsolete
SMBJ30A	MDD	30	33.3	48.4	12.4	600	-55 ~ 150	Active
SZ1SMB30AT3G	Littelfuse Inc.	30	33.3	48.4	12.4	600	-65 ~ 150	Active
SMB10J30A-E3/5B	Vishay General Semiconductor	30	33.3	48.4	20.7	1000	-55 ~ 150	Active
SMBJ30A-13-F	Diodes Incorporated	30	33.3	48.4	12.4	600	-55 ~ 150	Active
SMBJ30A-TP	Micro Commercial Co	30	33.3	48.4	12.4	600	-55 ~ 175	Active
SMBJ30A-TP-HF	Micro Commercial Co	30	33.3	48.4	12.4	600	-55 ~ 175	Active
SMBJ30A-TR	STMicroelectronics	30	33.3	48.4	13	600	-55 ~ 150	Active
SMBSAC30-TP	Micro Commercial Co	30	33.3	48.6	10	500	-55 ~ 175	Active
TV06B300J-G	Comchip Technology	30	33.3	48.4	12.4	600	-	Active

Engineering Selection Recommendations

Primary Recommendation: SZ1SMB30AT3G (Littelfuse Inc.)

The SZ1SMB30AT3G is the manufacturer-recommended successor to the obsolete SMBJ30. This part maintains identical electrical specifications while offering active product status and ROHS3 compliance. The extended operating temperature range (-65°C to 150°C) matches the original SMBJ30, ensuring thermal compatibility in existing designs. AEC-Q101 automotive qualification provides additional reliability assurance for critical applications.

Secondary Recommendations:

SMBJ30A (MDD) and SMBJ30A-13-F (Diodes Incorporated) provide direct electrical equivalence with 12.4A peak pulse current and 600W power rating. Both maintain ROHS3 compliance and active product status. The SMBJ30A-13-F offers the advantage of Diodes Incorporated's established supply chain presence.

SMB10J30A-E3/5B (Vishay General Semiconductor) represents an enhanced performance variant with 20.7A peak pulse current and 1000W power rating. This part is suitable for applications requiring higher transient suppression capability while maintaining the 30V reverse standoff voltage and DO-214AA package compatibility.

SMBJ30A-TP and SMBJ30A-TP-HF (Micro Commercial Co) extend the upper operating temperature to 175°C, providing thermal margin for high-temperature environments. Both maintain 12.4A peak pulse current and 600W power rating with ROHS3 compliance.

Not Recommended: SMBSAC30-TP

The SMBSAC30-TP is a bidirectional TVS diode, incompatible with the unidirectional SMBJ30 architecture. This part is unsuitable for direct substitution in applications requiring unidirectional transient suppression.

Frequently Asked Questions (FAQ)

Q: Can I use SMB10J30A-E3/5B as a direct replacement for SMBJ30?

A: Yes. The SMB10J30A-E3/5B maintains the 30V reverse standoff voltage, 33.3V minimum breakdown voltage, and DO-214AA package compatibility. The higher peak pulse current (20.7A) and power rating (1000W) provide enhanced performance without compromising backward compatibility. Applications designed for 12.4A operation will function correctly with this higher-rated component.

Q: What is the difference between SMBJ30A-TP and SMBJ30A-TP-HF?

A: Both parts share identical electrical specifications (30V standoff, 12.4A peak pulse, 600W power) and extended operating temperature range (-55°C to 175°C). The primary distinction is packaging designation; both are manufactured by Micro Commercial Co and maintain ROHS3 compliance. Selection between these variants should be based on supplier availability and procurement requirements.

Q: Why is SMBSAC30-TP listed as a substitute but not recommended?

A: The SMBSAC30-TP is a bidirectional TVS diode with one bidirectional channel, whereas the SMBJ30 is unidirectional with one channel. Bidirectional devices suppress transients in both polarities, while unidirectional devices suppress transients in one direction only. Application circuit polarity requirements determine whether bidirectional substitution is acceptable. Verify circuit design before selecting this variant.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range affects substitution suitability only if the application operates outside the substitute part's specified range. The SMBJ30 operates from -65°C to 150°C. Substitutes with -55°C to 150°C range are suitable for applications not exceeding -55°C. Substitutes with -55°C to 175°C range provide extended high-temperature capability. Verify application temperature requirements before final part selection.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts except TV06B300J-G carry explicit ROHS3 compliance certification. The TV06B300J-G compliance status is not specified in available documentation. For applications requiring ROHS3 compliance verification, select from SZ1SMB30AT3G, SMBJ30A-13-F, SMBJ30A-TP, SMBJ30A-TP-HF, SMBJ30A-TR, or SMB10J30A-E3/5B.

Q: Can I substitute based on package type alone?

A: No. Package type (DO-214AA / SMB) is a necessary but insufficient substitution criterion. Electrical parameters including reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current must align within specified tolerances. Verify all electrical specifications match application requirements before confirming substitution.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message