SMBJ350 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ350 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 350V reverse standoff voltage rating with a 595.35V maximum clamping voltage and 1.1A peak pulse current capability in a surface-mount DO-214AA (SMB) package. The SMBJ350 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Multiple active alternatives from qualified manufacturers provide compatible electrical and mechanical specifications suitable for direct replacement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	350	V
Voltage - Breakdown (Min)	370.35	V
Voltage - Clamping (Max) @ Ipp	595.35	V
Current - Peak Pulse (10/1000µs)	1.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA (SMB)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ350 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 350V (all substitutes match)
Voltage - Clamping (Max) @ Ipp: Maximum 595.35V (substitutes range 567V, within acceptable tolerance)
Current - Peak Pulse (10/1000µs): 1.1A nominal (substitutes provide 1.06A to 1.1A)
Power - Peak Pulse: 600W (all substitutes match)
Package / Case: DO-214AA (SMB) surface mount (all substitutes match)
Type: Zener unidirectional (all substitutes match)
RoHS & MSL Compliance: ROHS3 Compliant, MSL 1 (all substitutes match)

All identified substitute parts maintain electrical compatibility within the specified parameter ranges and share identical mechanical packaging, enabling direct board-level replacement without design modification.

Parameter Comparison

Parameter	SMBJ350 (Littelfuse)	SMBJ350A (Meritek)	SMBJ350A-13-F (Diodes Inc.)	SMBJ350A-TP (MCC)	TV06B351J-HF (Comchip)
Voltage - Reverse Standoff (Typ)	350V	350V	350V	350V	350V
Voltage - Breakdown (Min)	370.35V	391V	391V	391V	391V
Voltage - Clamping (Max) @ Ipp	595.35V	567V	567V	567V	567V
Current - Peak Pulse (10/1000µs)	1.1A	1.06A	1.1A	1.1A	1.06A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 175°C	Not specified
Package / Case	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs)

SMBJ350A-13-F (Diodes Incorporated) and SMBJ350A-TP (Micro Commercial Co) are the preferred alternatives. Both maintain active product status, provide full ROHS3 compliance documentation, and deliver the specified 1.1A peak pulse current. SMBJ350A-13-F offers Tape & Reel packaging suitable for automated assembly, while SMBJ350A-TP supports extended operating temperature to 175°C for thermally demanding applications.

Secondary Substitutes (Inventory Availability)

SMBJ350A (Meritek) and TV06B351J-HF (Comchip Technology) provide equivalent protection characteristics with active product status and full compliance certifications. Both deliver 1.06A peak pulse current, which remains within acceptable operating margins for general-purpose transient suppression. SMBJ350A offers the highest inventory availability (30,400 units), while TV06B351J-HF provides an alternative sourcing option with Comchip Technology manufacturing.

Compliance Considerations

All active substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard PCB assembly and storage protocols. Selection should prioritize parts with documented REACH status confirmation for supply chain compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ350A-13-F directly replace SMBJ350 without PCB modification?

A: Yes. SMBJ350A-13-F maintains identical DO-214AA (SMB) package geometry, pinout, and electrical specifications within the defined parameter ranges. No PCB layout changes are required.

Q: What is the difference between the 595.35V and 567V clamping voltages?

A: Both values represent maximum clamping voltage at peak pulse current (Ipp). The 567V specification in substitute parts is within acceptable tolerance for the 350V standoff voltage class and maintains equivalent overvoltage protection performance for general-purpose applications.

Q: Are there packaging differences between substitute options?

A: SMBJ350A-13-F is supplied in Tape & Reel (TR) format for automated pick-and-place assembly. SMBJ350A-TP is supplied in Bulk packaging. TV06B351J-HF and SMBJ350A are supplied in Tape & Reel. All share identical DO-214AA (SMB) component geometry.

Q: Which substitute offers the widest operating temperature range?

A: SMBJ350A-TP (Micro Commercial Co) supports -55 to 175°C, extending 25°C above the original SMBJ350 specification. This option is suitable for high-temperature environments where thermal margin is critical.

Q: Is REACH compliance documentation available for all substitutes?

A: SMBJ350A-13-F, SMBJ350A-TP, TV06B351J-HF, and SMBJ350A all carry REACH Unaffected or REACH Compliant status. Verify current compliance documentation with the respective manufacturer for supply chain requirements.

Q: What is the minimum order quantity for substitute parts?

A: Minimum order quantities vary by manufacturer and distributor. SMBJ350A (Meritek) offers the highest inventory availability at 30,400 units. Consult your component supplier for specific MOQ and lead time information.

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